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Silver metal hand tap with straight flutes, 3/4"-10 UNC plug, TiN coated high speed steel

Cleveland

Cleveland C55144 Straight Flute Hand Tap 3/4"-10 Plug

SKU CH-475J-6S89A

Cuts 3/4"-10 UNC threads in a 4.25-inch high-speed steel tap with TiN coating and H3 limit

  • Product typeTaps
  • 3/4"-10 UNC thread cuts standard coarse holes
  • Plug chamfer starts threads easily in through-holes
  • High-speed steel with TiN coating resists wear
  • 25 in overall length reaches deep work
  • 75 % thread drill size 16.50 mm guides accurate tapping

Cleveland C55144 Straight Flute Hand Tap

This Cleveland C55144 is a straight flute hand tap designed for creating 3/4"-10 UNC threads in a range of materials. It suits machinists and maintenance technicians who need to cut internal threads by hand or with a tapping head. The plug chamfer makes it a versatile choice for both through holes and blind holes with adequate clearance.

High Speed Steel construction with TiN coating

The tap is manufactured from High Speed Steel and features a TiN coating that enhances wear resistance and tool life. Its straight flute design is standard for general purpose threading and allows chips to collect in the flutes during hand operation. The 4.25 in overall length and 2 in thread length provide sufficient reach for typical applications while the H3 thread limit targets a 2B class of fit.

Practical limits of UNC hand tapping

This tool cuts a 3/4"-10 UNC thread to a 2B class of fit using an H3 limit, requiring a 16.50 mm drill size for approximately 75 percent thread engagement. As a straight flute hand tap, it relies on the operator to break and clear chips, which limits its efficiency in deep blind holes or high volume production. The right hand cut direction follows standard convention for the specified thread form.

How it compares

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

Price $50.99
Pricier than about 68% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCLEVELAND
Product typeTaps

Questions about this item

What thread standard does the 3/4"-10 UNC tap follow and what class of fit does it produce?

The tap follows the UNC standard and produces a 2B class of fit with an H3 thread limit.

What hole diameter is required for the 75 percent thread depth this tap is designed for?

A 16.50 mm drill size is specified for the 75 percent thread depth.

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

Apply steady pressure while turning the square drive clockwise, keeping the tap perpendicular to the 4.25 in long workpiece.

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