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Imperial Gauge Block Tolerances (BS4311:2007)

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Nominal LengthTolerances
Calibration Grade KGrade 0Grade 1Grade 2
RangeDeviation of length from nominal length any point ±te µinVariation in length tv µinDeviation of length from nominal length any point ±te µinVariation in length tv µinDeviation of length from nominal length any point ±te µinVariation in length tv µinDeviation of length from nominal length any point ±te µinVariation in length tv µm
0 ≤ ln ≤ 0.48254861812
0.4 ≤ ln ≤ 1122641262412
1 < ln ≤ 2163841673212
2 < ln ≤ 32031052074014
3 < ln ≤ 42431252484814


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