Socket Head Cap Screws Metric Series - M3 - M42 - Dimensions Note: 1. The screws will generally conforms to IS : 2269, ISO 4762, and DIN 912. 2. Threads will confirm to class 4g6g of IS : 4218, Coarse Series. 3. Material : Mita High Grade Alloy Steel. 4. Heat Treatment : HRC 38 - 44. 5. Propety Class : 12.9. 6. Sizes in brackets are non-preferred standards. 7. All dimensions are in millimeters.