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Compac Test Indicator Contact Point
Genuine MTC contact points with stainless steel bodies

We also have contact points for the following indicators:

  • Bestest and TesaTast M1.4 … page 218
  • Interapid M1.7 carbide, ruby and Teflon contact points … page 21
  • Mitutoyo M1.7 test indicator contact points … page 186
  • Starrett test indicator contact points … page 239
  • contact points for dial indicators

Related topics

  • Bestest indicator specifications … page 4
  • Bestest indicator repair manual … page 117
  • Tesatast contact points … see below
  • Cosine error: How to compensate … page 69
  • Ruby, Teflon and Nylon points avoid scratching surfaces, are non-conductive … page 69
     

Compac M1.6

 

How are Compac test indicator contact points measured? The catalog lenght is measured from the end of the thread to the center of the ball. The actual usable length (from the shoulder to the center of the ball) is shown in parentheses. Thread size is M1.6

Carbide .080" (2 mm) contact points come standard with new indicators. They are highlighted in the section below.

Model

Length

Ball Diameter

Price

Our Ordering Number

Manufacturer Equivalents

214A + 214GA
215A + 215GA
224A + 224GA
225A + 225GA
234A + 234GA
235A + 235GA
245A + 245GA

.72"
(.575")

.015" carbide

$21.50

MTC25-01 buy now

none

.031" carbide

$19.50

MTC25-02 buy now

18.66011

.080" carbide

$19.50

MTC25-05 buy now

18.66005

.120" carbide

$19.50

MTC25-07 buy now

none

.040" ruby

$29.50

MTC25-08 buy now

none

.080" ruby

$29.50

MTC25-09 buy now

none

.120" ruby

$29.50

MTC25-11 buy now

none

Model

Length

Ball Diameter

Price

Our Ordering Number

Manufacturer Equivalents

213LA
213GLA
223LA
223GLA
233LA
233GLA

1.44"
(1.30")

.015" carbide

$21.50

MTC25-12 buy now

none

.031" carbide

$19.50

MTC25-13 buy now

18.66024

.080" carbide

$19.50

MTC25-16 buy now

18.66009

Model

Length

Ball Diameter

Price

Our Ordering Number

Manufacturer Equivalents

244A
244GA

.67"

.015" carbide

$21.50

MTC25-23 buy now

none

.031" carbide

$19.50

MTC25-24 buy now

18.66010

.080" carbide

$19.50

MTC25-27 buy now

18.66007

.120" carbide

$19.50

MTC25-29 buy now

none

Model

Length

Ball Diameter

Price

Our Ordering Number

Manufacturer Equivalents

244LA
244GLA

1.65"

.031" carbide

$19.50

MTC26-02 buy now

none

.080" carbide

$19.50

MTC26-05 buy now

18.66008

.120" carbide

$19.50

MTC26-07 buy now

none

Model

Length

Ball Diameter

Price

Our Ordering Number

Manufacturer Equivalents

213 + 213G
215 + 215G
216G
223 + 223G
225 + 225G
233 + 233G
235 + 235G
242 + 242G
245 + 245G

18 mm

0.8 mm carbide

$19.50

MTC26-09 buy now

18.66014

2 mm carbide

$19.50

MTC26-12 buy now

18.66003

3 mm carbide

$19.50

MTC26-14 buy now

18.66021

Model

Length

Ball Diameter

Price

Our Ordering Number

Manufacturer Equivalents

212L
212GL
215GL
222L
222GL
232L
232GL

36 mm

0.8 mm carbide

$19.50

MTC26-16 buy now

18.66016

2 mm carbide

$19.50

MTC26-19 buy now

18.66004

3 mm carbide

$19.50

MTC26-21 buy now

18.66023

Model

Length

Ball Diameter

Price

Our Ordering Number

Manufacturer Equivalents

243L
243GL

45 mm

0.8 mm carbide

$19.50

MTC27-02 buy now

18.66015

2 mm carbide

$19.50

MTC27-05 buy now

18.66006

3 mm carbide

$19.50

MTC27-07 buy now

18.66022

Mercer (Swiss made)

 

Swiss made Mercer test indicators use the same contact points as Compac (shown on this page). You can order any Compac contact point providing the length (L) is the same. Use the chart below to determine the correct length for your particular models.

A word of caution: don't confuse these Mercer model numbers with the Interapid metric indicators, some of which have the same numbers (312-1 for example)! Although the Mercer models are all discontinued, you can still use the Compac points.

Mercer model

Contact Point Length

303-1

.72"

312-1

1.44"

301-1
305-1
306-1

.67"

310-1

1.65"

302-1
304-1
307-1

18 mm

313-1

36 mm

311-1

45 mm

Which contact point to choose?

 

 

Contact points are always available from Long Island Indicator Service. There are four components to take into consideration.

  • ball diameter
  • thread diameter
  • contact point length
  • ball composition

New indicators come supplied with .080" diameter balls as standard. We list the most common sizes below, but for special needs other diameters are often available. Thread diameters vary from manufacturer to manufacturer but are generally metric threads. Manufacturers differ in their method of measuring contact point lengths. It is imperative that the correct length point is used. Refer to the charts below for details on how the length is determined.

What are the contact points made of?

Our contact points are turned from #303 stainless steel and have carbide, ruby, Nylon or Teflon balls.

  • "Alloy 303 is a non-magnetic, austenitic stainless steel that is not hardenable by heat treatment. It is the free machining modification of the basic 18% chromium / 8% nickel stainless steel." [source: pennstainless.com/stainless grades]
  • austenite = a solid solution of carbon in a nonmagnetic form of iron, stable at high temperatures. It is a constituent of some forms of steel. [Oxford English Dictionary]

We recommend carbide balls over chrome or steel for its durability. For special applications you may need the ruby, sapphire, teflon, nylon or some other exotic. Please email special requests.

The contact points listed here are home grown. They're every bit as good as the originals yet they cost less. We give you the manufacturer's ordering number for ease of reference. If you'd rather have the manufacturer's own contact points please send us a request for quotation.

How to install a contact point

Most test indicators come with a little wrench of some sort designed to help you tighten—or loosen—a contact point. Some points have a little hole drilled through them so that you can insert a pin which can then be used to twist the point. Others have two flat spots designed to work with the wrenches supplied. Still others have a hexagonal area which works very well with a pair or small pliers. In all cases, small pliers can be used to remove and tighten contact points. Make sure they are nice and snug, hand tightened only. You don't want to force any contact point that refuses to co-operate. Try another point instead. The thread may be damaged, or you may be using a point with the wrong thread. If the thread breaks off inside the indicator, you may have a hard time getting it out and a repair might then be in order.


Xcelite L4G Sub-Miniature Needle Nose Plier with Green Cushion Grip Handle, Smooth Jaw, 4" Length, 13/16" Jaw Length
 

 

Long Island Indicator Companion Reference Book, 2nd Edition … 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
Mitutoyo Test Indicator Repair Manual … page 102
 

www.longislandindicator.com

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


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This page's most recent revision: 27 OCTOBER 2017
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Original photographs and content copyright 2017 by JWGrum

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