Screw Checker, Inch, PEC

- #1 to 5/16" thread sizes
- Quickly identify unified and American threads
- NC, NF, and NS threads
- Made in USA
Screw checkers provide a quick way to measure standard threads. They provide all the information you need for screws; diameter, length, threads per inch, hole size and even tap drill sizes.

These things are quicker and more accurate than using a pitch gage and caliper to measure threads. Simply try the threaded part in the holes until you find the proper one. No guessing or interpretation.
