A carriage bolt, also known as a coach bolt, has a domed or countersunk head, and the

shank is topped by a short square section under the head. The square section grips into

the part being fixed (typically wood), preventing the bolt from turning when the nut is tightened.

A rib neck carriage bolt has several longitudinal ribs instead of the square section, to grip into

a metal part being fixed.   

We are the professional manufacturer of Screws and Rivets,located in zhejiang province.

The biggest advantage of our company is to specialize in producing various kinds of

special screws.So customized fastenters can be made as customer's sample or drawing.