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Bore Gages

Bore gages are comparative instruments designed to check hole diameter and condition. Dorsey dial bore gages use the principle of two point gaging and three point centralization. The gaging contacts are diametrically opposed which allows the most accurate reading of a bore. The reference contact is constructed to allow range extensions and adapters to be added to change the measuring size of the gage without loss of accuracy or balance. During use, the gage is inserted on an angle for easy entry into the bore. The centralizer ensures locating on the true diameter. The gage is "rocked" and the indicator is observed to find the highest measurement to obtain a true diameter reading.  Below is a summary of the two models of dial bore gages that Dorsey Metrology currently offers: The Standard Series Bore Gage and the DBL Series Bore Gage.   

Standard Series Bore Gage


DBL Series Bore Gage

standard-bore-gage.jpg Features:

  • Comfortable & ergonomic handle is well balanced and can be removed to gain clearance to restricted areas.
  • Thermally insulated high impact resistant shield protects extension tubing.
  • Precisely machined phosphor bronze gaging head for sensitivity and durability.
  • Unique “tandem” centralizer uses matched and lapped components to ensure accurate and repeatable centralization.
  • Precision machined dial unit housing.
  • Replaceable contacts available.
  • Stainless steel extension tubing available in a wide variety of lengths.



  • Ergonomic and massive thermal isolation handle.
  • Stainless steel plunger encased in lightweight extension tubing. 
  • Dynamic centralizer ensures accurate and repeatable centralization.
  • Proven cam transfer mechanism that is accurate and linear over its entire range.
  • Robust external centralizer reed spring.
  • Accepts low profile indicator housing or dial unit housing.
Standard Series Bore Gage Head


DBL Series Bore Gage Head


A single piece gaging head encloses both gaging pin centralizer pins in one rugged, compact and durable unit.  The proven bell crank transfer is accurate and linear over its entire range. 



The independent dynamic centralizer secures two carbide balls on one easy to clean and compact unit.