Hexagon socket countersunk machine screw
GB70.3
Diameter range: M3-M10 Length range: 4mm-120mm
| standard | GB national standard |
|---|---|
| Groove | Hexagon socket |
| head shape | sunken head |
| Thread | Partial / Full Thread |
| (mm) | M2 | M2.5 | M3 | M4 | M5 | M6 | M8 | M10 | M12 | M14 | M16 | M20 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| P | 0.4 | 0.45 | 0.5 | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 |
| dk(max) | 4.7 | 5.88 | 6.72 | 8.96 | 11.21 | 13.44 | 17.92 | 22.4 | 26.88 | 30.8 | 33.6 | 40.32 |
| dk(min) | 3.7 | 4.8 | 5.54 | 7.53 | 9.43 | 11.34 | 15.24 | 19.22 | 23.12 | 26.52 | 29.01 | 36.05 |
| e(min) | 1.5 | 1.733 | 2.303 | 2.873 | 3.443 | 4.583 | 5.723 | 6.863 | 9.149 | 11.429 | 11.429 | 13.716 |
| k(max) | 1.35 | 1.69 | 1.86 | 2.48 | 3.1 | 3.72 | 4.96 | 6.2 | 7.44 | 8.4 | 8.8 | 10.16 |
| k(min) | 1.13 | 1.408 | 1.522 | 2.121 | 2.669 | 3.218 | 4.366 | 5.563 | 6.711 | 7.588 | 7.874 | 9.037 |
| s(max) | 1.36 | 1.56 | 2.08 | 2.58 | 3.08 | 4.095 | 5.14 | 6.14 | 8.175 | 10.175 | 10.175 | 12.212 |
| s(min) | 1.32 | 1.52 | 2.02 | 2.52 | 3.02 | 4.02 | 5.02 | 6.02 | 8.025 | 10.025 | 10.025 | 12.032 |
| t(max) | 0.85 | 1.15 | 1.25 | 1.65 | 2 | 2.5 | 3.2 | 3.9 | 4.9 | 5.1 | 5.4 | 6.4 |
| t(min) | 0.75 | 1 | 1.1 | 1.4 | 1.75 | 2.2 | 2.9 | 3.5 | 4.3 | 4.5 | 4.8 | 5.6 |
| steel | Stainless steel | ||
| General technical conditions | GB/T 16938 | ||
| Thread | tolerance | 6g | |
| standard | GB/T 197 | ||
| Mechanical properties | Performance level | 8.8, 10.9, 12.9b | A2-50、A4-50； |
| A2-70、A4-70； | |||
| A2-80、A4-80 | |||
| standard | GB/T 3098.1c | GB/T 3098.6c | |
| code name | 08.8、010.9、012.9 | A2-050、A4-050 | |
| A2-070、A4-070 | |||
| A2-080、A4-080d | |||
| tolerance | Product grade | A | |
| standard | GB/T 3103.1 | ||
| surface treatment | Untreated (no coating/plating); | Simple treatment (cleaning and polishing); | |
| Electroplating technical requirements shall comply with GB/T 5267.1; | passivatione | ||
| 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 | GB/T 5779.1: 8.8, 10.9; | - | |
| GB/T 5779.3f: 12.9 | |||
| Acceptance and packaging | GB/T 90.1、GB/T 90.2 | ||
