Stainless Steel Hex Nuts
What are stainless steel hex nuts? Stainless steel hex nuts are six-sided internally threaded nuts driven with a wrench, the most common nut for general fastening with bolts and screws. Made from 304 and 316 stainless, plus A2 and A4 metric, they resist rust in wet, coastal, and outdoor conditions where plated nuts corrode.
Stainless Steel Hex Nuts
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Machine Screw Nuts
Small hex nuts in 18-8 and 316 stainless sized for machine screws under 1/4 inch, for electronics, panels, and light assemblies.
Hex Finish Nuts
Standard hex nuts in 304, 316, and A4 stainless for everyday fastening with hex cap screws, socket screws, and bolts.
Heavy Hex Nuts
Wider, thicker hex nuts in 304 and 316 stainless that add bearing area and strength for larger, higher-load joints.
Hex Jam Nuts
Thin hex nuts in 18-8, 304, 316, and A4 stainless used to lock another nut in place or set position in tight clearances.
Choosing the right hex nut for the job
Hex nuts vary by thickness and duty. Standard finish nuts cover most fastening, heavy hex nuts add bearing area and strength for larger, higher-load joints, jam nuts are thin and used to lock another nut or set position, and machine screw nuts are small nuts for screws under a quarter inch. Match the nut style and grade to the bolt, with 304 or A2 for general use and 316 or A4 for coastal and saltwater exposure, so the whole joint stays corrosion resistant.
Hex nut types
- Machine screw nuts: small hex nuts for machine screws under 1/4 inch.
- Hex finish nuts: standard nuts for everyday bolt and screw fastening.
- Heavy hex nuts: wider and thicker for higher-load joints.
- Hex jam nuts: thin nuts to lock a primary nut or set position.
Common applications for stainless hex nuts
- General assembly with stainless bolts and screws
- Structural and higher-load joints (heavy hex)
- Locking a nut or setting position (jam nuts)
- Marine, dock, and outdoor hardware (316 or A4)
Pair these with matching stainless bolts and washers, and browse every hex nut style and finish on the main hex nuts category.
Stainless Steel Hex Nuts FAQ
What grades do hex nuts come in?
304 and 316 stainless, plus metric A2 and A4. A2 is comparable to 304 and A4 to 316.
What is a jam nut used for?
A jam nut is a thin nut tightened against a second nut to lock it in place, or used alone where a low-profile nut is needed to set position.
Why do stainless hex nuts gall?
Stainless threads can cold-weld under friction and torque. Use anti-seize and drive slowly to prevent galling, especially on larger sizes.