316 Stainless Steel Square Nut
316SS Stainless Square Nuts
A4 - 316 Stainless Imperial Nuts
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316 Stainless Steel Square Nuts

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Prized not only for their aesthetic, square nuts have a larger amount of surface area in contact with whatever part is being fastened, and are far less likely to become rounded off after loosening and tightening repeatedly.

While square nuts are hard to find in any grade of stainless steel, we carry them in passivated 316SS, one of the most corrosion resistant grades which is suitable for marine use in saltwater environments. The underlying 316 Stainless alloy and the passivation process will help to keep them corrosion free.

Size Height Width Across the Flats
6 0.11" (2.8mm) 0.31" (7.9mm)
8 0.13" (3.3mm) 0.34" (8.6mm)
10 0.13" (3.3mm) 0.37" (9.4mm)
1/4"-20 0.19" (4.8mm) 0.43" (10.9mm)
5/16"-18 0.21" (5.3mm) 0.56" (14.2mm)
3/8"-16 0.25" (6.3mm) 0.62" (15.7mm)
1/2"-13  0.44" (11.2mm) 0.79" (20.1mm)

Customer Reviews

Based on 4 reviews
Anthony Dyonzak
Restore grandma’s bench

Finding the perfect fit for my project, thanks

David Gough
Stainless steel 1/4-20 square nuts

I received the nuts promptly and they were packed very well. The quality was outstanding, they appeared to have been electro polished which made them very shiny. This is ideal for a marine environment because it increases corrosion resistance. While my application didn’t need this it just showed high attention to quality. I would buy from them again if the need arises.

Paul Barchet

316 Stainless Steel Square Nuts

James Brandt
Bolts, Nuts & Washers

I have a boat lift where the bolts kept rusting on me. I found stainless works with aluminum and in the water. After searching for stainless, I found this site. I had to place 2 separate orders due to not seeing what other bolts etc I needed. The greatest part of this was fast delivery, relatively local business, AND a hand written Thank you on the invoice! How many businesses give you that to make you feel important?

Thanks again for your "business" to be out there for us!
Jim Brandt
Leicester, MA