Hexagon socket head machine screws
GB70.2
Diameter range: M3-M8 Length range: 4mm-100mm
| standard | GB national standard |
|---|---|
| Groove | Hexagon socket |
| head shape | Flat round head |
| Thread | Partial / Full Thread |
| (mm) | M3 | M4 | M5 | M6 | M8 | M10 | M12 | M16 |
|---|---|---|---|---|---|---|---|---|
| P | 0.35|0.5 | 0.5|0.7 | 0.5|0.8 | 0.75|1 | 1|1.25 | 1|1.25|1.5 | 1|1.25|1.5|1.75 | 1|1.5|2 |
| da(max) | 3.6 | 4.7 | 5.7 | 6.8 | 9.2 | 11.2 | 13.7 | 17.7 |
| dk(max) | 5.7 | 7.6 | 9.5 | 10.5 | 14 | 17.5 | 21 | 28 |
| dk(min) | 5.4 | 7.24 | 9.14 | 10.07 | 13.57 | 17.07 | 20.48 | 27.48 |
| e(min) | 2.303 | 2.873 | 3.443 | 4.583 | 5.723 | 6.863 | 9.149 | 11.429 |
| k(max) | 1.65 | 2.2 | 2.75 | 3.3 | 4.4 | 5.5 | 6.6 | 8.8 |
| k(min) | 1.4 | 1.95 | 2.5 | 3 | 4.1 | 5.2 | 6.24 | 8.44 |
| r(min) | 0.1 | 0.2 | 0.2 | 0.25 | 0.4 | 0.4 | 0.6 | 0.6 |
| s(max) | 2.08 | 2.58 | 3.08 | 4.095 | 5.14 | 6.14 | 8.175 | 10.175 |
| s(min) | 2.02 | 2.52 | 3.02 | 4.02 | 5.02 | 6.02 | 8.025 | 10.025 |
| t(min) | 1.04 | 1.3 | 1.56 | 2.08 | 2.6 | 3.12 | 4.16 | 5.2 |
| steel | Stainless steel | ||
| General technical conditions | GB/T 16938 | ||
| Thread | tolerance | 12.9: 5g6g; | |
| Other grades: 6g | |||
| standard | GB/T 193、GB/T 9145 | ||
| Mechanical properties | Performance level | 8.8, 10.9, 12.9/12.9a | A2-70、A4-70、A2-80、A4-80、A5-70、A3-70、A3-80、A5-80 |
| standard | GB/T 3098.1b | GB/T 3098.6c | |
| tolerance | Product grade | A | |
| standard | GB/T 3103.1 | ||
| surface treatment | Without treatment; | Simple handling; | |
| platingdTechnical requirements are in accordance with GB/T 5267.1; | Technical requirements for stainless steel passivation treatment GB/T 5267.4 | ||
| Technical requirements for non-electrolytic zinc flake coating according to GB/T 5267.2 | |||
| If other technical requirements or surface treatment are required, it should be agreed upon by the supplier and the buyer. | |||
| surface defects | 12.9/12.9 grade according to GB/T 5779.3; | - | |
| Others according to GB/T 5267.1 | |||
| Acceptance and packaging | GB/T 90.1、GB/T 90.2 | ||
