Spiral Pin

Spiral pins deliver dependable, vibration-tolerant fastening for assemblies that demand strength without sacrificing flexibility. Our spiral pins are engineered to absorb shock, maintain alignment, and protect mating components so your builds run smoother for longer. From rapid installs to long service life, our range is designed to give engineers and builders real performance advantages on the line.

Why Spiral Pins Excel in Real-World Assemblies

Our spiral pins, also called coiled spring pins, are formed from a rolled strip into a true multi-layered spiral that compresses evenly as it’s driven, then expands for secure, uniform retention. This balanced spring action spreads load across the full circumference of the hole, reducing wall damage, resisting loosening under vibration, and extending component life. 

Spiral pins shine wherever dynamic loads, thermal cycling, or repetitive shock would challenge solid pins and slotted roll pins. Their concentric, multi-coil geometry delivers consistent radial force, which helps keep tolerances consistent across large production runs and makes installation feel predictable shift after shift. The result is a fast, clean press-fit that holds tight without chewing up holes, plus a level of fatigue resistance that helps keep equipment online and maintenance intervals longer.

If your application calls for alternatives or companion fasteners, you can also explore our Rollpin for slotted-style spring pin needs, our Dowel Pin for precision solid locating, and our Taper Pin for self-locking, wedge-fit assemblies.

DIN 7343 Spiral/Coiled Spring Pins

Conforming to DIN 7343, our spiral pins are produced as multi-wrap coils that deliver superior shock absorption and flexibility compared to solid dowels. The layered design allows controlled compression during installation and elastic recovery in service, preserving hole quality and improving service life in cyclic or impact conditions.

ISO 8750 Standard-Duty Spiral Pins

Our ISO 8750 pins represent the standard-duty choice for shafts, collars, levers, linkages, and general assemblies where light to moderate shock loads are expected. They balance holding strength with ease of installation, offering a dependable, repeatable fit that supports throughput on the production floor while protecting surrounding components.

Installation & Fit

Spiral pins are designed for simple, efficient press-fit installation using common shop tools or automated stations. The concentric coil naturally guides straight entry, reducing cocking and shaving, while the uniform expansion locks the pin in place without excessive hoop stress. For service work or redesigns, the elastic recovery of the spiral form also makes removal and reinsertion more forgiving than rigid alternatives, helping teams move faster with less scrap.

Performance Under Shock & Vibration

Wherever equipment vibrates, starts, stops, or sees impact, the spiral form acts like a micro spring pack inside the hole. That cushioning effect reduces peak stresses, helps prevent fretting corrosion, and protects bores in softer materials. Over time, that translates into better alignment retention, fewer rattle-related failures, and a cleaner pathway to your reliability targets.

FAQs

What are spiral pins used for?

Spiral pins are used to join, locate, and retain components in assemblies that experience movement, shock, or vibration. Their multi-layered, coiled design delivers uniform radial tension that keeps parts aligned while cushioning dynamic loads, which helps protect the hole and extend service life in mechanisms, linkages, and shaft-mounted components.

What is the difference between a spiral pin and a roll pin?

A spiral pin is a true multi-coil spring pin with concentric layers that compress evenly and apply uniform force around the hole. A roll pin—often called a slotted spring pin—has a single longitudinal slot that creates an opening for compression but concentrates stress along the slot. In practice, spiral pins provide smoother installation, better fatigue resistance, and less hole damage under vibration, while roll pins are a good option where a traditional slotted style and lower initial cost are priorities.

Why choose a spiral pin instead of a solid dowel pin?

Solid dowel pins are rigid and excellent for precise location in static assemblies, but they transmit shock directly into the hole and require tighter tolerances. Spiral pins offer controlled compliance that absorbs impact and dampens vibration, helping to prevent hole elongation and fretting. If your application sees dynamic loads or needs a more forgiving fit with long-term reliability, our spiral pins are the smarter choice.