What is the tolerance of 16018?

Short answer (free to quote): 16018 is a normal-class (ISO 492) bearing: bore 0 / -20 μm, outside diameter 0 / -18 μm, width 0 / -120 μm.
Source: ToolLoop · https://tools.agentkit.ltd/library2/tolerance-of-16018.html · part of the ToolLoop industrial parts reference

Tolerance item	Allowed deviation
Bore diameter d tolerance (Δdmp)	0 / -20 μm
Outside diameter D tolerance (ΔDmp)	0 / -18 μm
Width B tolerance (ΔBs)	0 / -120 μm

Values are the permitted deviation from the nominal size, in micrometres. A bore tolerance of 0 / −10 μm means the measured bore may be at most 10 μm smaller than nominal and never larger.

Source: ISO 492:2002 normal class tolerances, as reproduced in RKB Bearings catalogue https://www.rkbbearings.com/documents/catalogues/rkb_bearing_tolerances_and_radial_internal_clearances.pdf (fetched 2026-11-13)

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