M1 Cast Iron calibrated test weights are high quality cast iron weights that are cast in sand moulds and knocked out once set. They are then shot blasted for a smooth finish and blasting grounded on the parts the blasting does not remove. The weights are then black etched painted by dipping or spraying for a smooth black matt protected finished. Test weights up to 2kg are hexagonal in shape and 5kg -25kg are bar weights with a handle.
All check weights are calibrated to M1 standards and available with certificate of calibration traceable to National Standards
Click here for full specification of M1 tolerances