Groov-Pins are widely used in hinge and axle applications where the grooved section locks the pin in place and the un-grooved portion of the pin becomes the bearing surface. By choosing an appropriate type, the pin may be captured at the end or in the center. If the pin is to be captured in the center, it is recommended that the hole size in the center element be the nominal diameter of the pin and that the center element contain a length of pin equal to at least two pin diameters. The yoke should avoid the grooves which extend along the central portion of the pin. If the pin is captured at the end, it is recommended that the yoke members be at least one pin diameter thick and that the center element avoid grooves near the end.

A hole in a shaft should not exceed one-third of the shaft diameter, otherwise the shaft becomes too weak. Pin material and diameter should be selected so that the pin will shear before the shaft fails. When using the shear strength data in this brochure, remember that the shaft diameter must be at least two pin diameters and that the pin must extend at least one pin diameter from the shaft. A safety factor of 8 has been assumed.

Groov-Pins are engineered fasteners which play an important role in assembly design. Whether a pin of of standard design is needed or one with special requirements, take advantage of the Customer Service Engineering Department. This responsive group of problem solvers is available to discuss special design needs and to help select the proper pin type for an application. Together with the factory-trained direct sales force, they form an experienced team to provide support through the entire design cycle.

No engineering design is complete without evaluating the application with the actual pin or an equivalent substitute. Customer Service Engineering is available to help define and obtain samples for test and evaluation.

Special design requirements will be reviewed promptly by our engineers to provide feedback and recommendations. Contact Customer Service Engineering with any questions concerning alternate materials, finishes, straightness, or end configuration requirements. For a detailed discussion, a print can be faxed to us at (201) 933-8902.

The Shear Strength Table shows the force required to shear low-carbon steel, corrosion-resistant steel, and heat-treated alloy steel Groov-Pins when loaded in double shear using a fixture as described in the 'Double Shear Test' section.

The Shear Strength Table details information including Shaft Size, Maximum Torque, and Horsepower Transmission.

Click here to view the Shear Strength Table and Double Shear Test

Optimum results are obtained, under average conditions, with a drill size equivalent to the nominal diameter of the Groov-Pin or Drive Stud.

In applications involving work material appreciably harder than the pin material, the hole edge should be chamfered to avoid shearing of the expanded pin section.

Tolerances above the basic hole diameter are acceptable following the guidelines shown in the figure at right. Relaxed tolerances shown apply generally to steel pins with length to diameter ratios greater than 4 to 1 and less than 10 to 1. Where locking requirements are not critical, hole tolerances can be further relaxed. Conversely, tolerances for very short pins or very short groove lengths should be held close to the nominal hole diameter.

For detailed measurements of insertion forces according to pin diameter and groove length, please consult the Grooved Pin Insertion Forces Chart.

Our grooved pins can be made to meet the following specifications and standards:

• Standard ASME B18.8.2
• NASM 35671 - NASM 35678
• NASM 51605
• DIN
• ISO

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