Screw checkers made by Product Engineering Corporation (PEC) made in the US are the industrial standard for precision and durability. Made from a high-quality chrome-plated carbon steel which offers superior wear resistance and long-lasting, crisp graduations. Fully hardened, tempered and etched with precision. Tired of guessing thread sizes or making multiple trips to the hardware store? The PEC Fractional Screw Checker is the essential bench top tool for every machinist. This precision-machined gauge allows you to instantly and accurately identify the size, pitch, and length of any standard American fractional screw. Whether you are sorting a "junk drawer" of fasteners or verifying hardware for a critical assembly, our screw checkers provide a foolproof way to ensure you have the right fit every time. Comprehensive Range: Accurately identify common fractional sizes from #4 through 1/2" in both National Coarse (UNC) and National Fine (UNF) threads. Precision-Tapped Holes: Every hole is tapped to industrial standards, ensuring that if it threads in, it's the right size—no more stripped threads or forced fits. Integrated Length Gauge: Features a built-in ruler to quickly verify the overall length of flat-head or round-head screws. Shop-Ready Design: Compact enough for a toolbox, yet pre-drilled for easy mounting to a workbench or wall.
