Castle nuts are a great general purpose fastener when used in conjunction with another item to create a “lock”. Commonly paired items include: Cotter pins – split pins that lock the bolt and nut assembly in place. Drilled Shank Fasteners – bolts that have a hole drilled through the middle for a pin. M20 thread diameter, 2.5mm pitch, DIN 935 bolts.A hex nut with opposed slots cut into the top of the nut through the centers of the flats. The slots are on the end opposite the bearing surface.The slots are for the insertion of a cotter pin to secure the nut when used with a drilled shank fastener.Commonly used in the automotive industry to secure front wheel bearings / wheel hubs to spindles on cars and trucks.A small smear of copper slip grease should be used with stainless steel bolts to aid removal
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