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Changshu Huibo Railway Fastener Co.,Ltd. |
Description
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",
Grade: 4.8, 5.6, 6.8, 8, 8.8, 10.9,
Finish: Blacked, Black phosphorization chrome-faced. Zinc plated, (white, yellow) hot dipped galvanized, plain and other