Nut

The Unsung Heroes of Every Assembly: Automotive & Equipment Nuts

A nut might be the smallest component in any repair job, but it is never the least important. Whether you are rebuilding a small engine, securing body panels, or assembling a high-performance fuel system, the right nut — properly sized, correctly threaded, and made from the right material — is the difference between a solid, lasting repair and a comeback job. This category spans more than 400 products covering the full range of nut types used across automotive, powersports, marine, and outdoor equipment applications.

Types of Nuts and What They Do

Modern vehicles and equipment rely on a surprisingly wide variety of nut styles, each engineered for a specific purpose:

• Hex Nuts — The standard six-sided fastener used across nearly every mechanical assembly. Available in SAE, metric, Grade 2, Grade 5, Grade 8, and Class 8 or Class 10.9 metric equivalents.
• Lock Nuts (Nylon Insert / Prevailing Torque) — Feature an integrated nylon collar or distorted thread section that resists loosening under vibration — essential for suspension components, engine mounts, and exhaust hardware.
• Flange Nuts — Include an integrated washer-like base that distributes clamping load and resists loosening, ideal for sheet-metal and structural connections.
• Acorn / Cap Nuts — Dome-shaped nuts that cover exposed stud threads, protecting against corrosion and providing a finished appearance.
• Speed / Clip Nuts (U-Nuts) — Spring-steel nuts that clip onto panel edges, allowing a bolt to thread in without requiring access to the back of the panel — a staple of body shop repairs and trim work.
• Push Nuts — Used on smooth round studs where a conventional threaded nut is impractical; common in interior trim and headlight assemblies.
• Jam Nuts — Thin, low-profile hex nuts used to lock another nut in place or to adjust threaded rods and linkages.

Material and Finish: Why It Matters

Steel nuts are the most common, but the coating is critical. Zinc-plated hardware resists everyday corrosion and is appropriate for interior and protected locations. For exhaust, marine, or under-body work, look for nuts with heavy zinc or geometric phosphate coatings, or consider stainless steel where budget allows. In motorsport and performance builds, anodized aluminum nuts save weight while providing a clean look and non-conductive properties. Always match the material and grade of your nut to the bolt or stud it pairs with — mixing grades can lead to stripped threads or fastener failure under load.

Top Brands in This Category

Auveco is the go-to source for specialty automotive nuts that are difficult to find elsewhere. For over 100 years, Auveco has been manufacturing and distributing specialty automotive and industrial fasteners, with a catalog spanning over 23,000 products and more than 1 million OEM applications. Their nut offerings include push nuts, nylon panel nuts, and a wide range of OEM-replacement hardware for specific make and model applications.

Dorman brings its well-known aftermarket problem-solving approach to the fastener aisle. Dorman's AutoGrade line includes thousands of fasteners — from basic nuts, bolts, pins, and screws to premium chrome wheel hardware. Their nuts are manufactured using durable materials and corrosion tested to ensure required strength and longevity, with hardware built to specific thread tolerance standards.

Briggs & Stratton is the world's largest producer of small air-cooled gasoline engines, and their factory-spec nuts are essential for anyone servicing or rebuilding Briggs-powered lawn mowers, generators, pressure washers, and other outdoor equipment. Using OEM Briggs & Stratton hardware ensures correct torque specs and thread compatibility throughout the engine assembly.

RADIUM Engineering caters to the performance and motorsports end of the spectrum. Since 2010, Radium Engineering's goal has been to design and produce high-quality aftermarket automotive performance products, with all parts carefully planned through thorough R&D and designed in-house using the latest computer simulation and modeling techniques, with extensive testing to ensure performance exceeds expectations. Their anodized aluminum acorn nuts are a popular choice for securing electrical studs and finishing high-performance engine bay builds.

Shopping Tips

Always verify thread pitch and diameter before ordering — a nut that looks right can easily have the wrong pitch for metric vs. SAE applications. Check the grade or class rating to ensure the nut meets the load requirements of the joint. When replacing OEM hardware, cross-referencing by the vehicle make, model, and original part number will yield the most accurate match and prevent costly re-orders.