china factory balck hex bolt 1)Sizes:1/4''-1'' 2)Standard:DIN933/ DIN931 3. ... Material:Q235/ss china factory black hex bolt 1.Size and type: Bolt: M6-M64Nut: M6-M64Threaded Rod:4-2000mmheavy hex ... ,310S, 316, 316L, 321, 317L, 2507, 2205, 254SMO, AL6XN, 1.4501,1.4529.Super duplex stainless steel F55, F51,F53 HastelloyB&C ... , Saudi Arabia, South Korea,etc.We also have the other bolt and nut