Skidmore Wilhelm Model S Bolt Tester

The Skidmore Wilhelm Model S bolt tester is designed for small bolts (#6 to 1/4" and 3MM to 6MM)

The main considerations when choosing the proper calibrator are first, the size of the bolt in diametre and length that you will be testing, and second, the type of bolt head (standard, heavy, hex or tension control) You will need to purchase a plate for each diametre of bolt you will be testing and a bushing for each diametre and each type.