Opus Metrology

Engineer’s Parallels - Grades and Tolerances

Metric Parallels Part 1

Dimensions (mm)

Units 0.001mm

Grade A

Grade B

Caliper measurements  for individual parallels

Functional Requirements

Caliper measurements  for individual parallels

Functional Requirements

Individual

Pairs

Individual

Pairs

Thickness T

Width W

LengthL

Departure from Nominal T & W

Variation in Caliper Measurements of T & W

Parallelism of T & W

Matching

Departure from Nominal T & W

Variation in Caliper Measurements of T & W

Parallelism of T & W

Matching

5

10

100

5

2

4

6

10

4

8

12

10

20

125

5

2

4

6

10

4

8

12

15

30

150

5

2

4

6

10

4

8

12

20

40

200

5

2

4

6

10

4

8

12

25

50

250

10

3

6

10

20

6

12

20

30

60

300

10

3

6

10

20

6

12

20

Imperial Parallels Part 2

Dimensions (inches)

Units 0.000 1inch

Grade A

Grade B

Maximum Permissible Errors for Each Parallel

A pair of Parallels shall have equal Thickness (T) and Width (W) to within

Maximum Permissible Errors for Each Parallel

A pair of Parallels shall have equal Thickness (T) and Width (W) to within

Thickness T

Width W

LengthL
(Minimum)

Tolerance on T&W

Variations in T&W Not to Exceed

Error in Straightness within

Tolerance on T&W

Variations in T&W Not to Exceed

Error in Straightness within

4

1.0

0.5

0.5

0.5

2.5

1.0

1.0

1.0

6

1.0

1.0

1.0

1.0

2.5

1.5

1.5

1.5

1

6

1.0

1.0

1.0

1.0

2.5

1.5

1.5

1.5

1

8

1.5

1.5

1.5

1.5

4.0

2.0

2.0

2.0

1

2

10

1.5

1.5

1.5

1.5

4.0

2.5

2.5

2.5

1

2

10

2.0

1.5

1.5

1.5

5.0

2.5

2.5

2.5

1

3

12

2.0

2.0

2.0

2.0

5.0

3.0

3.0

3.0

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England
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