Nickel Grades 200/201/270

1. Industry Context of Nickel Fasteners

Commercially pure nickel fasteners occupy a specialized category within industrial fastening systems. While stainless steels dominate general industrial applications, nickel fasteners are selected when service conditions demand:

  • Exceptional resistance to caustic environments
  • High purity process compatibility
  • Resistance to reducing chemicals
  • Electrical conductivity
  • Thermal conductivity
  • High-temperature oxidation resistance
  • Magnetic property control
  • Long-term corrosion resistance

Industries frequently specifying Nickel 200/201/270 fasteners include:

IndustryPrimary Requirement
Chemical ProcessingCaustic resistance
PetrochemicalCorrosion protection
Offshore PlatformsMarine durability
Power PlantsThermal stability
Electronics ManufacturingConductivity
Aerospace Support EquipmentEnvironmental resistance
Food ProcessingProduct purity
Pharmaceutical PlantsContamination prevention
LNG FacilitiesCorrosion reliability
Desalination PlantsSeawater exposure resistance

2. Technical Definition of Nickel Grades 200, 201 & 270

These materials belong to commercially pure wrought nickel alloys.

Nickel 200

UNS N02200

Contains approximately:

ElementContent (%)
Nickel99.0 min
Carbon0.15 max
Iron0.40 max
Copper0.25 max
Manganese0.35 max
Silicon0.35 max

Characteristics:

  • Excellent corrosion resistance
  • Good thermal conductivity
  • High electrical conductivity
  • Good mechanical strength
  • Suitable up to approximately 315°C

Nickel 201

UNS N02201

Low-carbon version of Nickel 200.

ElementContent (%)
Nickel99.0 min
Carbon0.02 max

Advantages:

  • Prevents graphitization
  • Better high-temperature stability
  • Improved resistance above 315°C
  • Preferred for elevated temperature process equipment

Nickel 270

UNS N02270

High-purity nickel grade.

ElementContent (%)
Nickel99.97 min
Carbon0.01 max
SulfurVery Low
Other ImpuritiesExtremely Low

Characteristics:

  • Exceptional electrical conductivity
  • Superior magnetic properties
  • Electronics and instrumentation applications
  • High-purity industrial environments

3. Functional Role of Nickel Fasteners

Nickel fasteners perform the same mechanical fastening function as conventional bolts and screws but provide additional benefits:

Mechanical Function

  • Clamp components together
  • Transfer tensile loads
  • Resist vibration loosening
  • Maintain joint integrity

Environmental Function

  • Resist chemical attack
  • Maintain dimensional stability
  • Prevent contamination
  • Resist oxidation

Reliability Function

  • Long service life
  • Reduced maintenance
  • Reduced replacement frequency
  • Lower lifecycle cost

4. Load Mechanics in Nickel Fastened Joints

Understanding load transfer is critical for EPC engineering and maintenance applications.

Tensile Loading

When a bolt is tightened:

  1. Bolt stretches elastically
  2. Joint compresses
  3. Clamping force develops

The clamping force must exceed service loads.

Tensile Stress Formula

σ=FA\sigma=\frac{F}{A}

Where:

  • σ = tensile stress
  • F = applied load
  • A = stress area

Shear Loading

Occurs when connected members slide relative to each other.

Common in:

  • Structural assemblies
  • Pipe supports
  • Equipment bases
  • Offshore modules

Combined Loading

Industrial joints frequently experience:

  • Tension
  • Shear
  • Bending
  • Thermal loading
  • Cyclic fatigue

Nickel fasteners are often selected where corrosion and temperature effects combine with mechanical loads.

5. Preload and Clamping Force Principles

Preload is the most important factor governing fastener performance.

Benefits of Proper Preload

  • Prevents joint separation
  • Reduces fatigue failure
  • Minimizes vibration loosening
  • Improves sealing performance

Preload Formula

Fp=0.75×As×SyF_p=0.75\times A_s\times S_y

Where:

  • Fp = preload
  • As = stress area
  • Sy = yield strength

Worked Example

M16 Nickel 200 Bolt

Assumptions:

  • Stress Area = 157 mm²
  • Yield Strength = 148 MPa

Preload:

Fp = 0.75 × 157 × 148

Fp = 17,427 N

Approximate preload:

17.4 kN

6. Torque–Tension Relationship

Applied torque creates bolt preload.

Approximate relation:

T=KFDT=KFD

Where:

  • T = Torque
  • K = Nut Factor
  • F = Preload
  • D = Nominal Diameter

Typical Nut Factors:

ConditionK Value
Dry0.20–0.25
Zinc Lubricated0.15–0.18
PTFE Coated0.10–0.14
Moly Lubricated0.12–0.16

7. Friction Effects

Nearly 90% of tightening torque is consumed by friction.

Torque DistributionApproximate Share
Thread Friction40%
Bearing Surface Friction50%
Useful Bolt Stretch10%

Therefore lubrication condition must always be specified during installation.

8. Thread Engagement Principles

Minimum thread engagement depends upon:

  • Material strength
  • Bolt diameter
  • Joint design
  • Load requirement

Typical recommendation:

MaterialEngagement
Nickel-to-Nickel1.5D
Nickel-to-Steel1.0D
High Load Joints2.0D

(D = Nominal Diameter)

9. Failure Mechanisms in Nickel Fasteners

Fatigue Failure

Caused by:

  • Cyclic loading
  • Insufficient preload
  • Vibration

Indicators:

  • Progressive crack growth
  • Beach marks
  • Sudden fracture

Shear Failure

Occurs when transverse loads exceed capacity.

Common in:

  • Structural joints
  • Equipment mounts
  • Pipe supports

Galling

Important consideration for pure nickel fasteners.

Causes:

  • Similar mating materials
  • High contact pressure
  • Insufficient lubrication

Mitigation:

  • Anti-seize compounds
  • Surface coatings
  • Controlled torque application

Stress Corrosion Cracking

Nickel grades generally exhibit excellent SCC resistance compared to many stainless steels.

Hydrogen Embrittlement

Commercially pure nickel is less susceptible than high-strength alloy steels.

This makes Nickel 200/201 suitable for corrosive service where embrittlement concerns exist.

10. Joint Design Considerations

Engineering design should consider:

Environmental Factors

  • Chlorides
  • Acids
  • Caustics
  • Temperature
  • Humidity

Mechanical Factors

  • Static load
  • Dynamic load
  • Fatigue cycles
  • Shock loading

Maintenance Factors

  • Accessibility
  • Inspection frequency
  • Replacement strategy

Reliability Factors

  • Required service life
  • Consequence of failure
  • Redundancy requirements

11. Selection Criteria for Nickel Fasteners

ParameterNickel 200Nickel 201Nickel 270
Corrosion ResistanceExcellentExcellentExcellent
High Temperature UseGoodSuperiorModerate
ConductivityHighHighVery High
PurityHighHighExtremely High
CostMediumMediumHighest
Mechanical StrengthModerateModerateLower
Typical ApplicationChemical PlantsHeat ProcessingElectronics

12. Product Types and Variants of Nickel 200/201/270 Fasteners

Commercially pure nickel fasteners are manufactured in a wide range of configurations to satisfy structural, mechanical, process equipment, electrical, and corrosive-service requirements.

Selection of the correct fastener geometry is critical because load distribution, installation method, fatigue resistance, and maintenance accessibility are directly influenced by fastener design.

13. Nickel Hex Head Bolts

Hex head bolts are the most widely specified nickel fastener type for industrial assemblies.

Key Characteristics

  • Six-sided external drive
  • High torque transmission capability
  • Suitable for heavy-duty service
  • Easy field installation
  • Compatible with standard tooling

Typical Applications

  • Chemical processing equipment
  • Heat exchangers
  • Pressure vessels
  • Offshore skids
  • Structural steel supports
  • Pump assemblies

Applicable Standards

StandardDescription
ISO 4014Hex bolts, partial thread
ISO 4017Hex bolts, full thread
DIN 931Hex bolt, partial thread
DIN 933Hex bolt, full thread
ASTM F468Nonferrous bolt specification
BS 3692Metric fasteners

14. Nickel Hex Nuts

Hex nuts provide mating thread engagement for externally threaded fasteners.

Functions

  • Maintain preload
  • Resist loosening
  • Facilitate assembly disassembly

Common Types

Nut TypeApplication
HEX NUTGeneral industrial use
Heavy Hex NutStructural joints
Jam NutLocking applications
Slotted NutCotter pin retention
Lock NutVibration resistance

Standards

StandardDescription
ISO 4032Hex nuts
DIN 934Standard hex nuts
ASTM F467Nonferrous nuts
BS 3692Metric nuts

15. Nickel Threaded Rods

Threaded rods provide continuous thread engagement over the entire length.

Advantages

  • Adjustable positioning
  • Long-span support capability
  • Suitable for elevated temperature service
  • Easy customization

Typical Applications

  • Pipe supports
  • Equipment anchoring
  • Structural bracing
  • Chemical processing systems
  • Instrumentation mounting

Standards

StandardDescription
DIN 975Full-thread rod
DIN 976Stud bolt
ASTM F468Nickel threaded rod material requirements

16. Nickel Stud Bolts

Stud bolts are widely used in pressure-containing flanged joints.

Configurations

Fully Threaded Stud

Threads throughout the length.

Tap-End Stud Bolt

One end permanently installed.

DOUBLE END STUD

Threaded ends with plain center section.

Typical Industries

  • Refinery piping
  • Petrochemical units
  • Offshore platforms
  • LNG facilities
  • Heat exchanger systems

17. Nickel Socket Head Cap Screws

Socket head screws are selected when installation space is restricted.

Features

  • Internal hex drive
  • High clamp load capability
  • Compact head geometry
  • Precise alignment

Standards

StandardDescription
ISO 4762Socket head cap screw
DIN 912Socket screw
BS 4168Socket screws

18. Nickel Machine Screws

Machine screws are used in light-duty precision assemblies.

Applications

  • Instrumentation
  • Electrical enclosures
  • Control panels
  • Analytical equipment
  • Electronic systems

Head Styles

  • Pan head
  • Flat head
  • Countersunk head
  • Cheese head
  • Round head

19. Nickel Washers

Washers distribute bearing pressure and protect mating surfaces.

Flat Washers

Used for load distribution.

Spring Washers

Provide vibration resistance.

Fender Washers

Large outside diameter.

Spherical Washers

Compensate for misalignment.

Standards

StandardDescription
ISO 7089Plain washer
ISO 7090Chamfered washer
DIN 125Flat washer
DIN 127Spring washer
BS 4320Metric washer

20. Nickel U-Bolts

Designed for pipe retention and support systems.

Applications

  • Pipe racks
  • Offshore piping
  • Chemical plants
  • Marine systems
  • Instrument supports

Advantages

  • Uniform load distribution
  • Corrosion resistance
  • Easy maintenance

21. Nickel Eye Bolts

Provide lifting and rigging attachment points.

Industrial Uses

  • Heat exchangers
  • Process vessels
  • Pumps
  • Compressors
  • Skid-mounted equipment

Relevant Standards

StandardDescription
DIN 580Eye bolts
BS 4278Lifting eye bolts

22. Nickel Custom Engineered Fasteners

SM Fasteners manufactures custom nickel fasteners for EPC and OEM projects.

Capabilities include:

  • Special thread forms
  • Non-standard diameters
  • Extended lengths
  • Precision-machined components
  • Hot-forged geometries
  • Drawings-to-manufacture services

Custom components can be supplied with complete traceability and EN 10204 certification requirements.

23. Dimensional Logic of Fastener Design

Fastener dimensions directly influence:

  • Tensile capacity
  • Shear resistance
  • Fatigue performance
  • Assembly clearance
  • Torque capability

Critical dimensions include:

DimensionFunction
DiameterLoad carrying capability
PitchThread engagement
Head WidthTorque transmission
Head HeightStructural strength
Thread LengthJoint engagement
Grip LengthLoad transfer

24. Metric Thread System

Metric fasteners are globally standardized under ISO requirements.

Thread designation:

Example:

M16 × 2.0 × 100

Where:

  • M = Metric thread
  • 16 = Nominal diameter (mm)
  • 2.0 = Pitch (mm)
  • 100 = Length (mm)

25. Unified Thread System (UNC/UNF)

Widely used in North America and oil & gas industries.

UNC Threads

Coarse thread profile.

Advantages:

  • Better damage resistance
  • Easier assembly
  • Improved field installation

UNF Threads

Fine thread profile.

Advantages:

  • Higher preload
  • Better fatigue performance
  • Improved vibration resistance

26. British Thread Systems

Still encountered in maintenance and legacy industrial equipment.

BSW

British Standard Whitworth

55° thread angle.

BSF

British Standard Fine

Smaller pitch than BSW.

27. Thread Standards and Tolerances

Thread Standards & Tolerance Comparison Table

Thread SystemStandardThread AngleTypical Tolerance
Metric CoarseISO 26160°6g / 6H
Metric FineISO 26160°6g / 6H
UNCASME B1.160°2A / 2B
UNFASME B1.160°2A / 2B
BSWBS 8455°Medium
BSFBS 8455°Medium

28. Dimensional Specification Table – Metric Hex Bolts

ISO 4017 / DIN 933

SizePitch (mm)Head Width AF (mm)Head Height (mm)
M61.0104
M81.25135.3
M101.5176.4
M121.75197.5
M162.02410
M202.53012.5
M243.03615
M303.54618.7
M364.05522.5

29. Standard Length Range Table

Typical Manufacturing Capability

DiameterStandard Length Range
M610–150 mm
M815–200 mm
M1020–300 mm
M1225–350 mm
M1630–400 mm
M2040–500 mm
M2450–600 mm
M3080–800 mm
M36100–1000 mm

Custom lengths can be manufactured according to project drawings.

30. Thread Pitch Selection Logic

Coarse Threads

Preferred when:

  • Frequent assembly/disassembly
  • Dirty environments
  • Field installation
  • Softer materials

Fine Threads

Preferred when:

  • High preload required
  • Vibration present
  • Limited engagement length
  • Precision equipment

31. Fastener Geometry and Load Distribution

Head Geometry Effects

Larger head dimensions:

  • Reduce bearing stress
  • Improve torque transfer
  • Enhance fatigue performance

Thread Root Geometry

Thread root radius significantly affects:

  • Fatigue life
  • Crack initiation resistance
  • Stress concentration factor

Rolled threads generally outperform cut threads due to favorable grain flow and compressive residual stress.

32. Bearing Surface Considerations

Bearing stress is influenced by:

  • Washer diameter
  • Head diameter
  • Surface finish
  • Material hardness

Higher bearing area results in:

  • Lower compressive stress
  • Reduced embedment
  • Improved preload retention

33. Applicable International Standards

Material Standards

StandardScope
ASTM B160Nickel rod and bar
ASTM B564Nickel forgings
ASTM B162Nickel plate and sheet
ASTM F468Nonferrous bolts
ASTM F467Nonferrous nuts

Dimensional Standards

StandardScope
ISO 4014Hex bolts
ISO 4017Full-thread bolts
ISO 4762Socket screws
ISO 4032Hex nuts
ISO 7089Washers
DIN 931Hex bolts
DIN 933Hex bolts
DIN 934Hex nuts
DIN 125Washers
BS 3692Metric fasteners

34. Interchangeability Considerations

When replacing fasteners in existing installations:

Verify:

  • Thread form compatibility
  • Pitch compatibility
  • Head dimensions
  • Strength requirements
  • Corrosion resistance
  • Service temperature

Improper interchangeability may result in:

  • Thread stripping
  • Galling
  • Joint failure
  • Reduced preload
  • Leakage in pressure systems

35. Fastener Selection Matrix

RequirementRecommended Grade
General Chemical ProcessingNickel 200
Elevated Temperature ServiceNickel 201
High-Purity ElectronicsNickel 270
Caustic Soda SystemsNickel 200
Heat Treatment EquipmentNickel 201
Electrical ContactsNickel 270
Instrumentation AssembliesNickel 270
Pressure Vessel FasteningNickel 200/201
Offshore Chemical SystemsNickel 200
Pharmaceutical EquipmentNickel 270

36. Procurement Considerations for EPC Projects

Project specifications should define:

  • Material grade
  • Applicable standard
  • Thread system
  • Dimensional tolerance
  • Surface finish
  • Inspection level
  • Certification requirements

SM Fasteners supports project-specific manufacturing and documentation requirements including special dimensions, custom geometries, non-standard threads, and engineered fastening solutions manufactured under ISO 9001 quality management systems.

37. Materials Engineering of Nickel Grades 200, 201 and 270

Material selection is one of the most critical engineering decisions in fastening system design. For industrial fasteners, the selected alloy must satisfy:

  • Mechanical load requirements
  • Corrosion resistance requirements
  • Operating temperature limits
  • Regulatory compliance requirements
  • Fabrication compatibility
  • Service life expectations
  • Maintenance strategy objectives

Nickel Grades 200, 201, and 270 belong to the commercially pure nickel family and are selected primarily for corrosion resistance, conductivity, and chemical stability rather than maximum mechanical strength.

38. Chemical Composition Comparison

Element (%)Nickel 200Nickel 201Nickel 270
Nickel99.0 Min99.0 Min99.97 Min
Carbon0.15 Max0.02 Max0.01 Max
Iron0.40 Max0.40 MaxVery Low
Copper0.25 Max0.25 MaxTrace
Manganese0.35 Max0.35 MaxTrace
Silicon0.35 Max0.35 MaxTrace
Sulfur0.01 Max0.01 MaxExtremely Low

39. Mechanical Properties Comparison

Mechanical properties vary depending upon product form, manufacturing route, and condition.

Mechanical Properties Table

PropertyNickel 200Nickel 201Nickel 270
Tensile Strength (MPa)380–550345–520345–480
Yield Strength (MPa)100–18080–16070–150
Elongation (%)35–5035–5040–55
Hardness (HB)70–12065–11060–100
Modulus of Elasticity (GPa)207207205
Density (g/cm³)8.898.898.90

40. Material Selection Criteria

Nickel 200

Preferred when:

  • Strong caustic resistance is required
  • Moderate temperature service exists
  • Corrosion resistance is primary concern
  • Process equipment operates below 315°C

Typical applications:

  • Caustic soda plants
  • Chlor-alkali facilities
  • Chemical reactors
  • Heat exchangers

Nickel 201

Preferred when:

  • Elevated temperatures exceed 315°C
  • Long-term thermal exposure occurs
  • Carbon graphitization risk must be minimized

Typical applications:

  • Thermal processing equipment
  • Furnace systems
  • Heat treatment plants
  • High-temperature piping supports

Nickel 270

Preferred when:

  • High electrical conductivity is required
  • Magnetic characteristics are critical
  • Electronic purity requirements exist

Typical applications:

  • Electronics manufacturing
  • Semiconductor equipment
  • Instrumentation systems
  • Precision electrical assemblies

41. Material Comparison Against Alternative Alloys

Industrial Material Comparison Table

MaterialUTS (MPa)Yield (MPa)Corrosion ResistanceRelative CostTypical Application
Nickel 200380–550100–180ExcellentHighChemical plants
Nickel 201345–52080–160ExcellentHighHigh temperature systems
Nickel 270345–48070–150ExcellentVery HighElectronics
SS 304515–620205GoodMediumGeneral industrial
SS 316515–620205Very GoodMedium-HighMarine applications
Duplex 2205620–880450ExcellentHighOffshore service
Monel 400550–760240OutstandingVery HighMarine and chemical
Inconel 625827–1034414ExceptionalPremiumHigh-temperature service

42. Corrosion Resistance by Environment

Commercially pure nickel exhibits exceptional resistance in reducing environments.

Corrosion Resistance Comparison Table

EnvironmentNickel 200Nickel 201Nickel 270
Fresh WaterExcellentExcellentExcellent
SeawaterVery GoodVery GoodVery Good
Caustic SodaExcellentExcellentExcellent
Hydrochloric Acid (Dilute)GoodGoodGood
Sulfuric AcidModerateModerateModerate
Nitric AcidLimitedLimitedLimited
Alkaline SolutionsExcellentExcellentExcellent
ChloridesGoodGoodGood
H₂S EnvironmentGoodGoodGood
Food Processing MediaExcellentExcellentExcellent

43. Temperature Capability

Service Temperature Table

GradeContinuous Service Temperature
Nickel 200Up to ~315°C
Nickel 201Up to ~600°C
Nickel 270Typically Below 400°C
SS 316Up to ~870°C
Inconel 625Above 980°C

Actual service limits depend upon mechanical load and environmental exposure.

44. Sour Service Considerations

Oil and gas facilities frequently specify compliance with:

  • NACE MR0175
  • ISO 15156

Considerations include:

  • Hardness limitations
  • Sulfide stress cracking resistance
  • Material traceability
  • Heat treatment controls

Commercially pure nickel grades generally exhibit favorable resistance to hydrogen-related cracking compared to high-strength alloy steels.

Engineering verification should always be performed against project-specific specifications.

45. Heat Treatment of Nickel Fasteners

Unlike alloy steels, commercially pure nickel fasteners are generally not strengthened through quench-and-temper processes.

Heat treatment is primarily performed to:

  • Improve ductility
  • Relieve residual stress
  • Refine grain structure
  • Improve machinability
  • Enhance cold-forming characteristics

46. Annealing Process

Annealing is the most common heat treatment for Nickel 200, 201, and 270 fasteners.

Objectives

  • Stress relief
  • Softening
  • Grain refinement
  • Ductility restoration

Typical Process

StageDescription
Heating700–900°C
SoakingControlled duration
CoolingAir cooling or controlled cooling

Benefits:

  • Improved formability
  • Reduced residual stress
  • Enhanced corrosion resistance consistency

47. Stress Relief Treatment

Applied after:

  • Cold forming
  • Thread rolling
  • Machining operations

Purpose:

  • Reduce residual stresses
  • Improve dimensional stability
  • Minimize distortion

Typical range:

450–650°C depending on material condition.

48. Cold Working Effects

Cold working increases strength through strain hardening.

Effects include:

PropertyEffect
Yield StrengthIncreases
Tensile StrengthIncreases
HardnessIncreases
DuctilityDecreases
FormabilityDecreases

This process is frequently utilized to achieve higher strength levels in nickel fasteners.

49. Hardness Control Requirements

For critical industrial projects hardness verification may be required.

Testing standards:

  • ASTM E10 (Brinell)
  • ASTM E18 (Rockwell)
  • ASTM E384 (Microhardness)

Typical acceptance criteria are specified in project purchase orders and EPC specifications.

50. End-to-End Manufacturing Workflow

SM Fasteners follows a controlled manufacturing workflow aligned with ISO 9001 quality management requirements.

Stage 1 – Raw Material Procurement

Approved mills provide:

  • Nickel bar
  • Nickel wire rod
  • Nickel forgings

Material supplied with:

  • Mill Test Certificates (MTC)
  • Heat numbers
  • Chemical analysis records

Stage 2 – Incoming Material Verification

Verification activities include:

  • Material identification
  • Heat number validation
  • Chemical composition review
  • Dimensional inspection
  • Visual examination

Where specified:

  • PMI testing
  • Spectrometer verification

51. Stage 3 – Material Cutting

Raw material is cut according to manufacturing requirements.

Methods:

  • Band sawing
  • Abrasive cutting
  • CNC cutting

Controls:

  • Length tolerance
  • Surface quality
  • Traceability preservation

52. Stage 4 – Forging Operations

Hot forging is preferred for larger fasteners.

Advantages:

  • Improved grain flow
  • Better fatigue resistance
  • Higher structural integrity

Typical products:

  • Hex bolts
  • Heavy hex bolts
  • Custom forged fasteners
  • Structural bolts

53. Forging vs Machining Comparison

ParameterForgingMachining
Grain FlowSuperiorInterrupted
Fatigue StrengthHigherLower
Material WasteLowerHigher
Large Production RunsExcellentModerate
Custom ComponentsModerateExcellent

54. Stage 5 – CNC Machining

Precision machining operations include:

  • Turning
  • Milling
  • Drilling
  • Slotting
  • Grooving

Used for:

  • Custom fasteners
  • Special geometries
  • Tight tolerance applications

55. Stage 6 – Thread Manufacturing

Threads may be produced through:

Thread Rolling

Advantages:

  • Improved fatigue strength
  • Better surface finish
  • Compressive residual stresses
  • Higher thread accuracy

Thread Cutting

Advantages:

  • Suitable for large diameters
  • Prototype production
  • Special thread forms

56. Thread Rolling vs Thread Cutting

ParameterRolled ThreadCut Thread
Fatigue StrengthExcellentGood
Surface FinishSuperiorModerate
Production RateHighLower
Material RemovalNonePresent
Grain ContinuityMaintainedInterrupted

For critical industrial service, rolled threads are generally preferred.

57. Stage 7 – Heat Treatment and Stress Relief

Depending on product specification:

  • Annealing
  • Stress relieving
  • Controlled cooling

Performed under monitored furnace conditions.

58. Stage 8 – Final Machining and Deburring

Operations include:

  • Chamfering
  • Surface refinement
  • Burr removal
  • Thread cleaning

Ensures assembly readiness.

59. Surface Finishing of Nickel Fasteners

Because nickel alloys inherently resist corrosion, heavy protective coatings are generally unnecessary.

Surface finishing is selected to:

  • Improve appearance
  • Reduce galling
  • Enhance cleanliness
  • Improve assembly characteristics

60. Available Surface Finishes

As-Manufactured Finish

Most common finish.

Characteristics:

  • Economical
  • Fully traceable
  • Suitable for industrial service

Bright Finished

Provides:

  • Improved appearance
  • Easier cleaning
  • Reduced contamination retention

Used in:

  • Pharmaceutical systems
  • Food processing
  • Instrumentation equipment

Mechanical Polishing

Produces smoother surfaces.

Benefits:

  • Reduced surface roughness
  • Improved cleanliness
  • Better corrosion performance

Electropolishing

Provides:

  • Extremely smooth surface
  • Enhanced corrosion performance
  • Reduced microbial retention

Widely used in sanitary applications.

61. Coating Technologies

Although uncommon for pure nickel fasteners, certain coatings may be specified.

PTFE Coating

Benefits:

  • Reduced friction
  • Anti-galling properties
  • Chemical resistance

Xylan Coating

Benefits:

  • Low coefficient of friction
  • Easier installation
  • Improved torque consistency

Dry Film Lubricants

Used where:

  • Galling risk exists
  • Repeat assembly is expected
  • Controlled preload is required

62. Surface Finish Comparison Table

Finish TypeCorrosion ResistanceFriction PerformanceCleanlinessTypical Application
As-ManufacturedExcellentModerateModerateGeneral industrial
Bright FinishExcellentModerateGoodProcess equipment
Mechanical PolishExcellentGoodVery GoodFood processing
ElectropolishExcellentGoodExcellentPharmaceutical
PTFE CoatedExcellentExcellentVery GoodAnti-galling service
Xylan CoatedExcellentExcellentGoodOffshore assemblies

63. Selection of Surface Finish by Industry

IndustryPreferred Finish
Chemical ProcessingAs-Manufactured
PetrochemicalPTFE Coated
OffshoreXylan Coated
PharmaceuticalElectropolished
Food ProcessingMechanical Polish
ElectronicsBright Finish
SemiconductorElectropolished
LNG FacilitiesPTFE Coated

64. Integration with Advanced Materials Portfolio

In addition to Nickel 200, 201, and 270 fasteners, SM Fasteners manufactures fastening solutions in:

  • Stainless Steel
  • Duplex Stainless Steel
  • Super Duplex Stainless Steel
  • Monel
  • Inconel
  • Incoloy
  • Hastelloy
  • SMO 254
  • Alloy Steel
  • Carbon Steel
  • PEEK Fasteners

PEEK fasteners may be selected where:

  • Electrical insulation is required
  • Metal-free assemblies are needed
  • Lightweight construction is critical
  • Chemical resistance is essential
  • EMI-sensitive environments exist

65. Inspection and Quality Control Requirements

Nickel fasteners used in EPC projects, pressure equipment, offshore installations, power generation facilities, and chemical processing plants must undergo comprehensive quality assurance procedures to ensure compliance with design specifications and international standards.

SM Fasteners operates under an ISO 9001-certified quality management system with full traceability from raw material procurement through final inspection and shipment.

Quality assurance objectives include:

  • Dimensional conformity
  • Mechanical property verification
  • Material verification
  • Traceability maintenance
  • Documentation compliance
  • Customer specification adherence

66. Incoming Material Inspection

Before production begins, incoming Nickel 200, Nickel 201, and Nickel 270 materials undergo verification.

Inspection Activities

Inspection ItemVerification Method
Heat NumberMTC Verification
Chemical CompositionSpectrometer Analysis
Material GradePMI Testing
DiameterCalibrated Measuring Equipment
Surface ConditionVisual Inspection
Certification ReviewDocumentation Verification

67. In-Process Inspection

Critical process stages are monitored to ensure dimensional and metallurgical consistency.

In-Process Controls

  • Forging dimensional checks
  • Thread profile verification
  • Head geometry inspection
  • Length measurement
  • Surface finish verification
  • Heat treatment monitoring

68. Final Inspection Requirements

Final inspection confirms compliance before shipment.

Inspection Parameters

ParameterInspection Method
DiameterVernier / Micrometer
LengthCalibrated Scale
Thread AccuracyThread Gauges
Head DimensionsPrecision Gauges
Surface QualityVisual Examination
Marking VerificationVisual Inspection
Packaging InspectionQA Review

69. Dimensional Inspection Standards

Common dimensional inspection standards include:

StandardScope
ISO 3269Acceptance inspection
ISO 4759Dimensional tolerances
ISO 965Metric thread tolerances
ASME B1.1Unified thread tolerances
DIN StandardsProduct-specific dimensions

70. Positive Material Identification (PMI)

PMI testing is frequently required in:

  • Refineries
  • Petrochemical facilities
  • LNG plants
  • Offshore projects
  • Power generation facilities

Purpose

To verify:

  • Nickel content
  • Alloy composition
  • Material authenticity
  • Traceability integrity

Typical Methods

  • XRF Analysis
  • OES Spectrometry

71. Mechanical Testing Requirements

Tensile Testing

Conducted according to applicable ASTM standards.

Verifies:

  • Ultimate Tensile Strength
  • Yield Strength
  • Elongation

Hardness Testing

Standards:

  • ASTM E10
  • ASTM E18
  • ASTM E384

Purpose:

  • Heat treatment verification
  • Material consistency confirmation
  • Sour service compliance review

Proof Load Testing

Proof load testing verifies the fastener’s ability to sustain service loads without permanent deformation.

72. Proof Load & Tensile Strength Reference Table

SizeStress Area (mm²)Typical Proof Load (kN) Nickel 200Typical Tensile Capacity (kN) Nickel 200
M620.12.27.6
M836.64.013.9
M1058.06.422.0
M1284.39.332.0
M1615717.359.7
M2024527.093.1
M2435338.8134.1
M3056161.7213.2
M3681789.9310.5

Values are engineering reference values and should be verified against project-specific material condition and applicable standards.

73. Non-Destructive Testing (NDT)

Where specified, NDT methods may be applied.

Common NDT Techniques

MethodPurpose
Dye Penetrant Testing (PT)Surface crack detection
Ultrasonic Testing (UT)Internal discontinuities
Magnetic Particle TestingLimited applicability due to nickel characteristics
Visual Testing (VT)Surface evaluation

74. Thread Inspection and Acceptance

Thread quality is essential for preload consistency.

Inspection Tools

  • GO Gauges
  • NO-GO Gauges
  • Thread Micrometers
  • Optical Comparators

Verification Parameters

  • Major diameter
  • Minor diameter
  • Pitch diameter
  • Thread angle
  • Pitch accuracy

75. Calibration and Metrology

Inspection equipment must be calibrated and traceable.

Examples:

  • Micrometers
  • Verniers
  • Height gauges
  • Thread gauges
  • Hardness testers
  • Spectrometers

Calibration systems should align with ISO 9001 quality requirements.

76. Industry Applications

Construction & Structural Steel

Nickel fasteners may be selected where corrosion resistance exceeds conventional structural fastener capability.

Applications include:

  • Coastal structures
  • Chemical storage facilities
  • Wastewater infrastructure
  • Specialized industrial buildings

Oil & Gas Industry

Upstream

  • Wellhead auxiliary systems
  • Instrumentation
  • Process skids

Midstream

  • Compressor stations
  • Metering systems
  • Pipeline accessories

Downstream

  • Refinery equipment
  • Process vessels
  • Heat exchangers

Power Generation

Applications include:

  • Boiler auxiliary systems
  • FGD systems
  • Cooling water equipment
  • Nuclear support systems
  • Turbine auxiliary equipment

Petrochemical & Chemical Processing

One of the largest users of Nickel 200 and Nickel 201 fasteners.

Typical applications:

  • Caustic soda plants
  • Chlor-alkali facilities
  • Acid handling systems
  • Process reactors
  • Distillation units

LNG & Offshore Facilities

Used in:

  • Offshore topsides
  • Instrumentation systems
  • Marine equipment
  • Corrosion-critical assemblies

Automotive & Heavy Equipment

Applications include:

  • Specialty electrical systems
  • Corrosion-critical components
  • Experimental and prototype assemblies

Railways & Infrastructure

Used where:

  • Corrosion resistance
  • Electrical conductivity
  • Long-term reliability

are required.

Shipbuilding

Applications include:

  • Marine process equipment
  • Instrumentation systems
  • Corrosion-resistant fastening assemblies

Electronics & Instrumentation

Nickel 270 is especially valuable in:

  • Semiconductor manufacturing
  • Precision instrumentation
  • Electronic assemblies
  • Conductive fastening systems

77. PEEK Fastener Applications

As part of SM Fasteners’ advanced materials portfolio, PEEK fasteners may be specified when metallic fasteners are unsuitable.

Typical Uses

RequirementPEEK Advantage
Electrical InsulationNon-conductive
Weight ReductionLightweight
Chemical ResistanceExcellent
EMI-Sensitive SystemsNon-metallic
Semiconductor EquipmentLow contamination

78. Tightening Torque Reference Table

Nickel 200 Fasteners (Typical Engineering Values)

Dry Installation

SizeRecommended Torque (Nm)
M65–7
M812–16
M1024–30
M1240–55
M1695–120
M20180–240
M24320–420
M30620–800

Lubricated Installation

SizeRecommended Torque (Nm)
M64–6
M810–13
M1020–25
M1235–45
M1680–105
M20150–200
M24280–360
M30540–700

Final torque values must always be verified against the actual fastener condition, lubricant, coating, and project specification.

79. Weight Chart for Nickel Hex Bolts

Approximate Unit Weight Reference

Size × LengthWeight Per Piece (kg)Weight Per 100 Pieces (kg)
M8 × 500.0282.8
M10 × 600.0555.5
M12 × 750.10510.5
M16 × 1000.24524.5
M20 × 1200.47547.5
M24 × 1500.89589.5
M30 × 1801.780178
M36 × 2203.150315

Actual weights vary according to thread length, head style, tolerances, and customer-specific requirements. SM Fasteners can provide project-specific weight schedules.

80. Packaging Requirements

Industrial fasteners require packaging that protects against:

  • Mechanical damage
  • Moisture exposure
  • Contamination
  • Thread damage
  • Transit vibration

Standard Packaging

  • Corrugated export cartons
  • HDPE bags
  • Heat-sealed packaging
  • Batch identification labels

81. VCI Protection Systems

For international shipments, VCI (Volatile Corrosion Inhibitor) packaging may be utilized.

Benefits:

  • Corrosion prevention
  • Long-term storage protection
  • Improved export reliability

82. Thread Protection Systems

Protection methods include:

  • Plastic thread caps
  • Thread sleeves
  • Protective wrapping
  • Partitioned packaging

These measures reduce transit damage and installation issues.

83. Export Crating Requirements

Large project shipments may require:

  • Wooden export crates
  • Steel-reinforced pallets
  • Moisture barrier packaging
  • Containerized shipment preparation

Compliance

ISPM-15 compliant export packaging is recommended for international shipments.

84. Documentation Package for EPC Projects

Comprehensive documentation is frequently required by:

  • EPC Contractors
  • Refinery Operators
  • Power Utilities
  • Offshore Operators
  • Government Infrastructure Projects

Material Test Certificate (MTC)

Contains:

  • Heat number
  • Chemical composition
  • Mechanical properties
  • Traceability data

EN 10204 3.1 Certification

Provides:

  • Manufacturer-certified inspection results
  • Traceability assurance
  • Material verification

EN 10204 3.2 Certification

Provides:

  • Independent third-party witnessing
  • Enhanced project compliance

Heat Treatment Report

Includes:

  • Furnace identification
  • Temperature records
  • Process parameters
  • Compliance verification

Inspection Report

May include:

  • Dimensional inspection results
  • Mechanical testing data
  • Thread inspection records
  • Visual inspection findings

Certificate of Conformity (CoC)

Confirms:

  • Compliance with purchase order
  • Compliance with applicable standards
  • Manufacturing traceability

85. Procurement Checklist for Global Buyers

Before ordering Nickel 200/201/270 fasteners, verify:

RequirementStatus
Material Grade Defined
Applicable Standard Specified
Dimensions Confirmed
Thread Type Confirmed
Coating Requirement Defined
Inspection Level Specified
Certification Requirement Defined
Packaging Requirement Defined
Traceability Requirement Defined
Delivery Schedule Approved

86. SM Fasteners Manufacturing & Supply Capability

SM Fasteners supports industrial projects through:

  • ISO 9001 Quality Management Systems
  • MSME Registration
  • UKAF-Certified Quality Frameworks
  • Precision Manufacturing Capability
  • Custom Fastener Engineering
  • Advanced Alloy Expertise
  • Nickel, Monel, Inconel, Incoloy, Hastelloy, Duplex and Super Duplex Manufacturing Capability
  • PEEK Fastener Manufacturing Solutions
  • Complete Inspection and Traceability Systems
  • EPC Project Documentation Support
  • Export-Oriented Packaging and Logistics Readiness

Conclusion

Nickel Grades 200, 201, and 270 fasteners provide a highly specialized fastening solution for corrosive, high-purity, thermally demanding, and electrically sensitive industrial environments. Their exceptional resistance to caustic media, excellent corrosion performance, high conductivity, and long-term reliability make them suitable for chemical processing, petrochemical facilities, power generation, offshore installations, instrumentation systems, and electronic manufacturing.

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