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Stainless Steel Square Nuts
What are stainless steel square nuts? Stainless steel square nuts are four-sided nuts with more surface area than a hex, used with carriage bolts and in wood, strut, and restoration work to resist spinning. Made from 304 and 316 stainless, they resist rust in wet and outdoor use while giving a wide bearing surface.
Why choose a square nut over a hex nut
A square nut has more flat bearing surface and more contact with the material, which helps it resist spinning and pull-through in wood and strut. Square nuts also pair naturally with carriage bolts and give a period-correct look on restoration and historic work. In 304 and 316 stainless, they add corrosion resistance for outdoor and marine use, with 316 for coastal exposure.
Why choose stainless steel square nuts
- Wide bearing surface: resists pull-through and spinning in wood.
- Carriage bolt match: a natural pairing for square-neck bolts.
- Corrosion resistance: 304 and 316 hold up in wet and outdoor use.
- Traditional look: suited to restoration and visible hardware.
Common applications for stainless square nuts
- Carriage bolt connections in wood
- Strut and channel framing
- Restoration and historic hardware
- Outdoor and marine fastening (use 316)
Pair these with stainless carriage bolts, and browse every size and finish on the main square nuts category.
Stainless Steel Square Nuts FAQ
What grades do square nuts come in?
304 and 316 stainless. Use 316 for coastal and saltwater exposure.
Why use a square nut instead of a hex nut?
Square nuts have more bearing surface and grip, which helps resist spinning and pull-through in wood and strut, and they suit a traditional appearance.
Do square nuts fit carriage bolts?
Yes. Square nuts pair well with carriage bolts and are a common match for wood connections and restoration work.