Length Bar Tolerances Metric & Imperial
Back to Data SheetsBS 5317 – Metric Length Bar Grades and Tolerances
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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