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Coiled Spring Pins

Light Duty Coiled Spring Pins

SPIROL invented the Coiled Spring Pin in 1948. Truly an engineered fastener, the Coiled Pin is available in three duties, light, standard and heavy, to enable the designer to choose from the optimum combination of strength, flexibility and diameter to suit different host materials and application requirements. Their shock absorbing design dampens forces and vibration to prevent hole damage and prolong assembly life.

Light Duty Coiled Spring Pins are generally recommended for soft, brittle or thin materials such as plastics, aluminum, die castings, ceramics, and where holes are located close to an edge of the assembly. In situations not subjected to significant loads, such as when used purely for alignment or as an axle, light duty Coiled Pins are often used because of easy installation resulting from lower insertion force.

Application Engineering Assistance: If you would like assistance in selecting the proper diameter and duty Coiled Spring Pin for your assembly, please Request Technical Support! We are here to help!

Shop Our Light Duty Coiled Pins: For small quantities, click the Shop Now button below. For larger quantities or custom requests, please Request a Quote and one of our team members will get back to you quickly!

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Download Catalog 2D/3D
(ISO 8751, ASME B18.8.3M)

Metric Sizes - Light Duty

SPIROL's light duty metric Coiled Spring Pins conform to ISO 8751 and ASME B18.8.3M and range in diameter from 1.5mm up to 8mm. Light duty Coiled Pins are offered in high carbon steel, 302/304 nickel (austenitic) stainless steel and 420 chrome (martensitic) stainless steel.

(ASME B18.8.2)

Inch Sizes - Light Duty

SPIROL offers inch (imperial) light duty Coiled Spring Pins in diameters ranging from .062" (1/16) up to .312" (5/16). Standard materials include high carbon steel, 302/304 austenitic (nickel) stainless steel, and 420 martensitic (chrome) stainless steel. Light duty inch Coiled Pins conform to ASME B18.8.2.

Additional Coiled Spring Pin Types

Standard Duty Coiled Spring Pins
Standard Duty Coiled Spring Pins
Heavy Duty Coiled Spring Pins
Heavy Duty Coiled Spring Pins
Application Specific Coiled Spring Pins
Application Specific Coiled Spring Pins
Additional Coiled Spring Pin Options
Additional Coiled Spring Pin Options

Customizable Solutions

If you are unable to find the light duty Coiled Spring Pin in the diameter, length, material, or finish that you require within our standard offering, or if you are unsure what Coiled Pin is most appropriate for your assembly, Request Technical Support from our team and we will help you find the most cost-effective solution for your application.

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Your Total Assembly Solution

Installation Technology for Pins

In addition to a comprehensive line of engineered components used for joining and assembly, SPIROL also offers a full range of Pin Installation Equipment designed to facilitate cost-effective and high quality assembly of your products. Our installation solutions range from manual machines to fully automatic work cells with statistical process control and error-proofing options. We are the only company of our kind that offers the total integrated solution.

Explore Pin Installation Equipment

Application Success Stories

Trigger Pin in Surgical Stapler

Customer Challenge:

A leading medical device manufacturer approached SPIROL for assistance in designing a self-retaining trigger pin that eliminated cracking of the plastic yoke within the surgical stapler.

SPIROL solution:

  • SPIROL Engineers recommended a Light Duty Coiled Spring Pin which was designed specifically for plastic assemblies to ensure the perfect balance of strength and flexibility.
  • Coiled Pins are easy to install and exert low stress on the hole after installation, yet they provide exceptional retention.
  • In addition to recommending the most appropriate pin, SPIROL Engineers also recommended the hole sizes for each of the retaining locations to make sure that the assembly functioned properly over the life of the assembly.
  • SPIROL’s Coiled Spring Pin eliminated the cracking of the plastic yoke, enhanced the function of the trigger, and improved the overall quality of the surgical stapler.
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Hinge Pin in Plastic Protective Storage Case

Customer Challenge:

A manufacturer of plastic protective cases required an alternative pin to replace two single-ended barbed Solid Pins that did not provide a reliable friction fit hinge and tended to walk out of the hole. These asymmetrical pins also could not be easily oriented for automatic feeding.

SPIROL solution:

  • SPIROL Engineers recommended light duty Coiled Spring Pins designed specifically for use in plastic assemblies.
  • The enhanced flexibility of light duty Coiled Pins eases installation and exerts a constant radial force against the hole wall for superior retention.
  • The spring characteristics of light duty Coiled Pins achieve exceptional performance and maintain the desired fit and function of the hinge throughout the life of the plastic protective storage case.
  • Coiled Pins are symmetrical, have clean-cut square ends and do not interlock, thus they are conducive for automatic feeding and assembly.
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Hinge Pin in Automotive Door Handle

Customer Challenge:

A manufacturer of automotive latches was using a stacked Tubular Rivet as a hinge pin for the handle and pawl in an automotive door handle assembly. They approached SPIROL to help eliminate the BSR (buzz, squeak and rattle) that they were experiencing with the Tubular Rivet as any of these noises is unacceptable in the automotive industry. Staking the Rivet tighter resulted in cracked plastic, and looser resulted in increased buzzing and rattling.

SPIROL solution:

  • SPIROL's light duty Coiled Spring Pin is ideal for plastic assemblies because as it is inserted, the Coiled Pin flexes and conforms to the plastic hole. This protects the integrity of the plastic during insertion unlike other press-fit fasteners that are inflexible.
  • Since the Coiled Pin is self-retaining, secondary operations for retention such as staking are not necessary. Removing the staking operation saves time and money, and eliminates the issue with the plastic cracking as a result of this operation.
  • The spring-like action of the coils prevents component damage by absorbing all forces imparted onto the assembly.
  • The low insertion force, square ends and absence of slots make light duty Coiled Pins easy to automatically feed and install.
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Local Design, Global Supply.

SPIROL has Application Engineers throughout the world to assist you in your designs, supported by state-of-the-art manufacturing centers and worldwide stocking facilities to simplify the logistics of delivering your product.

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Frequently Asked Questions

Which are stronger: Coiled Spring Pins or Solid Pins?
Coiled Spring Pins have a greater shear strength than most Solid Pins because Coiled Spring Pins are heat treated and the majority of Solid Pins available on the market are not. For more information about this, read this White Paper: Coiled Spring Pins Offer a Unique Balance of Strength and Flexibility.
How do you install a Coiled Spring Pin?
Coiled Spring Pins can be installed with a hammer, press, air hammer, or automatic pin inserter. The pin size and volume of products being assembled will dictate the best assembly method. Proper fixturing is critical to ensure a successful installation, and it’s also recommended that manufacturers use a spring-loaded alignment pin for assemblies with through-holes. For more information about this, read our White Paper: How to Install a Coiled Spring Pin.
How do you remove a Coiled Spring Pin?
Coiled Spring Pins were designed to be serviceable fasteners. In assemblies with through holes, they can be removed with a punch with the same nominal diameter as the pin. The punch must have a flat, square end. In assemblies with blind holes, Coiled Pins can be removed with pliers or an electrical discharge machine. For more information about this, read our White Paper: How to Remove a Coiled Spring Pin.
Do I need to design a countersink on the hole where a Coiled Pin or Slotted Pin is being installed?
No. Both types of Spring Pins (Coiled Spring Pins and Slotted Spring Pins) have chamfers that are smaller than the hole, and they compress during the installation process to conform to the hole diameter. We only recommend edge breaks on holes where Coiled Pins and Slotted Pins are installed.
Can Coiled Spring Pins be used in plastics? Will the seam scrape / create debris?
Coiled Spring Pins can (and often are) used in plastics. In fact, Light Duty Coiled Spring Pins were specifically designed for use in plastics! Light Duty Coiled Pins exert low forces on plastic holes, extending the functional lifetime of the product. Additionally, the seam is tucked and does not make contact with the hole. That’s why Coiled Spring Pins are the fastener of choice for plastic products with hinges such as plastic door handles, plastic latches and cosmetic cases. For more information about this, read our White Paper: Clever Seam Design Makes Coiled Pin Perfect for Hinges.
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