Inch Tapered Roller bearing is consist of cone and cup. Its part number is much complicate than metric tapered roller bearing. Its prefix can both indicate material and tapered roller bearing series /type, that is quite different from other type of bearing. Normally, you may see EH, EL, H, HH, JM, L, LL, LM, JLM, M PR prefix. FromIts front number, you can know its cup angle.

Detail information you can see Follows charter.

Seems almost all the bearing brand includes NSK, SKF, TIMKEN have the same part number for inch tapered roller bearing except FAG brand. You can see the difference in the follows charter:

This table only provides the normal interchange for your convenient compare. But for special application or special items, you can contact us for detail to avoid any errors or omissions.