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Spiral flute tap with black oxide finish and three flutes

Widia Gtd

Widia Gtd VTSFT-TC5148 Spiral Flute Tap 1/4"-28 UNJF 2 Flutes

SKU CH-VAKH-K7TGK

Cuts 1/4"-28 UNJF threads with a three-flute spiral design for efficient chip evacuation

  • Spiral flute design clears chips efficiently in blind holes
  • High-speed steel construction resists wear during repeated threading operations
  • UNJF 1/4"-28 thread form meets aerospace fastener standards
  • 45 mm drill size ensures proper 75 percent thread engagement
  • Black oxide finish reduces friction and prevents galling

Thread Size and Pitch

The Widia Gtd VTSFT-TC5148 is a spiral flute tap designed for cutting internal threads. It handles a 1/4"-28 UNJF thread specification with a right-hand thread direction. This tool suits machinists and maintenance technicians who need precise threading in unified fine profiles.

Sustained Cutting Behaviour

The spiral flute geometry evacuates chips away from the cutting zone during deeper passes. High-speed steel construction with a black oxide finish resists wear when the tap remains engaged through the full 5/8 in thread length. The H3 thread limit and 3B class of fit maintain consistent tolerance across repeated holes.

Upgrade Context

This tap replaces straight-flute or worn spiral-flute tools that struggle with chip packing in blind holes. The jump is worth it when thread quality in unified fine sizes must meet 3B fit without rework. Buyers who need left-hand threads or larger diameters should select a different tool.

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 nameWIDIA

Questions about this item

Does the 75 percent thread drill size of 5.45 mm affect heat buildup during extended tapping?

The 5.45 mm drill size leaves adequate chip clearance for the three spiral flutes to evacuate material, reducing friction and heat during continuous use.

What holder or machine spindle is required for the 1/4"-28 UNJF shank?

A standard ER collet or tapping chuck sized for a 1/4 inch shank will secure the tap in a drill press, milling machine or CNC spindle.

Will the H3 thread limit and 3B class of fit match threads cut by older UNF taps?

Yes, the H3 limit and 3B fit produce a standard UNJF thread profile compatible with existing UNF fasteners and gauges.

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