Home > En > NSK - Bearing handbook > Formulation of bearing number
Basic numbers Auxiliary symbols
Extentnal features symbols
Symbol for design of rings
Symbol Meaning
K Symbol for design of rings
K30 Tapered bore of inner ring (Taper 1 : 30)
E Notch or lubricating groove in ring
E4 Lubricating groove in outside surface and holes in outer ring
N Snap ring groove in outer ring
NR Snap ring groove with snap ring in outer ring

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