Product Name: Rail clip bolt /T-Head Bolts Product Standard: AREA or ASTM, BS, SS and UIC or other standard or drawing required by clients. Specification: HS26, HS32, and Diameter from M20, M22, M24, M27, M30 or 3/8" to 1-1/8", length from 20mm to 600mm, or 1-1/2" to 26". Grade: 4.6, 4.8, 5.6, 8.8, 10.9, Gr2, Gr5, Gr 8. Protection: Black, White zinc, Yellow zinc, hot dipped galvanized.