Standard: AREMA, UIC, or manufacture according to drawings and samples from customers.
Specification:16…24×40…500...\1/2\5/8\11/16\3/4″×1-1/2…12″.
Grade: ASTM A307 ASTM A325 ,4.6, 4.8, 5.6 ,5.8 ,8.8
Protection: Black, Zinc Plated, Hot dip galvanized.
This products are high strength railway screw ,installed with rail screw dowel.