Slotted countersunk head machine screw (national standard)
GB69
Diameter range: M1.6-M10 Length range: 4mm-100mm
| standard | GB national standard |
|---|---|
| head shape | half sunken head |
| Groove | Slotted, slotted |
| Thread | Fully threaded |
| Surface | whitewash |
| (mm) | M1.6 | M2 | M2.5 | M3 | M3.5 | M4 | M5 | M6 | M8 | M10 |
|---|---|---|---|---|---|---|---|---|---|---|
| P | 0.35 | 0.4 | 0.45 | 0.5 | 0.6 | 0.7 | 0.8 | 1 | 1.25 | 1.5 |
| dk(max) | 3 | 3.8 | 4.7 | 5.5 | 7.3 | 8.4 | 9.3 | 11.3 | 15.8 | 18.3 |
| dk(min) | 2.7 | 3.5 | 4.4 | 5.2 | 6.94 | 8.04 | 8.94 | 10.87 | 15.37 | 17.78 |
| f | 0.4 | 0.5 | 0.6 | 0.7 | 0.8 | 1 | 1.2 | 1.4 | 2 | 2.3 |
| k(max) | 1 | 1.2 | 1.5 | 1.65 | 2.35 | 2.7 | 2.7 | 3.3 | 4.65 | 5 |
| n(max) | 0.6 | 0.7 | 0.8 | 1 | 1.2 | 1.51 | 1.51 | 1.91 | 2.31 | 2.81 |
| n(min) | 0.46 | 0.56 | 0.66 | 0.86 | 1.06 | 1.26 | 1.26 | 1.66 | 2.06 | 2.56 |
| t(max) | 0.8 | 1 | 1.2 | 1.45 | 1.7 | 1.9 | 2.4 | 2.8 | 3.7 | 4.4 |
| t(min) | 0.64 | 0.8 | 1 | 1.2 | 1.4 | 1.6 | 2 | 2.4 | 3.2 | 3.8 |
| steel | Stainless steel | nonferrous metals | ||
| General technical conditions | GB/T 16938 | |||
| Thread | tolerance | 6g | ||
| standard | GB/T 193、GB/T 9145 | |||
| Mechanical properties | Grade | d＜3mm: according to the agreement; | A2-50、A2-70 | d＜3mm: according to the agreement; |
| d≥3mm: Grade 4.8, Grade 5.8 | d≥3mm：CU2、CU3、AL4 | |||
| standard | d＜3mm: according to the agreement; | GB/T 3098.6 | d＜3mm: according to the agreement; | |
| d≥3mm：GB/T 3098.1 | d≥3mm：GB/T 3098.10 | |||
| tolerance | Product grade | A | ||
| standard | GB/T 3103.1 | |||
| surface defects | GB/T 5779.1 | - | ||
| surface treatment | Without treatment; | Simple handling; | Simple handling; | |
| Electroplating technical requirements shall comply with GB/T 5267.1; | Passivation treatment technical requirements according to GB/T 5267.4 | Electroplating technical requirements according to GB/T 5267.1 | ||
| 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. | ||||
| Acceptance and packaging | GB/T 90.1、GB/T 90.2 | |||
