Tapered roller bearings

A tapered roller bearing carries combined radial and axial loads, with thrust in one direction only. The cone and cup come apart, are installed separately and have their clearance set during assembly, which makes the arrangement stiff. Wheel shafts, gearboxes and transmissions, differentials, pumps and construction equipment use them, nearly always as opposed pairs.

Designations change from brand to brand. Under the ISO metric system, part numbers like 30203-XL (FAG), 4T-30203 (NTN) or HR 30206 J (NSK) begin with the 302, 303, 320, 322 or 329 series. From 04 up, multiply the last two digits by 5 for the bore: 30206 has a 30 mm bore. Timken uses letter codes for construction type, with TS and TSF for single row and TDI and TDO for double row. For SKF sets such as 305269 D or 305183, the number identifies the whole set and is quoted as such.

Weigh the direction and size of the thrust load, the speed, the shaft and housing fits, and the preload or end play the arrangement needs. A steeper contact angle carries more thrust, and double row designs handle shafts loaded in both directions. When replacing, order cone and cup as a matched pair, with the full part number of each.

Brands we carry: Timken, NSK, NTN, FAG and SKF. For a quote, send us by WhatsApp the cone and cup part numbers, or the bore, outside diameter and width, plus the bearing you are replacing. We'll quote it and show you the equivalents across brands.