Limit thread pitch gauge. US & Metric Univ. - Part # MCS521124
Limit thread pitch gauge. US & Metric For US & Metric threads. Clearly identify the threads on your bolt in case of doubt. Measures the windings per inch (USA) or per millimeter (Metric). US 4 to 42 windings per inch (30 blades). Metric 0.25 to 6.0 per millimeter (24 blades).