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Silver metal tap with three straight flutes and square shank

Helicoil

Helicoil 1/4"-28 Straight Flute Hand Tap Plug H2 3-Flute

SKU CH-2FP7-2CHHH

Creates precise UNF threads in 1/4"-28 holes using three-flute high-speed steel

  • TypeHole, Drill, Bore & Wire Gauges
  • Precise thread repair for 1/4"-28 UNF holes
  • High-speed steel construction resists wear during tapping
  • Plug chamfer starts threads smoothly in through-holes
  • Three-flute design clears chips efficiently while cutting
  • H2 limit ensures Class 3B fit accuracy

Thread Repair Tap

This Helicoil straight-flute hand tap creates unified fine threads for screw-thread inserts in a 1/4"-28 UNF size. The H2 limit and 3B class of fit deliver the precise tolerance required for reliable STI installations. High-speed steel construction with a bright finish resists wear during repeated hand-tapping operations.

Replaces Worn Or Mismatched Taps

Switch to this plug-chamfer tool when an existing tap produces loose inserts or fails to start cleanly in the drilled hole. The 1.125-inch thread length and three-flute geometry improve chip clearance compared with two-flute or taper-chamfer alternatives. The upgrade is justified when thread engagement must meet strict 3B specifications.

Suits Technicians Repairing Stripped Threads

Mechanics and maintenance staff restoring damaged holes in aluminium, steel or plastic components will find the dimensions match standard STI drill charts. The right-hand cut and plug lead work with conventional tap handles. Buyers needing left-hand threads, bottoming chamfers or larger diameters should select a different tap.

Highlights

  • Precise thread repair for 1/4"-28 UNF holes
  • High-speed steel construction resists wear during tapping
  • Plug chamfer starts threads smoothly in through-holes
  • Three-flute design clears chips efficiently while cutting
  • H2 limit ensures Class 3B fit accuracy

Specifications

BrandHelicoil
TypeHole, Drill, Bore & Wire Gauges

Questions about this item

What overall length and thread length does the 1/4"-28 tap have?

The tap measures 2 23/32 inches overall with a 1.125 inch thread length.

How do I start the tap straight in the hole?

Apply steady axial pressure while turning the square drive; the plug chamfer helps alignment but forcing it off-centre strips the first threads.

When should I replace this H2 high-speed steel tap?

Replace it when the three flutes show rounded crests or when threads cut in 3B-class holes begin to gauge oversize.

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