page 13

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Precision Tool Repairs, Sales & Spare Parts

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. 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.

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