What is a spring split pin?

What is a spring split pin?

Split spring pin, also known as cylindrical pin, is a headless hollow cylindrical body, axially slotted, and chamfered at both ends. It is used for positioning, connection and fixing between parts; it needs to have good elasticity and resistance to Shear force, the outer diameter of these pins is slightly larger than the mounting hole diameter.

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Since its establishment, the company has been taking the road of professional development, and has established long-term cooperative relations with well-known domestic auto parts manufacturers. High trust!


We have a patent certificate for springs, and have the ability to develop products together with customers. Some products can provide free samples to customers.


We have 30 years of manufacturing and R&D experience. It has passed the IATF 16969 automotive quality management system, and has more than 200 sets of professional spring equipment, which can guarantee the quality.

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After-sale service and technical assistance: company provides after sales service and technical assistance as per customers' requirement and needs with response within 24 hours.

about Heli Spring

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Wenzhou Heli Spring Manufacturing Co., Ltd. was founded in 1992. It is a high-quality spring manufacturing enterprise integrating design, production, sales and service. The current products include: compression springs, torsion springs, extension springs, auto parts springs, wire forming springs and spring sheets, etc.

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How do you use a spring cotter pin?

  1. Step 1: Choose the right size cotter pin.
  2. Step 2: Optional, Drill a hole in the bolt.
  3. Step 3: Insert the cotter pin in the bolt hole.
  4. Step 4: Bend the split ends of the cotter pin.
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Frequently Asked Question

Do you have any question?

Cotter pins are wire formed pins with two prongs that separate during installation. They are used as a locking device to hold pins or castle nuts in place. These low-cost and highly versatile fasteners are used virtually everywhere.

A head on one end acts as a stop, while a hole punched through the opposite end can be fitted with a cotter pin or simply tied off or moused to keep the clevis pin in place. A spring pin is formed with a groove or slot, allowing the pin to fit into holes of a smaller diameter than the pin itself.

Also known as a split pin, a cotter pin is a simple fastener that's used to secure a bolt — or any other rod-shaped fastener — in place. As shown in the adjacent image, cotter pins consist of a narrow U-shaped piece of metal with a flared and circular top.

A spring cotter pin is a mechanical part, also known as a spring pin, elastic pin, spring snap ring, which is often used to connect two parts or fix parts. It is usually made of spring steel with open or round rings and is elastic. Such a part can be joined by inserting it into a shaft hole or hole and then rotating it 90 degrees to lock it in place. Due to its elasticity, it can withstand axial and radial loads to a certain extent, making the connection more robust. Spring cotter pins are widely used in various mechanical equipment, such as automobiles, bicycles, furniture, etc.

Machinery manufacturing industry: spring cotter pins are often used in various equipment and machinery in the machinery manufacturing industry, such as construction machinery, textile machinery, packaging machinery, etc. Automobile manufacturing: Spring cotter pins are widely used in various vehicles and parts in the automobile manufacturing industry, such as car seats, doors, windows, engines, etc. Furniture manufacturing: Spring cotter pins can be used for various furniture in the furniture manufacturing industry, such as chairs, tables, cabinets, etc. Electronic manufacturing: Spring cotter pins can also be used in various equipment and parts in the electronics manufacturing industry, such as computers, mobile phones, cameras, etc.

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