Metric Socket Head Cap Screws
Class 12.9 alloy steel metric socket head cap screws made to DIN 912, black oxide finish, from M2 x 0.4 to M30 x 3.5 in lengths from 3mm to 300mm. The strongest standard metric screw, with a hex socket for tight spaces. Choose a size below.
Specifications
- Strength: Class 12.9, 1,220 MPa (about 177,000 psi) tensile
- Standard: DIN 912
- Sizes: M2 to M30, standard pitch
- Finish: black oxide
Common Uses
- Machine tools, dies and fixtures
- Automation, robotics and 3D printers
- Motorcycle and car engines
FAQ
What do Class 8.8, 10.9 and 12.9 mean?
The first number x 100 is the minimum tensile strength in MPa, and the second number is the yield ratio. Class 8.8 is 800 MPa (about 116,000 psi), 10.9 is 1,040 MPa (about 150,000 psi) and 12.9 is 1,220 MPa (about 177,000 psi). Class 8.8 is often compared to SAE Grade 5 and 10.9 to Grade 8.
What hex key fits a metric socket head cap screw?
DIN 912: M3 2.5mm, M4 3mm, M5 4mm, M6 5mm, M8 6mm, M10 8mm, M12 10mm, M16 14mm, M20 17mm, M24 19mm.
Does black oxide prevent rust?
Only lightly. Black oxide with an oil film is for indoor, dry use. For wet or outdoor use, choose stainless steel socket screws.
Related: Metric Button Head Socket Cap Screws | Metric Flat Head Socket Cap Screws | Metric Socket Set Screws | Stainless Metric Socket Head Cap Screws
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