Macstroc Pipe Groove Measuring Tape, GMT-100

The Macstroc GMT-100 Pipe Diameter Tape Measure is a high-precision groove measuring tool engineered for professionals working with roll groovers and grooved pipe systems. Made from durable, flexible material, the GMT-100 allows quick and accurate measurement of pipe outer diameter (OD) and proper groove positioning from the pipe end. Essential for verifying groove placement according to industry standards, it helps ensure leak-proof, safe, and compliant installations with grooved couplings. Whether you’re working in fire protection, HVAC, plumbing, or industrial piping, the Macstroc GMT-100 saves time, reduces errors, and boosts efficiency. Its compact design and easy-to-read markings make it an essential tool for every grooving technician and pipefitter.

How to Use a Groove Measuring Tape

Step-by-Step Instructions:

Wrap the Tape Around the Pipe

Position the GMT-100 groove measuring tape around the pipe where you intend to groove

Ensure it’s tight and level without twists

Check the Pipe Outer Diameter (OD)

Read the OD from the tape where it overlaps itself

Confirm that the pipe’s OD matches the required size for grooving

This is critical to ensure proper engagement with grooved couplings like Victaulic or Gruvlok

Mark the Groove Location

Use the printed reference on the tape to mark the correct groove distance from the pipe end (usually 2–2.25 Inch depending on pipe size)

Groove location is based on industry specs (like AWWA C606) or coupling manufacturer’s standards

Verify Straightness

Make sure the mark is perfectly perpendicular to the pipe axis

For large pipes, rotate and recheck from other sides

Roll Groove the Pipe

Place the pipe into the roll grooving machine (e.g., Macstroc MRG-12V2)

Align the grooving dies exactly at the marked line

Groove the pipe to correct depth and width as per the coupling manufacturer’s specification