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This section provides an overview for spring pins as well as their applications and principles. Also, please take a look at the list of 15 spring pin manufacturers and their company rankings. Here are the top-ranked spring pin companies as of January, 2025: 1.Hartford Technologies, Inc., 2.Amtek Tool & Supply, 3.Bay Bolt.
Table of Contents
A spring pin is a hollow pin made by bending a thin plate into a cylindrical shape and applying a mortise (slit process) to it to form a C-shaped cross-section.
Because it is hollow, it is lighter than a solid pin. It is inserted into a hole, with a hole diameter slightly smaller than the pin's outer diameter, and used to fix or constrain rotation by spring force as the pin expands outward.
Generally, it is also used synonymously with a rolling pin, tension pin, etc.
Spring pins are used for locating, preventing rotation, and retaining parts. Since the spring force of the pin acts to secure the part, high hole diameter accuracy is not required. The pin can be adequately secured in drilled holes without reaming. Therefore, it is easier to use than solid parallel pins or tapered pins. The spring force also makes them less likely to drop out against vibration.
There are two main types of springs, one for general use (straight) and the other for light-load use (corrugated), which are used according to their respective characteristics.
The general-use springs are used for simple fastening and positioning. Slits are available in straight and corrugated types, and both ends are tapered or R-processed to facilitate insertion into holes.
The light-load type is a simpler type of fastening that requires less load to insert than the general type. This is used for lightweight materials such as aluminum and resin that do not require high strength. Slits are corrugated and less prone to tangling, making them suitable for automatic insertion.
Refer to the figure below for an example of spring pin use (fastening of shaft and pinion gear to prevent rotation).
Cable gland, refer to the following for an example of spring pin selection.
The main feature of spring pins is that they can be inserted into a machined hole with a hole diameter slightly smaller than the pin’s outer diameter. They can be fixed or rotationally restrained by the spring force that causes the pin to spread outward. Therefore, high-precision hole diameters are not required, and finishing processes such as reaming can be omitted. The pins can then be used as drilled holes, resulting in fewer processes and lower manufacturing costs.
However, they have lower shear strength than solid parallel pins and tapered pins and are not suitable for high load and high precision fasteners. If more strength is required, two pins with different outer diameters can be used in combination.
Care should be taken when using this method because the pin can easily come loose if vibrations occur in a direction parallel to the pin's axial direction. Also, if the fastener is repeatedly rotated, the pin will easily come loose, so care is required.
To insert a spring pin, lightly tap the end face of the pin with a hammer or the like. If the spring pin is difficult to insert, slightly increase the hole diameter for fine adjustment. To pull out the spring pin, place a pin punch or similar tool on the end of the pin, tap it lightly with a hammer, etc., and pull it out.
*Including some distributors, etc.
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Huyett, established in 1906 and headquartered in Houston, Texas, is an ISO 9001:2015 certified manufacturer of industrial fasteners and related products. The company offers an array of pins like cotter pins and spring pins, retaining rings such as external and internal rings, key stock in shapes like square and hexagonal, various types of grease fittings, and a range of O-rings including buna-n, viton, and silicone varieties. These components serve diverse applications in securing, aligning, transmitting torque, reducing friction, and sealing against leakage in machinery and structures.
Hartford Technologies was founded in 1926 in Hartford, Connecticut and is currently headquartered in the suburbs of Hartford in Rocky Hill. The ISO 9001 certified company is a manufacturer of custom bearings and assembly solutions for the automotive, agriculture, medical, and other industries. The company has four primary product categories: Custom Bearings & Components, Precision Balls, Bearing Parts, and Precision Pins, Shafts, and Rollers. The company’s manufacturing and service capabilities include prototype development, 3D modeling, technical support including inventor management, and quality control systems.
SPIROL International Corporation, established in 1948, and headquartered in Danielson, Connecticut, is a manufacturer and supplier that specializes in providing engineered fastening solutions. Their diverse product range includes precision coiled and slotted spring pins, solid pins, compression limiters, and threaded inserts used for various applications in automotive, aerospace, medical, and general industrial sectors. SPIROL's adherence to quality is evident through its ISO 9001 and IATF 16949 certifications, ensuring solutions for their customers' assembly challenges.
DRIV-LOK, founded in 1940 and headquartered in Sycamore, Illinois, USA, is a manufacturer of fastening products. The company offers a comprehensive range of unique products, including self-locking fasteners, retaining rings, and push-on nuts. The solutions provide secure and efficient assembly, reducing the risk of loosening and improving product stability. These products find immense applications in industries such as automotive, aerospace, electronics, and industrial manufacturing. With precision engineering, it offers advanced fastening solutions that enhance the performance and integrity of various products, meeting the evolving demands of various industries.
APEX FASTENERS, Inc, established in 1993 and headquartered in California, United States, is a manufacturer and supplier of quality fastening solutions. Specializing in a diverse range of industrial fasteners, including screws, bolts, nuts, and rivets, APEX FASTENERS, Inc serves as a vital link in assembling and securing various structures. Their engineered products find applications in industries spanning aerospace, automotive, construction, and electronics. With a pledge to quality and reliability, the company's contributions facilitate seamless and robust connections, underpinning the integrity of countless projects and products across the globe.
Bay Bolt was founded in 1981 and is based out of Oakland, California. The company produces fasteners and other components according to ASTM and SAE standards from materials including medium carbon steel, Alloyed steel, and atmospheric corrosion-resistant steel. They are commonly used in construction, waterworks, and underground situations. The company’s spectrum of fastener products includes bolts, nuts, washers, screws, and socket products. The company’s threaded fasteners cover 19 styles of fasteners, many designs of nuts and washers, and over 8 head styles.
Wrought Washer, established in 1905 and headquartered in Milwaukee, Wisconsin, USA, is a manufacturer and supplier of standard and special washers. The company’s product range includes standard washers such as flat washers, spring washers, lock washers, and split washers, as well as special washers tailored to meet unique customer specifications. These products cater to diverse industries, including automotive, construction, electrical, agriculture, and material handling. Its services include manufacturing, testing and certification, supply chain management, and technical support. Devoted to delivering quality washers and services, the company holds ISO 9001:2015 certification.
Engineered Source Inc was founded in 1990 and operates out of Orange, California. Engineered Source Inc is a distributor of precision parts for numerous industries including automotive manufacturers, construction, electronics & robotics, fabrication & assembly, farm & agricultural equipment, gun manufacturers, marine & water treatment, medical manufacturers, and aerospace. Examples of specific products include custom internally threaded square pins, stainless steel pins, steel hex nuts, short dog point socket set screws, zinc plated steel material, custom stamped L brackets, painted self-drilling screws, and custom-locating dowel pins for transit gear units.
Rego Electronics Inc. is a manufacturer and distributor of interconnectivity and thermal management products that was established in 1979 in Taipei, Taiwan. The company offers its PCI Express series high speed connectors for data storage or transmission devices, its CFexpress card connectors for cameras and video recorders, and DDR5 memory card connectors utilizing the latest iteration of DDR technology. The company is ISO 9001, ISO 14001, and IATF 16949-certified, and chiefly serves clients in the communications sector.
Amtek Tool and Supply, Inc. based in Madison Heights, MI. Amtetk is an online super market for tools, supplies, and other hardware for individual, professional, and corporate customers. Product types include milling, threading, and turning devices, tooling systems, saws, broaching and deburring bits, cutting tool blanks and spares, abrasives, power tools, hand tools, safety equipment, measuring devices, lubrication, sanitation supplies, storage, pneumatics, shipping supplies, transmissions, and various other hardware and shipping supplies. Amtek’s online storefront offers precise filters to help find exact products to meet customer needs.
Nationwide Industrial Supply was founded in Youngstown Ohio in 2006. Nationwide Industrial Supply is a distributor of industrial equipment, serving both public and private institutions and companies in the United States and overseas. Some of Nationwide’s offerings maintenance, operating products, safety supplies repair products, storage equipment, tubing, pipe, and hose material, electrical and plumbing supplies repair and operating products, storage equipment, safety supplies, material handling equipment, shelving, and work platforms.
TFC Europe Ltd, founded in the UK in 1981, is a supplier of engineering fastener products. The company offers an extensive selection of bolts and nuts in various sizes, materials, and grades to accommodate different mechanical and construction projects, a diverse range of screws, including machine screws, wood screws, self-tapping screws, and concrete anchors and wall anchors, designed to securely fasten objects to various surfaces. It has ISO 9001:2015 and Aerospace AS9100d & AS9120 certifications.
Ranking as of January 2025
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | Hartford Technologies, Inc. |
13.2%
|
| 2 | Amtek Tool & Supply |
10.7%
|
| 3 | Bay Bolt |
9.1%
|
| 4 | Wrought Washer Manufacturing, Inc. |
8.3%
|
| 5 | Engineered Source, Inc. |
8.3%
|
| 6 | DRIV-LOK |
7.4%
|
| 7 | APEX FASTENERS, Inc |
7.4%
|
| 8 | Nationwide Industrial Supply |
7.4%
|
| 9 | REGO ELECTRONICS INC |
5.8%
|
| 10 | Reid Supply |
5.0%
|
Derivation Method
The ranking is calculated based on the click share within the spring pin page as of January 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
|
9 | 81.8% |
Japan
|
1 | 9.1% |
|
United Kingdom
|
1 | 9.1% |
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