(1) Threads and fasteners
1.Formation, structure and elements of thread
2. the type of thread
3. the specified drawing method of thread
4. Marking of thread
5.threaded fasteners
Surface roughness refers to the microscopic unevenness on the surface of al nart
Evaluate the parameters of surface roughness
Contour arithmetic mean deviation — Ra
Maximum height of profile — Rz
The contour arithmetic mean deviation Ra is preferred
Post time: Sep-27-2023