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Straight flute pipe tap plug HSS 3/8-18 uncoated finish 4 flutes .688 shank diameter

Helicoil

Helicoil Straight Flute Pipe Tap Plug HSS 3/8-18 hand tool

SKU CH-ZE1C-MMMGS

Cuts precise 3/8-18 NPT threads with a .688 in. shank for Helicoil inserts

  • Cuts precise NPT threads for reliable pipe connections with 18 threads per inch
  • High-speed steel construction resists wear during repeated tapping operations
  • Four-flute design clears chips efficiently for smoother cutting action
  • Plug-style lead starts threads easily in through-holes and blind holes
  • 688-inch shank diameter fits standard tap handles and wrenches

Straight Flute Pipe Tap for Thread Inserts

This straight flute pipe tap is a hand tool designed to cut precise internal threads for Helicoil screw thread inserts. It is made from uncoated high-speed steel and follows ANSI standards. The plug lead style suits general purpose threading tasks in a workshop or maintenance setting.

For Mechanics Cutting NPT Threads

The tap suits technicians who need to prepare holes for free running or screw locking inserts in pipe fittings. It is not for buyers who need a bottoming or taper lead tap, or for those requiring a coated tool for high volume production runs on harder alloys.

Check Shank Diameter and Pitch Before Use

Verify that your tool holder or wrench accommodates the 0.688 In. shank diameter before ordering. Confirm the workpiece requires a 3/8 In. size with an 18 pitch NPT thread form. Ensure the material is compatible with uncoated high-speed steel cutting edges.

How it compares

Measured against everything we stock in Utility & Specialty Hand Tools, at today’s prices. Recalculated every night.

Price $170.99
Pricier than about 90% of the 2,474 comparable items (median $23.99).

Specifications

No published specifications for this item yet.

Questions about this item

What size tap drill do I need to use with the 3/8-18 Helicoil pipe tap?

The tap has a pitch of 18 threads per inch and a shank diameter of .688 in., so select the matching NPT drill size for that specification.

Will this tap work with standard NPT pipe fittings I already have?

Yes, it cuts NPT threads to ANSI standards and is designed for both free running and screw locking inserts.

How can I verify the threads are cut correctly after using the tap?

Check that the finished threads accept the matching Helicoil insert smoothly and that the plug lead produces a full thread depth to the ANSI H3 limit.

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