A traditional cut thread woodscrew such as ours are machined down from a solid length of wire, meaning the thread is cut out of the body of the wire, which results in the plain shank under the head being the thickest part and tapering to a point. With approximately 1/3 plain shank under the head, and 2/3 thread, the diameter of the screw is measured at the largest point of the shank under the head.
This results in a stronger shank under the head, with the additional advantage of providing a seal against the timber to reduce water ingress, which is important for marine, decking or cladding or outdoor applications to reduce timber rot around the fastener.
Our cut thread woodscrews are produced on traditional screw machinery, operated by skilled craftsman.
How do these differ from commonly available rolled thread woodscrew?
A rolled thread woodscrew is where a thinner thickness of wire is compressed in a thread roller squeezing the shank material to form the threads. This leaves a noticeably thinner shank to outside thread diameter on the screw, seen as a distinctive step on part thread screws. The reduced shank under head makes these fasteners susceptible to torsion failure and water ingress. Suitable for low cost high tensile steel alloy fasteners, where inherent durability and traditional aesthetic of the copper-based fasteners isn’t required.
Comparing our silicon bronze (L) and solid brass (R) cut thread woodscrews with the same size coated steel rolled thread decking screw
