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Cleveland C55240 straight flute hand tap, silver steel finish

Cleveland

Cleveland C55240 Straight Flute Hand Tap 5/8"-11 UNC

SKU CH-EQKW-SS7TA

Straight flute hand tap cuts 5/8"-11 UNC threads in through-holes using high-speed steel with TiN coating

  • Product typeTaps
  • Cuts clean UNC threads with 5/8"-11 straight-flute design
  • High-speed steel body resists wear during repeated hand-tapping jobs
  • TiN coating lowers friction for smoother chip evacuation
  • 81 in thread length reaches deep holes without extension
  • 81 in overall length fits standard tap wrenches and guides

Cleveland C55240 Hand Tap 5/8"-11 UNC

This straight flute hand tap is designed for creating internal UNC threads in metal workpieces. It suits maintenance technicians and machinists who need to cut new threads or repair damaged ones in steel and similar materials. The TiN coating on high speed steel extends tool life during repeated hand-tapping operations.

Thread capacity and cutting depth

The tap cuts a 5/8 inch diameter thread with 11 threads per inch and a 1.81 inch thread length within a 3.81 inch overall length. A 75 percent thread drill size of 13.60 mm prepares the hole for a class 2B fit. The H3 thread limit controls tolerance for general-purpose threading, while bottoming chamfer allows threading close to the bottom of blind holes.

Right-hand UNC thread specification

The single specification that decides fit is the right-hand 5/8"-11 UNC thread form with H3 limit and 2B class of fit. This tap will not produce metric, left-hand, or fine-pitch threads, so buyers needing those thread standards must select a different tool.

How it compares

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

Price $38.99
Pricier than about 61% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCLEVELAND
Product typeTaps

Questions about this item

Will the 5/8"-11 UNC tap cut cleanly in an older cast-iron block without chipping?

The straight-flute design and high-speed steel body with TiN coating are suited for hand tapping cast iron; use cutting oil and the recommended 13.60 mm drill for a 75 percent thread.

How can I verify the tap is producing a correct 2B-class thread after setup?

Check the thread with a 5/8"-11 UNC 2B go/no-go gauge; the go gauge should enter fully and the no-go gauge should not pass more than three turns.

Does the box include a tap wrench or drill bit, or must I buy them separately?

Only the C55240 tap is supplied; a compatible tap wrench and a 13.60 mm drill bit for the 75 percent thread hole are sold separately.

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