Complete Guide to Nuts: Hex, Nyloc, Wing, Lock & More

Hex nuts are the most common industrial nuts, featuring six sides for wrench tightening. Square nuts have four sides and flange nuts include an integrated washer surface for load distribution. Available materials include zinc-plated mild steel, stainless steel (SS304), brass, and nylon for insulation. These nuts are essential for pairing with bolts and screws in machinery, construction, automotive, and general assembly applications.

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Nyloc nuts use a nylon insert to prevent loosening under vibration, making them essential for automotive suspensions, machinery, and vibration-prone assemblies. Flange nyloc nuts combine a flange with the nylon insert for better load distribution and vibration resistance. Metal lock nuts provide all-metal prevailing torque for high-temperature use where nylon inserts would fail. These self-locking nuts eliminate the need for separate lock washers in many applications.

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Wing nuts allow tool-free tightening using hand wings, perfect for frequently adjusted or removed components. Dome (cap) nuts protect exposed threads and provide a finished appearance for visible fastening applications. Barrel (cross dowel) nuts are used in furniture assemblies for hidden fastening, working with bolts to create strong joints in particleboard, MDF, and solid wood.

Insert nuts (LF/RF/D-type) and tee nuts provide robust threaded points in wood, plastic, and soft materials. They are commonly used in furniture, panels, and injection-molded parts, allowing bolts and machine screws to be repeatedly installed and removed without damaging the base material. LF (left flange) and RF (right flange) refer to the orientation of the barbs or prongs that grip the material.

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Cage nuts, clinch nuts, rivet nuts (rivnuts), weld nuts, and keps nuts serve specialized mounting needs in server racks, sheet metal, and welded assemblies. Cage nuts snap into square holes in rack rails for easy server mounting. Clinch nuts and rivet nuts create permanent threads in thin sheet metal. Weld nuts are spot-welded to panels. Keps nuts have an integrated lock washer for vibration resistance.

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Long (coupling) nuts join threaded rods or extend bolts; profile nuts fit into extruded T-slot profiles for adjustable machine framing. Both are used in structural and modular assemblies, offering flexibility in construction and easy reconfiguration.

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