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Interapid test indicator
Premium Quality Swiss Indicators

pointinghandvintageimagegraphicsfairy2Beware of imitation and look-alike Interapid indicators made in China which can be bought cheaply even through reputable catalog houses like Fowler and SPI. The low price will give them away.

It would be hard to give a reason why you shouldn't buy the genuine Swiss made Interapid indicator. It has quickly become the standard against which all other indicators are compared.

Contents of this page and related topics:

New Interapid test indicators, Interapid repair service and Interapid spare parts are available from Long Island Indicator Service.

Why buy from us? You undoubtedly can get it a few dollars cheaper at Penn Tool, Enco or J&L Industrial. In fact, you can buy a made-in-China look-alike from Fowler or SPI for a fraction of the cost.

But, Why buy from us? If you buy from us you'll help support a small family business. There's tough competition out there. No one's getting rich here. And, we'll only sell you the genuine made-in-Switzerland article. As an incentive, read on:

Free crystal replacement coupon with every new purchase.

Crystals get scratched, discolor or crack for one reason or another, but here's good news: if you bought the Interapid test indicator from us, we'll give you a free crystal replacement. You will receive a coupon good for one free crystal replacement with every new purchase. That's the small print. Here's the big print:

  • It's an Interapid test indicator
  • You bought it from Long Island Indicator Service and have a coupon
  • We'll replace the crystal any time
  • For as long as you own the gage
  • At no cost except our published shipping and handling charge shown on the coupon

     

We'll provide NIST traceable calibration certificates when requested at time of purchase (small fee applies). No catalog can offer calibration certificates.

 

Horizontal Interapid test indicator made in Switzerland

 

Popular Interapid model 312B-1 shown above

 

This genuine, Swiss-made Interapid indicator is undisputedly the best test indicator of its kind. The large hand makes two complete revolutions in either direction and the small hand helps you keep track which revolution you're on. The right hand side of the dial has a thin black half-circle in case you want to use these in a set-up involving mirrors.

The 4 mm diameter mounting stem swivels and can be replaced if damaged. The two dove tails (back and top) are mounted with screws and these can also be replaced or removed if they get in the way. These dovetails, by the way, are hardened metal and won't get squashed with wear like the brass dovetails on other indicators. If you don't want 4 mm, then you can easily slip on a 3/8" adapter.

Many different contact points, including ruby, Teflon and nylon are optionally available, and easy to install. The contact point operates on a friction clutch, so you'll have to apply a bit of force to get the point to swivel, which it does, from the front of the indicator to the back.

Unless you know what you're doing, you should under no circumstances attempt to disassemble or adjust any of the screws or bearings on the indicator.

These indicators are designed to function when the contact angle is about 12 to the work surface (see details below).

Interapid 312B-3

Interapid 312B-3 test indicator made in Switzerland

These indicators come in a sturdy box, with a .080" diameter carbide point installed, a wrench for removing the contact point and a manufacturer's statement of conformance along with allowable errors (see bottom of this page). Calibration certificates are not included but can be gotten at the time of purchase for a nominal fee.

Check out the special sale items (shown in red below).


 

Graduations

Range

Dial

Point Length

Model

Order No.

2014 List Price

Your Price

0.001"(*)

0.120"

1.5"

5.5"

312B-15X

74.111965X

n/a

435.00

0.0005"

0.06"

1.5"

0.687"

312B-1

74.111370

273.00

254.75

0.0005"

0.06"

1.5"

2.750"

312B-15

74.111965

380.00

355.00

0.0005"

0.06"

1"

0.687"

312B-2

74.111371

271.00

265.00

0.001"

0.06"

1"

0.687"

312B-20

74.111374

276.00

265.00

0.0001"

0.016"

1.5"

0.687"

312B-3

74.111372

336.00

305.00

0.0001"

0.016"

1"

0.687"

312B-4

74.111373

339.00

339.00

0,01 mm

1,6 mm

37.5 mm

16.5 mm

312-1

74.111366

280.00

275.00

0,01 mm

1,6 mm

30 mm

16.5 mm

312-2

74.111367

279.00

275.00

0,002 mm

0,4 mm

37.5 mm

15.2 mm

312-3

74.111368

343.00

335.00

0,002 mm

0,4 mm

30 mm

15.2 mm

312-4

74.111369

339.00

339.00

 

NIST traceable certificate of calibration long form with data. Certificates of calibration only available at time of purchase.

 

CCLF

 

20.00

Small diameter .031" carbide contact point (.687" long). Regular price $19.50. Special price available only with the purchase of an Interapid indicator. See page 21 for more contact points.

105998

15.60

3/8" adapter (slips over the 4 mm mounting stem). Special price available only with the purchase of an Interapid indicator.

41665

20.00

8 mm adapter (slips over the 4 mm mounting stem). Special price available only with the purchase of an Interapid indicator.

41664

20.00

See page 36 for other adapters, holders and attachments.


(*) Important! See information regarding this indicator with the special 5.5" long contact point.

You may order online by selecting any linked order number on this page.

Extra long contact point

 

 

Horizontal model 312B-15 with 2.75" long contact point. See ordering chart above or, for the vertical version see the chart below. There is no metric equivalent for this long point model and it is only available with .0005" graduations.

You can request this indicator with a custom 5.5" extra long point in which case the graduations on the indicator are equal to .001" You'll have to make sure that whoever uses this indicator knows about the change. Attaching a tag to the indicator isn't a bad idea. This extra long point is not sanctioned by the manufacturer, so if you use it, all guarantees of accuracy are void. Customers who have used this special item report that the indicator works fine and that accuracy is not compromised. Be aware that we can not accept returns on this item if you decide that it doesn't meet your needs.

  • Special horizontal 5.5" model 312B-15X (74111965X) ... $435.00 order now
  • Special vertical 5.5" model 312B-15VX (74111958X) ... $435.00 order now

If you want to buy the extra long contact point only, please see page 21.

 

Vertical Interapid test indicator



Vertical,
jig-bore type test indicator with one dovetail and an integral 4 mm holding stem which swivels in one direction.

The contact point (.080" supplied) also swivels through a wide arc.

A friction clutch holds them in a steady position so it might take a bit of effort to move the point. Do not use any tools other than your fingers for this operation and be sure that the point is securely fastened before attempting to move it.

Never attempt to make adjustments to the ball bearings located on the side of the body, or you'll have a repair bill on your hands.

This superior vertical style indicator is well worth the invest-ment.



 

Graduations

Range

Dial

Point Length

Model

Catalog no.

2013 List Price

Your Price

0.001"(*)

0.120"

1.5"

5.5"

312B-15VX

74.111958X

n/a

435.00

0.0005"

0.060"

1.5"

2.75"

312B-15V

74.111958

382.00

375.00

0.0005"

0.060"

1.5"

.687"

312B-1V

74.111377

290.00

285.00

0.001"

0.060"

1"

.687"

312B-20V

74.111379

276.00

269.00

0.0005"

0.060"

1"

.687"

312B-2V

74.111378

290.00

285.00

0.0001"

0.016"

1.5"

.687"

312B-3V

74.111957

362.00

355.00

0,01 mm

1.6 mm

37.5 mm

16.5 mm

312-1V

74.111375

298.00

285.00

0,01 mm

1.6 mm

30 mm

16.5 mm

312-2V

74.111376

290.00

285.00

 

NIST traceable certificate of calibration long form with data. Certificates of calibration only available at time of purchase.

 

CCLF

20.00

Small diameter .031" carbide contact point (.687" long). Regular price $19.50. Special price available only with the purchase of an Interapid indicator. See page 21 for more contact points.

105998

15.60

3/8" adapter (slips over the 4 mm mounting stem). Special price available only with the purchase of an Interapid indicator.

41665

20.00

8 mm adapter (slips over the 4 mm mounting stem). Special price available only with the purchase of an Interapid indicator.

41664

20.00

 

(*) Important! See information regarding this indicator with the special 5.5" long contact point.

For other contact point options, such as ruby point see contact points. You may order online by selecting any linked model number.

 

Interapid indicator features

 

These indicators have a very light measuring force: just 0,12 N for .0005" models and 0,25 N for .0001" models.

The indicator is designed to measure with the contact point held at an angle of 12 to the measuring surface. (Some sources list this angle as 13 degrees. The difference is not significant.) This allows you to take measurements down a hole or in a bore.

The .080" diameter carbide contact point is easily replaceable with other diameters (from .015" to .120") and other substances (ruby, teflon or nylon). Under some circumstances, you can even install a longer point. See contact points.

The dial hand makes two revolutions in each direction. The small counter hand keeps track of the revolutions.

The dial has balanced numbering: 0-4-0 (.0001" indicators) and 0-15-0 (.0005" indicators). The right half of the dial features a thin black band which will help identify the plus or minus side when using a mirror.

The novel tapered shape tilts the dial towards the observer. Both Mitutoyo and Starrett have recently copied this design. This makes for easier reading with less likelihood of parallax errors as well as a reduction in glare from overhead lights.

If you need to slip the indicator into an opening then you may be interested to know that the width of the body at the stylus (contact point) is 10,3 mm which is broader than Bestest, Tesatast or Compac.

The holding stem is 4 mm (5/32") in diameter. The stem swivels and is attached to the body, although it can be removed and replaced. Simple instructions for this procedure are available on our Do-It-Yourself page. If you need a holding stem with a different diameter, use one of the following adapters:

  • An elegant 3/8" adapter fits over the 4 mm stem. Order no. 074108943 ... $20.00
  • For metric set-ups, use the 8 mm stem adapter. Order no. 074108942 ... $20.00

The dovetails are hardened metal, screwed onto the body. These can also be removed and replaced. See our parts list for replacement parts.

See a schematic drawing of the horizontal and vertical models.

 

Interapid repair

 

Long Island Indicator is an authorized repair service for Interapid test indicators.

Top-of-the-line Interapid test indicators are probably the most challenging of all to repair. Absolute cleanliness and the replacement of critical parts is essential to a quality repair. We've been trained by masters in the craft, and having an ample supply of fresh parts directly from the manufacturer are able to return any Interapid test indicator to A-1 condition.

Our fixed repair costs are outlined on page 30. It's our policy to replace any damaged or worn parts necessary for the full function of the indicator. This way you'll be sure to get an instrument that's as good as new and one you can rely on. And, if you request it, you'll get a short-form certificate of calibration, NIST traceable, for free; after all, when you get your indicator back you need to know that it's accurate. If you pay with a credit card, turn-around is less than a week. See page 30 for detailed information.

Is the indicator damaged beyond repair? If the body is damaged in any way (the front end is squashed, for instance) then we'd have to replace the body and you'd have to pay about $150 for the repair. Not usually worthwhile. If the whole face has come off because it was ripped off - that sounds serious, yet happens regularly - it's repairable for the normal cost quoted in the paragraph above.

Do you only need a new crystal installed? We charge $25 and that includes return shipping. Just enclose a check and we'll do a 2-day turn around. To make it easy, print out a packing list.

Sorry, we can't repair old models such as the 310B and 311B series. Parts for these indicators are no longer available. If have one of these, then you've gotten your money's worth since they were discontinued about 40 years ago. If you just bought one on e-bay, then you've been had.

 

Is Interapid any good?

 

We rate them among the very best. If you'd like to compare the good points and the not-so-good points of the Interapid indicator with other manufacturers then take a look at our indicator comparison page.

 

Free crystal replacement

 

Crystals get scratched, discolor or crack for one reason or another, but here's good news: if you bought the Interapid test indicator from us, we'll do a one-time free crystal replacement. Here's the deal:

  • It's an Interapid test indicator
  • You bought it from Long Island Indicator Service and can prove it
  • We'll replace the crystal once for whatever reason
  • At no cost except shipping and handling.

     

Important calibration information

 

Unlike other test indicators, Interapid indicators do not have serial numbers on them. Perhaps someday the manufacturer will remedy this situation but for now you'll have to assign your own unique serial number to each indicator if you intend to keep track of their calibration. It's easy to scratch a number into the painted body using a sharp tool. A permanent marker with a super fine point will also work. Do not use an electro-engraver because it creates sparks which have been known to damage the pinions on the gears.



Interapid series 312 test indicators are designed to permit a true reading when the angle between the stylus and the reference surface is 12 as shown in A and B (to the left).

In the rare cases when axial measurement is required with the stylus at 0 with respect to the reference surface as in C and D in the illustration, (for instance: small diameter bores) the readings must be multiplied by a factor of 1.022 (See further information on cosine error.)

It also follows that incremental calibration discrepancies can be corrected by adjusting the contact point angle.

 

 

Here are the specs as published by the manufacturer:

 

Model

Graduations

Deviation per revolution

Deviation Total

Repeatability

Hysteresis

Measuring force

 

74.111372
74.111373
74.111957

.0001"

.00016"

.0005"

.00005"

.0001"

0,25 N

 

74.111370
74.111371
74.111965
74.111377
74.111378
74.111958

.0005"

.0004"

.0012"

.0002"

.0002"

0,12 N

 

74.111368
74.111369
74.10002
74.10003

0.002 mm

4 m

10 m

1 m

2 m

0,25 N

 

74.111366
74.111367
74.111375
74.111376
74.10000
74.10001

0.01 mm

10 m

23 m

3 m

3 m

0,12 N

 

Source: Tesa specifications (1899.011.9706) which are included with each indicator as of August, 2005.

 

Using the correct contact point

 

While various diameter balls do not affect readings, the correct contact point length is critical. (Refer to model information on this page.) Use only points designed for Interapid indicators. Any deviation will result in reading errors.

When ordering new points, take note of the indicator's model number and decide on the ball diameter you'll need. Contact points in carbide, ruby or Teflon can be found on page 21.

 

Problems with repeatability

 

According to the manufacturer, the Interapid test indicator is allowed a repeatability error of .0002" (for .0005" models) and .00005" (for .0001" models). Refer to the specs above.

Repeatability must be checked against the measuring surface. When the contact point is resting against the measuring surface, turn the bezel so that zero is directly in line with the pointer (hand). The indicator's "at rest" zero reading must not be used to verify repeatability.

Swiveling the contact point may cause the zero setting to change slightly. If this happens, reset zero by turning the bezel.

Zero readings may also be off when comparing contact point up and contact point down motions. Reset the zero by turning the bezel as needed.

Furthermore, repeatability can only be assured if the indicator is securely fastened to a good test stand or other fixture. Fastening by the dovetail as close as possible to the front of the indicator is the preferred method.

 

Interapid older models

 

Current test indicator models begin with the number 312. Previous models were number 311 and these are often still repairable, depending on the damage. The oldest models were number 310 and you can assume these are beyond repair simply because spare parts are obsolete. If the horse-shoe shaped clip which holds the bezel in place is missing, then you may have to improvise with a piece of spring-wire bent into the correct shape. You might be tempted to say "It only needs a cleaning," but that's almost never the case. None-the-less, if you want us to have a look, it costs you nothing but shipping.

For a brief period of time Brown & Sharpe had put its name on the Interapid indicators. For example, B&S model 7025-4 was actually Interapid model 312B-1. These can still be repaired because they were not imitations but genuine Interapid indicators made in Switzerland.

 

Interapid dove tails and stem attachments

 

It would appear that one of the advantages Interapid indicators have over other brands is the replaceable dovetails. Each of the 1 or more dovetails (depending on models) is fastened to the body with several screws. Dovetails are made of hardened steel and they won't break or wear down like those which are integral with the bodies of Bestest, Mitutoyo, Compac and others. Because they're hardened, they probably will never have to be replaced. Unless... the entire dovetail has been ripped from the body through some misadventure. In this case, the screw holes are usually damaged beyond repair anyway.

The feature of replaceability is not particularly important. However, the hardened steel is. These dovetails will outlast any others.

If you'd like to buy replacement dovetails and screws check the Interapid parts list. For instructions on replacing stem attachments see our Do-it-Yourself page.

 

 

Questions and Answers about the Interapid indicator

 

Q: The contact point moves up and down (forward and backward is a better description) but one direction is noticeably harder than the other. Shouldn't they be the same?

A: Ideally—yes—and probably in a new indicator this will be the case. Interapid indicators have a spring mechanism that controls this force which is quite different from any other manufacturer's. Unfortunately it can not be modified without taking the entire indicator appart. Don't attempt this unless you already know how to put it back together! The spring can weaken in one direction over time but the problem is more likely the result of previous repairs. Just the act of taking the mechanism apart can distort the spring's shape. The difference in force shouldn't matter much but if it's imperative to your operation that they are identical, you should consider switching to a different brand. Bestest, Tesatast and Compac would be ideal substitutes.

 

Q: I know you have been asked before, but I really don't like the peeling paint on my Interapid. Isn't there something I can do?

A: Of course there is. You will have to completely disassemble the indicator until you have just the body left. Use paint stripper if it still has bits of paint on it. Then spray with a primer followed by a color of your choice. Be careful you don't get paint onto any of the screw threads or you'll have a heck of a time trying to get the screws back in.
Here's a handy hint: if you don't mind spending the money, just buy yourself a new body instead. Then your indicator will look like an original and the paint on the new bodies will last much longer.

 

Q: I have a model 310-B1. I see that parts are no longer available. The only thing wrong with the indicator is that the face comes off easily. The plastic split-ring that holds it on needs to be replaced and I was hoping that there might be another indicator that incorporates the same ring that I could purchase. Please let me know if that is the case.

A: Those are exactly the parts that are the weak link on this indicator and those rings are long gone... no one else uses anything like it. The other missing item is the little horse-shoe shaped clip. If you really love this indicator, We suggest you try to improvise a way to hold the bezel in place. A properly shaped piece of spring wire might do the trick.

 

Q: We recently purchased a new Interapid 312B-3 indicator and noticed that the dial appears to slightly lift from the base. Is this common with these indicators ?

A: The movements on the large diameter indicators are mounted on a spring washer which creates the friction to keep the dial from rotating unnecessarily. There is some wiggle as a result. You should notice it when you "pull" the bezel upwards. It should not be more than about 1 mm.

 

Q: I would like to know if the 2.75" #111913 indicator point can be used with the 312B-3 Interapid indicator? I believe that the divisions will now be 0.0005" instead of 0.0001" with this longer point.

A: The readings would be very close to .0004" per graduation but the indicator will most likely stick, jump and hang with this size point installed. The hair spring can not handle the extra weight of this long point. It is not advisable.

 

Q: Can I get the small wrenches to change the Interapid contact point properly? The tips all have the small flat machined into the shank and a new indicator used to have one of these wrenches supplied with the kit but I haven't seen one with any of the new indicators we've purchased recently. It used to be a simple round disk with a notch that fit the flat on the tip shank. Without this a needle-nose pliers works but seems wrong putting a pliers on something so delicate.

A: I'm surprised to hear that these wrenches are missing in some of your new gages. They really should have been included but they do tend to fall out. Someone may have opened the boxes at some point (even during shipping) and may not have known the significance of this little wrench. By the way, we use small pliers. They work very well. (The wrench is part number 01860307 and can be ordered on page 151.)

 

Q: I purchased a spring and gear assembly for the Interapid indicator (312B-3) and I am having a difficult time getting the indicator to return to 0 accurately (within .0001). Part of the problem is adjusting the ball bearing with spanner nuts. Will you please help me with this?

A: Interapid indicators are difficult to repair. It takes most of us several months of practice to get it right. I suggest you send it to a repair shop for servicing.

 

Q: I have a model 310-B1. I see that parts are no longer available. The only thing wrong with the indicator is that the face comes off easily. The plastic split-ring that holds it on needs to be replaced and I was hoping that there might be another indicator that incorporates the same ring that I could purchase. Please let me know if that is the case.

A: Those are exactly the parts that are the weak link on this indicator and those rings are long gone... no one else uses anything like it. The other missing item is the little horse-shoe shaped clip. If you really love this indicator, I suggest you try to improvise a way to hold the bezel in place. A properly shaped piece of spring wire might do the trick.

 

Q: I have an Interapid model 312-b3 indicator. I need to use it to center a rifle barrel (center the interior bored hole) in a lathe at a point fairly deep into the hole. I believe I could use your long indicator points for this operation as long as I'm aware that the accuracy of the dial is decreased.

A: If the contact point is exactly twice the length of the standard point, then the graduations on the .0005" indicator will equal .001" and the graduations on the .0001" indicator will equal .0002".

 

Q: I recently purchased an Interapid 312B-1V (used, no directions). In order to move the contact you state: "be sure that the point is securely fastened before attempting to move it." Would this mean to ensure point is tight in holder then run the contact against the stop? Then move to desired angle?

A: As you've probably noticed, the contact will swivel (with a bit of force applied) in two directions. Just make sure that you've completely screwed in the contact point before you swivel otherwise you might break off the point in the process.

 

Q: I have an older Interapid test indicator, model # 311B-1 and I was wondering if by any chance you would still have parts for it? The part I'm looking for is the one that holds the bezel to the extension ring. It looks like a horse shoe, or if you know of any company that makes replicas such as this.

A: We called it the horseshoe clip at the time. No one makes this part as far as I know. People have been known to improvise with a bit of copper wire which can pretty easily be bent into shape and filed down if necessary.

 

Q: I have a brand new Horizontal model 312B-15 with 2.75" long contact point. I ordered the wrong one, so I bought some shorter tips for this indicator, now it acts jerking and does not repeat with a shorter tip on it. Does this mean that I can only use the long tip?

A: The long point models have a different hair spring to compensate for the weight of the point. Apparently replacing this with a short point causes the jerkiness you've noticed. The only thing you can do is stick with the long point, or have the hair spring replaced.

 

Q: The paint is peeling from my Interapid indicator. Can I do anything?

A: This problem is seen more commonly among the older models. Certain solvents softened the paint and it eventually began to peel. We don't see the problem anymore on newer models. My suggestion is to scrape off the peeling paint. You'll end up with a shiny brass body which isn't so bad looking after all. Trying to repaint is usually an invitation to failure. For one thing, you'd have to disassemble the indicator completely and unless you really know what you're doing... please don't!

 

Q: How could I sterilize an Interapid indicator used in biological experiments?

A: Surface cleaning with isopropyl alcohol can be used, just don't immerse. There is a small amount of oil in the bearings and we have to be sure that these don't dry out. Dried oil becomes gummy and that would be detrimental. For complete sterilization, Gamma radiation may work very well. I don't see how it could damage any of the gage's components as long as no excessive heat is produced. Having never tried this, though, it is only a guess. Ethylene oxide can be used if it doesn't dry the oil. I don't know if it would. If the crystal becomes fogged by the gas, you'd have to replace it, but that would be part of the cost of sterilization. Autoclaving to 120-degrees is probably too severe a method. The presence of steam would be quite damaging. I would avoid this method unless dry heat can be used. In summary, use the alcohol whenever possible, before resorting to any of the other methods.

 

Q: The contact point moves up and down (forward and backward is a better description) but one direction is noticeably harder than the other. Shouldn't they be the same?

A: Ideally yes and probably in a new indicator this will be the case. Interapid indicators have a spring mechanism that controls this force which is quite different from any other manufacturer's. Unfortunately it can not be modified without taking the entire indicator apart. Don't attempt this unless you already know how to put it back together! The spring can weaken in one direction over time but the problem is more likely the result of previous repairs. Just the act of taking the mechanism apart can distort the spring's shape. The difference in force shouldn't matter much but if it's imperative to your operation that they are identical, you should consider switching to a different brand. Bestest, Tesatast and Compac would be ideal substitutes.

 

Q: We have an Interapid 312b-2, the hair spring is currently not wound up, when you're looking at the dial and needle as if you were using the indicator, would you spin the needle clockwise to put tension on the spring or counter clockwise to put tension on the spring? The crown gear has a bent tooth which stops the large needle from turning more then 4 revolutions in the counter clockwise direction. Can the crown gear be removed and turned so the bent tooth doesn't hinder the movement?

A: You will have to disassemble the gage in order to pre-load the hairspring. When it is apart, you will see the direction required. The crown gear can also be positioned so that the damaged tooth is not engaged.

 

Q: I have an Interapid indicator that has a little play side to side with the end. It will repeat fine as long as you don't move side to side on the part you're indicating. I was wondering if you could give me some advice on what i can do to fix the play?

A: You would want to tighten the ball bearings just enough to remove the play. If you over-tighten, your indicator will start to stick or not repeat correctly.

 

 


Interested in more Q&A about Interapid? Join us on Facebook by clicking on the Interapid indicator shown below. And, thanks!

 

 

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