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Coiled Spring Pins

SPIROL invented the Coiled Spring Pin and its production technology in 1948. Since that time, the Coiled Pin has proven to be the most versatile Spring Pin in the industry. Easily recognised by its unique 2 1/4 coil cross-section, Coiled Pins are self-retaining fasteners achieved by radial tension applied against the hole wall, and they are the only press-fit pins designed to remain flexible after installation. More than fasteners, SPIROL Coiled Pins are shock-absorbing elements that are integral, active components of a total assembly. Coiled Spring Pins are available in three duties, light duty, standard duty and heavy duty, to enable the designer to select the right combination of strength, flexibility and diameter to suit different host materials, strength requirements and loading types. SPIROL Coiled Pins typically offer the lowest installed cost in most applications.

Otherwise known as Spiral Pins, Coil Pins, Roll Pins or simply Spring Pins, SPIROL offers Coiled Spring Pins in both inch and metric sizes in a variety of materials and finishes from 0.8mm / .031” (1/32) in diameter up to 20mm / .750” (3/4) in diameter. Select from our expansive standard offering, or take advantage of our complimentary Application Engineering support and allow us to work with you to help determine the most appropriate Coiled Pin for your specific application and assembly needs!

If installation equipment is required, SPIROL also offers a standard comprehensive line of Pin Installation Equipment from manual to fully automatic modules, with or without out fixturing, to support your Coiled Pin assembly requirements.

Coiled Spring Pin Types

Coiled Spring Pins are commonly used as hinge pins and pivots, for locating and alignment, attaching a gear to a shaft / collar, and for fastening two or more components together.

SPIROL offers Coiled Spring Pins in three different duties, light duty, standard duty and heavy duty, to match the required strength and flexibility for each application. A pin too strong for the applied force will not flex and can cause damage to the hole. A pin too flexible could prematurely fatigue in the application. The Coiled Pin with the optimal combination of strength, flexibility and diameter will result in the prolonged useful life of an assembly. Generally speaking, light duty Coiled Pins are used in plastic and other soft, brittle or thin materials, standard duty Coiled Pins are used in mild steel and non-ferrous host materials, and heavy duty Coiled Spring Pins are used in hardened materials where space prohibits the use of a larger diameter standard duty pin.

SPIROL also offers a selection of Coiled Pins designed for common application-specific requirements such as cosmetic cases, key fobs, head rests, transmissions, card locks and ejector clips. If one of SPIROL's standard Coiled Spring Pins does not meet your needs, our Application Engineers will work with you to design a custom Coiled Pin to meet your unique requirements.

Select from the options below for more specificity about SPIROL's Coiled Pin offering or contact us for complimentary technical support!

Don’t See What You’re Looking For?

Need help choosing the most appropriate fastening solution for your application? SPIROL's expert engineers will review your specific requirements, and design the most cost-effective Coiled Spring Pin to meet your technical and commercial needs. Let us help!

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Pin Duties Material Type Material Grade Hardness, Vickers Finishes
M  Standard
High Carbon Steel UNS G10700 / G10740
C67S (1.1231) / C75S (1.1248)
HV 420 - 545
Plain, Oiled
Electroplated, Zinc
Alloy Steel UNS G61500
51CrV4 (1.8159)
HV 420 - 545
Stainless Steel, Austenitic (Nickel) UNS S30200 / S30400
18-8 (1.4310)
Work Hardened
Stainless Steel, Martensitic (Chrome) UNS S42000
X30Cr13 (1.4028)
HV 460 - 560

TO ORDER: Product Code / Diameter / Length / Duty / Material / Finish

Full Specifications

Unique Features & Benefits

Only Coiled Pins utilise the coiled spring concept; a recognised superior pin design. This imparts to SPIROL Coiled Spring Pins unique features not found in other Spring Pins or Solid Pins. More than fasteners, SPIROL Coiled Pins are shock-absorbing elements that are integral, active components of a total assembly. There are other pinning methods, but when the total assembly's manufacturing cost, quality and useful life are important, the pin of choice is the SPIROL Coiled Spring Pin.

Features Include:
  • Absorbs Shock and Vibration
  • Uniform Strength and Flexibility
  • Equal Stress Distribution
  • Swaged Chamfers
  • Square Ends
Features & Benefits
Other Advantages:
  • Closer Diameter Tolerances
  • Conforms to Hole
  • Lower Insertion Pressure – Radial Tension
  • Wider Range of Duties, Diameters and Materials
  • Wider Hole Tolerance Range
  • Straightness
  • Automatic Feeding
  • Reusable
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

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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Have a manufacturing issue you can't solve? Our engineering experts love a challenge. Recommending efficient solutions for your application requirements is what we do best. Give us a call or fill out the form below to connect with us!

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