Cross countersunk machine screw
GB819
Diameter range: M1-M12 Length range: 2mm-200mm
| standard | GB national standard |
|---|---|
| Groove | Cross recess |
| head shape | pan head |
| Thread | Fully threaded |
| (mm) | M1.6 | M2 | M2.5 | M3 | M4 | M5 | M6 | M8 | M10 |
|---|---|---|---|---|---|---|---|---|---|
| P | 0.35 | 0.4 | 0.45 | 0.5 | 0.7 | 0.8 | 1 | 1.25 | 1.5 |
| dk(max) | 3 | 3.8 | 4.7 | 5.5 | 8.4 | 9.3 | 11.3 | 15.8 | 18.3 |
| dk(min) | 2.7 | 3.5 | 4.4 | 5.2 | 8 | 8.9 | 10.9 | 15.4 | 17.8 |
| k(max) | 1 | 1.2 | 1.5 | 1.65 | 2.7 | 2.7 | 3.3 | 4.65 | 5 |
| No. | 0 | 0 | 1 | 1 | 2 | 2 | 3 | 4 | 4 |
| M | 1.6 | 1.9 | 2.9 | 3.2 | 4.6 | 5.2 | 6.8 | 8.9 | 10 |
| t(max) | 0.9 | 1.2 | 1.8 | 2.1 | 2.6 | 3.2 | 3.5 | 4.6 | 5.7 |
| t(min) | 0.6 | 0.9 | 1.4 | 1.7 | 2.1 | 2.7 | 3 | 4 | 5.1 |
| steel | ||
| Thread | tolerance | 6g |
| standard | GB/T 196 - 1981、GB/T 197 - 1981 | |
| Mechanical properties | Grade | 4.8 |
| standard | GB/T 3098.1 - 1982 | |
| tolerance | Product grade | A |
| standard | GB/T 3103.1 - 1982 | |
| Cross recess | GB/T 944.1 - 1985 | |
| Countersunk head measurement | GB/T 5279 - 1985 | |
| surface treatment | ① Without treatment; | |
| ②Galvanized passivation GB/T 5267 - 1985 | ||
| surface defects | GB/T 5779.1 - 1986 | |
| Acceptance and packaging | GB/T 90 - 1985 | |
