Home > En > NSK - Bearing handbook > Formulation of bearing number
Basic numbers Auxiliary symbols
Internal design symbols
Symbol Meaning
a Internal design differs from standard one.
j Smaller diameter of outer ring raceway, contact angle, and outer ring width of tapered roller bearings conform to ISO.
(For high-capacity bearings)
C, CA, CD, H Spherical roller bearings
E Cylindrical roller bearings spherical thrust roller bearings
HR (2) Tapered roller / Bearings

Note (2): HR is prefix to bearing series symbols.

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