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This section provides an overview for hexagon slotted nuts as well as their applications and principles. Also, please take a look at the list of 7 hexagon slotted nut manufacturers and their company rankings. Here are the top-ranked hexagon slotted nut companies as of April, 2025: 1.Aetna Screw Products Co., 2.United Titanium, Inc, 3.Trifast plc.
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1985-2014: Worked for Alstom Corporation, ABB Corporation, and Gadelius Corporation, designing Jungstrom air preheaters and mechanical design of diamond soot blowers. (ABB Corporation: https://new.abb.com/jp)
2014-2021: Worked as an engineering and project manager at Alvos Inc.
https://www.linkedin.com/in/yoichi-hiroki-92192394/
Hexagon-slotted and castle nuts are nuts with grooves cut into one end on all six sides. These grooves allow for the insertion of a split pin into a drilled hole in both the thread and the nut groove to prevent loosening.
They are sometimes referred to as "castle nuts" because their shape, including the grooves, resembles that of an old Western-style castle. Castle nut features a small surface area around the six grooved sides, facilitating a tight and compact wrap of the split pin around the nut.
Figure 1: Application of Hexagon Slotted Nuts
Hexagon-slotted nuts are used to prevent loosening and nut dropout by inserting a split pin or similar device into the nut groove and threaded hole. Although various nuts are now widely available, hexagon-slotted nuts were frequently used for their reliable prevention of loosening.
However, because their installation requires drilling on the thread side, they are costly and can damage the thread. Nowadays, their use is limited to situations such as high-temperature environments or when the nut mustn't fall off, even if loosened.
Hexagon-slotted nuts can be reused during disassembly and reassembly, but the split pin should not be reused; it must be replaced with a new one.
Figure 2: Principle of Screw Tightening and Loosening
The principle of screw tightening and loosening involves applying a compressive force to the fastened object and a tensile force to the bolt shaft, which is repelled by the object. This tensile force generates a frictional force between the bolt/nut's seating surface and the fastened object, securing the screw in place.
In this state, three frictional forces work together:
Screw loosening occurs when these frictional forces are reduced due to various factors, such as distortion or indentation of the seating surface, vibration-reducing axial force, or lubrication reducing friction between threads.
Figure 3: Installation of Hexagon Slotted Nut and Split Pin
The hexagon-slotted nut compensates for the reduction in initial axial force but does not prevent slippage of the seating surface or loosening due to the nut's return rotation. Installation involves inserting a split pin into the bolt groove and threaded hole, bending the split pin tips into the groove along the nut side and the threaded side and end, ensuring the nut stays in place without loosening.
Figure 4: Types of Hexagon Slotted Nuts
The types of hexagon-slotted nuts are generally specified in various standards. Figure 4 illustrates each type and shape.
1. Type 1 High/Low
The hexagonal part has an infeed groove, and the nut height is high, suitable for small nominal diameters. This type is chosen when there are restrictions on nut height.
The high type features a groove from the hexagonal portion to the upper part, intended for large nominal diameters..
Type 3 has a Class 1 seat, and Type 4 has a Class 2 seat, differentiating them by their seating surface specifications.
Hexagon-slotted nut materials are specified according to various standards. Some types and nominal diameters are to be determined by agreement between the delivery parties.
*Including some distributors, etc.
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Aetna Screw Products Co., founded in 1963, and based in Chicago, IL, is a manufacturer and supplier of spherical bearing products and industrial fasteners. The company specializes in spherical rod ends, ball joints, wheel bolts, tailored fasteners, and linkage products. Expanding to Mexico, China, and Europe, it's now a key partner for major distributors and OEMs. It provides various U.S.A.-made wheel and hub assembly fasteners for automotive, heavy truck, and agricultural equipment industries. The company offers logistics management services and streamlines supply chains with JIT & DFT solutions, ensuring products reach the assembly line in "AIAG" bar-coded bins.
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.
United Titanium, Inc., established in 1962 and headquartered in Wooster, Ohio, is a manufacturer and supplier of metals and fasteners specializing in titanium and its alloys. The company specializes in providing various fasteners, fittings, and components for industries including aerospace, medical, and chemical processing. Its product range includes bolts, nuts, washers, and custom-machined parts. These materials find applications in environments that require corrosion resistance and high strength-to-weight ratios. The company is ISO 9001:2015 certified, ensuring quality management systems.
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.
Fastenright Limited, established in 1983 in the United Kingdom, is a supplier of security fasteners, special fasteners and general fixings. The company's product portfolio includes screws, nuts, bolts, and washers, catering to the specific needs of different sectors, including the automotive, rail, oil and gas industries. Fastenright also supply custom-manufactured security fixings, including non-standard lengths and diameters, both metric and imperial threads, as well as products made to customer drawings and specifications.
TR Fastenings Ltd. is part of Trifast plc, established in 1973, is a global distributor of industrial fasteners and components, based in the United Kingdom. The company caters to automotive, electronics, and general manufacturing sectors. They supply components to over 5,000 companies globally across a wide range of industries, blending their global manufacturing capability, with strong distribution and logistic support, creates a winning combination. Their Group consists of 34 locations within the UK, Asia, Europe and the USA including 7 high volume sites manufacturing cold forged fasteners and special parts and 3 technical and innovation centres.
Ranking as of April 2025
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | Aetna Screw Products Co. |
23.5%
|
| 2 | United Titanium, Inc |
17.6%
|
| 3 | Trifast plc |
17.6%
|
| 4 | National Bolt & Nut Corporation |
11.8%
|
| 5 | Fastenright Limited |
11.8%
|
| 6 | National Bolt & Nut Corp. |
11.8%
|
| 7 | KD Fasteners, Inc. |
5.9%
|
Derivation Method
The ranking is calculated based on the click share within the hexagon slotted nut page as of April 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
|
4 | 66.7% |
|
United Kingdom
|
2 | 33.3% |
160 products found - Page 2
160 products - Page 2
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