Engineered for dependable fastening, our Square Nuts Steel Plain 3/8-16 deliver strong clamping power with a classic square profile. The plain steel construction means a simple, uncoated finish suitable for general-purpose assemblies and projects where corrosion resistance is not a primary requirement.

Key specifications

• Material: Solid steel
• Finish: Plain (unplated)
• Thread size: 3/8-16 UNC
• Fastener type: Square nut
• Drive/shape: Square corners for increased wrenching surface and torque transfer

Designed to pair with 3/8-16 bolts, these square nuts offer a larger bearing surface than hex nuts, helping to distribute load and resist loosening in vibration-prone assemblies. The uncoated steel means quicker, cost-effective machining and the option to finish or paint as needed during final assembly.

Ideal applications include woodworking, machinery, automotive repairs, and metal fabrication where a reliable, non-finished nut is preferred. Keep a supply on hand for quick repairs or stock a drawer full for ongoing projects.

Why choose square over hex? Square nuts provide superior torque transfer in tight, cramped spaces and align bolts with greater stability, making them a staple in both DIY and professional workshops.