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MTC Contact Points for dial & digital indicators
page one

 

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

Ruby, Teflon and Nylon

 

These contact points are used for special applications, typically in optics.

The ruby point does not expand or contract with heat and cold. It is also less likely to scratch delicate surfaces. It's also the material that will hold up to silicon carbide surfaces and it will not conduct electricity making it suitable for CNC operations.

The Teflon point is softest and made of a solid Teflon ball. It is least likely to scratch—and ideal for mirror finishes—but is not as long lasting as the others.

The specific Nylon we use for the contact points is Nylon 6/6 and it is not glass filled. The glass filled (fiber glass basically) will give Nylon a better holding shape, but it’s abrasive and defeats the purpose of using the Nylon ball.

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.

Round ball contact: cupped style in carbide, ruby, Nylon or Teflon

 

The most common, and probably most useful contact point has a large 3 mm diameter carbide ball (.06" radius) set into the cupped end of the point. Only a portion of the ball will be visible. The ball does not rotate and is not designed to rotate. This type of contact point should be used when flat surface measurements are taken.

Carbide will provide a long useful life for these points particularly if any sliding motion is involved. Sliding the test piece under the contact point will inevitably wear down the point. For special applications, this ball can be made of synthetic ruby, Teflon or Nylon. The length (L) of the point can be altered by using a separate length extension.


Ball diameter is 3 mm
Outside diameter is 5 mm

Order no.

Ball material

Ball Ø

Thread Ø

Length

Price USD

MTC10-02

Carbide

3 mm

4-48

.25"

19.50

MTC10-11

Carbide

3 mm

4-48

1"

19.50

MTC10-03

Ruby

3 mm

4-48

.25"

29.50

MTC10-12

Ruby

3 mm

4-48

1"

29.50

MTC10-04

Teflon

3 mm

4-48

.25"

29.50

MTC10-13

Teflon

3 mm

4-48

1"

29.50

MTC10-05

Nylon

3 mm

4-48

.25"

19.50

MTC10-14

Nylon

3 mm

4-48

1"

19.50

MTC10-07

Carbide

3 mm

M2.5

.25"

19.50

MTC10-08

Ruby

3 mm

M2.5

.25"

29.50

MTC10-09

Teflon

3 mm

M2.5

.25"

29.50

MTC10-10

Nylon

3 mm

M2.5

.25"

19.50

Mitutoyo style dial indicator points with 3 mm diameter ball

M120045

With the exception of MTC44-14, these Mitutoyo style indicator points have recessed .120" (8 mm) diameter balls made of carbide, steel, ceramic or ruby. They will fit any brand indicator with the correct thread diameter.
 

Order No.

Mitutoyo No.

Material

Ø x L

Thread Ø

Price USD

MTC44-09

120045

Carbide

3 mm x 8.0 mm

M2.5

19.50

MTC44-16

n/a

Ceramic

3 mm x 8.0 mm

M2.5

29.50

MTC44-14

900032

Hardened steel

.160" x .25"

4-48

9.50

MTC44-10

120047

Ruby

3 mm x 8.0 mm

M2.5

29.50

Ball exposed style


Different ball diameters are available for this style.

Rather than being incorporated into the contact point, these balls are brazed onto the ends. They're suitable for tracing contours or reaching into grooves, slots, recesses and holes.

Order no.

Carbide Diameter

Length

Thread

Price

MTC10-235

.031"

1/2"

4-48

$19.95

MTC10-236

.062"

1/2"

4-48

$19.95

MTC10-238

.120"

1/2"

4-48

$19.95

MTC10-257R

2.5 mm (Ruby)

1"

4-48

$38.00

MTC10-239

0.8 mm

1/2"

M2.5

$19.95

MTC10-240

1 mm

1/2"

M2.5

$19.95

MTC10-301

1.5 mm

1/2"

M2.5

$19.95

MTC10-241

2 mm

1/2"

M2.5

$19.95

MTC10-241R

2 mm (Ruby)

1/2"

M2.5

$38.00

MTC10-300

2.5 mm

1/2"

M2.5

$19.95

MTC10-242

3 mm

1/2"

M2.5

$19.95

MTC10-258

3 mm

1"

M2.5

$19.95

MTC10-350

3.5 mm

1/2"

M2.5

$24.50

MTC10-400

4 mm

1/2"

M2.5

$24.50

MTC10-450

4.5 mm

1/2"

M2.5

$24.50

MTC10-500

5 mm

1/2"

M2.5

$29.95

MTC10-550

5.5 mm

1/2"

M2.5

$29.95

MTC10-600

6 mm

1/2"

M2.5

$29.95

Flat Carbide / Flat Nylon


The diameter (ØA) is .185"

These American-made flat contact points have a carbide face on them. They are about the same diameter as most indicator spindles: .185" (7 mm). You'll be able to get them in a variety of lengths (inquire about lengths not shown below). If you need longer lengths, get an extension. These carbide points will fit all mechanical and digital dial indicators with inch (4-48) or metric (M2.5) threads.

We also offer a similar contact point with a nylon surface instead of the carbide. This is also available with a custom 4-40 thread.

Order no.

Diameter

Length

Thread

Price

MTC08-48

.185" carbide

1/4"

Inch 4-48

$19.95

MTC08-48N

.185" nylon

1/4"

Inch 4-48

$19.95

MTC08-48NC

.185" nylon

1/4"

Inch 4-40 custom

$29.95

MTC08-49

.185" carbide

3/8"

Inch 4-48

$19.95

MTC08-51

.185" carbide

3/4"

Inch 4-48

$19.95

MTC08-53

4.7 mm carbide

5 mm

Metric M2.5

$19.95

MTC08-54

4.7 mm carbide

10 mm

Metric M2.5

$19.95

MTC08-55

4.7 mm carbide

15 mm

Metric M2.5

$19.95

Common Radius Points—20% off

 

MTC0705
Radius points are the most common and can be the cheapest of the indicator contact points. The diameter (ØA) is .188" and the radius is 4 mm. There are two styles: they're made of blackened, hardened steel or they have a carbide end, both with a light radius. Although they are available in many different lengths, we think it's best to buy the standard 1/4" length, and then combine it with an appropriate extension. If you'd rather have specific lengths, please inquire.

A discount of 20% applies to quantities of 3 or more of one type when ordered online (for the following Common Radius Points only).

Order Number

Type

Length

Thread

Price

MTC07-05

steel

1/4"

4-48

6.00

MTC07-05-25

steel

1/4"

4-48

40.00 (25 pieces)

MTC07-07

steel

3/8"

4-48

6.00

MTC07-27

steel

3 inches

4-48

8.50

MTC07-33

steel

10 mm

M2.5

6.00

MTC07-49

carbide

1/4"

4-48

19.50

MTC07-56

carbide

10 mm

M2.5

19.50

MTC07-58

carbide

25 mm

M2.5

19.50

Flat Point, Carbide Tip recessed

 

mtc4713

 

 

These flat contact points have a recessed smaller diameter carbide disc brazed onto the surface. Refer to the dimensions shown on the drawing. Designed for Mitutoyo dial indicators and digimatic indicators, but can be used on any indicator having the same thread size.

Order Number

Mitutoyo

Thread

D / d / L

Price

MTC47-09

131259

4-48

.2" / .17" / .2"

21.00

MTC47-10

131260

4-48

.27" / .25" / .4"

32.00

MTC47-11

131261

4-48

.41" / .37" / .4"

39.00

MTC47-12

120041

M2.5

5.2 / 4.3 / 5 mm

21.00

MTC47-13

120042

M2.5

7 / 6.5 / 10 mm

32.00

MTC47-14

120043

M2.5

10 / 9.5 / 10 mm

39.00

Roller Point

 

MTC1225
The surface to be tested runs conveniently underneath this rolling contact point. The roller allows for continuous readings to be taken. Used with flat metals, foils, sheets of fabric, etc. A lock nut (included) keeps the roller aligned.

Available in non damaging Teflon®, hardened steel or stainless steel. The wheel can have a radius or it can be flat. You will probably want to use the radius wheel on a flat surface and the flat wheel (without radius) when measuring something like wire or edges.

The stainless roller without radius (shown to the left) is not as hard as hardened steel (your other option) and will wear faster under abrasive circumstances, but it will not corrode if used under wet or damp conditions.

Stainless steel rollers will be a natural steel color whereas hardened steel will have some black anodizing on the wheel.

 

The schematic illustration shows the wheel with a radius. The dimensions are approximate but valid for all roller points.

If you can't find the correct thread size here, consider using a converter. Rolling contact points are frequently used with Mitutoyo or Teclock indicators but will fit any indicator having the correct thread size.

Thread size M2 is commonly used on CMM machines.

 


 

hardened steel

without radius

4-48

MTC12-17

$39.95

hardened steel

with radius

4-48

MTC12-18

$39.95

Teflon®

with radius

4-48

MTC12-22

$39.95

stainless steel

without radius

4-48

MTC12-25

$39.95

stainless steel

with radius

4-48

MTC12-26

$39.95

hardened steel

without radius

M2.5

MTC12-19

$39.95

hardened steel

with radius

M2.5

MTC12-20

$39.95

stainless steel

without radius

M2.5

MTC12-27

$39.95

stainless steel

with radius

M2.5

MTC12-28

$39.95

Teflon®

with radius

M2.5

MTC12-24

$39.95

stainless steel

with radius

M2 (CMM)

MTC12-30

$39.95

Carbide tipped needle point

 

Although designed for Mitutoyo dial indicators, these carbide needle point contacts will fit any other brand of indicator having 4-48 or M2.5 threads.

Keep in mind that carbide is brittle and the longer the point, the more fragile it will be.

Diameter

Length

Thread

Mitutoyo No.

Order No.

Price

.018"

.12"

4-48

131281

MTC46-04

28.00

.040"

.12"

4-48

131280

MTC46-05

20.00

.040"

.5"

4-48

---

MTC12-05

19.50

.040"

1.0"

4-48

---

MTC12-13

25.00

.060"

.5"

4-48

131279

MTC46-06

19.50

.060"

.75"

4-48

---

MTC12-11

19.50

.060"

1.0"

4-48

---

MTC12-15

23.00

.078"

.04"

4-48

131271

MTC46-07

19.50

0.45 mm

2.5 mm

M2.5

120066

MTC46-08

24.00

1.0 mm

2.5 mm

M2.5

120065

MTC46-09

19.95

1.5 mm

13 mm

M2.5

120064

MTC46-10

19.50

1.0 mm

25 mm

M2.5

MTC46-52

29.50

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. Test indicator contact points are available on page 21

Button Point contact points

 

MTC1103
These button points have large convex discs (hardened, black oxide), useful for special applications of your dial indicators.

3/8" diameter (4-48 thread) ... MTC11-02E ... $9.95
3/8" diameter (M2.5 thread) ...
MTC11-02M ... $12.95
1/2" diameter (4-48 thread) ... MTC11-03E ... $9.95
1/2" diameter (M2.5 thread) ...
MTC11-03M ... $12.95

Conical contact points

 

MTC4811

These conical steel points will fit any dial indicator or digital indicator. You will need to know the thread size or use a converter. Your price is $12.95 each.

Order Number

Conical °

Thread

Length (L)

Mitutoyo Number

MTC48-09

60°

4-48

1/2"

101190

MTC48-10

60°

M2.5

10 mm

101120

MTC48-11

90°

4-48

9/32"

101191

MTC48-12

90°

M2.5

5 mm

101385

Federal Group 0 Points

 

These contact points fit not only the Federal miniature indicators (model numbers beginning with the letter A, such as model A3Q) but any indicator having 0-80 or 10BA thread sizes (such as Brown & Sharpe MW71). These are not original Federal points and may vary insignificantly in appearance and dimensions.

Black oxide. Made in USA. $12.50 each.

Order Number

Style

Thread

Length (L)

Federal Number

MTC16-09

flat

0-80

1/4" (Ø.125")

AL-61

MTC16-01

radius

0-80

1/8"

PT-43

MTC16-05

radius

0-80

5/8"

MTC16-10

taper

0-80

.4375"

PT-119

MTC16-11

button

0-80

Ø.375"

PT-118

Bent Point

 

 

This .060" diameter hardened steel stem is bent as shown. A lock nut is provided which keeps the point properly oriented.

To get correct readings, be sure that the spindle is moving perpendicularly to the measured surface. In other words, don't set your indicator spindle at an angle.

These are only available with 4-48 threads. If you want to use it on a metric indicator, you may need to get a converter.

4-48 bent contact point MTC15-10 ... $12.00

Flat Button AGD contact point

 

IMG1797
These are genuine MTC flat black oxide steel button contact points which can be used on any brand indicator, mechanical or digital, providing you have chosen the correct thread size.

A flat contact is normally used to measure round shapes such as spheres or rods. If it is used for flat surfaces, you will have to make sure it's parallel. The upper surface of the contact point can be used to measure overhangs, undercuts or grooves. Under other circumstances, this type of contact point can be used to measure thickness of foam, soft plastics, fabric or leather where standard contact points would tend to create impressions and result in false readings.

The disc thickness is .095" (~ 2,4 mm).

 

Order Number

Diameter

Thread

Price

MTC11-07

1/4"

black oxide steel

4-48

14.50

MTC11-08

3/8"

black oxide steel

4-48

14.50

MTC11-09

1/2"

black oxide steel

4-48

14.50

MTC11-10

5/8"

black oxide steel

4-48

15.50

MTC11-11

3/4"

black oxide steel

4-48

16.50

MTC11-12

1"

black oxide steel

4-48

17.50

MTC11-13

1.5"

black oxide steel

4-48

21.50

Mitutoyo flat point - disc shaped

 

MTC1
These durable flat,
disc shaped steel contact points can be used on any brand indicator, mechanical or digital, providing you have chosen the correct thread size.

A flat contact is normally used to measure round shapes such as spheres or rods. If it is used for flat surfaces, you will have to make sure it's parallel.

Under other circumstances, this type of contact point can be used to measure thickness of foam, soft plastics, fabric or leather where standard contact points would tend to create impressions and result in false readings.

Order Number

Mitutoyo

Diameter : Length

Thread

Price

MTC48-01

101188

1/2" : 3/8"

4-48

14.50

MTC48-02

101189

3/8" : 3/8"

4-48

14.50

MTC48-03

101117

10 mm : 10 mm

M2.5

14.50

Mitutoyo spherical point, carbide tipped

 

MTC4503a
The
carbide tips on these contact points are of a slightly smaller diameter (d) than the rest of the point (D). This feature makes these Mitutoyo style points different from other points, but they can be used on any dial or digimatic indicator with the proper thread size. Length (L) refers to the overall usable length.

Order Number

Mitutoyo

D

d

Thread

Length

Price

MTC45-23

131274

.27"

.25"

4-48

.4"

21.50

MTC45-25

120058

5.2 mm

4.3 mm

M2.5

5 mm

21.00

MTC45-27

120060

10.5 mm

9.5 mm

M2.5

5 mm

32.00

Exposed Carbide Ball - Fractional Size

 

CP412a1
Carbide balls Grade 25 AFBMA with tolerance of ±.0001" and sphericity of .000025" are mounted on short shafts whose length is B and diameter is C in the chart below. American made.

Metric threads and ball diameters are available on request.

Also, take a look at the "exposed" style 2 contact points.

Order Number

Ball diameter

B / C

Thread

Price

CP405

1/8" (.125")

.250" / .187"

4-48

21.50

CP406

5/32" (.156")

.250" / .187"

4-48

21.50

CP407

3/16" (.188")

.250" / .187"

4-48

21.50

CP423

1/4" (.25")

.250" / .218"

M2.5

28.50

CP409

1/4" (.25")

.250" / .218"

4-48

28.50

CP412

3/8" (.375")

.312" / .250"

4-48

28.50

CP414

1/2" (.5")

.375" / .250"

4-48

28.50

Knife Edge Point, carbide tipped

 

MTC4701

These carbide tipped knife edge points have 30° edges and are equivalent to Mitutoyo knife edge points. They can be used as substitutes for other manufacturers' points as well.
 

Order Number

Mitutoyo

Length (L)

Diameter (Ø)

Thread

Price

MTC47-01

131282

0.6"

0.2"

4-48

39.00

MTC47-02

120067

15 mm

5 mm

M2.5

39.00

Flat AGD contact point (steel)

 

MTC0828

Standard steel contact points come in a variety of lengths. Additional lengths can be attained by using contact point extensions. All have a flat .187" diameter.

 

Order Number

Length

Diameter

Thread

Price

MTC08-02

3/8"

5 mm

4-48

9.00

MTC08-03

1/2"

5 mm

4-48

9.00

MTC08-07

1"

5 mm

4-48

9.00

MTC08-28

10 mm

5 mm

M2.5

9.00

MTC08-31

25 mm

5 mm

M2.5

9.50

Mitutoyo style needle point (tapered steel)

 

IMG_1248

Shown above are MTC46-13, MTC46-14 and MTC46-15

These black anodized steel contact points are tapered to a rounded end which has a radius of approximately .025". The angle of the taper changes depending on the length of the point. At its widest point, the base, it will measure 5 mm. Although designed for Mitutoyo dial indicators, these will fit any other brand of indicator. Just be sure to select the correct thread size.

 

Order Number

Length

Mitutoyo part #

Thread

Price

MTC46-13

0.6"

21AAA030

4-48

12.50

MTC46-14

1"

21AAA046

4-48

12.50

MTC46-15

1.5"

21AAA047

4-48

12.50

MTC46-16

2"

21AAA048

4-48

12.50

MTC46-17

15 mm

101121

M2.5

12.50

MTC46-18

17 mm

137413

M2.5

12.50

 

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.
 

 

From our reference shelf:

The Companion Reference Book on Dial and Test Indicators … page 178
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
 

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