Bearing Tolerances (Precision Bearings) Information
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Abec 1 or ISO P6 gradings apply to all precision bearings in our catalogue made from
SAE52100 or 440C Stainless Steel unless otherwise specified. The section of our bearing part number that specifies the grade is found near the end, preceded by the country of manufacture code. The Info Sheet details the section of our coding that deals with bearing precision, and also the tolerances applicable to bearing ranging from ISO P0 to ISO P2, and ABEC1 to ABEC9P.
The tolerances in the charts relate to Mean Bore Deviation, Bore Deviation Limits, Width Deviation, Maximum Side Deviation from Parallel, Track Parallel with Side, Bore Squareness with Side, and Eccentricity of Tracks.