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White ABS case with 6 ft steel tape calibrated in pi units

Keson Industries

Keson Industries D18646 6 ft Wrap-a-Round Diameter Tape Measure 1/4 in Blade

SKU CH-X6AS-CWA5F MPN D18646

A steel diameter tape calibrated in pi units measures 6 ft with 1/32 in graduations for the first 12 in and 1/16 in thereafter

  • Overall length1.9
  • Overall width1.9
  • Product typeLong
  • Calibrated in pi units for direct diameter reading
  • 6 ft blade length covers large pipes and cylinders
  • 1/16 in graduations after first 12 in
  • Lacquer-coated steel blade resists wear and corrosion
  • Automatic rewind with ABS case for quick storage

Diameter tape for pipes and cylinders

This diameter tape reads the outside measurement of a pipe or cylinder directly, calibrated in units of 3.14 so the displayed number equals the diameter. The 6 ft steel blade is 1/4 in wide with 1/32 in graduations for the first 12 in and 1/16 in thereafter. An automatic rewind and closed ABS case protect the lacquer-coated blade.

Trades needing quick pipe sizing, not general layout

Plumbers, HVAC technicians and maintenance crews who size pipe, duct or tube on site will benefit from the direct diameter readout. Builders laying out studs, framers checking square or anyone needing a standard linear tape for distance work should choose a conventional measure instead.

6 ft blade calibrated in pi units

The single specification that decides fit is the blade length of 6 ft combined with graduations calibrated in units of 3.14, which converts circumference to diameter without calculation. If the job requires longer reach or linear-only readings, this model will not suit.

How it compares

Measured against everything we stock in Measuring Tapes & Wheels, at today’s prices. Recalculated every night.

Price $10.99
Cheaper than about 80% of the 305 comparable items (median $17.99).

Specifications

Product
Brand nameKeson Industries
Model nameD18646
Product typeLong

Questions about this item

How does the 3.14 calibration let me read diameter directly?

The blade is graduated in units of 3.14 so that wrapping it around a pipe gives the circumference divided by pi, showing the diameter without calculation.

What does the 1/32 in graduation on the first 12 in provide?

It gives finer resolution on the first 12 in of the 6 ft blade, then switches to 1/16 in graduations for the remaining length.

What case and belt attachment does the 1.900 by 1.900 in housing have?

The closed ABS plastic case measures 1.900 by 1.900 in and has no belt clip; the blade rewinds automatically.

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