ISO 4762

Hexagon Socket Head Cap Screws (SHCS)

High-Strength Internal Hex Screws for Precision Engineering

Manufacturer & Exporter: Super Industries India

1. What is ISO 4762?

ISO 4762 specifies hexagon socket head cap screws, commonly known as Allen bolts. These screws are designed for applications where:

• High clamping force is required
• Space is limited
• A clean, flush assembly is preferred

ISO 4762 is one of the most widely used ISO fastener standards in mechanical engineering and automation.

2. Why Engineers Prefer ISO 4762

ISO 4762 screws are preferred over external hex bolts because they offer:

• Higher torque transmission
• Compact head design
• Better aesthetics
• Reduced risk of tool slippage

They are especially suitable for high-stress and high-precision assemblies.

3. Head & Drive Design

• Cylindrical head
• Internal hexagon drive
• Allows tightening using Allen keys or hex bits
• Enables higher preload than slotted or Phillips screws

4. Dimensional Overview

Typical size range:

• Thread sizes: M1.6 to M64
• Lengths: 3 mm to 300 mm (standard)
• Fully threaded or partially threaded (depending on length)

Head height and socket depth are strictly controlled under ISO 4762.

5. Thread Form & Pitch

• Metric ISO coarse thread (standard)
• Metric fine thread (available on request)
• Threads comply with ISO 965 tolerance system

6. Strength Grades (Mechanical Properties)

ISO 4762 screws are commonly supplied in:

Property Class	Tensile Strength	Yield Strength
8.8	800 MPa	640 MPa
10.9	1000 MPa	900 MPa
12.9	1200 MPa	1080 MPa

Super Industries India specializes in 10.9 and 12.9 grade socket head screws.

7. Materials Offered

• Carbon steel
• Alloy steel
• Stainless steel (A2-70, A4-80)
• Special alloy steel for critical applications

8. Heat Treatment

High-strength ISO 4762 screws undergo:

• Quenching & tempering
• Controlled hardness testing
• Microstructure verification

Typical hardness:

• Grade 12.9: 39–44 HRC

9. Surface Finishes

Available finishes include:

• Black oxide (standard)
• Zinc plated
• Phosphate coated
• Hot dip galvanized (limited sizes)
• Stainless natural finish

10. Torque & Preload Characteristics

Internal hex drive allows:

• Higher tightening torque
• Reduced cam-out
• Consistent preload

This makes ISO 4762 ideal for:

• Dynamic loads
• Vibration-prone environments

11. Comparison with Similar Standards

Standard	Difference
DIN 912	Legacy equivalent
ISO 4762	Global replacement
ISO 7380	Button head version
ISO 4017	External hex bolt

12. Design Advantages

✔ Compact head allows close spacing
✔ High fatigue resistance
✔ Clean appearance
✔ Compatible with recessed mounting

13. Common Engineering Applications

• CNC machines
• Industrial automation
• Robotics
• Injection molding machines
• Pumps & compressors
• Gearboxes

14. Installation Best Practices

• Use calibrated torque wrench
• Ensure clean socket
• Avoid worn Allen keys
• Apply thread locker if vibration exists

15. Failure Modes to Avoid

❌ Over-torquing
❌ Using low-grade keys
❌ Incorrect washer selection
❌ Mixing grades in assemblies

16. Washer & Nut Compatibility

Commonly used with:

• ISO 7089 flat washers
• Spring washers (if required)
• Thread-locking compounds instead of lock washers

17. Export Packaging & Supply

Super Industries India provides:

• Bulk export packaging
• Grade-wise segregation
• Heat number traceability
• OEM branding support

18. Custom Manufacturing Capabilities

• Non-standard lengths
• Special coatings
• Fine thread variants
• High-temperature materials

19. Industries Served

• Automotive & EV
• Heavy machinery
• Oil & gas equipment
• Industrial tooling
• Power generation

20. Conclusion

ISO 4762 socket head cap screws deliver superior strength, compactness, and precision, making them indispensable in modern engineering designs.

Super Industries India manufactures ISO 4762 fasteners to meet global engineering and export standards.