Plum countersunk head self tapping screws
GB2670.2
Diameter range: ST2-ST6.3 Length range: 4mm-100mm
| standard | GB national standard |
|---|---|
| head shape | sunken head |
| Groove | plum blossom trough |
| Thread | Fully threaded |
| (mm) | ST2.9 | ST3.5 | ST4.2 | ST4.8 | ST5.5 | ST6.3 |
|---|---|---|---|---|---|---|
| P | 1.1 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 |
| a | 1.1 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 |
| dk(max) | 5.5 | 7.3 | 8.4 | 9.3 | 10.3 | 11.3 |
| dk(min) | 5.2 | 6.9 | 8 | 8.9 | 9.9 | 10.9 |
| k(max) | 1.7 | 2.35 | 2.6 | 2.8 | 3 | 3.15 |
| No. | T10 | T15 | T20 | T25 | T25 | T30 |
| e | 2.8 | 3.35 | 3.95 | 4.5 | 4.5 | 5.6 |
| t(max) | 0.91 | 1.3 | 1.58 | 1.78 | 2.03 | 2.42 |
| t(min) | 0.65 | 1 | 1.14 | 1.39 | 1.65 | 2.02 |
| d(max) | 2.9 | 3.53 | 4.22 | 4.8 | 5.46 | 6.25 |
| d(min) | 2.76 | 3.35 | 4.04 | 4.62 | 5.28 | 6.03 |
| d1(max) | 2.18 | 2.64 | 3.1 | 3.58 | 4.17 | 4.88 |
| d1(min) | 2.08 | 2.51 | 2.95 | 3.43 | 3.99 | 4.7 |
| steel | ||
| General technical conditions | GB/T 16938 | |
| Thread | GB/T 5280 | |
| Mechanical properties | GB/T 3098.5 | |
| tolerance | Product grade | A |
| standard | GB/T 3103.1 | |
| Hexagonal flower shape | GB/T 6188 | |
| surface treatment | Without treatment; | |
| Electroplating technical requirements shall comply with GB/T 5267.1; | ||
| Technical requirements for non-electrolytic zinc flake coating shall comply with GB/T 5267.2; | ||
| If other technical requirements or surface treatment are required, it should be agreed upon by the supplier and the buyer. | ||
| Acceptance and packaging | GB/T 90.1、GB/T 90.2 | |
