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The 8 Best square nuts of 2025

Are you trying to find square nuts among various brands on the market but aren’t sure where to begin? To assist you in finding the right one, we’ve put together a list of the 7 best to help you pick the perfect one!

We investigated and evaluated a number of the top-selling square nuts on the market in order to create our list of the best. Making a decision among the many options available is never simple. There are an infinite number of models available, each with a distinct price. And as you’ll find out, the best options aren’t usually the ones you imagine! This comparison is rich and relevant because of the numerous factors that were employed. You will find products featured in this ranking not only based on their pricing but also on their features and other customers reviews. To write this review, we completed 16 hours of research and did 46 square nuts tests. You won’t need to pick products at random any more. If you’re unsure of what to look for, browse our list and consult the buying guide!

An overview of our top picks

Table of contents

The best square nuts you can buy today

No. 1
150Pcs 304 Stainless Steel 6 Sizes Metric Square Nuts Assortment Kit, Machine Screw Nuts Metric Coarse Thread - M3 M4 M5 M6 M8 M10
  • √ Product Name: Metric 304 Stainless Steel Square Nuts Assorment Kit. The item come with a sturdy plastic organizer box for convenient to store and carry.
  • √ Size: M3 M4 M5 M6 M8 M10
  • √ Material: 304 Stainless Steel, corrosion resistant galvanized finish to ensure life-time use, these quality assortment washers for home, automotive, and shop use.
  • √ Quantity: It contains 150Pcs / 6 Sizes of the most commonly used 304 Stainless Steel Square Nuts. Different types of square nuts,designed to stand off the material to allow easy weld penetration,widely used to industrial machine.
  • √ Widely Application: Great replacement for industrial and construction fasteners,also can be a important accessories in your daily life.
No. 2
The Hillman Group 160300 1 1 1 1/4-20 Square Nut, 100-Pack
  • Square nuts are nuts with a square shape that are typically mated with square-headed bolts
  • Square nuts are used along with flat washers in order to avoid damage from their sharp edges and help to increase the strength of the fastener
  • Zinc-plated for moderate corrosion resistance
  • Brand: The Hillman Group
No. 3
Powlankou 200 Pieces 304 Stainless Steel M3 Square Nuts
  • 【Dimension】Thread Inner Diameter: M3 (3mm / 0.12inch); Height: 2.5mm / 0.1inch; Pitch: 0.5mm/0.02inch; Square Width: 5.5mm / 0.22inch, Coarse Thread; Color: Silver Tone; Quantity: 200 Pieces.
  • 【Material】Made of 304 Stainless Steel, which is superior to regular steel and any zinc plated fasteners, provides good strength and corrosion resistance in bad environments, which can ensure long time using.
  • 【M3 Stainless Square Nut】widely used in a variety of industries such as construction, manufacturing, engineering, assembling, aircraft and so on and serves a wide range of use for professionals, amateurs, landlords, repairmen.
  • 【Wide Applications】It can be widely used in all kinds of precision machinery, classified instruments, instruments, electronic products, household appliances, communication products, locks, lamps, lights, toys, etc. Ideal for use by a variety of workers and repairmen from plumbers to assemblymen both professional and amateur.
  • 【Package Included】200 Pieces M3 Stainless Steel 18-8 (304) Square Nuts. Please don't hesitate to contact us if you have any questions or concerns. Nuts are internally threaded fasteners that are used with bolts and threaded rods and studs to connect components.
No. 4
304 Stainless Steel Machine Square Screw Nuts 304 Square Nuts Metric Assortment Kit Nut 139Pcs
  • High Quality:Square nuts are made of 304 stainless steel.Even in bad environment like high temperature, cold weather, and high humidity areas. They have superior corrosion,rust resistance and the excellence of oxidation resistance, which can ensure long time using.
  • Quantity: It contains 139Pcs / 6 Sizes of the most commonly used 304 Stainless Steel Square Nuts.
  • Feature:Stainless Steel Square Nuts designed to stand off the material to allow easy weld penetration.
  • Convenient Box:All the quadrant screw nuts are packed in a transparent plastic box with compartments,which is convenient to carry,store or reuse as a backup kit.
  • Wide Applications:The nuts are widely used in machinery,petrochemical,telecommunications,chemical industry,construction,electricity,textile, sports equipment,paper,sewage treatment,marine,automotive and other industries.
SaleNo. 5
Hard-to-Find Fastener 014973314552 Coarse Square Nuts, 1/2-13, Piece-10
  • Diameter: 1/2"
  • Material: Steel
  • Finish: Zinc
  • Thread Type: 13 (Coarse)
  • Type: Square Nut
No. 6
Swpeet 220Pcs 304 Stainless Steel 6 Sizes Metric Square Nuts Assortment Kit, Machine Screw Nuts Metric Coarse Thread - M3 M4 M5 M6 M8 M10
37 Consomer Reviews
Swpeet 220Pcs 304 Stainless Steel 6 Sizes Metric Square Nuts Assortment Kit, Machine Screw Nuts Metric Coarse Thread - M3 M4 M5 M6 M8 M10
  • √ Product Name: 220Pcs Metric 304 Stainless Steel Square Nuts Assorment Kit. The item come with a sturdy plastic organizer box for convenient to store and carry.
  • √ Size: M3 M4 M5 M6 M8 M10
  • √ Material: 304 Stainless Steel, corrosion resistant galvanized finish to ensure life-time use, these quality assortment washers for home, automotive, and shop use.
  • √ Quantity: It contains 220Pcs / 6 Sizes of the most commonly used 304 Stainless Steel Square Nuts. Different types of square nuts,designed to stand off the material to allow easy weld penetration,widely used to industrial machine.
  • √ Widely Application: Great replacement for industrial and construction fasteners,also can be a important accessories in your daily life.
No. 7
uxcell Square Nuts, M8x25mmx5mm Zinc-Plated Metric Coarse Thread Assortment Kit, 10 Pcs
  • [THREADED SIZE] - M8 x 1.25mm.
  • [DIMENSION] - 0.98"(25mm) wide, 0.2"(5mm) high.
  • [MATERIAL] - Constructed from Carbon steel, white zinc plated finished, anti-rust and anti-corrosion, superior electrical conductivity.
  • [How to use] - Usually use screws to clamp the connected terminal wire; use a wrench to fix the square nut, and use a drive tool to lock the screw in the tightening position.
  • [Application]- It suitable for indoor and outdoor, widely used in civil furniture, equipment, construction, electrical appliances, industrial machinery, etc., generally used with fasteners, screws, washers, screws, etc., mainly for connection, assembly, fixing, and other functions.
No. 8
115Pcs Metric Stainless Steel Square Nuts Assortment Kit, INCONTESTA Machine Square Screw Nuts for M3 M4 M5 M6 M8 M10 M12 Screws Bolt
  • Different types of square nuts,designed to stand off the material to allow easy weld penetration,widely used to industrial machine.
  • High Quality Metric Stainless Steel Square Nuts Assortment Kit,6 Sizes of the most commonly used Square Nuts Can meet your different needs.
  • Size: M3 M4 M5 M6 M8 M10 M12
  • Material: Stainless Steel, corrosion resistant galvanized finish to ensure life-time use, these quality assortment washers for home, automotive, and shop use.
  • Widely Application: Great replacement for industrial and construction fasteners,also can be a important accessories in your daily life.
SaleNo. 9
The Hillman Group 3337 5/16-18 Square Nut Zinc Plated, 30-Pack
  • Square nuts are nuts with a square shape that are typically mated with square-headed bolts
  • Also used as a blind nut in furniture manufacture
  • Zinc-plated for moderate corrosion resistance
  • Quantity per pack: 30
No. 10
uxcell Square Nuts, M4x7mmx2mm Zinc-Plated Metric Coarse Thread Assortment Kit, 200 Pcs
  • [THREADED SIZE] - M4 x 0.7mm.
  • [DIMENSION] - 0.27"(7mm) wide, 0.08"(2mm) high.
  • [MATERIAL] - Constructed from Carbon steel, white zinc plated finished, anti-rust and anti-corrosion, superior electrical conductivity.
  • [How to use] - Usually use screws to clamp the connected terminal wire; use a wrench to fix the square nut, and use a drive tool to lock the screw in the tightening position.
  • [Application]- It suitable for indoor and outdoor, widely used in civil furniture, equipment, construction, electrical appliances, industrial machinery, etc., generally used with fasteners, screws, washers, screws, etc., mainly for connection, assembly, fixing, and other functions.
No. 11
Hillman 3338 3/8-16 Square Nut Zinc Plated, 25-Pack
  • Square nuts are nuts with a square shape that are typically mated with square-headed bolts
  • Also used as a blind nut in furniture manufacture
  • Zinc-plated for moderate corrosion resistance
  • Quantity per pack: 25
No. 12
Niooliuk Pack of 100 M6 Square Nuts, 304 Stainless Steel Metric Coarse Thread Assortment Kit
  • [THREADED SIZE] - M6 x 1.0mm.
  • [DIMENSION] - 0.4"(10mm) wide, 0.2"(5mm) high.
  • [MATERIAL] - Constructed from 304 Stainless Steel, plating finish, anti-rust and anti-corrosion,superior electrical conductivity.
  • How to use] - Usually use screws to clamp the connected terminal wire; use a wrench to fix the square nut, and use a drive tool to lock the screw in the tightening position.
  • [Application]- It suitable for indoor and outdoor, widely used in civil furniture, equipment, construction, electrical appliances, industrial machinery, etc., generally used with fasteners, screws, washers, screws, etc., mainly for connection, assembly, fixing and other functions.
No. 13
Niooliuk Pack of 50 M8 Square Nuts, 304 Stainless Steel Metric Coarse Thread Assortment Kit
  • [THREADED SIZE] - M8 x 1.25mm.
  • [DIMENSION] - 0.51"(13mm) wide, 0.24"(6mm) high.
  • [MATERIAL] - Constructed from 304 Stainless Steel, plating finish, anti-rust and anti-corrosion,superior electrical conductivity.
  • How to use] - Usually use screws to clamp the connected terminal wire; use a wrench to fix the square nut, and use a drive tool to lock the screw in the tightening position.
  • Application]- It suitable for indoor and outdoor, widely used in civil furniture, equipment, construction, electrical appliances, industrial machinery, etc., generally used with fasteners, screws, washers, screws, etc., mainly for connection, assembly, fixing and other functions.
No. 14
Niooliuk Pack of 10 M10 Square Nuts, 304 Stainless Steel Metric Coarse Thread Assortment Kit
  • [THREADED SIZE] - M10 x 1.5mm
  • [DIMENSION] - 0.67"(17mm) wide, 0.31"(8mm) high.
  • [MATERIAL] - Constructed from 304 Stainless Steel, plating finish, anti-rust and anti-corrosion,superior electrical conductivity.
  • [How to use] - Usually use screws to clamp the connected terminal wire; use a wrench to fix the square nut, and use a drive tool to lock the screw in the tightening position.
  • [Application]- It suitable for indoor and outdoor, widely used in civil furniture, equipment, construction, electrical appliances, industrial machinery, etc., generally used with fasteners, screws, washers, screws, etc., mainly for connection, assembly, fixing and other functions.
No. 15
Niooliuk Pack of 100 M4 Square Nuts, 304 Stainless Steel Metric Coarse Thread Assortment Kit
  • [THREADED SIZE] - M4 x 0.7mm.
  • [DIMENSION] - 0.28"(7mm) wide, 0.12"(3mm) high.
  • [MATERIAL] - Constructed from 304 Stainless Steel, plating finish, anti-rust and anti-corrosion,superior electrical conductivity.
  • [How to use] - Usually use screws to clamp the connected terminal wire; use a wrench to fix the square nut, and use a drive tool to lock the screw in the tightening position.
  • [Application]- It suitable for indoor and outdoor, widely used in civil furniture, equipment, construction, electrical appliances, industrial machinery, etc., generally used with fasteners, screws, washers, screws, etc., mainly for connection, assembly, fixing and other functions.
No. 16
The Hillman Group 160298 1 1 1 10-32 Square Nut, 100-Pack
  • Square nuts are nuts with a square shape that are typically mated with square-headed bolts
  • Square Nuts Are Used Along With Flat Washers In Order To Avoid Damage From Their Sharp Edges And Help To Increase The Strength Of The Fastener
  • Zinc-Plated For Moderate Corrosion Resistance
  • From The Brand Name: The Hillman Group
No. 17
1/4'-20 Stainless Steel Square Nuts, 304 Stainless Steel 18-8, Bright Finish, Full Thread, Coarse Thread UNC, Pack of 50
10 Consomer Reviews
1/4"-20 Stainless Steel Square Nuts, 304 Stainless Steel 18-8, Bright Finish, Full Thread, Coarse Thread UNC, Pack of 50
  • Thread Size:1/4-20; Thread Pitch: 20 TPI; Thread Type: Coarse Thread UNC
  • Package: 50 PCS
  • Nut Width (from point to point): 0.6 inch; Nut Width (across the flat): 0.42 inch; Nut Height: 0.22 inch
  • Made of 304 stainless steel 18-8 ( no coating outside) which is superior to regular steel and any zinc plated fasteners, provides good strength and corrosion resistance in bad environments.
  • Ideal used for indoor and outdoor projects, like furniture, electrical appliance, industrial machinery, equipment. Mainly for connection, assembly, fixing and other functions.
No. 18
200Pcs Metric 304 Stainless Steel Square Nuts Assortment Kit, INCONTESTA Machine Square Screw Nuts for M3 M4 M5 M6 M8 M10 Screws Bolt
  • Different types of square nuts,designed to stand off the material to allow easy weld penetration,widely used to industrial machine.
  • High Quality Metric Stainless Steel Square Nuts Assortment Kit,6 Sizes of the most commonly used Square Nuts Can meet your different needs.
  • Size: M3 M4 M5 M6 M8 M10
  • Material: 304 Stainless Steel, corrosion resistant galvanized finish to ensure life-time use, these quality assortment washers for home, automotive, and shop use.
  • Widely Application: Great replacement for industrial and construction fasteners,also can be a important accessories in your daily life.
No. 19
The Hillman Group 3342 3/4-10 Square Nut Zinc Plated, 5-Pack
  • Square nuts are nuts with a square shape that are typically mated with square-headed bolts
  • Also used as a blind nut in furniture manufacture
  • Zinc-plated for moderate corrosion resistance
  • Quantity per pack: 5
No. 20
Hard-to-Find Fastener 014973401306 Coarse Square Nuts, 5/8-11-Inch, 12-Piece
  • Diameter: 5/8"
  • Material: Steel
  • Finish: Zinc
  • Thread Type: 11 (Coarse)
  • Type: Square Nut

How to choose a good square nuts

Does the idea of finding a fantastic square nuts make you anxious? When it comes to purchasing this product, specifically when deciding which model to select, has your head been spinning between options? You are not alone if that is the case. We are aware of the pressure involved in the purchasing process!

Your presence here indicates that you are interested in square nuts. Before choosing which product would be the best for your needs after being inundated with information, locate a reliable source with genuine selections. You can get that information from a variety of sources, including buying guides and rating websites, word-of-mouth recommendations from friends and family, online discussion forums where users can share their own experiences, product reviews that can be found all over the internet, and YouTube channels. You can only get the right product through exhaustive analysis. But you realize that’s not always simple. In order to ease your concerns, we have taken the time to develop a list of the top square nuts products available right now. You might be wondering how we came up with the list. How was this buying guide developed?

First, we used our algorithms to gather as much reliable data as we could about these products. To verify all the data gathered, we used both artificial intelligence and a lot of algorithms.
Then, our experts used criteria that are recognized in the business to evaluate them according to their quality to price ratio, allowing us to choose the top square nuts on the market right now!

The selection of the goods is not arbitrary. Before creating a list, we take into account a number of factors. Below are some of the criteria discussed:

Brand Value: What happens if you choose a dubious brand just because it appears to be a good deal? So the likelihood of receiving a product with a short shelf life increases. That is due to the fact that well-known brands have a reputation to uphold, while others do not. Top square nuts brands strive to provide some distinctive traits that set them apart from the competition. So, hopefully one or more of the items on our list will be perfect for you.

Features: Useful features are all you need, not tons of them. We consider the important aspects and select the top square nuts based on those.

Specifications: Numbers always help you measure the quality of a product in a quantitative way. We try to find products with higher specifications, but with the right balance.

Quality: A product’s quality may always be quantified with the aid of numbers. We look for goods with better standards that strike the proper balance. The best quality product that gets highly appreciated and recommended by experienced users.

Customer ratings:  Would it be accurate to suggest that the square nuts were used by hundreds of customers before you? Superior ratings indicate that many customers had better service.

Customer Reviews: Like ratings,  provide you with accurate and reliable information about the product from genuine customers. Customer ratings are very important to all of us because they contain accurate and reliable information about the customer service we received from several hundred customers.

Seller Rank: This is very intriguing! Not only do you need a good square nuts, you also need a product with rising sales that is trendy. It accomplishes two goals. First, the expanding user base proves the quality of the product. Second, given that number, producers must be able to offer greater quality and after-sales support.

Value: You get what you pay for, they say, so consider the value. Cheap isn’t always good and expensive isn’t always bad. However, that does not imply that spending a lot of money on a product that is flashy but underwhelming is a good idea. Before adding them to the list, we make an effort to evaluate how much value you can get for your money from your square nuts.

Durability: Durability and reliability are closely related concepts. You will benefit from a strong and long-lasting square nuts for months and years to come.

Product availability: Products come and go, and new ones replace the old ones. Most likely, a few new features and required changes were made. What use is it to use a supposedly good product if the maker no longer supports it? We make an effort to highlight products that are current and offered by one or more trustworthy sellers, if not more.

Negative Reviews: Yes, we do take that into account as well! The goods with the majority of bad reviews are filtered out and disregarded when we choose the best-rated one on the market.

These are the standards by which we selected our square nuts. Do we end our process there? Hell no. The most crucial fact about us that you should be aware of is that we regularly update our website with current and pertinent information. We have one more layer of filtration since we place the greatest importance on reader satisfaction. Please let us know if any product included here is incorrect, irrelevant, subpar, or simply out of date. We always value your opinions, and we’ll work hard to make any necessary corrections to our list in response to them.

Why should you believe us?

There are now thousands of possibilities for these products on Amazon, but choosing the best one can be difficult and time-consuming. And what square nuts should you purchase in 2022?

This guide is the result of more than 10 years of experience in researching, testing and writing about many topics. Each member of our team is an authority in their area. We read every article we could find online and every consumer review on every retail website for seven hours. Additionally, we discovered a ton of websites that offered helpful resources, including buying tips and thorough information on square nuts.