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This section provides an overview for square nuts as well as their applications and principles. Also, please take a look at the list of 10 square nut manufacturers and their company rankings. Here are the top-ranked square nut companies as of March, 2025: 1.Aspen Fasteners Inc., 2.Big Bolt, 3.American Fastener Technologies Corporation.
Table of Contents
A Square Nut is a square shaped fixture used in combination with a screw or bolt.
A square nut is also called a plate nut if it is square in shape but thinner in thickness. T-slot nuts and two-hole nut plates are also square nuts.
Hexagonal nuts, which have a hexagonal shape and are widely used, require a tool to hold both the nut side and the bolt side when tightening or loosening a screw, thus requiring both hands to be occupied.
Square Nuts, on the other hand, are fitted into a groove or otherwise aligned with a corner or surface, eliminating the need to secure the nut, so that only the bolt side needs to be tightened.
Using the appropriate nut for the installation site facilitates tightening work.
The main applications of square nuts are for building components, electronic components, and automotive parts. Materials to be secured by square nuts include pressed products, molded resin products, and wood.
These materials are easy to form the grooves and wall shapes necessary for using square nuts, and are easy products to use square nuts.
Square Nuts are arranged so that at least one of the ridges of the square outline follows the wall shape of the part to be fastened, thereby preventing the nut from rotating with the bolt during fastening operations. to stop the nut from rotating.
In other words, when using square nuts, the surface of the part to be fastened by the square nut must have a wall shape that is in contact with the square nut.
Square nut screw sizes are from M3 to M24 and shapes in terms of height, length of one side of a regular square, and diagonal length. As for mechanical properties, the strength classifications are 4T, 5T , and 6T.
Not all square nuts are specified, and those used for wood are excluded. Square Nuts that are particularly thin are called plate nuts.
For example, in the case of an M4 size female screw, the plate nut is 1.8 mm thick, while the square nut is 3.2 mm thick, nearly twice as much. Whilst the plate nut is thinner than the square nut because it is intended for use in areas of a plate where a female screw is desired.
In addition to the plate nut, square nuts come in a variety of shapes. Typical examples include the diamond nut type and rectangular nut. These nuts are used to create space for assembly in metal products such as pressed products or plastic molded products, and are fastened using small screws or bolts. In addition, there are special nuts for pipe, knurled, irregularly shaped, special square, small size, eccentric hole, multiple holes, etc.
The main materials used for square nuts are steel and stainless steel.
As with general nuts, surface treatments are applied, such as trivalent chromate, unichromate plating, chromate plating, nickel plating, chrome plating, and iron tetroxide coating. There are also fabrics that do not undergo surface treatment.
Square Nuts are mainly manufactured by a method called cold heading or cold forging.
Cutting is the best method for small quantities.
*Including some distributors, etc.
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Big Bolt is a Bloomingdale, Illinois-based manufacturer and supplier of structural fasteners founded in 1977. The company produces a large selection of studs, bolts, screws, washers, and rods for use in various industrial applications in agriculture, construction, aerospace, and transportation. The company also produces specialty units including metric fasteners sized and measured to metric system standardizations, and ACME fasteners with trapezoidal threadings for use in motion control and power transmission. Custom engineering and secondary services provided by Big Bolt include milling, threading, heat treating, and plating.
American Fastener Technologies Corporation (AFTC) is a manufacturer of precision-made industrial fasteners based in Gibsonia, Pennsylvania. Established in 1983, the company’s product portfolio includes masonry anchors, self-drilling screws, structural fasteners, and threaded rods. These primarily supply the military and defense, transportation, energy, and construction industries. The company stocks various materials and alloys tested to meet SAE, ASTM, and ISO standards. These are used in conjunction with AFTC services offered to clients including fabrication, testing, coating, and packaging of custom fasteners.
KD Fasteners, Inc. was founded in 1987 and headquartered in Addison, Illinois. The company is a fastener manufacturer and distributor, specializing in custom fasteners from such materials as steel, brass, silicon bronze, and other non-ferrous metals, supplying over 100,000 different fastener components. The company has 3 product segments: standard fasteners, standard metric fasteners, and custom fasteners. Custom fastener varieties include studs, washers, machine screws, flange bolts, and many other varieties. The company also offers many plating varieties including zinc, black oxide, waxing, and Magni 565 and 560.
National Bolt & Nut Corporation is based in Schaumburg, Illinois. National Bolt & Nut is a distributor of bolts, nuts, and related tools, serving the heavy equipment & construction, mining, transportation, automotive, and alternative energy industries. National Bolt & Nut is ISO 9001 certified. National Bolt & Nut product listings include standard and custom nuts, spacers, and washers with assorted head styles. Other offerings include a variety of screws, pins, and sprockets.
MF Supply is a stocking distributor for business, industry, and government. MF Supply specializes in fasteners, hardware, and safety supplies. MF Supply product categories include PPE & safety, brands and equivalents, custom made parts, dowel pins, electronic & panel hardware, inserts, metric, Mil-spec & domestic, nuts & washers, pins, precision shoulder screws, rivets & rivetnut inserts, screw driving tools, screws, self-clinching fasteners, socket products, spacers & standoffs, studs, and other products such as sealants, retaining rings, and screw driving tools.
Coburn-Myers Fastening Systems Incorporated was founded in Trainer, Pennsylvania in 1981. Coburn-Myers manufactures and distributes industrial fasteners and related products. Coburn-Myers focuses both on standard bolts as well as custom designs featuring hundreds of combinations of materials, head styles, heat treatment, secondary operations, and finishes. Types available include hex bolts, heat cap screws, 12-point bolds, and stocked cap screws. Primary product also include buts, fasteners, studs, hand tools, anchors, washers, and other standard products.
Doran Specialties is based in Yorba Linda, California and is a distributor of a variety of fastening hardware and tools. Doran Specialties is 9001:2015 certified. Product categories include AN, MS, NAS, and BAC-certified fasteners including bolts, nuts, fittings, washers, rivets, screws, inserts, and pins. Doran Specialties’s other products include retaining rings, bushings, rods, cables, lanyards, captive screws and nuts, clams, connectors, semiconductors, fuses, keys, machine screws, set screws, spacers and standoffs, springs, wire forms, stampings, switches, washers, and wire. Additional aircraft-specific hardware include hook and loop fasteners, nylon fasteners, O-rings, and plugs.
Benchmark Fasteners, Inc. is based out of Carol Stream, Illinois. The company is a manufacturer and distributor of various varieties of fasteners and fastener-related items including drill bits, driver bits, and cable ties. The company’s product lines include standard and stainless-steel fasteners and socket screws in imperial and metric measurements. Custom options are also available for screw machine parts, stampings, CNC precision machine parts, and cold-headed parts. Additional services the company provides include poly-bagging for large or varied orders, technical assistance before and after ordering, secondary options customization of threading and plating and same-day shipping for in-stock products.
MiniTec GmbH & Co. KG, launched in 1986 and based in Schönenberg-Kübelberg, Germany, is a manufacturer of profile and linear systems. The company crafts aluminum profiles, special profiles, linear modules, sliding guides, and height-adjustable tables. It also makes mini conveyor belts, protection systems, steel shafts, and industry products. Whenever particularly lightweight profiles are required, its aluminum profiles in grid size 30 are used, e.g. for the construction of protective enclosures and covers, or for bracing.
Aspen Fasteners was founded in 1961 and headquartered in Las Vegas, Nevada. Aspen Fasteners is a distributor for industrial fasters. Aspen Fasteners offers an extensive line in both metric and inch standards of anchors, bolts, nuts, screws, washers, rings, pins, pipe plugs, rivets, inserts, rods, studs, spacers, standoffs, panel fasteners, and tools including adapters, drivers anchor setting tools, keys, measuring tools, screwdriver insert bits, and screwdriver power bits. Material types include aluminum, brass, copper, iron, lead alloy, monel nickel copper alloy, nylon, phosphor bronze, plastic, silicon bronze, stainless steel, steel, and zinc.
Ranking as of March 2025
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | Aspen Fasteners Inc. |
14.8%
|
| 2 | Big Bolt |
11.5%
|
| 3 | American Fastener Technologies Corporation |
9.8%
|
| 4 | KD Fasteners, Inc. |
9.8%
|
| 5 | Coburn-Myers Fastening Systems, Inc. |
9.8%
|
| 6 | MF Supply |
9.8%
|
| 7 | National Bolt & Nut Corp. |
9.8%
|
| 8 | MiniTec GmbH & Co. KG |
8.2%
|
| 9 | Benchmark Fasteners |
8.2%
|
| 10 | Doran Specialties |
8.2%
|
Derivation Method
The ranking is calculated based on the click share within the square nut page as of March 2025. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
United States of America
|
8 | 88.9% |
|
Germany
|
1 | 11.1% |
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