Top 12 Square Nuts

A square nut is a four-sided nut used in conjunction with flat washers and square-headed bolts. Once tightened, they don't come loose quickly and are less likely to lose their shape after repeated tightening. They are easy to gauge and work with, in blind and tight locations.

Browse Best Square Nuts

Hard-to-Find Fastener 014973314552 Coarse Square Nuts, 1/2-13, Piece-10

  • Brand Name: Hard-to-Find Fastener
  • Model Name: 14973314552
  • Size Options: 1/2-13-Inch, 1/4-20-Inch, 1-8-Inch, 3/4-10-Inch, 3/8-16-Inch and 8 other options.
  • Material Options: Steel
  • Item Weight: 5.6 ounces
  • Satisfaction Score: 91%
  • Dimensions: 2.5 x 1.62 x 1.44 inches
  • Overall Score: 8.7
Store Website: www.amazon.com

Honbay 100pcs 304 Stainless Steel M3 Square Nuts

  • Brand Name: HONBAY
  • Model Name: M3-SQUARE-NUTS-100PCS
  • Material Options: Stainless_steel_304
  • Item Weight: 2.08 ounces
  • Satisfaction Score: 100%
  • Dimensions: 5 x 5 x 0.1 inches
  • Overall Score: 9.5
Store Website: www.amazon.com

A2 Stainless Steel Square Nuts Thin Type DIN 562 M3-5 Pack

  • Brand Name: Bolt Base
  • Size Options: 510203050100
  • Material Options: Stainless Steel
  • Satisfaction Score: 100%
  • Overall Score: 8.7
Store Website: www.amazon.com

Antrader 30pcs Zinc Plated M3 Square Nuts

  • Brand Name: Antrader
  • Model Name: QXAD0069
  • Size Options: M3x5.5mm(L)x2mm(T), 30 Pcs, M5x8mm(L)x3mm(T), 30 Pcs, M6x10mm(L)x3mm(T), 30 Pcs
  • Color Options: Bronze Tone
  • Material Options: Metal, Zinc Plated
  • Item Weight: 0.81 ounces
  • Satisfaction Score: 100%
  • Dimensions: 4.8 x 3.2 x 0.05 inches
  • Overall Score: 8.5
Store Website: www.amazon.com

uxcell Square Nuts, M4x7mmx2mm Yellow Zinc Plated Metric Coarse Thread Assortment ...

  • Brand Name: Uxcell
  • Model Name: A19030600ux0284
  • Size Options: M4x7mm(L)x2mm(H), 100 Pcs
  • Color Options: Yellow
  • Material Options: Carbon Steel
  • Item Weight: 0.81 ounces
  • Satisfaction Score: 100%
  • Dimensions: 6 x 4 x 0.2 inches
  • Overall Score: 9.9
Store Website: www.amazon.com

uxcell 50PCS M3 5.4 x 5.4 x 2mm Stainless Steel Square Machine Screw Nuts Fastener

  • Brand Name: Uxcell
  • Model Name: US-SA-AJD-198943
  • Size Options: M3x5.4mm(L)x2mm(H)
  • Color Options: Silver Tone
  • Material Options: Stainless Steel, Metal
  • Item Weight: 0.669 ounces
  • Satisfaction Score: 73%
  • Dimensions: 5.28 x 3.74 x 0.55 inches
  • Overall Score: 7.5
Store Website: www.amazon.com

uxcell M5 Square Nuts, 304 Stainless Steel Metric Coarse Thread Assortment ...

  • Brand Name: Uxcell
  • Model Name: A19030600ux0272
  • Size Options: M5 - 25 Pcs
  • Material Options: 304 Stainless Steel
  • Item Weight: 1.13 ounces
  • Satisfaction Score: 100%
  • Dimensions: 5.75 x 3.86 x 0.55 inches
  • Overall Score: 9.9
Store Website: www.amazon.com

Prime-Line 9192638 Square Nuts, 5/16 in.-18, Zinc Plated Steel, 25-Pack

  • Brand Name: PRIME-LINE
  • Model Name: 9192638
  • Size Options: Value Not Found
  • Material Options: Steel
  • Item Weight: 6.3 ounces
  • Satisfaction Score: 100%
  • Dimensions: 5 x 5 x 5 inches
  • Overall Score: 9.9
Store Website: www.amazon.com

100pcs M3 Metric Square Nuts 18-8 (304) Stainless Steel Fastener

  • Brand Name: Zw99 Store
  • Size Options: M5, M6, M8, M3, M4
  • Color Options: Silver
  • Material Options: Stainless Steel
  • Item Weight: 1.76 ounces
  • Satisfaction Score: 100%
  • Dimensions: 2.9 x 2.3 x 0.2 inches
  • Overall Score: 9.5
Store Website: www.amazon.com

100 Square Nuts 1/4"-20 Thread Bright Zinc

  • Brand Name: Clipsandfasteners Inc
  • Model Name: 2948070
  • Satisfaction Score: 100%
  • Dimensions: 0.44 inches
  • Overall Score: 9.9
Store Website: www.amazon.com

uxcell Square Nuts, M3x8mmx2mm Yellow Zinc Plated Metric Coarse Thread Assortment ...

  • Brand Name: Uxcell
  • Model Name: A19030600ux0281
  • Size Options: M3x8mm(L)x2mm(H), M4x7mm(L)x2mm(H), M5x8mm(L)x3mm(H), M6x10mm(L)x3mm(H), M6x12mm(L)x4mm(H)
  • Color Options: Yellow, Silver Tone
  • Material Options: Carbon Steel
  • Item Weight: 1.58 ounces
  • Satisfaction Score: 101%
  • Dimensions: 5 x 4.2 x 0.1 inches
  • Overall Score: 8.7
Store Website: www.amazon.com

Powlankou 200 Pieces 304 Stainless Steel M3 Square Nuts

  • Brand Name: Powlankou
  • Material Options: Zinc plated, Stainless_steel_304, Stainless Steel, Stainless_steel_18-8, Steel
  • Item Weight: 3.27 ounces
  • Satisfaction Score: 100%
  • Dimensions: 3.54 x 3.43 x 0.43 inches
  • Overall Score: 9.1
Store Website: www.amazon.com

Square Nuts Buying Guide

The first nuts and pegs were square, made of wood instead of metal. They were easy to tighten, as workers only needed to fashion a tool to grasp the nut's opposing sides. Their steel counterparts became commonplace around the turn of the 20th century; while hex nuts have replaced most of them, the square nut is still used. This guide offers tips on selecting square nuts for a project.

Keeping things together

Square nuts are used in all kinds of applications. Stainless steel 304 stands up to most stresses reasonably well, corrosion, fire, and heat-resistant. Nuts also come in zinc-plated carbon steel, which provides only moderate corrosion resistance, but is much sturdier and more durable. It comes down to what the worker's requirements are between versatility and strength.

Tailored to the project

Nuts compatible with manual installation are different from square nuts installed by machine. The former typically have beveled edges and corners on top, with a flat bottom. Machine screw square nuts, in contrast, tend to be smaller and thinner, with entirely flat tops and bottoms. The worker also has to select nuts of an appropriate thread, whether coarse or fine, as it has to be compatible with the bolts to be used with them.

Customized orders

Square nuts come in a range of sizes commensurate with the corresponding bolts. Their large surface area tends to make them difficult to tighten, and standard hex machine drivers and hex wrenches won't work with them here, so it's prudent to ensure one has a compatible wrench or a pair of fine-nosed pliers. Luckily, wrench slippage is less likely with square nuts, and their nature means workers can adjust them without a clear line of sight, which makes them the perfect choice for tight spots.