Sealey Nut and Bolt Thread Checker Gauge

The Sealey Nut and Bolt Thread Checker Gauge is a precision measuring tool designed to accurately identify thread types and sizes on nuts, bolts, and screws. This essential workshop gauge eliminates guesswork when matching fasteners, ensuring you select the correct replacement component every time. Featuring 28 individual thread checkers, this comprehensive gauge covers 14 Imperial sizes (6-32C to 1/2-20F in UNF/UNC) and 14 Metric sizes (M4 to M14) in both coarse and fine pitches. The easy-to-read markings clearly distinguish between male and female thread versions, making