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Standard Dial Bore Gage Extension Chart
for Standard Gage and Dorsey Metrology bore gages

 

Each Standard Dial Bore Gage comes supplied with a number of different extensions which need to be installed to measure different diameters. This chart will tell you which extension you should select for the desired measuring range. The extensions are the same for inch and metric bore gages and will also fit the Dorsey Standard style bore gages.

If you need to replace missing or worn extensions, they can be found on our parts lists for Standard Gage on page 72. For further information on Standard Dial Bore Gages, refer to page 95.

 

Gage Size

Extension No.

Range

Range (metric)

Bore Gage No. 0

1 (X2-85801)

.375" to .4375"

9.5 to 11.1 mm

2 (X2-85802)

.4375" to .5"

11.1 to 12.7 mm

3 (X2-85803)

.5" to .5625"

12.7 to 14.3 mm

4 (X2-85804)

.5625" to .625"

14.3 to 15.9 mm

Bore Gage No. 1

1 (X2-85816)

.625" to .75"

15.9 to 19 mm

2 (X2-85817)

.75" to .875"

19 to 22.2 mm

3 (X2-85818)

.875" to 1"

22.2 to 25.4 mm

Bore Gage No. 2

0 (X2-85820)

1" to 1.0625"

25.4 to 27 mm

1 (X2-85821)

1.0625" to 1.125"

27 to 28.5 mm

2 (X2-85831)

1.125" to 1.1875"

28.5 to 30 mm

3 (X2-85823)

1.1875" to 1.25"

30 to 32 mm

4 (X2-85824)

1.25" to 1.3125"

32 to 33.5 mm

5 (X2-85825)

1.3125" to 1.375"

33.5 to 35 mm

6 (X2-85826)

1.375" to 1.4375"

35 to 36.5 mm

7 (X2-85827)

1.4375" to 1.5"

36.5 to 38 mm

8 (X2-85828)

1.5" to 1.5625"

38 to 39.5 mm

Bore Gage No. 3

1 (X2-85831)

1.5" to 1.625"

38 to 41 mm

2 (X2-85832)

1.625" to 1.75"

41 to 44.5 mm

3 (X2-85833)

1.75" to 1.875"

44.5 to 47.5 mm

4 (X2-85834)

1.875" to 2"

47.5 to 51 mm

5 (X2-85835)

2" to 2.1562"

51 to 55 mm

Bore Gage No. 4

1 (X2-85841)

2.125" to 2.375"

54 to 60 mm

2 (X2-85842)

2.375" to 2.625"

60 to 67 mm

3 (X2-85843)

2.625" to 2.875"

67 to 73 mm

4 (X2-85844)

2.875" to 3.125"

73 to 79 mm

Bore Gage No. 5

1 (X2-85851)

3.0937" to 3.5"

78 to 89 mm

2 (X2-85852)

3.5" to 3.9375"

89 to 100 mm

3 (X2-85853)

3.9375" to 4.375"

100 to 111 mm

4 (X2-85854)

4.375" to 4.8125"

111 to 122 mm

5 (X2-85855)

4.8125" to 5.25"

122 to 133 mm

6 (X2-85856)

5.25" to 5.6875"

133 to 144 mm

7 (X2-85857)

5.6875" to 6.125"

144 to 156 mm

Bore Gage No. 6

1 (X2-85861)

6" to 7"

153 to 178 mm

2 (X2-85862)

7" to 8"

178 to 203 mm

3 (X2-85863)

8" to 9"

203 to 229 mm

4 (X2-85864)

9" to 10" *

229 to 254 mm

5 (X2-85865)

10" to 11" *

254 to 279 mm

6 (X2-85866)

11" to 12.125" *

279 to 309 mm

* Note: Bore gage No.6 requires plunger extensions when measuring above 9". Remove the gaging plunger contact point, using two wrenches provided, and screw it firmly into Extension B, also provided. Then screw Extension B into the gaging plunger, again using the two wrenches, being careful not to destroy the threads in the process. See further instructions below.

Special instructions for Bore Gage No.6

StandardSize6Extensions

Range extensions (RE), centralizing plunger extensions (CPE) and gaging plunger extensions (GPE) are required when setting the gage to any size over 12 inches.

The complete extension set for sizes larger than 12" consists of the following pieces and can be ordered individually or as a set (B0-85966) on page 156.

  • 1 piece X2-86457 (GPE) = .625" long
  • 1 piece X2-86458 (RE) = .750" long
  • 2 piece X2-86260 (CPE) = .975" long
  • 3 pieces X2-85868 (RE) = 4" long

These extensions are used in the following ways:

6" to 9" range:

  • use the standard range extensions as supplied in the box and as shown in the chart above.

9" to 12" range:

  • use the standard range extensions supplied in the box plus
  • two centralizing plunger extensions (X2-86259) and
  • one gaging plunger extension (X2-86458).

12" to 16" range:

  • use the standard range extensions supplied in the box plus
  • one 4" range extension (X2-85868) plus
  • two centralizing plunger extensions (C2-86260) plus
  • one gaging plunger extension (X2-86458)

15.5" to 19.8" range:

  • use the standard range extensions supplied in the box plus
  • two 4" range extension (X2-85868) plus
  • two centralizing plunger extensions (C2-86260) plus
  • one gaging plunger extension (X2-86458)

19.8" to 20.6" range

  • use the standard range extensions supplied in the box plus
  • two 4" range extension (X2-85868) plus
  • two centralizing plunger extensions (C2-86260) plus
  • two gaging plunger extension (X2-86458)

19.5" to 23.8" range:

  • use the standard range extensions supplied in the box plus
  • three 4" range extensions (X2-85868) plus
  • two centralizing plunger extensions (X2-86260) plus
  • one gaging plunger extension (X2-86457)

23.8" to 24.5" range:

  • use the standard range extensions supplied in the box plus
  • three 4" range extensions (X2-85868) plus
  • one .75" range extension (X2-86458) plus
  • two centralizing plunger extensions (X2-86260) plus
  • one gaging plunger extension (X2-86457)

     

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Books by René Urs Meyer

The Companion Reference Book on Dial and Test Indicators
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This page's most recent revision: 23 APRIL 2016
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Original photographs and content copyright 2016 by JWGrum

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