Torx countersunk machine screws
GB2673
Diameter range: M1.4-M12 Length range: 3mm-120mm
| standard | GB national standard |
|---|---|
| head shape | sunken head |
| Groove | plum blossom trough |
| 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) | 11.3 | 15.8 | 18.3 | 22 | 25.5 | 29 | 36 |
| dk(min) | 10.9 | 15.4 | 17.8 | 21.5 | 25 | 28.5 | 35.4 |
| k(max) | 3.3 | 4.65 | 5 | 6 | 7 | 8 | 10 |
| No. | T30 | T40 | T50 | T55 | T55 | T60 | T80 |
| e | 5.6 | 6.75 | 8.95 | 11.358 | 11.35 | 13.45 | 17.75 |
| t(max) | 1.8 | 2.5 | 2.7 | 3.5 | 3.7 | 4.1 | 6 |
| t(min) | 1.4 | 2.1 | 2.3 | 3.02 | 3.22 | 3.62 | 5.42 |
| steel | Stainless steel | nonferrous metals | ||
| General technical conditions | ISO 8992 | |||
| Thread | tolerance | 6g | ||
| standard | GB/T 193、GB/T 9145 | |||
| Mechanical properties | Grade | 4.8 | A2-70、A3-70 | CU2、CU3 |
| standard | GB/T 3098.1 | GB/T 3098.6 | GB/T 3098.10 | |
| tolerance | Product grade | A | ||
| standard | GB/T 3103.1 | |||
| Hexagonal flower shape | standard | ISO 10664 | ||
| surface defects | GB/T 5779.1 | - | ||
| surface treatment | Without surface treatment; | Simple handling | Simple handling; | |
| Electroplating: technical requirements are in accordance with GB/T 5267.1; | Electroplating, technical requirements according to GB/T 5267.1 | |||
| Non-electrolytic zinc flake coating, technical requirements according to GB/T 5267.2 | ||||
| If other surface treatment is required, it should be agreed upon by both parties. | ||||
| Acceptance and packaging | GB/T 90.1、GB/T 90.2 | |||
