BS 5317 - Metric Length Bar Grades and Tolerances

Size mm up to (mm)	Grade 1 (µm)			Grade 2 (µm)
	Flatness	Parallelism	Length	Flatness	Parallelism	Length
25	0.15	0.16	0.2	0.25	0.3	0.4
50	0.15	0.18	0.4	0.25	0.3	0.5
75	0.15	0.18	0.4	0.25	0.35	0.7
100	0.18	0.2	0.5	0.25	0.35	0.8
125	0.18	0.2	0.6	0.25	0.4	0.9
150	0.18	0.2	0.6	0.25	0.4	1
175	0.2	0.25	0.7	0.25	0.4	1.1
200	0.2	0.25	0.8	0.25	0.4	1.2
225	0.2	0.25	0.8	0.25	0.4	1.2
250	0.2	0.25	0.8	0.25	0.4	1.2
275	0.2	0.25	0.8	0.25	0.4	1.2
300	0.2	0.25	0.8	0.25	0.4	1.2
375	0.2	0.35	1.4	0.25	0.5	2.1
400	0.2	0.35	1.4	0.25	0.5	2.2
500	0.2	0.35	1.4	0.25	0.5	2.2
575	0.2	0.4	2	0.25	0.7	3.1
600	0.2	0.4	2.1	0.25	0.7	3.2
700	0.2	0.4	2.1	0.25	0.7	3.2
775	0.2	0.5	2.6	0.25	0.8	4.1

Please Note:
1 Grades 1 & 2 bars have M10 x 1.5 threaded connecting holes except for the 10mm which has a plain hole

BS1790 – Inch Length Bar Grades and Tolerances

BS1790 - Inch Length Bar Grades and Tolerances

Size up to (inch)	Grade Inspection (µ inch)			Grade Workshop (µ inch)
	Flatness	Parallelism	Length	Flatness	Parallelism	Length
1	5	5	0	7	10	0
2	5	5	7	7	10	10
3	7	7	10	10	15	10
4	7	7	20	10	15	20
5	7	10	20	10	15	20
6	7	10	20	10	15	30
7	7	10	30	10	15	30
8	7	10	30	10	15	40
9	-	-	-
10	-	-	-
11	-	-	-
12	-	-	-
15	7	20	60	10	20	70
18	-	-	-
23	7	20	90	10	25	110

Please Note:
1. Grades Inspection & Workshop have 3/8” BSW threaded connecting holes except for the 0.5” which has a plain hole
2. Intermediate size bars are made to the same tolerances as the next larger size

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Length Bar Tolerances Metric & Imperial

BS 5317 – Metric Length Bar Grades and Tolerances

BS1790 – Inch Length Bar Grades and Tolerances

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