1.Quality standard :Grade8.8 10.9 12.9 2.Material:35# 40# 45# carbon steel 3.Surface:black oxide/zinc plated , phosphated

1.Quality standard :Grade8.8 10.9 12.9 2.Material:35# 40# 45# carbon steel 3.Surface:black oxide/zinc plated , phosphated

 use in : car, truck , trailer and semi-trailer

HRC33-44 heat treatment

stable braking capacity

1.Quality standard :Grade8.8 10.9 12.9 2.Material:35# 40# 45# carbon steel 3.Surface:black oxide/zinc plated , phosphated

tyre bolt