... years experience in special fastener field 1,Name: Machined steel screw cap;Machined screw cap;Steel screw cap 2,For the similar screw cap,what can we do ?(1), Ability for the ... material of this kind of screw cap: Grade3.6,4.6,4.8,5.6,6.8 ... risks.P.S:For us,the most competitive industry is machined hardware fastener ,especially the cutting/turning parts. Machined steel screw cap