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Cleveland C27658 straight flute tap, 7/16"-14 semi-bottoming, cobalt with black oxide finish

Cleveland

Cleveland C27658 Straight Flute Tap 7/16"-14 Semi-Bottoming pneumatic accessory

SKU CH-J09F-3GQBS

Cuts 7/16"-14 UNC threads in through or blind holes with a 0.88 in thread length and 3.16 in overall length

  • Product typeTaps
  • 7/16"-14 UNC thread cuts standard coarse threads
  • Semi-bottoming chamfer starts threads in blind holes
  • Cobalt construction with black oxide resists wear
  • 16" overall length reaches deeper holes
  • H5 thread limit ensures 2B class fit

Thread-cutting tool for 7/16"-14 UNC

This Cleveland C27658 straight flute tap cuts internal threads in a 7/16"-14 UNC size with a semi-bottoming chamfer. It is made from cobalt with a black oxide and nitride surface treatment for wear resistance. The tool suits machinists and maintenance technicians who need to produce Class 2B threads in through holes or blind holes where chip evacuation is straightforward.

Replaces worn or undersized taps

A new tap restores accurate pitch diameter when an existing tool has dulled or when a previous tap left threads out of tolerance. The H5 thread limit and 75 percent thread drill size U provide a tighter fit than standard H3 or H4 limits, making the upgrade worthwhile when the application demands stricter Class 2B conformity.

Fits standard tap holders and CNC tooling

The 3.16 in overall length and .88 in thread length allow the tap to reach into typical workholding setups without special extensions. Right-hand cutting direction matches conventional spindle rotation. Cobalt construction handles higher cutting temperatures than high-speed steel, freeing the operator from frequent tool changes in abrasive materials.

How it compares

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

Price $19.99
Cheaper than about 64% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCLEVELAND
Product typeTaps

Questions about this item

What drill size is required for the 7/16"-14 tap?

The 75 percent thread drill size is U for this 7/16"-14 tap.

How do I avoid breaking the straight flute tap in the hole?

Use cutting fluid, keep the tap perpendicular, and reverse frequently to clear chips from the straight flutes.

When should this cobalt tap be replaced?

Replace the tap when threads show poor finish, cutting requires excessive force, or the black oxide coating is worn away.

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