Nominal Length	Tolerances
	Calibration Grade K		Grade 0		Grade 1		Grade 2
Range	Deviation of length from nominal length any point ±te µin	Variation in length tv µin	Deviation of length from nominal length any point ±te µin	Variation in length tv µin	Deviation of length from nominal length any point ±te µin	Variation in length tv µin	Deviation of length from nominal length any point ±te µin	Variation in length tv µm
0 ≤ ln ≤ 0.4	8	2	5	4	8	6	18	12
0.4 ≤ ln ≤ 1	12	2	6	4	12	6	24	12
1 < ln ≤ 2	16	3	8	4	16	7	32	12
2 < ln ≤ 3	20	3	10	5	20	7	40	14
3 < ln ≤ 4	24	3	12	5	24	8	48	14

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Imperial Gauge Block Tolerances (BS4311:2007)