carriage boltsA carriage bolt (likewise called mentor screw and round-head square-neck bolt is a type of fastener used to secure metal to metal or metal to wood.

It is recognized from different bolts by its shallow mushroom head Bolts and the way that the cross-part of the knife, however round for the vast majority of its length (as in different sorts of bolt), is square quickly underneath the head. This makes the bolt self-locking when it is put through a square opening in a metal tie. This permits the latch to be introduced with just a single instrument, a spanner or wrench, working from one side. The top of a carriage bolt as a rule is a shallow vault. The knife has no strings; and its width rises to the side of the square cross-segment.

The carriage bolts was conceived for use through an iron reinforcing plate on one or the other side of a wooden shaft, the squared piece of the bolt squeezing into a square opening in the ironwork. It is normal to utilize a carriage bolt to uncovered wood, the square segment giving sufficient hold to forestall turn.

The carriage bolts is utilized widely in security trimmings, like locks and pivots, where the bolt should be removable from one side in particular. The smooth, domed head and square nut underneath forestall the carriage bolt from being opened from the shaky side.

Specification : CARRIAGE BOLT IS:2609 & AS PER CUSTOMER DRAWING M12, M16, M20, M22, M24, 4.6, 5.6, 5.8, 6.8, 8.8

Thread Length

30mm to 150mm




Black, Zinc, HDG

Packaging Size

50 Kg Bag

Nominal Size

5/16″ to 1/2″




4.6, 5.6, A307