... :ASTM, JIS, BS, AS, ISO, GB, Nonstandard bolt Machine Part Self Tapping Screw model numberM3.5-6Brand NamePhoriaOriginal of PlaceSuzhou ChinaMaterial1018,Carbon Steel ... material weuse is SUS304. 3.If the torsion of the screw is not qualified, it will be possible to be Wrench ... specialize in producing various kinds of special screws. Machine Part Self Tapping Screw