Cup head square neck bolts
GB12
Diameter range: M5-M16 Length range: 10mm-360mm
| standard | GB national standard |
|---|---|
| head shape | Round head square neck |
| Thread | Fully threaded |
| (mm) | M6 | M8 | M10 | M12 | M14 | M16 | M20 |
|---|---|---|---|---|---|---|---|
| P | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 |
| dk(max) | 13.1 | 17.1 | 21.3 | 25.3 | 29.3 | 33.6 | 41.6 |
| dk(min) | 11.3 | 15.3 | 19.16 | 23.16 | 27.16 | 31 | 39 |
| k1(max) | 4.4 | 5.4 | 6.4 | 8.45 | 9.45 | 10.45 | 12.55 |
| k1(min) | 3.6 | 4.6 | 5.6 | 7.55 | 8.55 | 9.55 | 11.45 |
| k(max) | 4.08 | 5.28 | 6.48 | 8.9 | 9.9 | 10.9 | 13.1 |
| k(min) | 3.2 | 4.4 | 5.6 | 7.55 | 8.55 | 9.55 | 11.45 |
| s(max) | 6.3 | 8.36 | 10.36 | 12.43 | 14.43 | 16.43 | 20.82 |
| s(min) | 5.84 | 7.8 | 9.8 | 11.76 | 13.76 | 15.76 | 19.22 |
| r(min) | 0.5 | 0.5 | 0.5 | 0.8 | 0.8 | 1 | 1 |
| ds(max) | 6 | 8 | 10 | 12 | 14 | 16 | 20 |
| ds(min) | 5.35 | 7.19 | 9.03 | 10.86 | 12.7 | 14.7 | 18.38 |
| steel | Stainless steel | ||
| General technical conditions | GB/T 16938 | ||
| Thread | tolerance | A2-70: 6g; others: 8g | |
| standard | GB/T 196、GB/T 197 | ||
| Mechanical properties | Grade | 4.6, 4.8 | A2-50、A2-70 |
| standard | GB/T 3098.1 | GB/T 3098.6 | |
| tolerance | Product grade | Except as provided in Chapter 3, Class C | |
| standard | GB/T 3103.1 | ||
| surface treatment | Without treatment; | Simple handling | |
| Electroplating technical requirements according to GB/T 5267.1 | |||
| If other surface treatment is required, it should be agreed upon by the supplier and the buyer. | |||
| Acceptance and packaging | GB/T 90.1、GB/T 90.2 | ||
