REDWIRE Calculating the endplay take-up for bevelled rings, according to Daemar

October 22, 2020 REDWIRE is news you can use from leading suppliers. Powered by FRASERS.

Posted by Daemar Inc.


Daemar Inc.’s unsurpassed inventory of essential industrial components includes bevelled rings. In many assembly lines,... Read more

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bevelled rings

Diagram of a bevelled ring

Daemar Inc.’s unsurpassed inventory of essential industrial components includes bevelled rings. In many assembly lines, dimensional tolerances in ring thickness, groove location, or overall length of components being retained add up to a degree of clearance or endplay between the abutting surfaces of the ring and the retained part. Bevelled retaining rings benefit manufacturers as substitutes for shims, washers, and similar devices that can be expensive. These rings offer cost-saving benefits while also compensating for accumulated tolerances or wear in the retained parts.

Effective retention at minimum cost

Similar in construction to standard internal and external rings, bevelled retaining rings differ in that their groove-engaging edges are bevelled to a 15-degree angle. The rings are built for use in grooves with a corresponding 15-degree bevel on the load-bearing groove wall. When a user installs a bevelled ring in its groove, it serves as a wedge between the outer groove wall and the part being retained. When there is endplay between the ring and the abutting face of the retained part, the ring’s spring action makes the fastener seat more deeply in the groove, which compensates for endplay.

To determine whether bevelled rings will work in assemblies, a user must compare the total tolerance of the assembly with the capability of the ring to fulfill the requirement. This fulfillment is achieved when the ring seats anywhere between halfway down to all the way down in the groove, depending on the tolerance buildup in a particular assembly. The formula: Ring take-up = d/2 tan 15° ≥ ∆A + ∆B + ∆U.

The recommended procedure for calculating groove location for Daemar bevelled rings:

  • A¹ ≥ B max+ U max+ d/2 tan 15°
  • A² ≤ B min+ U min+ d tan 15°

The bevelled edge width should be used only for calculating the groove location and take-up requirement. The user should not try to measure this dimension directly, as the point at which the measurement should be taken is not clearly defined due to the blanking crown and die clearance taper on the ring edge.

For more information, contact Daemar.


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Posted by Daemar Inc.


Daemar Inc.’s unsurpassed inventory of essential industrial components includes bevelled rings. In many assembly lines,... Read more

Contact supplier