T C Bolt, 1.Carbon Steel,SS,Alloy etc 2.M16-M30,Zinc,Black,etc 3.high quality,low price and best service Tensile Control bolts1.Main Size: 1/2''; 5/8'';3/4'';7/8'';1'';1 1/8'' or according to the request of customers;2.Material:Carbon steel or alloy steel;3.Standard: DIN,ANSI,ASME,ASTM,IFI,JIS,AS 4.The Mechanical Grade:8.8/10.9/12.9;5.Surface finishes:Zinc-plated(Black or Plain),Hot dip ...