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Measuring Rods - Micrometer Standards - Calibration Rod
for caliper and micrometer calibration

 

The inch and metric measuring rods shown below are designed for calibrating large outside micrometers and calipers of all sizes. It eliminates the need to wring many gage blocks together, a tricky and risky undertaking.

measuring rod

This photo shows a 3" measuring rod being used to calibrate an Etalon vernier caliper. Handle the measuring rods by the plastic heat shields. This prevents the metal from expanding unnecessarily.

The manufacturing accuracy shown below assures you that these standards are perfectly suitable for any .001" measuring micrometer or dial calipers.

  • Mitutoyo Corporation conducts quality assurance under the ISO 9000 quality management system.
  • These measuring rods conform to the Mitutoyo inspections standards and are calibrated to ASME B89.1.13. (Calibration certificates not included)
  • The standards used for manufacturing are traceable to national and international standards.
  • One-year manufacturer's warranty
  • Uncertainty of measurement = (4.0 + 4.0L) µin for rods up to 40” in length

Measuring rods series 599 are made in USA. Measuring rods series 167 are made in Japan by Mitutoyo. All Japanese measuring rods have one or more heat insulating handles on them.

Important: Certificate of Calibration is not included and not available from us. The manufacturer guarantees accuracy as stated below. If you need verification in the form of a certificate, you will have to send the rods to an accredited calibration laboratory of your choice.


 

Order number

Size

± Accuracy

Rod diameter (1)

Wood case
included (2)

Price (USD)

167-141

1"

.00005"

.25"

no

50.50

167-142

2"

.00010"

.25"

no

51.70

167-143

3"

.00010"

.25"

no

55.35

167-144

4"

.00010"

.31"

no

60.20

167-145

5"

.00015"

.31"

no

62.50

167-146

6"

.00015"

.31"

no

65.15

167-148

8"

.00015"

.37"

no

75.65

167-149

9"

.00020"

.37"

no

95.00

167-150

10"

.00020"

.37"

no

101.80

167-151

11"

.00025"

.37"

no

105.00

167-152

12"

.00025"

.37"

no

92.35

167-154

14"

.00025"

.37"

no

117.85

167-155

15"

.00025"

.37"

no

122.25

167-156

16"

.00025"

.37"

no

129.45

167-157

17"

.00025"

.37"

no

138.40

167-158

18"

.00025"

.37"

no

123.70

167-159

19"

.00030"

.37"

no

152.20

167-160

20"

.00030"

no

159.00

167-161

21"

.00030"

.47"

yes

167.00

599-9655-22

22"

.00030"

no

132.00

167-164

24"

.00030"

.47"

yes

153.00

167-176

36"

.00035"

.47"

yes

297.00

167-412

48"

.00040"

.47"

yes

299.00 (*)

 

(*) only one 48" long rod remains at this special price.

 

Other rods up to 79" in length are available on request. Sizes above 24-inches are not always stocked. Please inquire before placing an order.

 

(2) Some longer rods come in individual wooden cases. Smaller rods will fit into one of the wooden cases offered separately (see below).

 

(1) This is the diameter of the bare steel rod. All sizes have heat-insulating plastic shields on them. The listed diameter does not include the size of these plastic heat shields. If necessary, the heat shields could be removed, although with considerable difficulty.

 

You may order on-line by selecting any linked order number. Please inquire about sizes not shown.

 

Hints on using measuring rods

 

Measuring rods ship with plastic caps on the ends of the rod, designed to protect the ends from scratches and dings. You must remove these caps before you use the rod. They may be red, amber, or more recently silver in color. When storing the rods between use, you would be wise to put the caps back on.

Before using micrometer standards or measuring rods to calibrate your micrometers or calipers, practice using them on a new gage, or one that has just been certified. This allows you to check that you can get the same readings, time after time, with your rods. When you are confident that you have mastered the technique, you can move on to your other gages.

Measuring rods do not actually "wring" to the surfaces of your micrometer or calipers, but you have to eliminate all sideways play, however minute, and this is done somewhat like wringing gage blocks.

Finally, be sure that your measuring rods and your calipers or micrometers are both at room temperature. If you don't think this matters, just try an experiment. You can easily be off by .001" over 4 inches if the calipers are in an air-conditioned room and the rods have been sitting under a heat lamp.



Mitutoyo 534-118 Vernier Caliper, Steel, Nib Style, Long Jaw, 0-20" Range

Long measuring rods make it easy to calibrate the larger calipers. Since holding the measuring rod horizontally is a bit like balancing a beam, you may find that holding the rod and the tool vertically gives you more reliable results.


 

Questions on measuring rods

 

Q: Is it possible to use two or three smaller size rods placed together?

  • That is not practical unless you create some sort of clamping system which will hold them in place.

Q: I have a set of 0-40" calipers that I am trying to find a way to calibrate in house. I've been told that we would have to measure the calipers in a few different places, not just the full 40".

  • If you are using the 40" caliper throughout its full range, then you would want to calibrate it at least every 6 inches. If there is just one area of the range you normally use, you can concentrate on just that dimension, reducing the number of rods you will need. A calibration lab would calibrate these at one-inch intervals.

     



 

 

LONG ISLAND INDICATOR REPAIR MANUALS

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
 

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This page's most recent revision: 12 OCTOBER 2017
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Original photographs and content copyright 2017 by JWGrum

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