Opus Metrology

Opus Metrology
Corby NN17 4DR
England
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Opus Metrology is the trading name of Thomas Salvesen Enterprises Ltd

BS 5317 - Metric Length Bar Grades and Tolerances

 

Grades and Tolerances

Size mm up to (mm)

Calibration Grade
(m)

Grade 1
(m)

Grade 2
(m)

 

Flatness

Parallelism

Length

Flatness

Parallelism

Length

Flatness

Parallelism

Length

25

0.08

0.08

0.15

0.15

0.16

+0.40
- 0.20

0.25

0.30

+0.75
- 0.35

50

0.08

0.10

0.20

0.15

0.18

+0.60
- 0.20

0.25

0.30

+0.95
- 0.45

75

0.10

0.16

0.30

0.15

0.18

+0.70
- 0.30

0.25

0.35

+1.20
- 0.50

100

0.10

0.16

0.35

0.18

0.20

+0.85
- 0.35

0.25

0.35

+1.40
- 0.60

125

0.10

0.20

0.45

0.18

0.20

+1.00
- 0.40

0.25

0.40

+1.60
- 0.70

150

0.10

0.20

0.50

0.18

0.20

+1.10
- 0.50

0.25

0.40

+1.80
- 0.80

175

0.15

0.20

0.60

0.20

0.25

+1.25
- 0.55

0.25

0.40

+2.00
- 0.90

200

0.15

0.20

0.65

0.20

0.25

+1.40
- 0.60

0.25

0.40

+2.20
- 1.00

225

0.15

0.20

0.70

0.20

0.25

+1.40
- 0.60

0.25

0.40

+2.20
- 1.00

250

0.15

0.30

0.80

0.20

0.25

+1.40
- 0.60

0.25

0.40

+2.20
- 1.00

275

0.15

0.30

0.90

0.20

0.25

+1.40
- 0.60

0.25

0.40

+2.20
- 1.00

300

0.15

0.30

0.95

0.20

0.25

+1.40
- 0.60

0.25

0.40

+2.20
- 1.00

375

0.15

0.30

0.95

0.20

0.35

+2.40
- 1.00

0.25

0.50

+3.70
- 1.60

400

0.15

0.30

1.30

0.20

0.35

+2.50
- 1.10

0.25

0.50

+3.90
- 1.70

500

0.15

0.30

1.60

0.20

0.35

+2.50
- 1.10

0.25

0.50

+3.90
- 1.70

575

0.15

0.30

1.60

0.20

0.40

+3.50
- 1.50

0.25

0.70

+5.40
- 2.30

600

0.15

0.30

1.90

0.20

0.40

+3.65
- 1.55

0.25

0.70

+5.60
- 2.40

700

0.15

0.30

2.20

0.20

0.40

+3.65
- 1.55

0.25

0.70

+5.60
- 2.40

775

0.15

0.30

2.20

0.20

0.50

+4.60
- 2.00

0.25

0.80

+7.10
- 3.00

800

0.15

0.30

2.50

0.20

0.50

+4.60
- 2.00

0.25

0.80

+7.10
- 3.00

900

0.15

0.30

2.80

0.20

0.50

+4.60
- 2.00

0.25

0.80

+7.10
- 3.00

1000

0.15

0.30

3.10

0.20

0.50

+4.60
- 2.00

0.25

0.80

+7.10
- 3.00

Please Note:
1. Calibration Grade bars have plain, solid ends.
2. 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

 

Grades and Tolerances

Size up to (inch)

Calibration Grade
( inch)

Grade Inspection
( inch)

Grade Workshop
( inch)

 

Flatness

Parallelism

Length

Flatness

Parallelism

Length

Flatness

Parallelism

Length

1

3

3

5

5

5

+7
-7

7

10

+10
-10

2

3

4

10

5

5

+14
-7

7

10

+20
-10

3

4

7

15

7

7

+20
-10

10

15

+30
-20

4

4

7

20

7

7

+30
-10

10

15

+40
-20

5

5

10

25

7

10

+35
-15

10

15

+50
-30

6

5

10

30

7

10

+40
-20

10

15

+60
-30

7

5

10

35

7

10

+50
-20

10

15

+70
-40

8

5

10

40

7

10

+55
-25

10

15

+80
-40

9

5

10

45

-

-

-

 

 

 

10

5

10

50

-

-

-

 

 

 

11

5

10

55

-

-

-

 

 

 

12

5

10

60

-

-

-

 

 

 

15

5

10

75

7

20

+105
-45

10

20

+150
-80

18

5

10

90

-

-

-

 

 

 

23

5

10

120

7

20

+160
-70

10

25

+230
-120

24

5

10

120

-

-

-

 

 

 

30

5

10

150

-

-

-

 

 

 

31

5

10

160

7

20

+220
-90

10

25

+310
-160

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

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