Set screws

1. Industry Context

Set screws are torque-transmitting and positional locking fasteners used where:

• Components must be secured without protruding heads
• Radial locking or axial positioning is required
• Space constraints prohibit conventional bolt-nut assemblies
• Repeatable precision alignment is critical

Unlike conventional screws designed to create clamping force between members, set screws function primarily as locking elements.

Primary Industrial Usage

Industry	Functional Role
Construction Equipment	Shaft locking, couplings
Oil & Gas	Valve stems, instrumentation retention
Power Generation	Turbine accessories
Petrochemical	Actuator positioning
Rail & Infrastructure	Gearbox assemblies
Heavy Machinery	Pulley & hub retention
Shipbuilding	Marine equipment alignment
Automotive OEM	Transmission components

SM Fasteners supplies set screws globally for OEM assemblies, EPC projects, and MRO environments requiring dimensional repeatability and certified material traceability.

2. Technical Definition

A Set Screw is defined as:

A headless threaded fastener designed to secure an object within or against another object, typically by applying compressive force via a tip configuration.

Key Characteristics:

• Fully threaded body
• No projecting head
• Driven internally (hex socket, slotted, Torx)
• Applies localized compressive force

3. Functional Role in Mechanical Assemblies

Set screws are primarily used to:

• Prevent relative motion
• Transmit torque
• Maintain axial positioning
• Eliminate backlash
• Lock rotating elements

Typical Assembly Example:

• Shaft + Hub + Set Screw
  → Screw tip presses against shaft → frictional locking created.

4. Load Mechanics & Force Behavior

4.1 Force Transmission Model

Set screw performance depends on:

1. Contact Force
2. Friction Coefficient
3. Material Hardness Interaction
4. Thread Engagement Length

Unlike bolts:

• Minimal tensile loading
• Dominant compressive + shear resistance

Contact Force Equation

$$F = \frac{T}{K \times d}$$

Where:

• F = Preload force
• T = Applied torque
• K = Nut factor (0.18–0.25)
• d = Nominal diameter

4.2 Torque–Tension Relationship

Only 10–15% of applied torque creates useful locking force.

Remaining torque losses:

Energy Loss	Approx %
Thread friction	40%
Tip friction	45%
Useful preload	15%

Engineering implication:

👉 Surface finish and lubrication dramatically affect locking reliability.

5. Joint Design Principles

5.1 Correct Design Approach

Engineers must consider:

• Shaft hardness vs screw hardness
• Contact geometry
• Dynamic loading
• Vibration exposure
• Thermal expansion

Recommended Shaft Hardness Matching

Screw Grade	Recommended Shaft Hardness
45H Steel	≤ 30 HRC
12.9 Alloy Steel	≤ 40 HRC
Stainless A4-80	≤ 28 HRC

5.2 Thread Engagement Rule

Minimum engagement length:$$L_e = 1.0D \text{ (steel)}$$

$$L_e = 1.5D \text{ (soft metals)}$$

Where D = nominal diameter

5.3 Point Contact Mechanics

Set screw tip type defines performance:

Tip Type	Behavior
Cup Point	General purpose
Cone Point	Permanent locking
Flat Point	Surface protection
Dog Point	Accurate positioning
Knurled Cup	Vibration resistance

6. Preload Calculation — Worked Example

Given:

• M8 set screw
• Torque = 18 Nm
• Nut factor K = 0.20
• Diameter = 8 mm

$$F=\frac{18}{0.20 \times 0.008}$$

$$F=11,250 N$$

Result: Approx. 11.2 kN locking force

7. Friction & Locking Efficiency

Critical parameters:

• Surface roughness Ra
• Coating friction coefficient
• Lubrication state
• Tip deformation behavior

Friction Coefficient Comparison

Condition	Coefficient
Dry Steel	0.20–0.25
Zinc Plated	0.16–0.20
MoS₂ Coated	0.08–0.12
PTFE Coated	0.05–0.10

8. Failure Mechanisms

8.1 Fatigue Failure

Occurs due to cyclic micro-movement.

Mitigation:

• Knurled cup points
• Proper torque control

8.2 Shear Failure

Common in torque-transmitting applications.$$\tau = \frac{F}{A}$$​

Where A = shear area.

8.3 Thread Stripping

Causes:

• Insufficient engagement
• Soft mating material
• Over-torque

8.4 Hydrogen Embrittlement

High-strength grades (>1000 MPa) vulnerable after electroplating.

SM Fasteners controls risk through:

• Post-bake procedures
• Process validation
• Hardness monitoring

8.5 Stress Corrosion Cracking

Typical environments:

• Chlorides
• H₂S
• Offshore marine service

Materials such as Duplex, Super Duplex, Inconel, SMO 254 supplied where required.

9. Engineering Selection Criteria

Parameter	Design Consideration
Load Type	Static / Dynamic
Environment	Corrosive / Offshore
Temperature	Cryogenic → High temp
Access	Internal drive requirement
Maintenance	Reusable vs permanent
Certification	NACE / EN / ASTM

10. Functional Advantages of Set Screws

• Flush mounting
• High positional accuracy
• Low mass
• Compact assemblies
• Simplified automation assembly

11. Product Types and Variants

Set screws are engineered in multiple configurations to satisfy mechanical retention, positioning accuracy, vibration resistance, and surface protection requirements across industrial assemblies.

SM Fasteners manufactures set screws across metric and imperial systems, including customized geometries for OEM and EPC project specifications.

11.1 Point Style Classification

Point Type	Mechanical Function	Typical Application	Locking Strength
Cup Point	Creates indentation for friction lock	General machinery	High
Cone Point	Penetrates shaft surface	Permanent positioning	Very High
Flat Point	Non-marring contact	Soft shafts	Medium
Dog Point	Positive location into hole	Indexing assemblies	High
Knurled Cup	Increased vibration resistance	Dynamic equipment	Very High
Oval Point	Reduced surface damage	Precision assemblies	Medium

Engineering Note:
Cup point set screws represent approximately 70–80% of industrial usage due to balanced locking performance and reusability.

11.2 Drive Types (Internal Engagement)

Drive Type	Torque Capacity	Industrial Preference
Hex Socket (Allen)	Excellent	Global standard
Torx / Star Drive	Very High	High-torque automation
Slotted	Low	Legacy equipment
Square Socket	Medium	Specialty applications
Hexalobular Security	Controlled	Restricted access assemblies

SM Fasteners primarily supplies hex socket drive set screws compliant with ISO and DIN standards for global interchangeability.

11.3 Functional Variant Classification

Variant	Description
Half Dog Point	Partial engagement for repeat positioning
Long Dog Point	Accurate alignment systems
Nylon Tip	Non-damage locking
Brass Tip	Electrical insulation
PEEK Tip	Chemical & cryogenic environments
Patch-locking	Pre-applied locking element

PEEK tipped set screws supplied by SM Fasteners are widely used in:

• Semiconductor equipment
• Chemical reactors
• High-purity systems
• LNG instrumentation

12. Dimensional Logic & Geometry

Set screw performance depends strongly on geometric relationships between:

• Diameter
• Thread pitch
• Length
• Drive depth
• Tip geometry

12.1 Standard Dimensional Parameters

Symbol	Parameter
d	Nominal Diameter
P	Thread Pitch
L	Length
s	Hex Socket Size
t	Socket Depth
dp	Point Length

12.2 Metric Set Screw Dimensions (ISO/DIN)

Size	Pitch (mm)	Socket Size (mm)	Typical Length Range (mm)
M3	0.5	1.5	3–20
M4	0.7	2	4–30
M5	0.8	2.5	5–40
M6	1.0	3	6–50
M8	1.25	4	8–60
M10	1.5	5	10–80
M12	1.75	6	12–100
M16	2.0	8	16–120
M20	2.5	10	20–150

All dimensional tolerances supplied by SM Fasteners conform to ISO tolerance classes 6g / 6H unless otherwise specified.

12.3 Imperial Thread Sizes

Size	UNC Pitch	UNF Pitch
#10	24	32
1/4″	20	28
5/16″	18	24
3/8″	16	24
1/2″	13	20
5/8″	11	18

13. Applicable International Standards

Set screws must comply with globally interchangeable standards to ensure EPC compatibility.

13.1 ISO Standards

Standard	Description
ISO 4026	Hex socket set screw — flat point
ISO 4027	Hex socket set screw — cone point
ISO 4028	Hex socket set screw — dog point
ISO 4029	Hex socket set screw — cup point
ISO 898-1	Mechanical properties carbon/alloy steel
ISO 3506	Stainless steel fasteners

13.2 DIN Standards

DIN Standard	Type
DIN 913	Flat point
DIN 914	Cone point
DIN 915	Dog point
DIN 916	Cup point

DIN and ISO versions are dimensionally interchangeable for international projects.

13.3 ASTM Standards

ASTM	Scope
ASTM F912/F912M	Alloy steel socket set screws
ASTM A193	High-temperature service alloys
ASTM A320	Low-temperature applications
ASTM F593	Stainless steel fasteners

13.4 British Standards (BS)

BS Standard	Description
BS 4168	Metric set screws
BS 2470	Imperial threaded fasteners

14. Property Class System (Metric)

Mechanical performance of set screws is governed by property class.

Property Class	Min Tensile Strength (MPa)	Typical Use
8.8	800	General machinery
10.9	1000	Heavy equipment
12.9	1200	High torque locking

SM Fasteners supplies certified property classes with hardness verification per ISO 898-1.

15. Thread Standards & Tolerances

Thread System Comparison

Thread Type	Standard	Application
Metric	ISO 261/965	Global industrial
UNC	ASME B1.1	North America
UNF	ASME B1.1	Precision assemblies
BSW	BS 84	Legacy equipment
BSF	BS 84	Fine thread British systems

Tolerance Classes

Class	Fit Description
6g	External thread standard
6H	Internal thread standard
4g6g	Precision assemblies
2A/2B	Unified threads

SM Fasteners ensures compatibility for multinational EPC installations.

16. Dimensional Tolerance Control

Critical inspection parameters:

• Major diameter
• Pitch diameter
• Minor diameter
• Socket depth
• Point concentricity

Tolerance verification performed through:

• Optical profile measurement
• GO/NO-GO gauges
• Coordinate measurement systems

17. Geometry Influence on Performance

Thread Pitch Influence

Pitch Type	Performance Effect
Coarse	Higher stripping resistance
Fine	Better vibration resistance
Extra Fine	Precision positioning

Length Selection Rule

Recommended:$$L \ge 1.5D$$

Ensures sufficient contact force without thread failure.

18. Interchangeability Considerations

Global projects require interchangeability between:

• ISO ↔ DIN
• ASTM ↔ Unified threads
• Metric ↔ Imperial equipment

SM Fasteners maintains:

• Dual-standard tooling
• Cross-standard verification
• Export-ready dimensional validation

19. Engineering Selection Matrix — Type vs Application

Application	Recommended Type
Shaft locking	Cup point
Permanent locking	Cone point
Precision alignment	Dog point
Soft material	Flat point
High vibration	Knurled cup
Chemical plants	Stainless / PEEK tip

20. Procurement Engineering Considerations

EPC buyers typically specify:

• Standard compliance
• Material grade
• Surface finish
• Heat treatment condition
• Traceability requirements

SM Fasteners supports project-specific customization, including:

• Non-standard lengths
• Special alloys
• Coating specification compliance
• Batch traceability aligned with ISO 9001 systems

21. Material Grades and Selection Criteria

Set screw performance is fundamentally governed by material metallurgy, influencing:

• Load capacity
• Wear resistance
• Corrosion behavior
• Temperature capability
• Galling resistance
• Service life reliability

SM Fasteners manufactures set screws across a full industrial metallurgy spectrum to support EPC, OEM, offshore, chemical, and power sector requirements.

21.1 Industrial Material Categories

Material Group	Typical Standards	Key Characteristics
Carbon Steel	ISO 898-1	High strength, economical
Alloy Steel	ASTM F912	Very high hardness capability
Stainless Steel	ISO 3506	Corrosion resistance
Duplex Stainless	ASTM A182 F51	Chloride resistance
Super Duplex	ASTM A182 F53/F55	Offshore service
Nickel Alloys	Inconel, Monel	Extreme environments
SMO 254	UNS S31254	Seawater resistance
PEEK Fasteners	ASTM D6262	Chemical & electrical insulation

22. Material Comparison Table

Material	UTS (MPa)	Yield (MPa)	Temp Limit	Corrosion Resistance	Relative Cost	Typical Applications
Carbon Steel 8.8	800	640	300°C	Low	Low	General machinery
Alloy Steel 12.9	1220	1100	400°C	Low	Medium	Heavy equipment
SS 304 (A2-70)	700	450	425°C	Good	Medium	Industrial assemblies
SS 316 (A4-80)	800	600	450°C	Excellent	Medium-High	Marine & chemical
Duplex F51	750	550	300°C	Very High	High	Offshore
Super Duplex F55	895	650	300°C	Extreme	Very High	Subsea systems
Inconel 625	827	414	980°C	Extreme	Premium	LNG & turbines
Monel 400	550	240	480°C	Seawater resistant	High	Marine
SMO 254	680	300	400°C	Superior chloride	Premium	Desalination
PEEK	—	—	260°C	Chemical inert	High	Electronics/chemical

23. Material Selection Criteria

Engineering selection must consider:

Mechanical Requirements

• Required preload force
• Contact deformation
• Wear resistance at contact tip

Environmental Exposure

• Chlorides
• H₂S sour service
• Acids or solvents
• Marine atmosphere

Temperature Range

Service Condition	Recommended Material
Indoor machinery	Carbon steel
Marine	SS316 / Duplex
Offshore	Super Duplex
Cryogenic	Austenitic stainless
High temperature	Inconel/Incoloy
Chemical plants	SMO 254 / PEEK

SM Fasteners supports material selection review during EPC procurement stages.

24. NACE MR0175 / ISO 15156 Compliance

For sour service environments:

Key controls include:

• Hardness limitation (< 22 HRC typical)
• Controlled heat treatment
• PMI verification
• Material traceability

Applicable materials supplied:

• Duplex Stainless Steel
• Nickel Alloys
• Special stainless grades

25. Mechanical Properties — Grade Wise

Property Class	Tensile Strength (MPa)	Yield Strength (MPa)	Hardness Range
8.8	800	640	22–32 HRC
10.9	1040	940	32–39 HRC
12.9	1220	1100	39–44 HRC
A2-70	700	450	≤ 25 HRC
A4-80	800	600	≤ 30 HRC

26. Heat Treatment Processes

Heat treatment determines strength, toughness, and fatigue resistance.

26.1 Heat Treatment Flow

1. Austenitizing
2. Quenching
3. Tempering
4. Stress Relieving
5. Hardness Verification

26.2 Process Impact

Process	Effect
Quenching	Strength increase
Tempering	Toughness restoration
Case hardening	Surface wear resistance
Solution annealing	Corrosion resistance restoration

SM Fasteners controls furnace parameters through calibrated systems under ISO 9001 procedures.

Hardness Control (Critical)

Application	Max Hardness
Standard service	44 HRC
Sour service	≤22 HRC
Stainless fasteners	Controlled cold work

27. End-to-End Manufacturing Workflow

SM Fasteners follows a fully traceable manufacturing sequence.

27.1 Raw Material Verification

• Mill Test Certificate verification
• Chemical composition testing
• Ultrasonic inspection (when required)
• Heat number assignment

27.2 Forming Process

Cold Heading (Preferred)

• Grain flow continuity
• High fatigue strength
• Material efficiency

CNC Machining

Used for:

• Exotic alloys
• Custom geometries
• Low-volume EPC orders

27.3 Thread Manufacturing

Method	Advantage
Thread Rolling	Increased strength, better fatigue
Thread Cutting	Suitable for hard alloys

SM Fasteners prioritizes rolled threads wherever metallurgy permits.

27.4 Tip Formation

• Precision grinding
• Automated forming dies
• Point concentricity inspection

27.5 Heat Treatment

Performed in:

• Controlled atmosphere furnaces
• Batch traceability maintained
• Temperature uniformity surveys conducted

27.6 Final Cleaning

• Ultrasonic cleaning
• Degreasing
• Surface preparation before coating

28. Surface Finishing & Coating Technologies

Surface engineering directly impacts:

• Corrosion resistance
• Torque coefficient
• Galling resistance
• Service life

Surface Finish Comparison Table

Coating	Corrosion Protection	Friction	Temperature Limit	Typical Use
Black Oxide	Low	Medium	300°C	Machinery
Zinc Plated	Moderate	Medium	120°C	General industry
Hot Dip Galvanized	High	High	200°C	Structural
Mechanical Galvanized	Medium	Medium	150°C	Infrastructure
Phosphate	Low	Low friction	250°C	Automotive
PTFE/Xylan	Excellent	Very Low	260°C	Offshore
Dacromet/Geomet	High	Controlled	300°C	EPC projects
Nickel Plating	Moderate	Smooth	400°C	Wear resistance
Passivation (SS)	Excellent	Stable	450°C	Chemical plants

29. Corrosion Resistance vs Environment

Environment	Recommended Material/Finish
Indoor dry	Black oxide
Outdoor industrial	Zinc plated
Marine atmosphere	SS316 / Duplex
Offshore splash zone	Super Duplex + PTFE
Acidic chemical	Nickel alloy
H₂S sour service	NACE compliant alloy
High humidity	Passivated stainless
Food/pharma	Electropolished stainless

30. Galling Prevention Strategy

Particularly important for stainless steel set screws.

Mitigation methods:

• MoS₂ lubrication
• Silver coating
• PTFE coating
• Controlled torque application
• Material pairing strategy

31. Hydrogen Embrittlement Control

SM Fasteners implements:

• Baking after electroplating
• Process timing control
• Hardness monitoring
• Coating process qualification

Critical for property class 10.9 and 12.9 fasteners.

32. Advanced Materials Capability — SM Fasteners

Available specialty fasteners:

• Duplex & Super Duplex
• Inconel 625 / 718
• Monel 400
• Hastelloy grades
• SMO 254
• Titanium (project-specific)
• PEEK engineered fasteners

PEEK Set Screw Applications

Industry	Benefit
Semiconductor	Non-metallic contamination control
Chemical processing	Acid resistance
Electrical equipment	Insulation
Cryogenic LNG	Thermal stability
Medical equipment	Non-magnetic

33. Manufacturing Traceability System

Each production lot includes:

• Heat number marking
• Batch identification
• Process history tracking
• Inspection linkage

Integrated within SM Fasteners’ ISO 9001 quality framework.

34. Engineering Value Delivered by SM Fasteners

• Certified metallurgy control
• Advanced heat treatment validation
• Precision geometry consistency
• Coating performance optimization
• Export-grade manufacturing readiness

35. Inspection & Quality Control Philosophy

Set screws used in EPC, oil & gas, power, and heavy engineering applications must satisfy traceable mechanical integrity requirements, not merely dimensional acceptance.

SM Fasteners integrates inspection activities into an ISO 9001 certified manufacturing workflow, ensuring verification from raw material to final dispatch.

35.1 Quality Assurance Structure

Inspection is divided into:

Stage	Inspection Activity
Incoming Material	Chemical & dimensional verification
In-Process	Thread & geometry monitoring
Heat Treatment	Hardness and structure validation
Surface Finish	Coating thickness testing
Final Inspection	Mechanical & dimensional audit
Pre-Dispatch	Documentation verification

36. Dimensional Inspection

Critical parameters verified:

• Major diameter
• Pitch diameter
• Minor diameter
• Thread pitch accuracy
• Socket depth & hex size
• Point concentricity
• Length tolerance

Inspection tools used:

• GO / NO-GO gauges
• Optical comparators
• Digital profile measurement
• Coordinate Measuring Machines (CMM)

37. Mechanical Testing

Test	Standard	Purpose
Tensile Testing	ISO 898-1	Strength validation
Proof Load Test	ASTM F912	Functional capacity
Hardness Test	ISO 6508	Heat treatment verification
Torque Test	Internal spec	Drive integrity
Wedge Load Test	ISO method	Thread performance
Fatigue Testing	Project specific	Dynamic reliability

38. Non-Destructive Testing (NDT)

Applied when required by EPC or third-party inspection agencies.

Method	Application
MPI	Surface crack detection
DPI	Stainless & alloy fasteners
Ultrasonic Testing	Large diameter screws
Eddy Current	Surface integrity
PMI Testing	Alloy verification

39. Positive Material Identification (PMI)

Mandatory for:

• Duplex
• Super Duplex
• Nickel Alloys
• SMO 254
• Critical refinery projects

PMI ensures chemical composition compliance with purchase specifications.

40. Certification & Documentation

SM Fasteners supplies complete documentation packages aligned with global procurement standards.

Standard Documentation

• Mill Test Certificate (MTC)
• Heat Treatment Reports
• Hardness Reports
• Dimensional Inspection Reports
• Coating Compliance Reports
• Certificate of Conformity (CoC)

Certification Formats

Standard	Description
EN 10204 2.1	Declaration of compliance
EN 10204 3.1	Manufacturer verified certification
EN 10204 3.2	Third-party witnessed certification

41. Industry Applications Mapping

Industry	Application Function
Construction	Structural equipment positioning
Oil & Gas Upstream	Valve stems & instrumentation
Midstream	Pump & compressor couplings
Downstream Refining	Actuator assemblies
Power Generation	Turbine auxiliary locking
Petrochemical	Mixer & agitator shafts
LNG	Cryogenic instrumentation
Automotive	Gear & pulley retention
Railways	Drive systems
Shipbuilding	Marine propulsion equipment

PEEK Fastener Application Integration

Sector	Benefit
Electronics	Electrical insulation
Chemical Plants	Corrosion immunity
Semiconductor	Cleanroom compatibility
LNG Systems	Thermal stability

42. Failure Prevention Engineering

Common field failures and mitigation:

Failure Mode	Root Cause	Prevention
Loosening	Vibration	Knurled cup point
Galling	Stainless friction	PTFE/MoS₂ coating
Thread stripping	Low engagement	≥1D engagement
Tip deformation	Material mismatch	Correct hardness pairing
Corrosion seizure	Marine exposure	Duplex/Super Duplex
Hydrogen embrittlement	Improper plating	Controlled baking

43. Tightening Torque Chart

(Reference values — dry condition)

Size	Grade 8.8 (Nm)	Grade 10.9 (Nm)	Grade 12.9 (Nm)
M4	2.8	4	5
M5	5.5	8	10
M6	9	13	16
M8	22	32	40
M10	44	63	80
M12	76	108	135
M16	185	260	325
M20	360	510	640

Lubricated torque ≈ 70–80% of dry torque.

44. Proof Load & Tensile Strength Table

Size	Proof Load 8.8 (kN)	Proof Load 10.9 (kN)	Proof Load 12.9 (kN)
M6	8	10	12
M8	15	19	23
M10	24	30	36
M12	35	44	52
M16	68	85	102
M20	106	133	160

45. Thread Standards & Tolerances Table

Thread System	Standard	Tolerance
Metric	ISO 261	6g
Unified UNC	ASME B1.1	2A
Unified UNF	ASME B1.1	2A
BSW	BS 84	Medium
BSF	BS 84	Fine

46. Surface Finish Performance Comparison

Finish	Salt Spray Resistance	Friction Stability	Maintenance Requirement
Black Oxide	24 hrs	Stable	Indoor
Zinc Plated	72–120 hrs	Moderate	Medium
HDG	500+ hrs	High friction	Outdoor
Dacromet	1000+ hrs	Controlled	EPC
PTFE	Excellent	Low	Offshore
Passivated SS	Excellent	Stable	Chemical

47. Corrosion Resistance vs Environment Table

Environment	Recommended Solution
Urban	Zinc plated
Industrial	Phosphate coated
Marine	SS316 / Duplex
Offshore Splash	Super Duplex
Acidic	Hastelloy/Inconel
H₂S	NACE compliant
Cryogenic LNG	Austenitic SS / PEEK

48. Weight Chart — SM Fasteners Reference

(Approximate theoretical values)

Size	Weight/Piece (kg)	Weight/100 pcs (kg)
M4×10	0.002	0.20
M5×12	0.004	0.40
M6×16	0.007	0.70
M8×20	0.015	1.50
M10×25	0.028	2.80
M12×30	0.050	5.00
M16×40	0.110	11.0
M20×50	0.220	22.0

Weight charts align with SM Fasteners logistics and export packing calculations.

49. Preload Calculation Reference

Formula

$$F=\frac{T}{K \times d}$$

Where:

• F = Preload (N)
• T = Torque (Nm)
• K = Nut factor
• d = Nominal diameter (m)

Worked Example

M10 Grade 10.9
Torque = 63 Nm
K = 0.20
d = 0.010 m$$F=\frac{63}{0.20 \times 0.010}=31,500N$$

Preload ≈ 31.5 kN

50. Industrial Packaging & Export Readiness

SM Fasteners supplies global shipments compliant with EPC logistics practices.

Packaging Methods

• VCI corrosion protection bags
• Thread protection caps
• Oil or dry preservation options
• Batch traceability labels
• Barcoded identification

Export Packaging

• ISPM-15 certified wooden crates
• Moisture barrier wrapping
• Vacuum packing (project specific)
• Palletized container loading

51. Global Supply & Project Execution Capability

SM Fasteners supports:

• EPC bulk supply programs
• OEM annual contracts
• Shutdown & turnaround requirements
• Custom engineered fasteners
• Multi-material project packages

Supported Industries

• Oil & Gas
• LNG Projects
• Power Plants
• Refineries
• Offshore Platforms
• Infrastructure & Rail
• Heavy Machinery OEMs
• Shipbuilding

52. Integration with ISO 9001 Quality System

SM Fasteners quality framework ensures:

• Controlled procedures
• Risk-based thinking
• Continuous improvement
• Calibration management
• Supplier qualification
• Document traceability

Certified under:

• ISO 9001
• MSME Registration
• UKAF Accreditation

53. Engineering Summary — Set Screws

Set screws remain critical precision components enabling:

• Accurate mechanical positioning
• Reliable torque transmission
• Compact assembly design
• High vibration resistance
• Repeatable maintenance operations

Through controlled metallurgy, precision manufacturing, certified inspection systems, and export-ready logistics, SM Fasteners delivers set screws suitable for global EPC and industrial environments.

Set screws are headless threaded fasteners designed to secure components such as gears, pulleys, hubs, collars, and couplings onto shafts by applying localized compressive force. Unlike conventional screws, they function through mechanical locking and positioning rather than clamping two separate parts.

From an engineering perspective, set screws operate by generating controlled preload and frictional resistance, preventing rotational or axial movement under static or dynamic loads. Performance depends on correct selection of:

• Point style (cup, cone, flat, dog)
• Material grade and hardness
• Thread engagement length
• Torque application and preload control
• Environmental compatibility

SM Fasteners manufactures set screws compliant with ISO, DIN, ASTM, and BS standards, available in:

• Carbon steel and alloy steel (Grades 8.8, 10.9, 12.9)
• Stainless steels (A2, A4)
• Duplex & Super Duplex alloys
• Nickel alloys (Inconel, Monel, Hastelloy)
• SMO 254 and advanced PEEK engineered fasteners

Manufacturing includes cold forming or precision machining, thread rolling, controlled heat treatment, surface coating, and full inspection traceability under ISO 9001 quality systems.

Typical applications span:

• Oil & Gas equipment
• Power generation systems
• Petrochemical plants
• Heavy machinery & OEM assemblies
• Offshore and marine installations
• Rail, infrastructure, and LNG projects

Each supply batch can include MTC, inspection reports, hardness verification, PMI testing, and EN 10204 certification, ensuring global EPC procurement readiness.

In essence:
Set screws from SM Fasteners provide precision positioning, vibration-resistant locking, and reliable performance across critical industrial assemblies requiring certified quality and international standards compliance.