Gage Block Tolerances


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Standards of Accuracy
English System: Tolerances expressed in microinches (.000001") 1 millionth of an inch
Lab. Master
FED.* GRADE 0-5
Webber AA
FED.* GRADE 1
Webber A1
FED.* GRADE 2

Webber A
FED.* GRADE 3

Length of Block (Inches)
Tolerance (Length)
Flatness & Parallelism
Tolerance (Length)
Flatness & Parallelism
Tolerance (Length)
Flatness & Parallelism
Tolerance (Length)
Flatness & Parallelism
Through 1"
±1
1
±2
2
+4 –2
4
+8 –4
5
2"
±1
1
±4
2
+8 –4
4
+16 –8
5
3"
±1
1
±5
3
+10 –5
4
+20 –10
5
4"
±1
1
±6
3
+12 –6
4
+24 –12
5
5"
±7
3
+14 –7
4
+28 –14
5
6"
±8
3
+16 –8
4
+32 –16
5
7"
±9
3
+18 –9
4
+36 –18
5
8"
±10
3
+20 –10
4
+40 –20
5
10"
±12
4
+24 –12
5
+48 –24
6
12"
±14
4
+28 –14
5
+56 –28
6
16"
±18
4
+36 –18
5
+72 –36
6
20"
±20
4
+40 –20
5
+80 –40
6
Surface Finish Equal to Quartz Flat
Surface Finish croblox® .1-.3 Steel .3-.5
Surface Finish croblox® .3 Steel .6-.8
Surface Finish .8

Metric System: Tolerances expressed in microns (0.001 mm)
Lab. Master
FED.* GRADE 0-5
Webber AA
FED.* GRADE 1
Webber A1
FED.* GRADE 2

Webber A
FED.* GRADE 3

Length of Block (mm)
Tolerance (Length)
Flatness & Parallelism
Tolerance (Length)
Flatness & Parallelism
Tolerance (Length)
Flatness & Parallelism
Tolerance (Length)
Flatness & Parallelism
Through 25 mm
±.03
.03
±.05
.05
±.10 –.05
.10
±.20 –.10
.12
25-50 mm
±.05
.03
±.10
.05
±.20 –.10
.10
±.40 -.20
.12
50-75 mm
±.08
.03
±.13
.07
±.25 –.12
.10
±.45-.22
.12
75-100 mm
±.10
.03
±.15
.07
±.30 –.15
.10
±.60-.30
.12
125 mm
-
-
±.18
.07
±.35 –.18
.10
±.70-.35
.12
150 mm
-
-
±.20
.07
±.40 –.20
.10
±.80-.40
.12
175 mm
-
-
±.23
.07
±.45 –.22
.10
±.90-.45
.12
200 mm
-
-
±.25
.07
±.50 –.25
.10
±1.0-.50.
.12
250 mm
-
-
±.30
.10
±.60 –.30
.12
±1.2-.60
.15
300 mm
-
-
±.35
.10
±.70 –.35
.12
±1.4-.70
.15
400 mm
-
-
±.45
.10
±.90 –.45
.12
±1.8-.90
.15
500 mm
-
-
±.50
.10
±1.0 –.50
.12
±2.0-1.0
.15
Surface Finish Equal to Quartz Flat
Surface Finish croblox® .003-.008 Steel .008-.012
Surface Finish croblox® .008 Steel .015-.020
Surface Finish .020
*Starrett-Webber Standards of Accuracy are guaranteed to meet those of U.S. Federal Specifications GGG-G-15C, British Standard 4311 (1968) and 888 (1950); German Standard DIN 861 (1959)
MATERIAL COEFFICIENTS OF THERMAL EXPANSION ARE:
Chromium Carbide 4.7 x 10ˆ-6 inch/°F per inch
8.5 x 10ˆ-6 mm/°C per mm
SAE 52100 Steel 6.4 x 10ˆ-6 inch/°F per inch
11.5 x 10ˆ-6 mm/°C per mm
Ceramic 5.55 x 0ˆ-6 inch/°F per inch
10 x 10ˆ-6 mm/°C per mm
•Grades 0.5 and 1 surpass British Reference Guide
•Grades 0.5, 1, and 2 surpass German Grade 0
Reference Temperature – 68° F (20° C)
One Inch = 25.4 millimeters

Above information provided by The L.S. Starrett Co.® and The LS Starrett Co.® Webber Gage Division


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