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Cleveland C27642 straight flute tap, cobalt with black oxide finish, 3/8"-16 semi-bottoming

Cleveland

Cleveland C27642 Straight Flute Tap 3/8"-16 Semi-Bottoming

SKU CH-5T4Z-N188G

Creates UNC 3/8"-16 threads with a semi-bottoming cobalt tap, 2.94 in overall length and 0.75 in thread length

  • Product typeTaps
  • 3/8"-16 UNC thread fits standard coarse fasteners
  • Semi-bottoming design threads close to blind-hole bottoms
  • Cobalt construction with black oxide resists wear and heat
  • 94" overall length reaches deeper holes
  • H3 limit and 2B class ensure precise fit

Cleveland 3/8"-16 UNC Straight Flute Tap

This Cleveland C27642 straight flute tap cuts 3/8"-16 UNC threads in a single pass. The tool is made from cobalt steel with a black oxide and nitride surface treatment for wear resistance. Its semi-bottoming chamfer allows threading close to the bottom of a blind hole. Overall length is 2.94 inches with a 0.75 inch thread length.

Machinists needing a 3/8"-16 UNC thread in ferrous

The H3 thread limit and 2B class of fit suit general-purpose production and maintenance work where standard tolerance is required. The 75 percent thread drill size is 5/16 inch, a detail the machinist must verify before tapping. This tap is not for left-hand threads, pipe threads, or metric thread forms, and it does not suit applications needing a spiral-point or spiral-flute geometry for chip evacuation in deep holes.

Semi-bottoming chamfer for blind-hole threading

The semi-bottoming design is the single specification that determines whether this tap reaches the required depth in a blind hole without bottoming out. Buyers who need a taper or plug chamfer for through-holes, or a full-bottoming chamfer for maximum thread depth, should select a different tap style.

How it compares

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

Price $15.99
Cheaper than about 73% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCLEVELAND
Product typeTaps

Questions about this item

What does the 3/8"-16 size mean when I use this tap in a real job?

It cuts a 3/8 inch diameter thread with 16 threads per inch, the standard UNC coarse pitch for that diameter.

How does the H3 thread limit affect what the tap actually produces?

H3 is a standard tolerance class that yields a class 2B fit when the hole is drilled to 5/16 inch.

What do I need to fit this 2.94 inch tap in my holder or machine?

The 2.94 inch overall length and 0.75 inch thread length fit standard tap holders and drill-press spindles for hand or machine tapping.

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