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This section provides an overview for self-locking nuts as well as their applications and principles. Also, please take a look at the list of 26 self-locking nut manufacturers and their company rankings. Here are the top-ranked self-locking nut companies as of December, 2024: 1.Dual Machine Corp./ Klincher Locknut Corp., 2.NBK America LLC, 3.Monroe JHP Fasteners, Inc..
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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/
A self-locking nut is a nut with a function or mechanism to prevent loosening.
It is also commonly referred to as a lock nut. Tightened nuts can loosen due to vibration, impact, thermal expansion, and other factors. Therefore, there are various methods to prevent loosening of screws.
For example, there are double nuts in which two nuts are stacked on top of each other, spring washers or toothed washers are inserted between the nut and the object to be tightened, and adhesives are applied to the threaded part. A self-locking nut, on the other hand, can prevent loosening with only one part, and its advantage is that it is easy to install.
Figure 1. Examples of the use of anti-loosening nut
Self-locking nuts are used in locations where loosening of bolts and nuts can cause damage or accidents. Examples include automobiles, aircraft, railroad cars, bridges, and buildings. Most of these products have the potential for damage or accidents due to loosening bolts and nuts that could cause them to fall off.
Other applications include swing chain suspension shafts at playgrounds in parks and frame fixation parts of training machines in gymnasiums.
Figure 2. Principle of tightening and loosening with screws
When a bolt or nut is tightened on a fastened object, the object is subjected to a compressive force (pinching force), while the bolt shaft is subjected to a tensile force that is repelled by the object. This tensile force generates a frictional force between the bolt/nut's seating surface (the surface in contact with the object to be fastened) and the object to be fastened, and the screw is fixed.
In this state, the following three frictional forces work and interact with each other.
When this frictional force is lost for some reason, it is called "screw loosening." An example is shown below.
Figure 3. Types of anti-loosening nuts
There are several types of self-locking nuts, depending on their shape and self-locking method. Since each has its own characteristics and suitable application, it is often the case that they are used differently depending on the cause of loosening.
Figure 4. Types and shapes of anti-loosening nuts (1)
Figure 5. Types and shapes of anti-loosening nuts (2)
Figure 6. Principle of the wedge
Self-locking nuts apply the wedge principle to prevent "screw loosening" as described above.
By eccentrically aligning the center axes of the two nut holes and tightening the nuts with a conical concave-convex fit between them, a large frictional force is generated on the conical surfaces of the nuts to prevent loosening of the screw. An example of a product is the "hard lock nut," which can be used repeatedly.
Figure 7. Principle of friction ring locknut
A metallic spring-effect ring is attached to the top surface of the nut and contacts the male thread of the bolt to increase frictional force, thereby creating a self-locking nuts effect. Generally, this is a "friction ring locknut," and product examples are called "U nuts."
Friction ring locknuts have excellent heat and earthquake resistance. An example of such a product is the 'nylon insert lock nut. Other examples include the "flange nut," which has a higher frictional force on the seating surface to prevent loosening, and the "grooved nut," which is secured by a pin that passes through the nut and bolt to prevent loosening.
*Including some distributors, etc.
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NBK America LLC, founded in 2015 and based in King of Prussia, Pennsylvania, is an American manufacturer and a subsidiary of Japan's Nabeya Bi-tech Kaisha, specializing in mechanical components. Their product range includes couplings, like miniature shaft couplings for precision machine tools and semiconductor manufacturing equipment, special screws, such as vacuum application screws and other machine components. NBK offers finite automaton (FA) solutions, including wireless positioning units for production lines and setup operations. NBK provides machine component servicing, such as vibration resistance treatment and laser engraving. Services for couplings and special screws include coupling stainless steel screw alteration and screw length adjustment.
Captive Fastener Corporation, founded in Oakland, NJ in, in 1974 is a manufacturer of elf-clinching fasteners. The company's product portfolio includes Self-Clinching Nuts, Self-Clinching Studs, Self-Clinching Standoffs, Self-Clinching Panel Fasteners and Self-Clinching Fasteners for Stainless Steel Sheets. The company serves industries such as Oil and Gas, Aerospace and Defense, Automotive and Transportation, Construction, and Power Generation. The company provides services such as Product Selection Guidance, Engineering Support, and Custom Manufacturing.
Dual Machine Corp., founded in 1945 and headquartered in Indianapolis, Indiana, is a manufacturer and supplier of klincher products. The company offers Klincher Locknuts and Klincher Kapscrews used in military applications, turbine engines, automotive turbochargers, and ship-building applications. The company was ISO 9001:2008 certified in 1998 while in 2018 it achieved the ISO 9001:2015 and AS9100:2016 Certifications allowing its products to be used in the aerospace industry. The company offers both standard as well as custom Klincher Locknuts with varying tolerances, dimensions, and/or threading to meet the customer’s specific application.
Monroe JHP Fasteners, Inc., founded in 1970, is a supplier of fastening products and services used in the metal fabrication industry. The company, which changed its name from John H. Powers to Monroe JHP Fasteners, Inc in 2000, is based in Walker, Michigan, and supplies customers across the United States, Canada, and Mexico. They supply fasteners, including self-clinching, welding, and miscellaneous. Other products supplied by Monroe JHP Fasteners include rivets, sockets, flat and button head cap screws. The company has partnered with Captive Fastener, Sherex Rivet Nuts, and Industrial Rivet and Fastener Company, which manufacture the products they supply.
Established in 2001, and located in Handan City, China, Hebei Chengyi Engineering Materials Co., Ltd is a manufacturer specializing in the production and sales of fasteners that are used in the electric power, steel structure, construction, and, mining industries. The company produces nuts&bolts, studs, screws, anchors, and, threads that have applications in the automobile industry. They also provide a series of washers including a spring washer, conic washer, tooth washer, and DIN 125 flat washer that are needed in the photovoltaic industry.
Caliber Enterprises is a manufacturer specialized in nuts established in 2005 in Mumbai, India. The firm offers a wide range of items in their product catalogue. It produces various kinds of bolts, nuts, peek fasteners, rivet guns, parallel connectors, and more. In addition, it manufactures and supplies fasteners materials like stainless, alloy, duplex and carbon steel. The firm holds various PED and ISO 9001:2018 certificates. Its bolts fasteners also meet International Quality Standards (IQS).
Chin Hsing Precision Industry Co., Ltd, established in 1990 and located in Minxiong, Taiwan, is a manufacturer of bearing adapter sleeves, hydraulic adapter sleeves, and the like. The company crafts adapter sleeves and hydraulic adapter sleeves, withdrawal and hydraulic withdrawal sleeves, and lock nuts and prevailing torque bearing nuts with metal inserts. It also produces lock washers, brass self-lubricating bushings and ceramic ball bearings, and linear guides and ball screws. Its adapter sleeves have good self-locking properties and are also used in heavy-duty transmission or shock vibration applications.
TorqBolt Inc., founded in 2013 with headquarters in India, is a manufacturer of exotic alloy fasteners. The company's product line includes nuts, screws, washers, and stud bolts, as well as the supply of surface treatments for various applications for original equipment manufacturers, refineries, and end users. TorqBolt Inc.'s material inventory includes nickel alloys, super duplex steels, weathering steels, stainless steels, and carbon steels. The company also offers custom production of non-standard fasteners for engineering applications and infrastructure projects.
Böllhoff is a manufacturer and distributor of fasteners and connection systems that was founded in 1877 in Bielefeld, Germany. The company’s products include blind rivet nuts, washers, and screws. It also offers custom engineering, product testing, and personnel training services for clients needing additional support. The company maintains several internationally recognized certifications, including ISO 9001, 14001, and 45001 operation standards. It mainly serves the aerospace, automotive and metal fabrication markets. Some of its notable client companies include Siemens, John Deere, and Airbus.
J. C. Gupta & Sons was established in 1993 as a manufacturer and supplier of fasteners based in Bengaluru, India. The company makes JCPlas Plastite Screws, which are used for strong connections in plastics, and ALLEN Screws which are available in different coatings. There are also BAER Threading Tools, BAERCOIL and BAERFIX Thread Repair and Reinforcement inserts, taps and relevant tools, and various anchors and fixings and these tools have applications in the aerospace, mining, marine furniture, and construction industries just to name a few.
Ti Kato is based in Chiyoda-ku, Tokyo, Japan, and is a manufacturer and distributor of construction parts and components that was originally established as Kato Hardware Store in 1950. The company’s product lineup includes its Tightnik-branded specialized washers designed to resist degradation or loosening from earthquakes, its Relevel-branded custom adjustment plate designed for ventilation and ease-of-use, and its Gripper-branded secured fixture for anchor bolts designed for one-touch installation. The company’s products are commonly used in the construction, home maintenance, and DIY markets.
Howmet Aerospace Inc is a metal product design, engineering, and manufacturing company based in the United States. They were founded in 1888 in Pittsburgh, Pennsylvania. They are a publicly owned company with 27 locations in the United States and six other countries. They produce fasteners and titanium structures, as well as jet engine components and heavy truck aluminum wheels. Aerospace is their largest and fastest expanding market, with solutions ranging from the most innovative investment castings, seamless rings, extrusions, and titanium mill products to airplane fasteners.
Suraj Metal Corporation started its operations in 1973 in Mumbai, India, as a prime manufacturer and supplier of alloy stainless and nickel products. The company is devoted to provide customers with global steel procurement services. They produce industrial goods that are durable, and have the necessary proportions. Round Bars, Forging, and Fasteners are just a few of this organization's Stainless Steel and Nickel Alloys products. They are always faithful to their ideals, which are congruent with ethical business methods.
Rabourdin SAS, established in 1926 and headquartered in Centre, France, is a distributor that specializes in the fields of mold, cutting, stamping, and special screws. The company offers a variety of products, including shoulder bolts, ejector pins, and accessories for molds. It also offers sprue bushings with dowel pin fixing, which are mechanical parts used in injection molding. Its product enhanced surface hardness to improve wear and corrosion resistance through tenifer nitriding. It serves a diverse range of industries, including mold and die, machinery, fastening, lifting, and more.
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.
Ranking as of December 2024
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | Dual Machine Corp./ Klincher Locknut Corp. |
11.0%
|
| 2 | NBK America LLC |
11.0%
|
| 3 | Monroe JHP Fasteners, Inc. |
9.6%
|
| 4 | Captive Fastener Corporation |
9.6%
|
| 5 | COLOC MANUFACTURING |
8.2%
|
| 6 | Howmet Fastening Systems |
8.2%
|
| 7 | Chin Sing Precision Industry Co., Ltd |
6.8%
|
| 8 | Caliber Enterprises |
6.8%
|
| 9 | Böllhoff |
5.5%
|
| 10 | Würth Industrie Service GmbH & Co. KG |
4.1%
|
Derivation Method
The ranking is calculated based on the click share within the self-locking nut page as of December 2024. 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
|
5 | 22.7% |
|
India
|
4 | 18.2% |
|
China
|
3 | 13.6% |
Japan
|
2 | 9.1% |
|
Germany
|
2 | 9.1% |
|
Taiwan
|
1 | 4.5% |
Spain
|
1 | 4.5% |
Italy
|
1 | 4.5% |
Canada
|
1 | 4.5% |
|
France
|
1 | 4.5% |
|
United Kingdom
|
1 | 4.5% |
278 products found - Page 4
278 products - Page 4
Kishu Fastener Co., Ltd.
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