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Silver metal tap with straight flutes, 4.25 in long, TiN coated tip

Cleveland

Cleveland C55146 Straight Flute Hand Tap 3/4"-16 Plug

SKU CH-DATF-FFKXM

Straight-flute hand tap cuts UNF 3/4"-16 threads with TiN-coated high-speed steel for 75 % thread depth

  • Product typeTaps
  • Cuts precise UNF threads in a single pass with the 3/4"-16 plug design
  • High-speed steel body resists wear for repeatable production runs
  • TiN coating lowers friction and extends tool life in tough materials
  • 25 in overall length provides reach for deep-hole applications
  • 75 % thread drill size of 17.50 mm ensures correct hole preparation

Cleveland C55146 Straight Flute Hand Tap

The Cleveland C55146 is a straight flute hand tap designed for creating UNF threads in a 3/4"-16 size. It suits maintenance technicians and machinists who need to cut internal threads by hand in through-holes or blind holes. The high-speed steel construction with TiN coating supports general-purpose threading tasks in steel and non-ferrous metals. This plug-chamfer tool starts threads easily in existing holes.

Sustained hand-tapping performance

Under continuous hand operation the straight flute design evacuates chips forward through the flutes, reducing binding during deeper cuts. The 2-inch thread length allows multiple passes without frequent tool withdrawal. TiN coating lowers friction and resists wear when tapping successive holes in medium-carbon steels. Right-hand cutting geometry matches standard thread direction for consistent results across repeated use.

UNF 3/4"-16 interface limits

The 3/4"-16 UNF thread form requires a 17.50 mm drill size to achieve the 75 percent thread engagement specified for Class 2B fit. H3 thread limit controls the pitch diameter tolerance for proper assembly with mating fasteners. Overall length of 4.25 inches provides leverage for manual torque application. The plug chamfer cannot bottom threads in blind holes shallower than the chamfer lead.

How it compares

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

Price $49.99
Pricier than about 67% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCLEVELAND
Product typeTaps

Questions about this item

Does the TiN coating on this tap reduce heat buildup during extended threading?

The TiN coating on this high-speed steel tap lowers friction, which helps limit heat generation when cutting 3/4"-16 UNF threads over long sessions.

What size drill bit must I already own to prepare the hole for this 3/4"-16 tap?

A 17.50 mm drill bit is required to produce the 75 percent thread depth this tap is designed for.

Will the H3 thread limit on this tap still produce a 2B class of fit in older, slightly worn holes?

The H3 limit is ground for a 2B fit; in worn holes the fit may be looser than spec, so check the hole condition before tapping.

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