A: Size:M4-M100,1/2“-4”
A: Material:Q235/C45/16Mn/65Mn/35CrMo/42CrMo, B7 etc
A: Surface:Plain, black oxide, galvanized, HDG, YZP, dacromet, etc
A: B7 studs are sheet metal fasteners that are very similar to a bolt. Unlike a bolt, however, the stud does not have a head. The B7 in the name of the stud is a grade of steel alloy. They host high tensile strength and are generally used in high pressure and high-temperature environments.
A: UNC Threaded Bars have a 60-degree thread flank angle, but like other Threaded Rods are essentially metal bars (made from mild steel or brass) that have a helical thread all the way along its length.