UR - US Series - For economy in light duty applications. Rings are single turn for shaft ore bore diameters from 1/2” through 10”. A radius removal notch is on one end. The other end is square cut. Rings are axially assembled.
RR - RS Series - This series offers economy in price, space requirements and weight in medium thrust applications. These rings are rated to handle approximately twice the thrust capacity of the light duty series and 2/3 the amount of thrust load of heavy duty rings. They range in size from 1/2” to 11” shaft and bore diameters.
For maximum ease of assembly with maximum thrust capacity. This series was originally designed to fit NAS 50-51 Grooves. RRT (internal) and RST (external) thrust capacity is just below that of the Heavy Duty rings. Sizes range to fit 1/2” to 10” shaft and bore diameters (Sizes above 6” are 3-turn to facilitate assembly and removal).
Sizes range to fit 1/2” through 15” shaft and bore diameters and fit NAS 669-670 deep grooves with minimum deflection and greatest thrust capacity. RRN (internal) and RSN (external) rings require no special tools for removal. This series is covered by Aerospace standard AS3215 and AS3216 and will comply when specified on purchase order or drawing.
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