DIN 6917 Square taper washers for U-sections for high-tensile structural bolting M 16 C45 tZn 17 3 000 pcs. M 20 C45 tZn 21 2 000 pcs. M 22 C45 tZn 23 500 pcs. M 24 C45 tZn 25 1 000 pcs.