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Standard Style No 6 Bore Gage

Standard Bore Gages

Compact, light-weight construction

Dial bore gages are used to quickly inspect hole diameter as well as to detect and measure all kinds of bore conditions such as taper, bell-mouth and out-of roundness. They in no way depend upon a sense of "feel" as is the case with non-indicating types. Machine operators find them to be particularly useful in making quick, accurate adjustments to bring work-pieces within tolerance. In this application, the reading on the dial tells the exact amount of tool correction needed and eliminates uncertain, "creep-up" methods of making adjustments.

The reliable accuracy for which these bore gages are known is due to a delicately responsive gaging plunger and a positive centralizing mechanism that correctly positions the gage in the bore. After setting to a master, diametral measurements are obtained y rocking the gage in the bore and noting the greatest deflection of the dial hand.

The regular type dial bore gage is intended for the usual situation where there is ample space in front of the bore opening. For gaging in restricted spaces, or to facilitate reading where other limitations are imposed, additional bore gage styles are available. If your application require additional range extension, please see the length extensions or extra length extension pages.

Centralizing Mechanism

The centralizing mechanism shown here is standard equipment on sizes 2 through 6. Correct and positive positioning of the gage in the bore is accomplished by two radially expanding plungers which act in unison. These assure automatic alignment so that measurements are made through the center of the bore at all times - even if the gage is inserted at an angle.

Centralizing Mechanizm

Gaging Head

Bore Gage Head
features

Gaging Head Features

Time proven design made better by Dorsey.


  • Bell crank transfer
  • Replaceable contacts
  • Steel, carbide or diamond contacts
  • Accurate and linear transfer
  • Made from cast phosphor bronze

Gaging Head Dimensions

The table below displays available gaging head dimensions common to all standard bore gage styles. See the legend below for dimension letters definitions.

Gage Head Dimensions
SizeDEFGHJKRange Extension Adapter Part #
MinMaxMinMax
21.00"1.53"1.19"1.69"1.75".195".140".025".050"DS-B0-85929
31.5"2.16"1.69"2.56"3.13".224".156".025".050"DS-B0-85934
42.12"3.13"2.56"3.56"4.00".224".032".025".075"DS-B0-85942
53.09"6.13"3.50"6.44"8.00".224".032".025".075"DS-B0-85952
66.00"12.13"6.44"12.63"24.00".312".032".030".100"DS-B0-85966
D
Standard gaging range
E
Gaging range with optional offset contacts
F
Maximum gaging range with extension adapters
G
Standard center line
H
Offset center line modification, add -H to part #
J
Standard gaging plunger travel
K
Optional extended plunger travel, add -K to part #

Standard Bore Gages Models

Please use the table below to select the bore gage you need to order or need a quote. All standard bore gage are shipped in disposable shipping containers. Fitted wooden storage boxes are available.

Standard Bore Gages Product Matrix
Gage SizeIndicator GraduationHigh Amp IndicatorPart #Traditional IndicatorTraditional Part #
1.00 - 1.53"
2
25.4 - 38.9mm
.00005"sDS-2I4-005DS-B1-10102  
.0001"sDS-2I9-01DS-B1-11102  
.0001"DS-2I50-01DS-B1-12102DS-2DM025-01DS-B2-12102
.00025"DS-2I1000-025DS-B1-10112  
.0005"sDS-2I40-05DS-B1-13102  
.0005"DS-2I100-05DS-B1-14102DS-2DM050-05DS-B2-14102
NONELESS INDICATING UNITDS-B1-15102  
0.010mmsDS-2I10-01mmDS-B1-16102DS-2DM5-01mmDS-B2-16102
0.005mmDS-2I25-005mmDS-B1-17102DS-2DM012-005mmDS-B2-17102
0.002mmDS-2I02-002mmDS-B1-18102DS-2DM005-002mmDS-B2-18102
0.002mmsDS-2I10-002mmDS-B1-19102  
0.001mmsDS-2I01-001mmDS-B1-10122  
.0001" / 0.002mmsS2I.MDS-B1-10142  
.00005" / 0.001mmDIGITALDS-B5-10102  
1.50 - 2.16"
3
38.1 - 54.8mm
.00005"sDS-2I4-005DS-B1-10103  
.0001"sDS-2I9-01DS-B1-11103  
.0001"DS-2I50-01DS-B1-12103DS-2DM025-01DS-B2-12103
.00025"DS-2I1000-025DS-B1-10113  
.0005"sDS-2I40-05DS-B1-13103  
.0005"DS-2I100-05DS-B1-14103DS-2DM125-05DS-B2-16103
NONE DS-B1-15103  
0.010mmsDS-2I10-01mmDS-B1-16103DS-2DM5-01mmDS-B2-16103
0.005mmDS-2I25-005mmDS-B1-17103DS-2DM012-005mmDS-B2-17103
0.002mmDS-2I02-002mmDS-B1-18103DS-2DM005-002mmDS-B2-18103
0.002mmsDS-2I10-002mmDS-B1-19103  
0.001mmsDS-2I01-001mmDS-B1-10123  
.0001" / 0.002mmsS2I.MDS-B1-10143  
.00005" / 0.001mmDIGITALDS-B5-10103  
2.12 - 3.13"
4
54.0 - 79.5mm
.00005"sDS-2I4-005DS-B1-10104  
.0001"sDS-2I9-01DS-B1-11104  
.0001"DS-2I50-01DS-B1-12104DS-2DM023-01DS-B2-12104
.00025"DS-2I1000-025DS-B1-10114  
.0005"sDS-2I40-05DS-B1-13104  
.0005"DS-2I100-05DS-B1-14104DS-2DM125-05DS-B2-14104
NONE DS-B1-15104  
0.010mmsDS-2I10-01mmDS-B1-16104DS-2DM-01mmDS-B2-16104
0.005mmDS-2I25-005mmDS-B1-17104DS-2DM012-005mmDS-B2-17104
0.002mmDS-2I02-002mmDS-B1-18104DS-2DM005-002mmDS-B2-18104
0.002mmsDS-2I10-002mmDS-B1-19104  
0.001mmsDS-2I01-001mmDS-B1-10124  
.0001" / 0.002mmsS2I.MDS-B1-10144  
.00005" / 0.001mmDIGITALDS-B5-10104  
3.09 - 6.13"
5
78.5 - 156mm
.00005"sDS-2I4-005DS-B1-10105  
.0001"sDS-2I9-01DS-B1-11105  
.0001"DS-2I50-01DS-B1-12105DS-2DM025-01DS-B2-12105
.00025"DS-2I1000-025DS-B1-10115  
.0005"sDS-2I40-05DS-B1-13105  
.0005"DS-2I100-05DS-B1-14105DS-2DM125-05DS-B2-14105
NONE DS-B1-15105  
0.010mmsDS-2I10-01mmDS-B1-16105DS-2DM-01mmDS-B2-16105
0.005mmDS-2I25-005mmDS-B1-17105DS-2DM012-005mmDS-B2-17105
0.002mmDS-2I02-002mmDS-B1-18105DS-2DM0005-002mmDS-B2-18105
0.002mmsDS-2I10-002mmDS-B1-19105  
0.001mmsDS-2I01-001mmDS-B1-10125  
.0001" / 0.002mmsS2I.MDS-B1-10145  
.00005" / 0.001mmDIGITALDS-B5-10105  
6.00 - 12.13"
6
152.5 - 308mm
.00005"sDS-2I4-005DS-B1-10106  
.0001"sDS-2I9-01DS-B1-11106  
.0001"DS-2I50-01DS-B1-12106DS-2DM025-01DS-B2-12106
.00025"DS-2I1000-025DS-B1-10116  
.0005"sDS-2I40-05DS-B1-13106  
.0005"DS-2I100-05DS-B1-14106DS-2DM125-05DS-B2-14106
NONE DS-B1-15106  
0.010mmsDS-2I10-01mmDS-B1-16106DS-2DM-01mmDS-B2-16106
0.005mmDS-2I25-005mmDS-B1-17106DS-2DM012-005mmDS-B2-17106
0.002mmDS-2I02-002mmDS-B1-18106DS-2DM0005-002mmDS-B2-18106
0.002mmsDS-2I10-002mmDS-B1-19106  
0.001mmsDS-2I01-001mmDS-B1-10126  
.0001" / 0.002mmsS2I.MDS-B1-10146  
.00005" / 0.001mmDIGITALDS-B5-10106 T

s - single revolution indicator.