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Cleveland 57149 spiral point tap 5/16-18 UNC two flutes HSS bright finish

Cleveland

Cleveland 57149 Spiral Point Tap 5/16-18 UNC 2 Flutes HSS

SKU CH-K9CV-EMNWE

Cuts 5/16"-18 UNC threads in through-holes using a spiral-point HSS tap with two flutes and H1 limit for 75 percent thread engagement

  • TypeTaps
  • Creates clean threads in through-holes with 5/16"-18 UNC sizing
  • Spiral point design pushes chips forward for smoother tapping
  • Two-flute high-speed steel construction resists wear during use
  • Right-hand cutting orientation matches standard threading requirements
  • Bright uncoated finish suits general-purpose metalworking applications

Spiral Point Tap 5/16-18 UNC

The Cleveland 57149 is a spiral point tap designed for creating 5/16-18 UNC threads in through holes. It suits mechanics and machinists who need a right-hand cutting tool made from high speed steel for general purpose threading tasks.

Plug chamfer limits blind-hole use

The plug chamfer on this tap requires sufficient hole depth beyond the thread length for the lead to engage properly. It is not suitable for threading to the bottom of blind holes where a bottoming chamfer would be necessary for full thread formation.

High speed steel with bright finish

The uncoated high speed steel construction provides good wear resistance in steel and non-ferrous materials while allowing easy resharpening. Two straight flutes and a bright finish mean chips are pushed ahead of the tap, requiring periodic withdrawal to clear chips in deeper through holes.

Highlights

  • Creates clean threads in through-holes with 5/16"-18 UNC sizing
  • Spiral point design pushes chips forward for smoother tapping
  • Two-flute high-speed steel construction resists wear during use
  • Right-hand cutting orientation matches standard threading requirements
  • Bright uncoated finish suits general-purpose metalworking applications

Specifications

BrandCLEVELAND
TypeTaps

Questions about this item

What thread size and pitch does the 57149 tap cut?

The 57149 tap cuts a 5/16 inch diameter thread with 18 threads per inch in the UNC standard.

How deep can I thread a hole with the 11/16 inch thread length?

The 11/16 inch thread length limits the full-form threads to that depth; deeper holes need a bottoming tap after this plug tap.

What does the H3 class of fit mean for the finished thread?

The H3 class of fit provides a standard tolerance allowance for general-purpose fastening with a 75 percent thread engagement.

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