Cross hexagon head recessed machine screws
GB29.2
Diameter range: M3-M10 Length range: 5mm-100mm
| standard | GB national standard |
|---|---|
| Groove | Cross recess |
| head shape | Hexagon (double chamfer) |
| Thread | Fully threaded |
| (mm) | M4 | M5 | M6 | M8 |
|---|---|---|---|---|
| P | 0.7 | 0.8 | 1 | 1.25 |
| da(max) | 4.7 | 5.7 | 6.8 | 9.2 |
| e(min) | 7.5 | 8.53 | 10.89 | 14.2 |
| k(max) | 3 | 3.74 | 4.24 | 5.54 |
| k(min) | 2.6 | 3.26 | 3.76 | 5.06 |
| s(max) | 7 | 8 | 10 | 13 |
| s(min) | 6.64 | 7.64 | 9.64 | 12.57 |
| r(min) | 0.2 | 0.2 | 0.25 | 0.4 |
| No. | 2 | 2 | 3 | 3 |
| M | 4 | 4.8 | 6.2 | 7.2 |
| t(max) | 1.93 | 2.73 | 2.86 | 3.86 |
| t(min) | 1.4 | 2.19 | 2.31 | 3.24 |
| steel | ||
| General technical conditions | GB/T 16938 | |
| Thread | tolerance | 6g |
| standard | GB/T 196、GB/T 197 | |
| Mechanical properties | Grade | 5.8 |
| standard | GB/T 3098.1 | |
| tolerance | Product grade | Except for the provisions in Chapter 3, the rest are classified as Class A |
| standard | GB/T 3103.1 | |
| Cross recess | H type GB/T 944.1 | |
| surface treatment | Without treatment; | |
| Electroplating technical requirements shall comply with GB/T 5267.1; | ||
| If other surface treatment is required, it should be agreed upon by the supplier and the buyer. | ||
| surface defects | GB/T 5779.1 | |
| Acceptance and packaging | GB/T 90.1、GB/T 90.2 | |
