Cross recessed pan head spring and flat washers combination screws are commonly made of iron of stainless steel. The iron ones commonly include low, medium and high carbon steel. The materials grades are 1010, 1018 and 10B21 medium carbon steel. According to the hardness grade, it is divided into grades 4.8 and 8.8. Materials of grade 8.8 are generally produced with 1018 and 10B21. Combination screws made of carbon steel need to be hardened after production. After hardening, hydrogen need to be removed and then electroplated. The materials of stainless steel combination screws include stainless steel 201, stainless steel 304 and stainless steel 316. The combination screws are widely used in mechanical equipment, electronic products, furniture and other fields.
The Specification Form of GB9074.8 is as bellow
| GB9074.8 | M | ||||||
| d | 2.5 | 3 | 4 | 5 | 6 | ||
| P | Pitch | 0.45 | 0.5 | 0.7 | 0.8 | 1 | |
| a | max | 0.8 | 1 | 1.4 | 1.6 | 2 | |
| b | min | 25 | 25 | 38 | 38 | 38 | |
| k | max | 1.8 | 2.15 | 2.75 | 3.45 | 4.1 | |
| min | 1.66 | 2.01 | 2.61 | 3.27 | 3.8 | ||
| D1 | Nominal Size | 6 | 7 | 9 | 10 | 12 | |
| D2 | Ref. | 4.34 | 5.23 | 6.78 | 8.75 | 10.71 | |
| h | Nominal Size | 0.5 | 0.5 | 0.8 | 1 | 1.6 | |
| H | Nominal Size | 1.5 | 2 | 2.75 | 3.25 | 4 | |
| Socket No. | 1 | 2 | 2 | 2 | 3 | ||
Product standard of this physical picture: GB9074.8
Spec:M3-0.5*8 Strength Class：A2-70 Material:SUS Surface treatment :demagnetization
We are a professional Fastener manufacturer with a history of more than 20 years. Due to the large variety of screws, if you have other categories of standard parts and non-standard parts inquiries, please email us directly or contact us online. Looking forward to your contact
Reviews
There are no reviews yet.