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Spiral flute tap with steam oxide finish, three flutes, bottoming style

Westward

Westward 5TWT3 Spiral Flute Tap 1/2"-13 UNC Bottoming 3 Flutes Steam Oxide

SKU CH-YTPJ-J4TVH

Creates precise UNC threads in 1/2"-13 holes with three spiral flutes that clear chips efficiently and a steam-oxide finish for wear resistance

  • Product typeKnives, Cutters & Snips
  • Bottoming chamfer starts threads in blind holes
  • Spiral flutes pull chips out of deep cuts
  • Cobalt steel resists wear in tough materials
  • Steam oxide coating reduces friction and galling
  • Three-flute design balances strength and chip clearance

1/2"-13 UNC Bottoming Tap

The Westward 5TWT3 is a spiral-flute tap for cutting right-hand unified coarse threads in a 1/2"-13 size. Its cobalt construction and steam oxide finish resist wear during repeated threading operations. The bottoming chamfer allows threads to start close to the bottom of a blind hole. Three flutes provide balanced chip evacuation.

Suited for blind-hole threading

Machinists and maintenance technicians cutting internal threads in blind holes will benefit from the spiral-flute geometry that pulls chips upward. The H3 limit and 3B class of fit suit general-purpose production work. Builders needing a taper or plug chamfer for through-holes, or a different thread limit for tighter tolerances, should select an alternative tap.

Cobalt substrate with oxide coating

The cobalt material increases hardness and heat resistance compared with standard high-speed steel, extending tool life in tougher alloys. Steam oxide surface treatment reduces galling and improves lubricant retention during cutting. No additional accessories or software are included with this single cutting tool.

How it compares

Measured against everything we stock in Utility & Specialty Hand Tools, at today’s prices. Recalculated every night.

Price $29.99
Pricier than about 59% of the 2,474 comparable items (median $23.99).

Specifications

Product
Brand nameWestward
Product typeKnives, Cutters & Snips

Questions about this item

What thread size must the workpiece already have for this 1/2"-13 UNC tap to cut correctly?

The workpiece must be drilled to the 75 percent thread drill size of 0.4219 in. before tapping.

Will this bottoming tap with a 1 21/32 in. thread length reach full depth in a blind hole that is shorter than that?

No, a blind hole must be at least 1 21/32 in. deep to accommodate the full thread length.

How can I verify the tap is producing a Class 3B fit after setup?

Check the finished thread with a Class 3B go/no-go gauge; the go gauge should enter and the no-go gauge should stop.

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