A traditional cut-thread woodscrew, such as ours, is machined from solid wire. The thread is cut into the body, leaving a full-sized plain shank beneath the head, with the threaded section tapering to a point. Typically, approximately one-third of the screw is plain shank and two-thirds is threaded. The screw diameter is measured at the largest part of the shank beneath the head.
This full-sized shank provides a substantial section beneath the head and can fit closely into a correctly sized clearance hole, helping limit gaps around the fixing. Correct drilling and installation remain important, particularly in marine, decking, cladding and other outdoor applications.
Our cut-thread woodscrews are produced on traditional screw machinery operated by skilled craftspeople.
How do these differ from commonly available rolled-thread woodscrews?
Rolled threads are formed by pressing wire between shaped dies, displacing the metal to create the thread rather than cutting it away. Depending on the design, this can leave the plain shank noticeably smaller than the outside thread diameter, creating a distinct step on partially threaded screws.
The coated steel decking screw shown below has this reduced-shank profile. Our traditional cut-thread screws retain a fuller shank beneath the head, offering a different construction and appearance. The comparison highlights why screws sold as the same nominal size are not necessarily equivalent in their dimensions or intended use.
Comparing our silicon bronze (left) and solid brass (right) cut-thread woodscrews with a coated steel rolled-thread decking screw of the same nominal size.
