Whats this tool for?

Dave H (MI)

Well-known Member
So, we know it is a Starrett 25-141-S dial indicator. I do not know what the S means so far. Balanced read. What is different is that it has Kearney & Trecker Corporation on the face in addition to Starrett. K&T has a long and interesting history if I recall. A big deal around WWII. I am curious about the attachment. It allows the indicator to take readings on the underside of surfaces. Pretty interesting...at least if you are me, lol. Can't remember seeing a setup like this before.

cvphoto114160.jpg


Has a loop back and there is a knurled nut so you can remove the attachment.
 
(quoted from post at 18:11:03 01/15/22) So, we know it is a Starrett 25-141-S dial indicator. I do not know what the S means so far. Balanced read. What is different is that it has Kearney & Trecker Corporation on the face in addition to Starrett. K&T has a long and interesting history if I recall. A big deal around WWII. I am curious about the attachment. It allows the indicator to take readings on the underside of surfaces. Pretty interesting...at least if you are me, lol. Can't remember seeing a setup like this before.

<img src=https://www.yesterdaystractors.com/cvphotos/cvphoto114160.jpg>

Has a loop back and there is a knurled nut so you can remove the attachment.

Starrett would (and maybe still will) imprint a company's name on any standard dial face according to an old catalog, (extra cost for quantities under 25). That may be the meaning of the S, I haven't found that letter's meaning yet either.

The attachment on the indicator is a Starrett 670 Indicator Hole Attachment.

mvphoto87035.jpg
 
Excellent information, thanks! There are no markings on the thing at all. Not really any place to mark it. It came as a unit. I have the Styrofoam insert for the box and it has places for the indicator and attachment. No box though. One of those things you pick up even though you don't know what it does because the cost of the whole thing was less than you would pay for the indicator alone. This one was a good deal. Thanks again.
 
Here is mine. I used to run 2 Kearney and Trecker Milling machines in the early 70s one was a Vertical and the other a horizontal.
cvphoto114216.jpg
I don't have the hole attachment. I also had a Federal that said Van Norman on the dial, Van Norman made milling machines and specialty machines for automotive work such as crank shaft grinders large truck size brake drum lathes etc.
 
If you type that number in on the Starrett website the first one close that comes up is a 25-141J.

When you open the details on that one you will see a box that says other similar products.

Click on the arrow on that box and a large list of part numbers will display.

All of the ones with the S on the end of the part number say;

Special non-shock mechanism.
 
(quoted from post at 11:08:32 01/16/22) If you type that number in on the Starrett website the first one close that comes up is a 25-141J.

When you open the details on that one you will see a box that says other similar products.

Click on the arrow on that box and a large list of part numbers will display.

All of the ones with the S on the end of the part number say;

Special non-shock mechanism.

It appears they all actually have N/S as a suffix after the J, for the Special Non-Shock Mechanism, not just -S (no J) as the indicator in question has after the 25-141. I'm not saying it is not a number change over the years, but it is not the same numbering as the one David H pictured.
 
Might tend to indicate, though, that Starrett used S on indicators to indicate a special run of some sort. I know that J appears on indicators that say jeweled in the description. I know from my work that everything in a number assigned to a product has a meaning. In this case, the 25 is the size of the face. The 141 is going to be specific to this indicator but the number series may also refer to it being balanced read, drop style, metric or some combination of the three...or something I am forgetting, like increments.
 

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