Faithfull 52-Leaf Screw Pitch Gauge | Metric & Whitworth

Identifying unknown fastners by eye can lead to costly errors, stripped threads, and project delays. The Faithfull 52-Leaf Screw Pitch Gauge provides a fast, foolproof method to determine the exact pitch of any internal or external thread. By offering both Metric and Whitworth profiles within a single pocket-sized tool, it serves as an invaluable asset across automotive repair, heavy industrial maintenance, and heritage restoration projects.

The design relies on a folding pocket-knife style arrangement. At each end of the protective steel housing, a series of precisely machined teeth profiles are stacked together. To check a thread, you simply fan out the blades and press the teeth against the grooves of your screw or bolt. When the correct blade is found, the teeth will mesh perfectly with the thread without leaving gaps or riding up over the crests.

This model is particularly helpful when working with older machinery or mixed fleets where British Standard Whitworth (BSW) and modern Metric fasteners exist alongside one another. The dual-ended layout separates the two standards cleanly, allowing you to switch between measurement systems seamlessly. Each blade is stamped with its precise size value, ensuring that once you find a match, you can immediately read the measurement without searching for a conversion chart.

Built to withstand the conditions of a busy workshop, the gauge includes adjustable locking wheels at both pivots. These thumbscrews allow you to tighten down the assembly to hold a single leaf steady during a check, or loosen the friction to quickly sort through the stack. When the job is finished, all 52 leaves fold entirely within the rugged outer frame, preventing the teeth from getting bent, nicked, or contaminated by grease and debris in your toolbox.