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GAGE BLOCK TECHNICAL INFORMATION

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Basics of...Gage Block Specifications
Gage Block
Certificate and Serial Number
  • It is an absolute necessity that each gage block carries its own Serial Number for calibration purposes and, to determine the actual size to the closest millionth of an inch
  • A Certificate of Accuracy, traceable to NIST, is normally furnished with each gage block set and individual gage block (unless otherwise noted)

Deviation in Millionths of an Inch

Nominal
Size In.

New
Grade K

Old
Grade 1

New
Grade 00

Old
Grade 2

New
Grade 0

Old
Grade 3

New
GradeAS-1

Old
Grade B

New
GradeAS-2

N < 0.05

±12

±2

±4

-2

-2

±6

+8

-4

±12

+10

-6

±24

0.05 < N < 0.4

±10

±2

±3

-2

-2

±5

+8

-4

±8

+10

-6

±18

0.4 < N < 1

±12

±2

±3

-2

-2

±6

+8

-4

±12

+10

-6

±24

1 < N < 2

±16

±4

±4

-2

-4

±8

+16

-8

±16

+20

-12

±32

2 < N < 3

±20

±5

±5

-2

-5

±10

+20

-10

±20

+30

-18

±40

3 < N < 4

±24

±6

±6

-2

-6

±12

+24

-12

±24

+40

-24

±48

4 < N < 5

±32

±7

±8

-2

-7

±16

+28

-14

±32

+50

-30

±64