Related Resources: mechanical-tolerances
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 |
Tolerance |
Tolerance |
Tolerance |
Tolerance |
|||||||||
|
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 |
Tolerance on |
Tolerance |
Tolerance |
Tolerance |
|||||||||
|
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")
Related Resources:
- Gauge Blocks Tolerances Specifications Table JIS B 7506
- Selection Gauge Blocks and Sine Bar
- How to Measure Screw Threads using Three Wire Method
- Dowel Pin Installation Design Tolerance Table Chart
- GD&T Geometric Dimensioning Tolerancing Basics Training
- GD&T Geometric Dimensioning Tolerancing Intermediate Training
- GDT ASME Y14.5-2009 Applications Training
- G&T Geometric Tolerancing ISO 1101 Training
- Online GD&T Fundamentals Training
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