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MTC Contact Point extensions, converters and adapters for dial & digital indicators
page two

 

  • Contact points for test indicators are shown on page 21.
  • More contact points are shown on previous page

     

What kind of point to use

 

Dial indicator and digital indicator contact points are fully interchangeable between manufacturers. There is only one deciding factor, and that is the thread diameter. For your average dial indicator you'll have a choice of inch 4-48 threads, or metric M2.5 threads. If the contact point can be screwed into the end of the spindle, then you can use it without any effects whatsoever on the indicator's accuracy.

Some dial indicators which are not built to AGD standards, resort to specialty threads. This applies to the tiny dial indicators made by Starrett or Mahr-Federal; possibly others.

Flat points are used when measuring round surfaces such as rods, cylinders and spheres. Rounded points are used when measuring flat surfaces. If contours need to be indicated, then a contact point with a ball tip should be used. Thin chisel points are used for grooves and slots. A special rolling wheel is used when measuring stock. You can even buy blanks which you can machine to your own specifications.

Q & A

 

Q: Do we need to calibrate the dial indicator after changing contact points?

  • Unlike test indicators, you do not need to calibrate the dial indicator. The size, length or shape of the contact point has no effect on the indicator's accuracy. You will, of course, have to reset to zero but you would do this as a matter of course anyway.

Thread size

 

The way some people bandy the terms 4-48 and M2.5 about, you'd think this was an innate sense we should have been born with.

4-48 is the thread size in inches, and M2.5 is in metric. They're different, and one won't fit into the other. Just because your indicator is graduated in inches or in millimeters doesn't automatically tell you which point to use. There are metric reading indicators which have inch threads, and vice versa.

To make sure, take out your micrometer or calipers and measure the diameter of the threaded portion of the contact point which fits your indicators. Allowing for some variations in manufacturing, the 4-48 thread will have a diameter of about .108" to .110" while the metric M2.5 thread will be about .1" (that's 2.5 mm).

Threads which are just a bit undersize will have one major advantage: if they ever break off inside the spindle, it will be easier to get the broken part out. You'll have no control over this; it's just a side note.

What are they made of?

 

Unless otherwise noted, these contact points are hardened steel, usually black anodized but some variation in color can occur from one batch to another.

Metric and inch point converter

 

Adapter

You can use the 4-48 contact points with your metric M2.5 indicators or vice versa if you use these simple converters. The male end will screw into the indicator spindle. The contact point will screw into the female end of the converter. The converter is 8 mm long and has a diameter of 5 mm.

male M2.5

female 4-48

MTC13-02

$12.00

male 4-48

female M2.5

MTC13-01

$12.00

male 4-48

female M2.0

MTC13-15

$15.00

male 4-48

female M1.7

MTC13-03

$15.00

male 4-48

female M1.4

MTC13-04

$15.00

male 8-36

female 4-48

MTC13-16

$19.00

Contact Point Extensions

 

These extensions will not alter the indicator's range. A 1" travel indicator remains a 1" travel indicator regardless of the extension. The extensions will allow you to reach further into a hole or groove, etc. Take the thread diameter into consideration when ordering these parts. To install: unscrew the contact point from your indicator, screw the extension into the indicator and then replace the point. You can combine extensions to your heart's content. Just make sure everything is snug and tight so that you'll get consistent readings. Outside diameter = 5 mm (.188")

Order No.

Extension Length

Thread type

Price

MTC09-14

1/4"

Inch 4-48

$7.95

MTC09-16

1/2"

Inch 4-48

$6.95

MTC09-18

3/4"

Inch 4-48

$6.95

EXT-1A

1"

Inch 4-48

$6.95

EXT-2A

2"

Inch 4-48

$6.95

EXT-3A

3"

Inch 4-48

$8.95

EXT-4A

4"

Inch 4-48

$8.95

MTC09-41

5"

Inch 4-48

$13.95

EXT-MF10

10 mm

Metric M2.5

$6.95

MTC09-44

15 mm

Metric M2.5

$6.95

EXT-MF20

20 mm

Metric M2.5

$6.95

EXT-MF40

40 mm

Metric M2.5

$6.95

EXT-MF50

50 mm

Metric M2.5

$6.95

EXT-MF60

60 mm

Metric M2.5

$6.95

EXT-MF80

80 mm

Metric M2.5

$8.95

EXT-MF100

100 mm

Metric M2.5

$9.95

Make Your Own Contact Point

 

IMG07591

We provide a one-inch or 1.5" long contact point made of soft, machinable steel (carbon steel/12L14 which has not been heat treated). It has a diameter of .188" and a 4-48 thread. You can machine, file or grind it to any desired shape or size. When you're done, you can harden it, if you like. If you need this with a metric thread, you'll have to get a converter.

  • 1" long (4-48 thread) machinable contact point MTC14-03 ... $19.50
  • 1.5" long (4-48 thread) machinable contact point MTC14-04 ... $19.50

Thin needle contact points "Adapt-A-Tip"

 

MTC1304a
If you need to reach into small holes or grooves you can use any one of the test indicator points which have either M1.4 or M1.7 threads, a 2 mm diameter shaft, a length of up to 5" and a small diameter carbide or ruby ball at the end. This is accomplished with an Adapt-A-Tip adapter. The adapter is about .33" long and it screws into any dial or digital indicator spindle which has a 4-48 thread. Then you screw the test indicator contact point into the adapter. It's an excellent solution for fitting into tight spots.

Adapt-A-Tip adapter (4-48 male to M1.4) MTC13-04 ... $15.00
Adapt-A-Tip adapter (4-48 male to
M1.7) MTC13-03 ... $15.00

Adapt-A-Tip shown. Test indicator point is not included and is shown as an example of this adapter's use.

Examples of M1.7 contact point include Interapid and Mitutoyo test indicator points on page 21.

Examples of M1.4 contact point include BesTest indicator points on page 218.

Pin vise contact point

 

Pinvise
 

This small pin vise gives you great flexibility when your contact point needs to fit into tight spaces or small grooves.

The pin vise screws into your indicator like any contact point (be sure you select the correct thread size) and then you're free to use any of the included contacts, or one of your own design. The vise will hold pins with diameters from .035" to .060".

The complete set includes everything shown here. Replacement pins are also available and they can be used with either 4-48 or M2.5 pin vises.

Order Number

Thread

Price USD

MTC13-05

complete set

with 5 points

4-48

$38.00

MTC13-08

individual pin vise

without points

4-48

$18.50

MTC13-09

individual pin vise

without points

M2.5

$18.50

MTC13-06

complete set

with 5 points

M2.5

$38.00

MTC13-10

replacement pin

.031" Ø flat end

$6.10

MTC13-11

replacement pin

.060" Ø flat end

$5.55

MTC13-12

replacement pin

bent

$6.35

MTC13-13

replacement pin

conical end

$6.10

MTC13-14

replacement pin

.120" Ø ball

$7.50

 

More CONTACT POINTS on the next page


The above items constitute advertisements on behalf of Amazon.com and are not to be construed as endorsements by Long Island Indicator Service. We strongly believe in buying quality tools and gages, and urge customers to check carefully before making a purchase. If the prices appear unusually low, we suggest proceeding with caution.
 

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This page's most recent revision: 8 NOVEMBER 2017
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Original photographs and content copyright 2017 by JWGrum

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