Stainless Metric Socket Head Cap Screws
A2 stainless steel metric socket head cap screws (Allen bolts), DIN 912, standard pitch, from M2 to M24: M2 x 0.4, M2.5 x 0.45, M3 x 0.5, M4 x 0.7, M5 x 0.8, M6 x 1.0, M8 x 1.25, M10 x 1.5, M12 x 1.75, M16 x 2.0, M20 x 2.5, M24 x 3.0. Lengths from 4mm to 150mm. Choose a size below.
Specifications
- Material: A2 stainless steel
- Standard: DIN 912
- Drive: hex socket
- Sizes: M2 to M24, standard pitch
- Type 316 (A4) stainless available, please contact us

DIN 912
A2 Stainless Steel

| d | M2 | M2.5 | M3 | M4 | M5 | M6 | M8 | M10 | M12 | M16 | M20 | M24 |
| dk | 3.62 | 4.32 | 5.32 | 6.78 | 8.28 | 9.78 | 12.73 | 15.73 | 17.73 | 23.67 | 29.67 | 35.61 |
| e | 1.73 | 2.3 | 2.87 | 3.44 | 4.58 | 5.72 | 6.86 | 9.15 | 11.43 | 16 | 19.44 | 21.73 |
| k | 1.86 | 2.36 | 2.86 | 3.82 | 4.82 | 5.7 | 7.64 | 9.64 | 11.57 | 15.57 | 19.48 | 23.48 |
| s | 1.5 | 2 | 2.5 | 3 | 4 | 5 | 6 | 8 | 10 | 14 | 17 | 19 |
| pitch | 0.4 | .45 | 0.5 | .07 | .08 | 1.0 | 1.25 | 1.50 | 1.75 | 2.0 | 2.5 | 3.0 |
| Full Thread Length up to: (mm) | 20 | 25 | 20 | 25 | 25 | 30 | 35 | 40 | 50 | 60 |
Common Uses
- Machinery, jigs and fixtures
- Robotics and automation
- Marine and food equipment
FAQ
Why use socket head cap screws?
The round head is small and the hex socket lets you tighten in tight or counterbored spaces where a wrench won't fit.
What hex key fits?
M3 2.5mm, M4 3mm, M5 4mm, M6 5mm, M8 6mm, M10 8mm, M12 10mm, M16 14mm, M20 17mm, M24 19mm.
What is A2 stainless steel?
A2 is the metric (ISO 3506) name for 304 type stainless steel, the same family as 18-8. It resists rust outdoors, in wet areas and in washdown use. A4 is the 316 type, for salt water and chemicals.
How do I stop stainless threads from galling?
Stainless threads can seize (gall) when tightened fast or dry. Use an anti-seize compound, tighten at a slower speed, and do not over tighten.
Related: Stainless Metric Button Head Socket Cap Screws | Stainless Metric Flat Head Socket Cap Screws | Stainless Socket Head Cap Screws (inch) | Metric Socket Head Cap Screws
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