Truss head hex socket machine screw , Locking wooden parts or low strength metal sheet , can be work with nuts ,

Material : Steel
Finish : Chrome back oxide
Size : M4X30
Threads : 6H
Grade : 4.8
Fitting operation tool : Hex wrench


Installation attention

1. Check threads is good or not  before installation , make sure no broken threads , stuffed threads etc.
2. Make sure put force direction is strict with threads direction , right or left .
3. Put light force at beginning and slow speed to make screw is screwed up properly ,
4. If need nuts to work for fixing  part , make sure threads specification is strictly comply with screw's