- The screws will generally conforms to IS : 2269, ISO 10642 and DIN 7991.
- Threads will confirm to class 4g6g of IS : 4218, Coarse Series.
- Material : Mita High Grade Alloy Steel.
- Heat Treatment : HRC 38 – 44.
- Propety Class : 12.9.
- Sizes in brackets are non-preferred standards.
- All dimensions are in millimeters.
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Physical Properties
| Ultimate Tensile Strength, Min. | 1,050 N/mm2 | 107 kgf/mm2 |
| Yield strength, 0.2% offset, Min. | 945 N/mm2 | 96.3 kgf/mm2 |
| Shear strength, Min. | 630 N/mm2 | 64.2 kgf/mm2 |
Elongation % on GL = 5.65 Where A = Cross sectional area |
9% mm2 | 9% Min. |
Socket Countersunk Head Screws Inch Series – Dimensions
| Thread Size | T.P.I. | A Max | F Min. | H Min. | R Ref. | W Nom. | L Max. | |
| BSW | BSF | |||||||
| 3/16 | 24 | 32 | 0.356 | 0.065 | 0.085 | 0.025 | 3/32 | 1 |
| 1/4 | 20 | 26 | 0.475 | 0.085 | 0.113 | 0.025 | 5/32 | 1 1/4 |
| 5/16 | 18 | 22 | 0.594 | 0.105 | 0.142 | 0.025 | 3/16 | 1 1/4 |
Physical Properties
| Ultimate Tensile Strength, Min. | 1,60,000 lbf/in2 |
| Yield strength, 0.2% offset, Min. | 1,44,000 lbf/in2 |
| Shear strength, Min. | 96,000 lbf/in2 |
| Elongation % on GL = 5.65 Where A = Cross sectional area |
9% Min. |