Our Hardened Steel Insert Washers are made in-house, and used in all our Torque Plate products. 1018/1020 steel precision turned and FPC Hard Nitride coated.

1/2″ or 12mm Insert Washers have a 13/32″ (10.3mm) ID, 15/32″ Press Fit diameter (+0.001/+0.003″), and 5/8″ Top Step diameter.  Press register is 0.200″ tall and top step is 0.125″ tall.