기능 원리
1. Tightening: teeth penetrate the surface
2. Loosening: teeth shear off material
3. Surface condition after loosening
Serrated hex flange head cap screws fully threaded
BN 20170Serrated hex flange head cap screws fully threaded
BN 20170- 표준
- ~DIN 6921 (Standard withdrawn)
- Headform
- Hexagonal with flange
- Drive
- Hexagon
- Thread
- fully threaded
- Material
- Steel
- Property class
- 8.8
- Surface
- zinc plated blue