M20-2.5 ASTM A325m Heavy Hex Structural Bolts Des: Heavy hex Structural Bolts require a hex head that is larger than a standard (finished) hex head. These specifications includeA193, A320 and A307B. Although A325 and A490 bolts also require a heavy hex head. please refer to Structural Bolts for dimensional specifications, since these bolts have shorter thread lengths than standard heavy hex bolts. Heavy hex structural Bolts covers high strength heavy hex structural bolts from ½" diameter through 1-1/2" diameter It has three Types,Type1,Type2,Type3,with different technical and head mark. ASTM A325/A490 Recommended Nuts and washers for assembled is Heavy hex Nut and F436     These bolts are intended for use in structural connections Specifications: 1.Size: M12~M36 2.Standard:ASTM A325M, ANSI/ASME B 18.2.1, 3.Property Class: A325M 4.Material: Carbon steel or Alloy steel 5.Finish:Plain,Black,Zinc,YZP,Black Ph.HDG.Nickel P…

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