... distributor of Rc fasteners and Rc parts Hex Socket Button Head Screws (ISO7380=ASME B18.3)Material : Alloy = SCM435 (10. ... where protrusion is allowed. After locked in, its round-edge head will cause no scratch for other items.Sizes list: ProductHex ... , Painting, Anodizing, Heat treatment, AlodineTolerancehexagon socket screws: +0.0004/-0, +0/-0.0004 inchStandard DIN912,913,914,915,916,DIN84,ASME B18 ...