Hs32
Head type: Round, square, hex, T
Neck of the bolt: Cylindrical, oval or square

Thread: UNC, UNF, ISO, BSW
Diameter: M16---M30, 7/16"---1-1/2",
The length does not limit.
Grade: 10.9, 8.8, 8, 4.8, 6.8, 5.6, 4
Finish: Blacked, Black phosphorization, chrome-faced. Zinc plated, (white, yellow) hot dipped galvanized, plain and so on.