Large round head square neck bolts
GB14
Diameter range: M6-M16 Length range: 16mm-150mm
| standard | GB national standard |
|---|---|
| head shape | Round head square neck |
| Thread | Fully threaded |
| (mm) | M5 | M6 | M8 | M10 | M12 | M16 | M20 |
|---|---|---|---|---|---|---|---|
| P | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2.5 |
| dk(max) | 13 | 16 | 20 | 24 | 30 | 38 | 46 |
| dk(min) | 11.9 | 14.9 | 18.7 | 22.7 | 28.7 | 36.4 | 44.4 |
| ds(max) | 5.48 | 6.48 | 8.58 | 10.58 | 12.7 | 16.7 | 20.84 |
| ds(min) | 4.48 | 5.35 | 7.19 | 9.03 | 10.86 | 14.7 | 18.38 |
| e(min) | 5.9 | 7.2 | 9.6 | 12.2 | 14.7 | 19.9 | 24.9 |
| k1(max) | 4.1 | 4.6 | 5.6 | 6.6 | 8.8 | 12.9 | 15.9 |
| k1(min) | 2.9 | 3.4 | 4.4 | 5.4 | 7.2 | 11.1 | 14.1 |
| k(max) | 3.1 | 3.6 | 4.8 | 5.8 | 6.8 | 8.9 | 10.9 |
| k(min) | 2.5 | 3 | 4 | 5 | 6 | 8 | 10 |
| r(max) | 0.4 | 0.5 | 0.8 | 0.8 | 1.2 | 1.2 | 1.6 |
| s(max) | 5.48 | 6.48 | 8.58 | 10.58 | 12.7 | 16.7 | 20.84 |
| s(min) | 4.52 | 5.52 | 7.42 | 9.42 | 11.3 | 15.3 | 19.16 |
| steel | Stainless steel | ||
| General technical conditions | GB/T 16938 | ||
| Thread | tolerance | 8.8, A2-70: 6g; others: 8g | |
| standard | GB/T 196、GB/T 197 | ||
| Mechanical properties | Grade | 4.6, 4.8, 8.8 | 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 shall comply with GB/T 5267.1; | |||
| Hot dip galvanizing technical requirements according to GB/T 5267.3 | |||
| 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 | ||
