Stainless Castle Nuts - Fine (SAE) Thread

18-8 stainless steel castle (slotted) nuts, with slots that line up with a cross hole in the bolt so a cotter pin can lock the nut. We stock 1/4-28, 5/16-24, 3/8-24, 7/16-20, 1/2-20, 5/8-18, 3/4-16.

Specifications

Material: 18-8 stainless steel
Sizes: 1/4-28, 5/16-24, 3/8-24, 7/16-20, 1/2-20, 5/8-18, 3/4-16
Style: castle (slotted) nut
Thread: SAE fine (UNF)

Common Uses

Axles, spindles and steering linkages
Trailer and marine hardware
Pivot pins

FAQ

How do I install a castle nut?
Tighten the nut, then turn it to the next slot that lines up with the hole in the bolt. Push a cotter pin through and bend the legs.

How do I stop stainless threads from galling?
Stainless threads can seize (gall) when tightened fast or under heavy load. Put anti-seize on the threads, tighten slowly at low speed, keep the threads clean and don't overtighten.

Can I use stainless with zinc plated or galvanized parts?
Use stainless nuts and washers with stainless bolts and screws. In wet conditions, stainless touching zinc plated, galvanized or aluminum parts can cause galvanic corrosion of the zinc or aluminum.

Free shipping on orders over $100, and orders placed before noon EST ship the same day. Purchase orders are accepted from government agencies, schools, hospitals, municipalities and companies with established credit with The Nutty Company, Inc.