NSK inner rings

FIR-5812-1, IR-68 and FIR-606825-1A show FIR or IR before a hyphen, followed by numbers and sometimes another ending. In the third example, 1A belongs to the full reference. Removing it or converting the numbers into an assumed dimensional formula does not establish equivalence. Compare bore, working outside surface and width with the record or drawing and the associated bearing.

In a transmission, the ring can sit on the shaft as the raceway for another component's rollers. Contact need not extend over its entire visible length. Record shoulders, side faces and bearing position relative to the ring. Replacement must preserve that relationship, not merely fit over the shaft. Photograph wear on adjacent surfaces to distinguish a seat problem from component identification.

Send MR Accesorios Industriales the code, quantity, associated bearing reference and verified ring measurements. Add side and face photographs and specify whether only the ring is required. Without readable markings, sketch bore, outside diameter and width distinctly. Show grooves or other features without assigning meanings from similar letters. Review relies on the documented arrangement rather than appearance alone.