The Complete Guide to Hex Nuts – Types, Grades & Applications

Hex nuts may seem like small, insignificant components, but they play a critical role in construction, machinery, and DIY projects. Choosing the right type and grade of hex nut can make the difference between a secure, long-lasting connection and a potential failure. This guide covers everything you need to know—from basic functions to installation tips.

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What Are Hex Nuts?

Hex nuts are six-sided fasteners with internal threads, designed to secure bolts or screws in place. Their hexagonal shape allows for easy tightening using wrenches or sockets, making them essential for construction, automotive, and industrial applications.

Common Uses of Hex Nuts

Construction (beams, scaffolding, bridges)
Machinery & Automotive (engine parts, equipment assembly)
DIY & Furniture (securing joints, mounting hardware)

Heavy Hex Nut vs. Standard Hex Nut

Feature	Standard Hex Nut	Heavy Hex Nut
Size	Smaller, thinner	Larger, thicker
Strength	General use	High-stress applications
Applications	Furniture, light machinery	Bridges, heavy machinery

Types of Hex Nuts

Standard Hex Nuts – General-purpose fastening
Heavy Hex Nuts – Extra strength for structural use
Lock Nuts (Nyloc) – Anti-vibration, ideal for machinery
Jam Nuts – Secondary nut to prevent loosening
Flange Nuts – Built-in washer for surface protection

Hex Nut Grades (ASTM Standards)

Grade	Material	Best For
A563-A	Low carbon steel	Light-duty construction
Grade 2H	Quenched & tempered	Structural (bridges, buildings)
Grade DH	Medium carbon steel	Heavy construction
Stainless (304/316)	Corrosion-resistant	Marine, chemical industries

How to Remove a Stripped Hex Nut

✅ Pliers/Vise Grip – For slightly damaged nuts
✅ Dremel Cut Slot – Turn with a flat-head screwdriver
✅ Nut Splitter – Safely cracks the nut without bolt damage
✅ Heat & Penetrating Oil – Loosens rusted nuts

Buying Guide: Choosing the Right Hex Nut

✔ Size & Thread Pitch – Match with your bolt
✔ Material – Stainless steel (corrosion resistance) or zinc-plated (general use)
✔ Grade – Select based on load requirements
✔ Bulk Purchase – Cost-effective for large projects

Hex nuts are essential for strong, reliable fastening in countless industries. By selecting the right type, grade, and material, you ensure durability and safety in your projects. Need high-quality hex nuts? Explore our range today!