Reference plates for the fasteners BIS commonly supplies. Drawings are schematic and not to scale; the current governing standard and approved project drawing always take precedence.
Common ISO metric coarse reference values for the fastener sizes most often specified. Use the current standard for tolerances, corner radii, chamfers, thread limits and acceptance.
| Size | Pitch | Hex head s | Head k | ISO 4032 nut m | ISO 7089 ID d1 | Washer OD d2 | Washer t |
|---|---|---|---|---|---|---|---|
| M6 | 1 | 10 | 4 | 5.2 | 6.4 | 12 | 1.6 |
| M8 | 1.25 | 13 | 5.3 | 6.8 | 8.4 | 16 | 1.6 |
| M10 | 1.5 | 16 | 6.4 | 8.4 | 10.5 | 20 | 2 |
| M12 | 1.75 | 18 | 7.5 | 10.8 | 13 | 24 | 2.5 |
| M14 | 2 | 21 | 8.8 | 12.8 | 15 | 28 | 2.5 |
| M16 | 2 | 24 | 10 | 14.8 | 17 | 30 | 3 |
| M18 | 2.5 | 27 | 11.5 | 15.8 | 19 | 34 | 3 |
| M20 | 2.5 | 30 | 12.5 | 18 | 21 | 37 | 3 |
| M22 | 2.5 | 34 | 14 | 19.4 | 23 | 39 | 3 |
| M24 | 3 | 36 | 15 | 21.5 | 25 | 44 | 4 |
| M27 | 3 | 41 | 17 | 23.8 | 28 | 50 | 4 |
| M30 | 3.5 | 46 | 18.7 | 25.6 | 31 | 56 | 4 |
| M36 | 4 | 55 | 22.5 | 31 | 37 | 66 | 5 |
| M42 | 4.5 | 65 | 26 | 34 | 45 | 78 | 8 |
| M48 | 5 | 75 | 30 | 38 | 52 | 92 | 8 |
| M56 | 5.5 | 85 | 35 | 45 | 62 | 105 | 10 |
| M64 | 6 | 95 | 40 | 51 | 70 | 115 | 10 |
Reference rule: these sheets summarize common standards and BIS supply capability. They are not substitutes for the current ISO/DIN/ASTM/IS standard, approved drawing or project specification.