Keson Industries PD618N 6 ft Diameter Tape Measure

Keson PD618N Diameter Tape

The Keson PD618N is a 6 ft diameter tape measure built for mechanics and pipe fitters who need to read a round object's diameter directly. Its steel blade carries two calibrated scales so the user does not have to divide circumference by pi. A molded rubber grip on the closed steel case keeps the tool secure in oily hands.

Sustained Use on Steel Pipe

The steel blade resists stretching over repeated pulls, so the 1/100 in and 1/16 in graduations stay accurate across long jobs. No lock mechanism means the tape retracts freely each time, reducing the chance of a jammed spring when dirt or coolant gets inside the case. The loop tip hooks over a pipe end without a second person holding the zero mark.

SAE Diameter Scale Limits

The blade is calibrated in units of pi, so it reports diameter only when the measured object is a true circle. Oval flanges, crushed conduit or irregular castings will give a reading that does not match any real dimension. The 1/4 in blade width and 6 ft length restrict use to pipes and cylinders that fit within that circumference range.