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Cleveland straight-flute hand tap, bright steel finish, 6 flutes, plug style

Cleveland

Cleveland C55001 Straight Flute Hand Tap 1-1/4"-12 UNF Plug 6 Flutes H4

SKU CH-M6W5-GRC9C

Cuts precise 1-1/4"-12 UNF threads in through-holes using a six-flute high-speed steel plug tap with H4 limits

  • Product typeTaps
  • Cuts precise 1-1/4"-12 UNF threads with H4 tolerance
  • Straight flute design clears chips in through-holes and blind holes
  • Six flutes distribute cutting load for smoother thread finish
  • High-speed steel construction resists wear on steel and alloy workpieces
  • Plug chamfer starts easily and produces full threads to depth

Cleveland C55001 Straight Flute Hand Tap

The Cleveland C55001 is a straight flute hand tap designed for cutting internal UNF threads in a 1-1/4"-12 size. It suits machinists and maintenance technicians who need to create or repair threaded holes in metal components using hand tools. The H4 thread limit targets a Class 2B fit for standard applications. This plug chamfer style helps start threads in through-holes or deep blind holes with adequate clearance.

High-speed steel construction with bright finish

The tap is manufactured from high-speed steel and features a bright, uncoated surface finish. Six straight flutes provide chip clearance and cutting fluid flow during manual operation. A right-hand cutting direction matches standard fastener threads. The overall length measures 5 3/4 inches with a thread length of 2 9/16 inches, offering reach for deeper holes. The recommended 75 percent thread drill size is 1.1688 inches for proper hole preparation.

Replaces worn or missing taps for UNF threads

This tap replaces damaged or lost tooling when cutting 1-1/4"-12 UNF threads by hand. The upgrade is worthwhile when existing taps produce oversized threads, chip poorly, or fail to start cleanly in the workpiece. The H4 limit addresses fit issues where a tighter tolerance than standard is required for the assembly. It is not suited for machine tapping operations, spiral point requirements, or left-hand thread applications.

How it compares

Measured against everything we stock in Bits, Hole Saws & Accessory Kits, at today’s prices. Recalculated every night.

Price $145.99
Pricier than about 90% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCLEVELAND
Product typeTaps

Questions about this item

What thread standard does the 1-1/4"-12 tap follow and what class of fit does it produce?

It follows the UNF standard and produces a 2B class of fit for unified fine threads.

What drill size is required before tapping with this H4 limit tool?

The 75 percent thread drill size is 1.1688 in for proper hole preparation.

How do you start the tap correctly in the hole to avoid cross-threading?

Apply steady pressure while turning the square drive clockwise, keeping the tap perpendicular to the workpiece so the plug chamfer engages cleanly.

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