Spirol® Dowel Bushings provide precision alignment of mating components and shear-load protection for the bolt when installation guidelines are followed. Their hollow design permits a fastening screw or bolt to pass through the controlled inside diameter into a threaded component, isolating the bolt from shear loading and increasing joint integrity without the need for separate bolt holes. They have lead-in beveled chamfers to ease insertion and prevent skiving of the bushing during installation.

The 1-1/2 coil construction on these Spirol® Extra Light Duty Coiled Pins make them the ideal solution for fragile hole materials and the most economical solution where pin strength is not a major criterion.

Spirol® Coiled Pins are designed with a unique 2-1/4 coil, allowing them to compress evenly and distribute stress equally. They compress from the outer edge inward, so force direction does not reduce flexibility or shear strength - as loads are applied from any direction, these pins compress into a solid tube. And since flexibility, strength, and diameter must be in proper relation to each other and to the hole, EFC offers the Flared version in Standard and Heavy Duties to suit your specific needs.

Spirol® Headed Barbed Pins are specifically designed for applications that require high pull out values, or where the intent is to prevent disassembly and tampering. They are produced with the same uniformity and high CPK as the standard straight pins, conforming to ASME B18.8.2.

Spirol® Headed Knurled Pins are retained in the host by cutting into the softer host material and have a flat head.

Spirol® Headed Pins are produced with the same uniformity and high CPK as the standard straight, flat head styles. They retain themselves in the assembly by compressing the host, not the pin, and may be used as solid rivets, axles or hinge pins when axial movement in one direction must be limited.

Spirol® Metal Spacers have greater compression strength and additional bearing surface. Contact EFC International for compression specifications and bearing surface requirements based on your application, as well as for customized lengths, inside and outside diameters, gap/no gap, wall thicknesses, concentricity, or special length tolerances.

Spirol® Metal Spacers have greater compression strength and additional bearing surface. Contact EFC for compression specifications and bearing surface requirements based on your application.

Roll formed hardened Spirol® Spring Dowels accurately align mating components with respect to each other. They are formed around arbors to assure roundness, have staggered seams to prevent interlocking, and lead-in beveled chamfers ease insertion. Their outer diameter is larger than the diameter of the mounting hole, and their spring action enables them to conform to a drilled or cored hole and be self-retained.

Spirol® Slotted Spring Pins are headless hollow cylindrical tubes having a 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 toward the sides of the hole wall, providing tension in a radial manner to prevent loosening created by vibration or shock. EFC International carries Spirol® Slotted Spring Pins that meet ISO, DIN, ASME-Metric, and ASME-Inch Standards.

ASME 18.8.4M TYPE B (METRIC) SLOTTED SPRING PINS have thicker walls and a slot running the full length of the pin, allowing even compression during installation. This creates continuous pressure toward the walls of the mounting hole, providing radial tension to prevent loosening from shock or vibration.

Spirol® Solid Pins retain themselves in the assembly by compressing the host, not the pin, and are differentiated by their uniformity, consistently high CPK's, and the absence of defects such as nibs and burrs. Their chamfered ends are more consistent than tumbled edges - making automated installation more reliable. They are often used to replace ground dowels.

Spirol® Coiled Pins are designed with a unique 2-1/4 coil, allowing them to compress evenly and distribute stress equally. They compress from the outer edge inward, so force direction does not reduce flexibility or shear strength - as loads are applied from any direction, these pins compress into a solid tube. And since flexibility, strength, and diameter must be in proper relation to each other and to the hole, EFC offers the Spirol® Superflex version in Standard and Heavy Duties to suit your specific needs.