Coiled Spring Pin Vs Slotted Spring Pin

Comparatively slotted pins compress by closing the slot and stress is concentrated 180 degrees opposite the slot.

Coiled spring pin vs slotted spring pin. They also have higher dynamic load capacities and accommodate wider hole tolerances. Spring pins are also easy to insert and remove. I recently needed to buy some coiled tension pins. They re manufactured to an oversize dimension so that when the pin is inserted into a hole radial forces are exerted that hold the spring pin in place.

Also called a roll pin the spring pin withstands side loads and rotational friction making it ideal for securing shaft and axle connections. Coiled spring pins are flexible after installation so they absorb shock and vibration better than slotted spring pins. Spirol coiled pins spread compressive stress over the entire pin and do not have stress point concentrations. Coiled spring pins have a body diameter larger than the recommended hole diameter and chamfers on both ends to facilitate starting the pin into the hole the spring action of the pin allows it to compress as it assumes.

When spirol coiled pins are installed the compression starts at the outer edge and moves through the coils toward the center. Coiled spring pins are flexible after installation so they absorb shock and vibration better than slotted spring pins. A spring pin is a hollow split dowel pin that exerts uniform outward pressure when fitted into a nut or shaft hole. The coiled tension pins had been factory installed on my troybuilt horse model tiller.

The coiled pin is a self retaining fastener which works in a similar manner to a slotted pin but the design allows for the stresses to distribute equally across the coils after insertion. Also known as c pins slotted spring pins consist of rolled strips of steel iron aluminum or other metals that expand upon insertion. They also have higher dynamic load capacities and accommodate wider hole tolerances. Slotted coiled spring or hollow pins are economical universally used shear type fasteners that are self locking.

They rely on the same principle of compression as coiled spring pins but they feature simpler design. Removing one of the coiled tension pins using a pin punch it was removed easily. I drove to several big box stores and hardware stores to find. Actual diameters are slightly larger than the diameters shown allowing pins to fit tightly when installed.