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Long Island Indicator Service


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Mitutoyo Dial Bore Gage for through holes

Series 511

hese extremely popular Mitutoyo dial bore gages have gaging heads with interchangeable anvils and carbide-tipped contacts. Each bore gage comes supplied with a .0001" dial indicator and all the anvils required for the range of the tool. Spacers are included for small adjustments to the range. Roller guides on larger models keep the measuring head centered in the bore. The measuring contact is carbide.

Accuracy is .00008" and indication stability (which probably means repeatability - it's a new term for us) is .00004"

Optional extension rods can be attached for reaching into deep bores (see below for ordering information).

Mitutoyo bore gages are considerably less expensive than other imported dial bore gages and, most significantly, they're usually in stock. (You can find Chinese bore gages that cost even less but you should be forewarned that replacement parts will never be available for those gages.)

Important: the models shown on this page are not suitable for blind hole measurement. If you need to measure blind holes as opposed to through holes, please refer to page 56.

Check our brand comparison page for alternatives. Professional repair service is always available from Long Island Indicator Service (see page 30).


Mitutoyo 511-932 is a complete bore gage set with a measuring range from .7" to 6"


Close-up of dial indicator in plastic housing. The mounting clamp and screw attaches the indicator to the interchangeable bore measuring heads.

Mitutoyo No. Measuring range Probe depth Indicator Accuracy Price US$
511-213 .240" to .400" 2" .0005" .0002" inquire about price and stock
511-207 .400" to .740" 4" .0005" .0002" check price and stock
511-751 .7" to 1.4" 4" .0001" .00008" check price and stock
511-752 1.4" to 2.5" 6" .0001" .00008" check price and stock
511-753 2" to 6" 6" .0001" .00008" check price and stock
511-932 (full set) .7" to 6.0" up to 6" .0001" .00008" check price and stock
Mitutoyo dial bore gage extensions

Optional extensions: unscrew the measuring head from the bore gage body and insert the extension between the two pieces. As a result, the measuring depth is now the original depth plus the extension. For example, 511-753 has a measuring depth of 6". If you add the 10" extension (9.84" to be exact) you will then have a usable measuring depth of close to 16 inches. The following chart is for reference only.


Caution if buying from Amazon: their product images sometimes do not match the product description. Read carefully!

Companion Reference Guide for Test Indicators
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