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Spiral flute tap, 1/4"-28, high speed steel, black oxide finish

Widia Gtd

Widia Gtd VTSFT-TC5149 Spiral Flute Tap 1/4"-28 pneumatic accessory

SKU CH-FW7X-1SSQ0

Creates precise UNF threads in 1/4"-28 holes using a three-flute spiral flute tap made from high-speed steel with black oxide finish

  • Spiral flute design clears chips efficiently in blind holes
  • 1/4"-28 UNF thread size matches standard fastener specifications
  • High-speed steel construction with black oxide resists wear during tapping
  • Three flutes provide balanced cutting action for accurate threads
  • H5 thread limit ensures proper 2B class fit for reliable assembly

1/4"-28 UNF Spiral Flute Tap

This Widia Gtd spiral flute tap cuts 1/4"-28 UNF threads in a single pass. The high-speed steel body with black oxide finish handles general-purpose threading tasks. Right-hand thread direction suits standard fasteners. Three flutes provide chip evacuation for through-hole and blind-hole work.

Replaces Worn Or Damaged 1/4"-28 Taps

Switch to this tap when an existing tool shows chipped flutes, excessive wear or produces oversize threads. The H5 thread limit and 2B class of fit restore correct pitch diameter control. A 5.45 mm drill size prepares holes for 75 percent thread engagement. The jump is worth it when thread gauge readings fall outside tolerance.

Straightforward Install In Standard Holders

The 2 1/2 inch overall length fits common tap wrenches and CNC tool holders without adapters. Chamfer the hole entrance to prevent cross-threading on entry. Use cutting fluid matched to the workpiece material to avoid built-up edge on the flutes. Over-speeding or insufficient lubrication typically causes premature flute wear or tap breakage.

Highlights

  • Spiral flute design clears chips efficiently in blind holes
  • 1/4"-28 UNF thread size matches standard fastener specifications
  • High-speed steel construction with black oxide resists wear during tapping
  • Three flutes provide balanced cutting action for accurate threads
  • H5 thread limit ensures proper 2B class fit for reliable assembly

Specifications

BrandWIDIA

Questions about this item

What is the 75 percent thread drill size for the 1/4"-28 spiral flute tap?

The 75 percent thread drill size is 5.45 mm for this 1/4"-28 UNF tap.

How is the Widia VTSFT-TC5149 tap installed, and what step is often missed?

Mount the tap in a suitable holder, apply cutting fluid, and start square to the hole; the step often missed is verifying alignment before applying full pressure.

When does the black oxide high-speed steel tap need replacement?

Replace the tap when the three flutes show wear, threads gauge out of 2B tolerance, or cutting performance drops noticeably.

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