Micro hexagon socket head cap screw
<Alloy Steel>
Strength Grade: 8.8 , 10.9, 12.9
Surface treatment: blackening treatment (other surface treatments are available on demand)
<Stainless steel>
Strength Grade: A2-70 and the like
Surface treatment: Passivation Process
Manufacturer: ANSCO, NF, NSN, GOSHO, KKT, TKS, N, etc.
The hexagonal hole has a strict dimensional tolerance,and some manufacturers make t larger than the standard value to make it less slippery.
Please ask our customer service for  specifications not shown in the following table .