page 124

Long Island Indicator Service Inc

Swiss Precision Tool Repairs, Sales & Spare Parts







Standard Gage / Dorsey Dial Bore Gage
replacement bore gage dial indicator

Standard Gage dial bore gages manufactured in Switzerland by Tesa are discontinued as of February 2015. Dorsey (USA) makes an excellent look-alike with the same specifications.

The same indicator is used for Size 2, 3, 4, and 5 dial bore gages. A slightly larger version is used for bore gage size 6. A simple hex screw will fasten it to your various measuring heads. If you don't use more than one head at a time, you can save some money by using only one indicator for all your measuring heads. You might also want to buy a new indicator simply to replace an old or defective indicator. Perhaps you want to replace the obsolete "made in Poughkeepsie" indicator, or the equally obsolete "made in Switzerland" indicator with the new model made by Dorsey Metrology, USA. You can also convert your metric bore gage to inch and vice-versa.

Digital versions are also available with the option of converting your dial bore gage into a digital electronic gage.


Standard Bore Gage indicator model D1-20241-B-1 made in Europe is now obsolete. Replace with the Dorsey indicator which will fit perfectly. (see below)


Your dial bore gage indicator consists of everything shown in the accompanying photo. Simply unscrew the hex nut, insert your measuring head, and hand tighten. Don't use tools other than a hex wrench to tighten the screw because you'll invariably over tighten and ruin the thread, in which case you'll end up having to buy another indicator.

Also available: spare parts for the bore gage indicator including crystals and other easily replaced parts are available while supply lasts.


Standard no. (order no.)

Indicator no.


X8-81141B (.0001")


Size 0


X8-85241B (.0001")


Size 2, 3, 4, 5


X8-86241B (.0001")


Size 6



New! Dorsey replacement indicator - a Great Idea!


You have an opportunity to replace the Swiss-German Standard Gage indicator, or the old Poughkeepsie indicator with the American-made
Dorsey indicator shown at left. Just like the European version in the photo above, it comes complete in a housing.

The bright yellow dial (on metric indicators) and white dials on inch versions feature a revolution counter to help you keep track of any possible over-travel. A popular 1-revolution version is also offered and we recommend it for better accuracy and easier reading.

You'll find that it's of comparable quality, is completely interchangeable, offers more options, costs less and is made in our own back-yard. Go for it.

Older model bore gage No.6 had a 1-inch diameter stem. It will be necessary to buy the appropriate indicator shown in the listing below. All other models and current No.6 models have 5/8" inside diameter housings.


Standard no. (Ø)

Graduations / range

Order no.



No. 2, 3, 4, 5, 6 (5/8")

.0001" / .050" (3 rev)




No. 2, 3, 4, 5, 6 (5/8")

.0001" / .009" (1 rev)




No. 2, 3, 4, 5, 6 (5/8")

.0005" / .100" (3 rev)




No. 6 (1-inch Ø)

.0001" / .009" (1 rev)






Accuracy in bore gages is determined on the basis of the indicator's performance. For gage sizes 0 and 1, the accuracy is ± 1/2 graduation over the entire range. For gage sizes 2 through 6, the accuracy is ± one graduation. In all cases, repeatability is 1/5 graduation.

You will find more information on bore gages, including calibration, by perusing the index page.



from our reference shelf:

BesTest and TesaTast Indicator Repair Manual … page 177
Starrett 711 Last Word Indicator Repair Manual … page 199
Interapid Indicator Repair Manual … page 208
Compac Test Indicator Repair Manual ... page 194

Long Island Indicator Service Inc
14 Sarah Drive — Hauppauge NY 11788 — USA

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This page's most recent revision: 16 MARCH 2017
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