BRASS C360 / C385 / CuZn39Pb3

1. Introduction to Brass C360, C385 and CuZn39Pb3 Fasteners

Brass fasteners manufactured from C360 Free-Cutting Brass, C385 Architectural Brass, and CuZn39Pb3 Leaded Brass are widely utilized in applications requiring a combination of:

  • Corrosion resistance
  • Excellent machinability
  • Electrical conductivity
  • Non-magnetic characteristics
  • Decorative appearance
  • Reliable mechanical performance under moderate loads

These alloys are extensively employed across:

  • Electrical equipment
  • Instrumentation systems
  • Construction hardware
  • Marine accessories
  • Architectural assemblies
  • Telecommunications infrastructure
  • Water distribution systems
  • Precision mechanical equipment

SM Fasteners manufactures precision brass fasteners in accordance with international standards and customer-specific engineering requirements, supported by ISO 9001 quality systems and global industrial supply capabilities.

2. Technical Definition

Brass is a copper-zinc alloy family engineered to provide balanced mechanical and corrosion-resistant properties.

The most common grades include:

GradeUNS NumberEN DesignationTypical Description
C36000UNS C36000CuZn36Pb3Free Cutting Brass
C38500UNS C38500CuZn39Pb3Architectural Brass
CuZn39Pb3CW614NEN 12164Leaded Forging Brass

These alloys contain controlled lead additions which improve:

  • Chip formation
  • Machinability
  • Thread quality
  • Dimensional precision
  • Tool life

As a result, brass fasteners are particularly suitable for:

  • Precision machined bolts
  • Instrument screws
  • Electrical terminals
  • Brass nuts
  • Threaded inserts
  • Custom turned components

3. Functional Role of Brass Fasteners

The primary purpose of a brass fastener is to create a removable or permanent mechanical joint while simultaneously providing:

Mechanical Functions

  • Clamping force generation
  • Load transfer
  • Position retention
  • Component alignment

Electrical Functions

  • Current conduction
  • Grounding continuity
  • Electrical bonding

Environmental Functions

  • Corrosion protection
  • Galvanic compatibility with copper systems
  • Spark resistance

Aesthetic Functions

  • Decorative architectural appearance
  • High-quality surface finish
  • Long-term color stability
r . f . q

4. Industry Relevance

Construction Sector

Applications include:

  • Architectural facades
  • Handrails
  • Decorative fixtures
  • Door hardware
  • Curtain wall systems

Electrical Industry

Used in:

  • Busbar assemblies
  • Terminal blocks
  • Earthing systems
  • Control panels

Water Systems

Common in:

  • Plumbing hardware
  • Valves
  • Meters
  • Pumps

Telecommunications

Applications include:

  • Antenna mounting systems
  • Signal transmission equipment
  • Grounding assemblies

Marine Industry

Used for:

  • Deck hardware
  • Electrical fittings
  • Navigation equipment

5. Mechanical Behavior of Brass Fasteners

Brass behaves differently than carbon steel and alloy steel fasteners.

Key characteristics:

PropertyBrassCarbon Steel
Elastic ModulusLowerHigher
DuctilityHighModerate
Corrosion ResistanceExcellentModerate
Electrical ConductivityHighLow
Magnetic ResponseNon-MagneticMagnetic
Galling TendencyLowModerate

Brass provides superior corrosion performance but lower load-carrying capacity than high-strength alloy steel fasteners.

6. Load Mechanics in Bolted Joints

Every bolted assembly functions through generated preload.

When tightened:

  1. Bolt elongates.
  2. Joint compresses.
  3. Clamping force develops.
  4. External loads are resisted through friction.

The load path becomes:

Torque → Bolt Tension → Clamp Load → Joint Integrity

Brass fasteners follow identical mechanical principles but require lower tightening torques due to lower yield strength.

7. Types of Loads Acting on Brass Fasteners

Tensile Load

Acts parallel to fastener axis.

Examples:

  • Instrument mounting
  • Electrical panel assemblies
  • Structural brackets

Formula:σ=FA\sigma = \frac{F}{A}

Where:

  • σ = Tensile stress
  • F = Applied force
  • A = Stress area

Shear Load

Acts perpendicular to fastener axis.

Examples:

  • Cover plates
  • Electrical enclosures
  • Mounting brackets

Formula:τ=FA\tau = \frac{F}{A}

Combined Loading

Most industrial joints experience:

  • Tensile load
  • Shear load
  • Vibration
  • Thermal cycling

simultaneously.

r . f . q

Joint design must account for combined stresses.

8. Clamp Load Fundamentals

A fastener’s effectiveness depends primarily on preload rather than ultimate strength.

Clamp load:Fclamp=TK×DF_{clamp}= \frac{T}{K \times D}

Where:

SymbolMeaning
FclampClamp Load
TTightening Torque
KNut Factor
DNominal Diameter

9. Torque-Tension Relationship

Only a small percentage of applied torque becomes preload.

Typical distribution:

Energy UsagePercentage
Thread Friction40%
Bearing Friction50%
Useful Bolt Stretch10%

Therefore lubrication significantly influences preload accuracy.

10. Friction Effects

Brass naturally possesses favorable anti-seizing characteristics.

Typical friction coefficients:

ConditionCoefficient
Dry Brass0.18–0.22
Light Oil0.12–0.16
PTFE Coated0.08–0.12

Reduced friction improves preload consistency.

11. Thread Engagement Requirements

Proper thread engagement prevents stripping.

Recommended minimum engagement:

Material CombinationEngagement
Brass-Brass1.5D
Brass-Steel1.0D
Brass-Aluminum2.0D

Where D = nominal diameter.

12. Joint Design Principles

Principle 1: Maintain Elastic Preload

Fastener should remain within elastic range.

Benefits:

  • Prevents permanent deformation
  • Allows reuse
  • Maintains clamp load

Principle 2: Avoid Excessive Torque

Overtightening may cause:

  • Thread stripping
  • Yielding
  • Joint relaxation

Especially important with brass due to lower yield strength.

Principle 3: Control Bearing Pressure

Brass is softer than steel.

Use:

  • Flat washers
  • Large bearing surfaces
  • Flanged designs

to reduce local crushing.

Principle 4: Minimize Galvanic Corrosion

When mating brass with dissimilar metals:

  • Isolate where required
  • Use compatible coatings
  • Consider moisture exposure

13. Failure Mechanisms in Brass Fasteners

Tensile Failure

Occurs when applied stress exceeds ultimate tensile strength.

Characteristics:

  • Necking
  • Plastic deformation
  • Fracture

Thread Stripping

Most common failure mode in brass assemblies.

Causes:

  • Insufficient engagement
  • Excessive torque
  • Soft mating material

Shear Failure

Occurs across the fastener cross-section.

Common in:

  • Hinges
  • Mounting brackets
  • Mechanical fixtures

Fatigue Failure

Produced by cyclic loading.

Initiated at:

  • Thread roots
  • Surface defects
  • Stress concentrations

Stress Corrosion Cracking

Possible under:

  • Ammonia exposure
  • Certain industrial atmospheres
  • Residual tensile stresses

Proper material selection is essential.

Galvanic Corrosion

Occurs when brass contacts:

  • Carbon steel
  • Aluminum
  • Zinc-coated components

in conductive environments.

14. Fatigue Considerations

Fatigue resistance depends on:

  • Surface finish
  • Preload level
  • Thread quality
  • Residual stress

Rolled threads generally outperform cut threads due to beneficial compressive stresses.

15. Thermal Expansion Effects

Brass coefficient of thermal expansion:

Approximately:20×10−6/°C20 \times 10^{-6}/°C

Higher than carbon steel.

Joint designers must account for thermal cycling in:

  • Electrical equipment
  • Heat exchangers
  • Marine systems

16. Electrical Conductivity Benefits

Brass offers conductivity far superior to steel.

Typical conductivity:

Material% IACS
Copper100
Brass C36026–30
Stainless Steel2–3

Therefore brass fasteners are frequently specified in:

  • Earthing systems
  • Electrical switchgear
  • Power distribution equipment

17. Corrosion Resistance Overview

Brass provides excellent resistance to:

  • Atmospheric corrosion
  • Fresh water
  • Industrial environments
  • Humidity

However caution is required in:

  • Strong acids
  • Ammonia-containing environments
  • Certain chloride-rich conditions

18. Engineering Selection Criteria

Selection should consider:

Mechanical Requirements

  • Tensile load
  • Shear load
  • Fatigue loading

Environmental Requirements

  • Moisture exposure
  • Saltwater exposure
  • Chemical contact

Functional Requirements

  • Conductivity
  • Appearance
  • Magnetic neutrality

Regulatory Requirements

  • ASTM compliance
  • EN compliance
  • Customer specifications

19. Advantages of Brass Fasteners

Benefits

  • Excellent machinability
  • Attractive finish
  • Good corrosion resistance
  • Non-magnetic
  • Conductive
  • Low galling tendency
  • Easy fabrication

Limitations

  • Lower strength than alloy steel
  • Lower fatigue resistance than high-strength steel
  • Not suitable for extreme structural loads

20. SM Fasteners Engineering Capability

SM Fasteners manufactures precision brass fasteners including:

  • Hex Bolts
  • Hex Nuts
  • Machine screws
  • Set screws
  • Washers
  • Threaded rods
  • Inserts
  • Custom CNC-machined fasteners

Manufacturing capabilities include:

  • Metric and imperial threads
  • Custom geometries
  • Precision machining
  • International standards compliance
  • Full traceability systems
  • Project-specific documentation packages

21. Product Types and Variants

Brass fasteners manufactured from C36000, C38500, and CuZn39Pb3 (CW614N) are available in numerous configurations to satisfy mechanical, electrical, architectural, marine, and industrial assembly requirements.

SM Fasteners manufactures standard and custom-engineered brass fastening systems in accordance with international dimensional and thread standards.

21.1 Brass Hex Head Bolts

Hex bolts are the most commonly specified brass fasteners.

Features

  • Six-sided head geometry
  • Full or partial thread options
  • Metric and imperial sizes
  • Suitable for wrench tightening

Applications

  • Electrical equipment
  • Control panels
  • Water treatment systems
  • Instrumentation assemblies
  • Architectural hardware

21.2 Brass Hex Screws

Hex screws provide threaded fastening into tapped holes without requiring a nut.

Advantages

  • Compact installation
  • Reduced assembly components
  • Good electrical continuity

21.3 Brass Machine Screws

Machine screws are precision threaded fasteners designed for lower-load assemblies.

Head Styles

  • Pan Head
  • Cheese Head
  • Round Head
  • Flat Head
  • Oval Head
  • Truss Head

Common Applications

  • Electronics
  • Telecommunications
  • Instrumentation
  • Electrical terminals

21.4 Brass Socket Head Cap Screws

Used where higher tightening control and recessed installation are required.

Benefits

  • Compact design
  • Improved appearance
  • Precise torque application

21.5 Brass Set Screws (Grub Screws)

Used to lock components onto shafts.

Typical Uses

  • Couplings
  • Gears
  • Pulleys
  • Instrument knobs

21.6 Brass Stud Bolts

Stud bolts contain threads on both ends.

Applications

  • Valve assemblies
  • Instrument flanges
  • Electrical busbar systems
  • Pump assemblies

21.7 Brass Threaded Rods

Continuous-thread fastening components used for:

  • Suspension systems
  • Cable supports
  • HVAC assemblies
  • Electrical installations

21.8 Brass Nuts

Common Types

TypeApplication
Hex NutGeneral fastening
Jam NutLocking applications
Dome NutDecorative protection
Wing NutHand tightening
Square NutElectrical assemblies
Lock NutVibration resistance

21.9 Brass Washers

Washers distribute load and protect softer surfaces.

Types

  • Flat Washer
  • Spring Washer
  • Tooth Lock Washer
  • Fender Washer
  • Sealing Washer

21.10 Brass Rings and Custom Components

SM Fasteners manufactures:

  • Brass retaining rings
  • Precision spacers
  • Bushings
  • Threaded inserts
  • CNC-machined custom fasteners

22. Fastener Geometry Fundamentals

Fastener geometry directly influences:

  • Load distribution
  • Tightening torque
  • Fatigue performance
  • Thread engagement
  • Joint reliability

Critical dimensions include:

  • Diameter
  • Pitch
  • Head size
  • Head height
  • Thread length
  • Bearing surface

23. Nominal Diameter System

The nominal diameter defines the basic fastener size.

Metric Series

DesignationDiameter (mm)
M33
M44
M55
M66
M88
M1010
M1212
M1616
M2020
M2424

Imperial Series

SizeDiameter (in.)
1/4″0.250
5/16″0.312
3/8″0.375
1/2″0.500
5/8″0.625
3/4″0.750
1″1.000

24. Thread Pitch Fundamentals

Pitch determines axial movement per revolution.

Metric Formula

Pitch=Distance between adjacent threadsPitch = Distance\ between\ adjacent\ threads

Example:

M10 × 1.5

Where:

  • Diameter = 10 mm
  • Pitch = 1.5 mm

25. Metric Thread Specification Table

ISO Metric Coarse Threads

SizePitch (mm)
M30.50
M40.70
M50.80
M61.00
M81.25
M101.50
M121.75
M162.00
M202.50
M243.00

ISO Metric Fine Threads

SizePitch (mm)
M81.00
M101.25
M121.50
M161.50
M201.50
M242.00

26. Unified Thread Standards

UNC Thread Series

DiameterThreads/Inch
1/4″20
5/16″18
3/8″16
1/2″13
5/8″11
3/4″10

UNF Thread Series

DiameterThreads/Inch
1/4″28
5/16″24
3/8″24
1/2″20
5/8″18
3/4″16

27. British Thread Standards

BSW Threads

SizeTPI
1/4″20
5/16″18
3/8″16
1/2″12

BSF Threads

SizeTPI
1/4″26
5/16″22
3/8″20
1/2″16

28. Thread Standards and Tolerances

StandardTolerance Class
ISO Metric External6g
ISO Metric Internal6H
Unified External2A
Unified Internal2B
Precision Metric4g6g
Precision Internal5H

These tolerances ensure interchangeability across global supply chains.

29. Hex Bolt Dimensional Specification Table

DIN 933 / ISO 4017 Hex Bolts

SizeHead Width (s) mmHead Height (k) mm
M6104
M8135.3
M10176.4
M12197.5
M162410
M203012.5
M243615

30. Standard Length Range

DiameterStandard Lengths (mm)
M46–60
M58–80
M610–100
M812–150
M1016–200
M1220–300
M1625–300
M2030–300

Custom lengths can be produced by SM Fasteners according to project requirements.

31. Applicable International Standards

ISO Standards

StandardDescription
ISO 4014Hex Bolts
ISO 4017Hex Screws
ISO 4032Hex Nuts
ISO 7089Plain Washers
ISO 4762Socket Head Cap Screws
ISO 965Thread Tolerances
ISO 261Metric Threads

DIN Standards

StandardDescription
DIN 931Partial Thread Hex Bolt
DIN 933Full Thread Hex Bolt
DIN 934Hex Nut
DIN 125Flat Washer
DIN 127Spring Washer
DIN 912Socket Head Cap Screw

ASTM Standards

StandardDescription
ASTM B16Free Cutting Brass Rod
ASTM B124Brass Forgings
ASTM B453Brass Bolts & Screws
ASTM F468Non-Ferrous Bolts
ASTM F467Non-Ferrous Nuts

British Standards

StandardDescription
BS 3692Metric Fasteners
BS 4190Hex Bolts & Nuts
BS 4320Washers
BS 84BSW Threads
BS 1083BSF Threads

32. Mechanical Properties of Brass Grades

Mechanical Property Comparison

PropertyC36000C38500CuZn39Pb3
UTS (MPa)340–500330–480350–500
Yield Strength (MPa)125–280120–260130–280
Elongation (%)10–3515–3515–35
Hardness HB80–15080–14585–150
Density (g/cm³)8.478.458.45

33. Proof Load Table (Typical Brass Fasteners)

SizeStress Area (mm²)Proof Load (kN)
M620.13.5
M836.66.4
M1058.010.1
M1284.314.7
M1615727.5
M2024542.8

Values are representative engineering design values and should be verified against project specifications.

34. Tensile Strength Capacity Table

SizeTensile Area mm²Approx. Ultimate Load (kN)
M620.18.0
M836.614.6
M1058.023.2
M1284.333.7
M1615762.8
M2024598.0

Based on approximately 400 MPa tensile strength brass material.

35. Geometry Selection Guidelines

Coarse Threads

Preferred for:

  • General industrial use
  • Faster assembly
  • Better resistance to damage

Fine Threads

Preferred for:

  • Precision equipment
  • Vibration resistance
  • Limited engagement lengths

36. Head Style Selection Matrix

Head TypePrimary Benefit
Hex HeadHigh torque capability
Socket HeadCompact installation
Pan HeadElectrical equipment
Flat HeadFlush surface
Round HeadDecorative applications
Dome NutSafety and appearance

37. Interchangeability Considerations

For global EPC projects:

  • ISO metric remains dominant.
  • UNC/UNF common in North America.
  • BSW/BSF found in legacy infrastructure.
  • Thread verification is mandatory before replacement.

SM Fasteners supports all major international thread systems to ensure compatibility with multinational project specifications.

38. Engineering Design Considerations

When specifying Brass C360/C385/CuZn39Pb3 fasteners, engineers should evaluate:

  • Load requirements
  • Thread form
  • Corrosion environment
  • Electrical conductivity requirements
  • Aesthetic expectations
  • Service temperature
  • Inspection requirements
  • Maintenance accessibility

This ensures optimum performance and lifecycle reliability in industrial service.

39. Material Grades and Selection Criteria

The performance of brass fasteners is directly influenced by alloy chemistry, manufacturing condition, grain structure, and service environment.

For industrial fastening applications, the most commonly specified grades are:

GradeUNS NumberEN DesignationPrimary Characteristic
C36000C36000CuZn36Pb3Excellent machinability
C38500C38500CuZn39Pb3Architectural brass
CuZn39Pb3CW614NEN 12164Forging and machining brass
C35300C35300CuZn36Pb2AsDezincification resistant
C37700C37700CuZn39Pb2Hot forging brass

Among these, C36000 and CW614N/CuZn39Pb3 are the most widely used materials for precision fastener manufacturing.

40. Chemical Composition

C36000 Free Cutting Brass

ElementPercentage (%)
Copper (Cu)60.0–63.0
Zinc (Zn)Balance
Lead (Pb)2.5–3.7
Iron (Fe)≤0.35

C38500 Architectural Brass

ElementPercentage (%)
Copper57–61
ZincBalance
Lead2.5–3.5
Iron≤0.35

CuZn39Pb3 (CW614N)

ElementPercentage (%)
Copper57–59
ZincBalance
Lead2.5–3.5
Iron≤0.3

41. Material Selection Matrix

Selection should be based on service conditions rather than cost alone.

RequirementRecommended Grade
High-speed machiningC36000
Decorative hardwareC38500
Forged fastenersCW614N
Valve componentsCW614N
Electrical terminalsC36000
Precision CNC partsC36000
Architectural assembliesC38500

42. Material Comparison Table

Mechanical and Engineering Comparison

PropertyC36000C38500CuZn39Pb3
UTS (MPa)340–500330–480350–500
Yield Strength (MPa)125–280120–260130–280
Hardness HB80–15080–14585–150
Machinability (%)1008590
Conductivity (% IACS)26–3025–2825–28
Corrosion ResistanceGoodGoodGood
Relative CostMediumMediumMedium

43. Service Temperature Capability

Brass fasteners are generally intended for moderate temperature environments.

Temperature RangeSuitability
-50°C to 100°CExcellent
100°C to 150°CGood
150°C to 200°CLimited
Above 200°CNot Recommended

For elevated-temperature service, materials such as stainless steel, Inconel, Hastelloy, or Incoloy are generally preferred.

44. Corrosion Resistance by Environment

Corrosion Resistance Comparison Table

EnvironmentC360/C385/CW614N Performance
Atmospheric ExposureExcellent
HumidityExcellent
Fresh WaterExcellent
Potable WaterGood
Industrial EnvironmentGood
Marine AtmosphereGood
Seawater ImmersionFair
Dilute AlkalisGood
Sulfuric AcidPoor
Hydrochloric AcidPoor
Nitric AcidPoor
Ammonia EnvironmentPoor
Chlorinated WaterFair

45. Corrosion Resistance versus Industrial Media

Service EnvironmentSuitability
Electrical PanelsExcellent
TelecommunicationsExcellent
HVAC EquipmentExcellent
Architectural SystemsExcellent
Plumbing SystemsGood
Marine HardwareGood
Chemical PlantsConditional
Offshore PlatformsConditional
LNG FacilitiesLimited

46. Dezincification Considerations

Dezincification is a corrosion mechanism in which zinc selectively leaches from brass.

Potential risk factors:

  • Warm stagnant water
  • Chloride exposure
  • Aggressive water chemistry

Effects include:

  • Reduced strength
  • Porous surface structure
  • Leakage in fluid systems

Where resistance is critical, dezincification-resistant brass grades should be considered.

47. Galvanic Compatibility

Brass performs well when assembled with compatible materials.

Galvanic Compatibility Guide

Mating MaterialCompatibility
CopperExcellent
BrassExcellent
BronzeExcellent
Stainless SteelGood
Nickel AlloysGood
Carbon SteelFair
Zinc-Coated SteelFair
AluminumPoor

Isolation methods may be required in wet environments.

48. NACE MR0175 / ISO 15156 Considerations

Brass fasteners are generally not primary materials for:

  • Sour gas wells
  • High-H₂S production systems
  • Severe oilfield environments

For NACE-critical applications, materials typically specified include:

  • Duplex Stainless Steel
  • Super Duplex
  • Inconel
  • Monel
  • Hastelloy

SM Fasteners supports these advanced alloys when project specifications require NACE compliance.

49. Heat Treatment of Brass Fasteners

Unlike alloy steel fasteners, brass does not rely on quench-and-temper hardening.

Heat treatment is primarily performed to:

  • Improve machinability
  • Relieve residual stress
  • Enhance dimensional stability
  • Improve forming behavior

50. Stress Relieving

Typical stress relieving range:

ProcessTemperature
Stress Relief250–350°C

Benefits:

  • Reduced residual stress
  • Improved dimensional stability
  • Better fatigue performance

51. Annealing Process

Annealing restores ductility following cold working.

Typical Annealing Cycle

ParameterValue
Temperature450–650°C
Holding TimeBased on section thickness
CoolingControlled air cooling

Benefits include:

  • Increased ductility
  • Reduced hardness
  • Improved machinability

52. Manufacturing Routes for Brass Fasteners

Two primary manufacturing methods are used:

Method 1: Machining from Bar Stock

Method 2: Hot Forging + Machining

Selection depends on:

  • Quantity
  • Geometry
  • Mechanical requirements
  • Cost targets

53. Raw Material Verification

Production begins with certified raw material inspection.

Verification includes:

  • Heat number identification
  • Chemical composition review
  • Supplier qualification
  • Material traceability

Documentation generally includes:

  • Mill Test Certificate (MTC)
  • Material certificates
  • Incoming inspection records

54. Manufacturing Workflow

End-to-End Production Process

Raw Material Receipt
          ↓
Material Verification
          ↓
Cutting
          ↓
Forging (if required)
          ↓
CNC Machining
          ↓
Thread Production
          ↓
Deburring
          ↓
Cleaning
          ↓
Inspection
          ↓
Marking
          ↓
Packaging
          ↓
Dispatch

55. Hot Forging Process

Forging is commonly used for:

  • Hex bolts
  • Large nuts
  • Custom heads
  • High-volume production

Benefits:

  • Improved grain flow
  • Reduced material waste
  • Increased productivity
  • Better structural integrity

56. CNC Machining Process

CNC turning and milling are widely used for:

  • Machine screws
  • Electrical terminals
  • Precision components
  • Special fasteners

Advantages include:

  • Tight tolerances
  • Complex geometries
  • Excellent surface finish
  • Repeatability

57. Forging vs Machining Comparison

ParameterForgingMachining
StrengthHigherStandard
Material UtilizationExcellentModerate
Tooling CostHighLow
Small Batch ProductionLess SuitableIdeal
Large Production RunsExcellentGood
Complex ShapesModerateExcellent

58. Thread Manufacturing Methods

Thread quality significantly affects fastener performance.

Primary methods:

  • Thread Rolling
  • Thread Cutting

59. Thread Rolling

Threads are formed by plastic deformation.

Benefits:

  • Improved fatigue life
  • Better surface finish
  • Stronger thread roots
  • Increased production speed

Preferred whenever geometry permits.

60. Thread Cutting

Material is removed using cutting tools.

Advantages:

  • Suitable for custom sizes
  • Suitable for low-volume production
  • Applicable to large diameters

Limitations:

  • Lower fatigue resistance
  • Higher production time

61. Thread Rolling vs Thread Cutting

CharacteristicRolled ThreadCut Thread
Fatigue StrengthHigherLower
Surface FinishBetterGood
Production SpeedFasterSlower
Tool CostHigherLower
Dimensional ConsistencyExcellentGood

62. Surface Finish Requirements

Surface finish affects:

  • Corrosion resistance
  • Appearance
  • Friction coefficient
  • Thread engagement quality

63. Standard Surface Finishes

Finish TypeDescription
Natural BrassStandard machined finish
Polished BrassDecorative finish
Satin BrassLow-reflective finish
Bright BrassHigh-gloss finish
Nickel PlatedEnhanced corrosion resistance
Chrome PlatedDecorative and wear resistant
Tin PlatedElectrical conductivity improvement

64. Nickel Plating

Benefits include:

  • Improved corrosion resistance
  • Enhanced appearance
  • Increased surface hardness
  • Better wear performance

Common thickness:

5–25 microns

65. Chrome Plating

Provides:

  • Bright finish
  • Surface durability
  • Abrasion resistance

Widely used in:

  • Architectural systems
  • Decorative hardware
  • Marine accessories

66. Tin Plating

Common in electrical applications.

Advantages:

  • Solderability
  • Conductivity
  • Contact reliability

Applications:

  • Busbars
  • Connectors
  • Electrical terminals

67. Surface Finish Comparison Table

Surface FinishCorrosion ResistanceAppearanceConductivity
Natural BrassGoodGoodExcellent
Polished BrassGoodExcellentExcellent
Satin BrassGoodExcellentExcellent
Nickel PlatedVery GoodVery GoodGood
Chrome PlatedExcellentExcellentModerate
Tin PlatedGoodModerateExcellent

68. Surface Engineering Selection Guide

ApplicationRecommended Finish
Electrical EquipmentTin Plated
Decorative HardwarePolished Brass
Architectural ProjectsSatin Brass
Marine ComponentsNickel Plated
TelecommunicationsTin Plated
InstrumentationNatural Brass

69. Traceability and Production Control

SM Fasteners integrates traceability throughout manufacturing via:

  • Heat number control
  • Batch identification
  • Process routing documentation
  • Inspection records
  • Final product verification

This ensures consistent quality and compliance with project specifications and procurement requirements.

70. SM Fasteners Manufacturing Capability

SM Fasteners supports production of:

  • Brass bolts
  • Brass nuts
  • Brass screws
  • Brass washers
  • Brass threaded rods
  • Brass inserts
  • Brass rings
  • Precision CNC components
  • Custom-engineered fastening solutions

Available alongside advanced material offerings including:

  • Stainless Steel
  • Duplex Stainless Steel
  • Super Duplex Stainless Steel
  • Hastelloy
  • Inconel
  • Incoloy
  • Monel
  • Nickel Alloys
  • SMO 254
  • PEEK Fasteners

All products are manufactured under documented quality systems aligned with ISO 9001 requirements and industrial procurement expectations.

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