Type WNI - Stainless Steel, not hardened.
DIN1804 Slotted Lock Nut, Stainless Steel, Hardened or Not Hardened
On slotted lock nuts DIN 1804 the ground surface d3 stands proud and should be used as a mating surface.
Being made of stainless steel, these lock nuts are ideal for use in clean rooms, such as found in the food, medical and pharmaceutical industries, and their associated processing and packaging.
The sizes M45x1.5 to M60x1.5 have six slots.
Stainless Steel NI, AISI 303, not hardened, not ground.
Compatible C spanners DIN1810 are also available.