Castle Nuts (SAE Sizes)

Castle Nuts (SAE Sizes)

Castle Nuts – SAE Sizes

  • Zinc plated for corrosion resistance
  • Designed for use with cotter pins for secure locking
  • Various sizes with matching thicknesses
Size Width Across Flats Thickness Fine (SAE) No.
1/4-28 7/16 9/32 34-7504
5/16-24 1/2 21/64 34-7505
3/8-24 9/16 13/32 34-7506
7/16-20 11/16 29/64 34-7507
1/2-20 3/4 9/16 34-7508
9/16-18 7/8 39/64 34-7509
5/8-18 15/16 23/32 34-7510
3/4-16 1-1/8 13/16 34-7512
7/8-14 1-5/16 29/32 34-7514
1 – 14 1-1/2 1″ 34-7516
Shipping & Stocking Made Simple

At GNS Industrial Supply, we don’t just deliver products—we deliver peace of mind. Unlike traditional suppliers who ship and leave the rest to you, we take a hands-on approach to your inventory management. Our team visits your location, audits your existing stock, identifies what you need, and handles the reordering process for you. We then deliver directly to your facility and restock your supply room according to your preferred system—ensuring your operation runs smoothly without overstock or downtime. It’s a smarter, more personalized way to manage industrial supplies—built for teams who don’t have time to run out of what matters.