دليل شامل لبراغي رأس المقبس.
What Are Socket Head Cap Screws?
Content coming soon.
Socket Screw Variants
Content coming soon.
| Type | Head Height | Drive | Best Use |
|---|---|---|---|
| Socket Head Cap (SHCS) | 1.5×D | Hex socket | Standard high-strength joints |
| Socket Button Head | 0.75×D | Hex socket | Low profile decorative |
| Socket Flat Head | Flush | Hex socket | Flush mounting in precision work |
| Socket Shoulder Bolt | Shoulder×D | Hex socket | Pivot points, axles |
| Socket Set Screw | No head | Hex socket | Locking onto shafts |
| Low Head Cap Screw | 1.0×D | Hex socket | Limited clearance |
Sizes and Torque Specifications
Content coming soon.
| Size | Socket Size (mm) | Torque (12.9 Grade) | Torque (10.9 Grade) |
|---|---|---|---|
| M4 | 3 | 4.5 N·m | 3.5 N·m |
| M5 | 4 | 9.5 N·m | 7.5 N·m |
| M6 | 5 | 16 N·m | 12.5 N·m |
| M8 | 6 | 38 N·m | 30 N·m |
| M10 | 8 | 75 N·m | 60 N·m |
| M12 | 10 | 130 N·m | 105 N·m |
| M16 | 14 | 320 N·m | 260 N·m |
| M20 | 17 | 630 N·m | 510 N·m |
Industrial Applications in Africa
Content coming soon.
Installation: Proper Use of Allen Keys
Content coming soon.
Frequently Asked Questions
See frequently asked questions below.
What's the difference between Grade 10.9 and Grade 12.9 socket head cap screws?
Both are high-strength alloy steel. Grade 12.9 has minimum tensile strength of 1200 MPa vs 1040 MPa for Grade 10.9, and yield strength of 1100 MPa vs 940 MPa. Grade 12.9 also has a dark gray phosphate coating as standard while 10.9 is typically zinc-plated. For critical high-stress machinery connections (engines, gearboxes, cranes), use Grade 12.9. For general industrial equipment, Grade 10.9 is adequate and more cost-effective.
Can socket head cap screws be used with nuts?
Yes, socket head cap screws can be used with nuts as an alternative to hex bolts. However, since the screw head is designed to bear directly on the joint material (not a nut), using a socket head cap screw with a nut is less efficient than using a proper hex bolt or machine screw with a nut. Socket head cap screws are designed for female thread engagement in a tapped hole.
Why do socket cap screws seize or strip during installation?
The most common causes of socket stripping are: incorrect allen key size causing cam-out and rounding; over-torquing beyond the screw's yield strength; cross-threading during initial engagement; corrosion or debris in the threads. Always use the correct size tool, apply lubricant, start threading by hand to verify alignment, and use a torque wrench for critical applications.
Need socket head cap screws for your machinery? Get a factory quote from TradeGo.
Get Quote