Stainless steel locknut is our flagship product, mainly from the anti-loosening effect. There are: M4X0.7, M5X0.8, M6X1.0 other standard parts and non-standard parts. Nylon ring are: blue gum and white glue. Nepalese cap DIN985 Hex Size on the edge thickness (min) Total thickness M3X0.5 5.32-5.5 2.4 3.7-4 M4X0.7 6.78-7 2.9 4.7-5 M5X0.8 7.78-8 3.2 4.7-5 M6X1.0 9.78-10 4 5.7-6 M7X1.0 10.73-11 4.7 7.14-7.5 M8X1.25 12.73-13 5.5 7.64-8 M10X1.5 16.73-17 6.5 9.64-10 M12X1.75 18.67-19 8 11.57-12 M14X2.0 21.67-22 9.5 13.3-14 M16X2.0 23.67-24 10.5 15.3-16