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Socket Cap Spec Table
Socket Cap KS Specifications — 21 sizes
ISO 4762
ISOSocket Cap
21 sizes| Nominal | Hex Key (mm) | Head Dia (mm) | Head Height (mm) | Standard | - |
|---|---|---|---|---|---|
| M3 | 2.5 | 5.5 | 3 | ISO 4762 | - |
| M4 | 3 | 7 | 4 | ISO 4762 | - |
| M5 | 4 | 8.5 | 5 | ISO 4762 | - |
| M6 | 5 | 10 | 6 | ISO 4762 | - |
| M8 | 6 | 13 | 8 | ISO 4762 | - |
| M10 | 8 | 16 | 10 | ISO 4762 | - |
| M12 | 10 | 18 | 12 | ISO 4762 | - |
| M14 | 12 | 21 | 14 | ISO 4762 | - |
| M16 | 14 | 24 | 16 | ISO 4762 | - |
| M18 | 14 | 27 | 18 | ISO 4762 | - |
| M20 | 17 | 30 | 20 | ISO 4762 | - |
| M22 | 17 | 33 | 22 | ISO 4762 | - |
| M24 | 19 | 36 | 24 | ISO 4762 | - |
| M27 | 19 | 40 | 27 | ISO 4762 | - |
| M30 | 22 | 45 | 30 | ISO 4762 | - |
| M33 | 24 | 50 | 33 | ISO 4762 | - |
| M36 | 27 | 54 | 36 | ISO 4762 | - |
| M39 | 27 | 58 | 39 | ISO 4762 | - |
| M42 | 32 | 63 | 42 | ISO 4762 | - |
| M45 | 32 | 68 | 45 | ISO 4762 | - |
| M48 | 36 | 72 | 48 | ISO 4762 | - |
This specification follows ISO (International Organization for Standardization) standards. ISO ensures cross-border compatibility, making it ideal for multinational projects, export equipment design, and global parts procurement.
Hex-key (Allen) size reference for ISO 4762 (KS B 1003 / DIN 912) socket head cap screws from M3 to M48. Head diameter and height are included to support counterbore design and tool sourcing. Using a slightly undersized hex key permanently widens the socket and ruins the bolt — always use the matching size: M5 → 4 mm, M8 → 6 mm, M10 → 8 mm, M12 → 10 mm.