Precision ID O-Ring Tape

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.
Place the tape inside the object to be measured. The vernier scale should be behind the gage member. Make
certain the tape is aligned on the inside diameter flat and snug to the part, straight and parallel so the gage
member is flat against the vernier scale.
Locate the “zero” on the vernier scale and note the highest value achieved on the gage member below it (the
highest value to the left of the zero). In this example, the value is 661.5mm.
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 25 (0.25mm).
Finally, to obtain the diameter of the object, simply add the two values together:
661.5mm + 0.25mm = 661.75mm.
Inside diameter tapes are manufactured at 68ºF under no tension. All inside diameter tapes are marked I.D. and
are calibrated for direct 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