Precision Technology Supplies Ltd Locking Washers Spring, Toothed, Curved and Wave locking washers. Metric Locking Washers   Nominal  Bolt Size MM Din 6798 & 6798 Shakeproof washers Internal & external tooth Outside Diameter  D2 Din 6797 & 6798 Shakeproof washers Internal & external tooth Thickness T Din 7980 Square section Spring washers Outside diameter D2 Din 7980 Square section Spring Washers Thickness T Din 127 Rectangular section Spring washers Outside Diameter D2 Din 127 rectangular section Spring washers Thickness  T 2 4.5 0.3 * * 4.4 0.5 2.5 5.5 0.4 * * 5.1 0.6 3 6.0 0.4 5.6 1.0 6.2 0.8 4 8.0 0.5 7.0 1.2 7.6 0.9 5 10 0.6 8.8 1.6 9.2 1.2 6 11 0.7 9.9 1.6 11.8 1.6 8 15 0.8 12.7 2.0 14.8 2.0 10 18 0.9 16 2.5 18.1 2.2 12 20.5 1.0 18 2.5 21.1 2.5 16 26 1.2 24.4 3.5 27.4 3.5 20 33 1.4 26.4 4.5 33.6 4.0 All dimension are in MM Imperial & Unified dimensions available on request If the information you require is not in the above tables please  us and we will be happy to send it to you. This information is for guidance only no liability can result from its use