Cross cylindrical head machine screw
GB822
Diameter range: M2.5-M8 Length range: 3mm-100mm
| standard | GB national standard |
|---|---|
| Groove | Cross recess |
| head shape | cylinder |
| Thread | Fully threaded |
| (mm) | M2.5 | M3 | M3.5 | M4 | M5 | M6 | M8 |
|---|---|---|---|---|---|---|---|
| P | 0.45 | 0.5 | 0.6 | 0.7 | 0.8 | 1 | 1.25 |
| dk(max) | 4.5 | 5.5 | 6 | 7 | 8.5 | 10 | 13 |
| dk(min) | 4.32 | 5.32 | 5.82 | 6.78 | 8.28 | 9.78 | 12.73 |
| da(max) | 3.1 | 3.6 | 4.1 | 4.7 | 5.7 | 6.8 | 9.2 |
| k(max) | 1.8 | 2 | 2.4 | 2.6 | 3.3 | 3.9 | 5 |
| k(min) | 1.66 | 1.86 | 2.26 | 2.46 | 3.12 | 3.6 | 4.7 |
| r(min) | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | 0.25 | 0.4 |
| No. | 1 | 2 | 2 | 2 | 2 | 3 | 3 |
| t(min) | 1.2 | 0.86 | 1.15 | 1.45 | 2.14 | 2.25 | 3.73 |
| t(max) | 1.62 | 1.43 | 1.73 | 2.03 | 2.73 | 2.86 | 4.36 |
| steel | Stainless steel | nonferrous metals | ||
| General technical conditions | GB/T 16938 | |||
| Thread | tolerance | 6g | ||
| standard | GB/T 193、GB/T 9145 | |||
| Mechanical properties | Performance level | d＜3mm: according to the agreement; | 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 | |||
| Cross recess | GB/T 944.1 | |||
| 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 | |||
