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Choose your preferred unit to view instructions online or download the PDF for offline use.
Example:
Make certain the tape and object to be measured are both clean.
Each line on the gage member represents .010” of diameter, while each line on the
vernier represents .001”.
Wrap the tape around the object to be measured. The vernier scale should be just below
the gage member. Tighten the tape around the object with 5 pounds tension.
Locate the “zero” on the vernier scale and note the highest value achieved on the gage
member above it (the highest value to the left of the zero). In this example, the value is 9
inches plus 4 lines or .94.
Next, observe the vernier scale’s value at the point where it lines up exactly with a marked
division line on the gage member. In this example, the value is 6 (.006”).
Finally, to obtain the diameter of the object, simply add the two values together:
.94“ + .006” = .946“
Direct Inside Diameter tapes are not available in this style.
These Pi Tape® gages are guaranteed to ± .001” tolerance.
Tape resolution 0.001″
Example:
Make certain the tape and object to be measured are both clean.
Each line on the gage member represents .025” of diameter, while each line on the vernier
represents .001”.
Wrap the tape around the object to be measured. The vernier scale should be just below the
gage member. Tighten the tape around the object with 5 pounds tension for O.D. tapes (For I.D. tapes, use 0
pounds tension).
Locate the “zero” on the vernier scale and note the highest value achieved on the gage member above it (the
highest value to the left of the zero). In this example, the value is 20.050”.
Next, observe the vernier scale’s value at the point where it lines up exactly with a marked division line on the
gage member. In this example, the value is 15 (.015”).
Finally, to obtain the diameter of the object, simply add the two values together:
20.050” + .015” = 20.065”.
When using a standard O.D. tape on an I.D. surface, add double the tape thickness to the reading
to arrive at the I.D. of the part. It is suggested that direct I.D. tapes be used for inside diameter readings.
As a suggestion for checking very large diameters – pieces of masking tape can be used to hold the tape in the
proper parallel position.
Tape resolution 0.001″
Example:
Make certain the tape and object to be measured are both clean.
Each line on the gage member represents 1mm of diameter, while each line on the
vernier represents .05mm.
Wrap the tape around the object to be measured. The vernier scale should be just below
the gage member. Tighten the tape around the object with 2.25 kg tension.
Locate the “zero” on the vernier scale and note the highest value achieved on the gage member above it (the
highest value to the left of the zero) In this example, the value is 80mm.
Next, observe the vernier scale’s value at the point where it lines up exactly with a marked
division line on the gage member. In this example, the value is 4 (0.40mm).
Finally, to obtain the diameter of the object, simply add the two values together:
80mm + .40mm = 80.40mm.
If no line on the vernier lines up exactly, an extension of .05mm can be made to .025mm by interpolating the
distance between vernier lines.
Direct Inside Diameter tapes are not available in this style.
This Pi Tape® gage is guaranteed ± .06mm tolerance.
Tape resolution 0.05mm
Example:
Make certain the tape and object to be measured are both clean.
Each line on the gage member represents .25mm of diameter, while each line on the vernier represents .01mm.
Wrap the tape around the object to be measured. The vernier scale should be just below the
gage member. Tighten the tape around the object with 2.25 kg tension.
Locate the “zero” on the vernier scale and note the highest value achieved on the gage member above it (the
highest value to the left of the zero). In this example, the value is 27mm
plus 3 lines or 27.75mm.
Next, observe the vernier scale’s value at the point where it lines up exactly with a marked
division line on the gage member. In this example, the value is 15 (0.15mm).
Finally, to obtain the diameter of the object, simply add the two values together:
27.75mm + .15mm = 27.90mm.
Direct Inside Diameter tapes are not available in this style.
These Pi Tape® gages are guaranteed to ± .03mm tolerance.
Tape resolution 0.01mm
Example:
Make certain the tape and object to be measured are both clean.
Each line on the gage member represents .5mm of diameter, while each line on the vernier
represents .01mm.
Wrap the tape around the object to be measured. The vernier scale should be just below the gage member.
Tighten the tape around the object with 2.25 kg tension for O.D. tapes (For I.D. tapes,
use 0 kg tension).
Locate the “zero” on the vernier scale and note the highest value achieved on the gage member above it (the
highest value to the left of the zero). In this example, the value is 660.0mm.
Next, observe the vernier scale’s value at the point where it lines up exactly with a marked division line on the
gage member. In this example, the value is 23 (0.23mm).
Finally, to obtain the diameter of the object, simply add the two values together:
660.0mm + 0.23mm = 660.23mm.
When using a standard O.D. tape on an I.D. surface, add double the tape thickness to the reading
to arrive at the I.D. of the part. It is suggested that direct I.D. tapes be used for inside diameter readings.
As a suggestion for checking very large diameters – pieces of masking tape can be used to hold the tape in the
proper parallel position.
Tape resolution 0.01mm
Outside Diameter (in)
Outside Diameter (mm)
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