Gauge Blocks Tolerances Specifications Table ASME B89.1.9

Tolerances, Engineering Design & Limits & Fits

Accuracy Specifications of Gage Blocks by ASME B89.1.9 (USA) at 20˚C.

ASME B89.1.9 standard specifies the most important design and metrological characteristics of gage blocks with a rectangular or square cross-section and a nominal length l n ranging from 0.5 mm to 1000 mm for metric sizes and 0.0010 in. to 40 in. for inch sizes. Limit deviations and tolerances are stated for the calibration Grade K and for the Grades 00, 0 , AS-1, and AS-2 for various measuring purposes.

Nominal length (mm)

Grade K

Grade K

Grade 0

Grade 1

Grade 2

Tolerance
on length

at any point

Tolerance
on length

at any point

Tolerance
on length

at any point

Tolerance
on length

at any point

Tolerance
on length

at any point

Rectangular

Square

over 0.5

up to 50

+0.05

-0.05

+0.05

-0.05

+0.05

-0.05

+0.1

-0.1

+0.15

0.15

+0.25

-0.25

over 50

up to 150

+0.05

-0.05

+0.05

-0.05

+0.07

-0.07

+0.1

-0.1

+0.15

-0.15

+0.25

-0.25

over 150

up to 500

+0.1

-0.1

+0.1

-0.1

+0.1

-0.1

+0.15

-0.15

+0.18

-0.18

+0.25

-0.25

over 500

up to 1000

+0.15

-0.15

+0.15

-0.15

+0.15

-0.15

+0.18

-0.18

+0.20

-0.20

+0.25

-0.25

Accuracy of Gauge Blocks by at 68 ˚C.

Nominal length (mm)

Grade K

Grade K

Grade 0

Grade 1

Grade 2

Tolerance
on length

at any point

Tolerance on
length

at any point

Tolerance
on length

at any point

Tolerance
on length

at any point

Tolerance
on length

at any point

Rectangular

Square

over 0.01

up to 2

+2

-2

+2

-2

+2

-2

+4

-4

+6

-6

+10

-10

over 2

up to 6

+2

-2

+2

-2

+2

-2

+4

-4

+6

-6

+10

-10

over 6

up to 20

+4

-4

+4

-4

+4

-4

+6

-6

+7

-7

+10

-10

over 20

up to 40

+6

-6

+6

-6

+6

-6

+7

-7

+8

-8

+10

-10

 

B Grade
Grade 00
Grade 0
Grade AS1
Grade AS2
Size
Size Tolerance
Variation in Length
Flatness
Size Tolerance
Variation in Length
Flatness
Size Tolerance
Variation in Length
Flatness
Size Tolerance
Variation in Length
Flatness
Thru .050 in.
±4
2
2
±6
4
4
±12
6
6
±24
12
10
(0.5mm)
(±.10)
-0.05
-0.05
(±.15)
-0.1
-0.1
(±.30)
-0.16
-0.15
(±.60)
-0.3
-0.25
Thru .400 in.
± 3
2
2
±5
4
4
±8
6
6
±18
12
10
(10.0mm)
( ± .077)
-0.05
-0.05
(±.12)
-0.1
-0.1
(±.20)
-0.16
-0.15
(±.45)
-0.3
-0.25
Thru 1.000 in.
± 3
2
2
±6
4
4
±12
6
6
±24
12
10
(25.0mm)
( ± .07)
-0.05
-0.05
(±.15)
-0.1
-0.1
(±.30)
-0.16
-0.15
(±.60)
-0.3
-0.25
Thru 2.000 in.
± 4
2
2
±8
4
4
±16
6
6
±32
12
10
(50.0mm)
( ± .10)
-0.06
-0.05
(±.20)
-0.1
-0.1
(±.40)
-0.18
-0.15
(±.80)
-0.3
-0.25
Thru 3.000 in.
± 5
3
Rect 2 (.05)
±10
4
4
±20
6
6
±40
14
10
(75.0mm)
( ± .12)
-0.06
Sqr 3 (.07)
(±.25)
-0.12
-0.1
(±.50)
-0.18
-0.15
(±1.0)
-0.35
-0.25
Thru 4.000 in.
± 6
3
Rect 2 (.05)
±12
5
4
±24
8
6
±48
14
10
(100.0mm)
( ± .15)
-0.07
Sqr 3 (.07)
(±.30)
-0.12
-0.1
(±.60)
-0.2
-0.15
(±1.2)
-0.35
-0.25
Thru 5.000 in.
± 8
3
Rect 2 (.05)
±16
5
4
±32
8
6
±64
16
10
(125.0mm)
(±.20)
-0.08
Sqr 3 (.07)
(±.40)
-0.14
-0.1
(±.80)
-0.2
-0.15
(±1.6)
-0.4
-0.25
Thru 6.000 in.
±8 / -8
3
Rect 2 (.05)
±16
5
4
±32
8
6
±64
16
10
(150.0mm)
(±.20)
-0.08
Sqr 3 (.07)
(±.40)
-0.14
-0.1
(±.80)
-0.2
-0.15
(±1.6)
-0.4
-0.25
Thru 7.000 in.
±10
4
4
±20
6
6
±40
10
7
±80
16
10
(175.0mm)
(±.25)
-0.09
-0.1
(±.50)
-0.16
-0.15
(±1.0)
-0.25
-0.18
(±2.0)
-0.4
-0.25
Thru 8.000 in.
±10
4
4
±20
6
6
±40
10
7
±80
16
10
(200.0mm)
(±.25)
-0.09
-0.1
(±.50)
-0.16
-0.15
(±1.0)
-0.25
-0.18
(±2.0)
-0.4
-0.25
Thru 10.000 in.
±12
4
4
±24
6
6
±48
10
7
±104
18
10
(250.0mm)
(±.30)
-0.1
-0.1
(±.60)
-0.16
-0.15
(±1.2)
-0.25
-0.18
(±2.4)
-0.45
-0.25
Thru 12.000 in.
±14
4
4
±28
7
6
±56
10
7
±112
20
10
(300.0mm)
(±.35)
-0.1
-0.1
(±.70)
-0.18
-0.15
(±1.4)
-0.25
-0.18
(±2.6)
-0.5
-0.25
Thru 16.000 in.
±18
5
4
±36
8
6
±72
12
7
±144
20
10
(400.0mm)
(±.45)
-0.12
-0.1
(±.90)
-0.2
-0.15
(±1.8)
-0.3
-0.18
(±3.6)
-0.5
-0.25
Thru 20.000 in.
±20
6
4
±44
10
6
±88
14
7
±176
24
10
(500.0mm)
(±.50)
-0.14
-0.1
(±1.1)
-0.25
-0.15
(±2.2)
-0.35
-0.18
(±4.4)
-0.6
-0.25

Grade B or "Toolroom Grade" which typically means the gage blocks tolerances are ± / - Fifty millionths (.000050")

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