Top washer has the following features: • The Working Load Limit and recommended torque value are permanently stamped into each washer. • Washer is color-coded for easy identification: Silver - Metric thread. • Individually Proof Tested to 2-1/2 times Working Load Limit. • Bolt specification is a Grade 12.9 alloy socket head cap screw to DIN 912. All threads listed are metric (ASME B18.3.1m). • Designed to be used with ferrous workpiece only. • BOLT SIZE IDENTIFICATION: The size of the bolt will be stated as in the drawing above. Illustration shows meaning of each dimension given