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Widia Gtd spiral flute tap 7/16-14 bottoming 2 flutes UNJC high speed steel black oxide finish

Widia Gtd

Widia Gtd VTSFT-TC5160 Spiral Flute Tap 7/16"-14 Bottoming 2 Flutes UNJC

SKU CH-65TF-3XX5K

Spiral-flute tap cuts 7/16"-14 UNJC threads in blind holes with a bottoming chamfer

  • Spiral flute design clears chips efficiently in blind holes
  • 7/16"-14 UNJC thread size fits specific aerospace fasteners
  • Bottoming chamfer cuts full threads to hole bottom
  • High-speed steel construction resists wear during tapping
  • Three flutes provide balanced cutting and chip evacuation

Widia Gtd Spiral Flute Tap 7/16"-14

The Widia Gtd VTSFT-TC5160 is a spiral flute tap designed for creating internal threads in metal components. It suits machinists and maintenance technicians who require reliable thread production in through-hole or blind-hole applications. The UNJC thread form meets controlled-radius root specifications for high-stress fastening. This tool targets professional workshops handling aerospace or automotive repair work.

High-speed steel construction

High-speed steel construction provides wear resistance during repeated threading operations. The black oxide surface treatment helps retain cutting lubricant and reduces galling on the workpiece. A 7/8 in thread length and 3 5/32 in overall length allow access to standard-depth holes. Right-hand thread direction matches common fastener requirements for assembly tasks.

75 percent thread drill size U and H5 thread limit

The H5 thread limit and Class of Fit 2B ensure consistent thread geometry for gauge verification. A 75 percent thread drill size U guides drill selection without separate lookup tables. Three flutes improve chip evacuation compared to two-flute designs, reducing tap breakage risk. California Proposition 65 notice applies due to chemical content in the coating.

How it compares

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

Price $41.99
Pricier than about 62% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameWIDIA

Questions about this item

What thread standard does the UNJC 7/16"-14 tap follow?

This tap cuts Unified National "J" Coarse threads with a 7/16 inch major diameter and 14 threads per inch, to a Class 2B fit.

What are the overall length and thread length of this tap?

Overall length is 3 5/32 inches and the threaded portion is 7/8 inch long.

How do I choose the correct drill bit for this tap?

Use a size U drill to produce the recommended 75 percent thread engagement before tapping.

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