Slotted Spring Pins

“ Slotted Spring Pins are general purpose low cost components used in numerous fastening applications. The most appropriate applications for Slotted Pins are in non-critical assemblies manufactured out of mild to hardened steel that are manually assembled. Compressed as it is installed, the pin applies continuous pressure towards the sides of the hole wall. Unlike the Coiled Spring Pin, which radially compresses, the primary spring action of the Slotted Pin is focused on the area opposite the gap with the two halves of the pin compressing, or folding, toward the centre of the pin as it is installed. Like all Spring Pins, this allows the Slotted Pin to accommodate wider hole tolerances than rigid Solid Pins, which results in reduced manufacturing costs. ”

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Presentation

Slotted Spring Pins are headless hollow cylindrical tubes having a longitudinal slot down the entire length with chamfered or round ends to aid installation. This type of pin is produced to a controlled outside diameter slightly greater than the hole in which it will be installed. Compressed as it is installed, the pin applies continuous pressure towards the sides of the hole wall. The primary spring action of the Slotted Pin is focused on the area opposite the slot as the two halves of the pin compress during installation. This flexibility allows the Slotted Pin to accommodate wider hole tolerances than rigid Solid Pins which reduces the manufacturing cost of the host component.

SPIROL produces Slotted Pins to both the American National Standard, ASME B18.8.4M, and the International Standard, ISO 8752 (EN 28752). It is our recommendation that you consider ASME pins for all new applications and for your current applications if you are experiencing insertion problems or performance failures.

Our recommendation is based on these important advantages of ASME pins:

Lower insertion force as a result of the smaller free diameter of the pin in relation to the nominal hole. The pin is securely retained in the hole based on increased wall thickness, higher minimum hardness, and the minimal slot after insertion.
No interlocking because the maximum gap in the free diameter state is always less than the wall thickness of the pin.
Available with zinc plating for added corrosion resistance. Not only will ISO pins interlock during the plating process, but in the event that they become loose again after plating, there will be sections of the pin that are not plated. Therefore, SPIROL does not offer ISO pins with zinc plating.
Higher shear strength based on increased wall thickness, a higher minimum hardness, and narrower slots which close under load to ensure that the pins fail instantaneously rather than progressively in shear.