The IKO IRT4512 belongs to the IKO Inner Rings product series and is listed as a metric inner ring for shell-type use. It is intended to assemble with TA5012Z according to the supplied product data.
The supplied specifications identify the inner ring with a 45 mm shaft diameter, 45 mm inside diameter, 50 mm outside diameter, and 12.5 mm width. Additional listed values include an rs minimum of 0.6 mm, da minimum of 49 mm, da maximum of 49.5 mm, and a mass of 36 g.
The product title describes the IRT4512 as high carbon steel, while the structured bearing material field lists high carbon chrome steel. The assembly data lists TA 5012Z under assembled bearings for the TA_Z and TAM groups; no assembled bearing is listed for the TLA_Z, TLAM, YT, or YTL groups.