Widia Gtd
Widia Gtd VTSFT-TC5158 Spiral Flute Tap 3/8"-24 Bottoming 2 Flutes UNJF
A spiral flute tap cuts UNF 3/8"-24 threads with a 3/4 inch thread length and H5 limit
- Spiral flute design clears chips efficiently in blind holes
- 3/8"-24 UNJF thread size fits precise aerospace fasteners
- Bottoming chamfer cuts threads close to hole bottom
- High-speed steel construction resists wear during repeated use
- Black oxide finish reduces friction and prevents galling
Widia Gtd 3/8"-24 UNJF Spiral Flute Tap
This tap cuts internal UNJF threads in a 3/8"-24 size using a spiral-flute design that evacuates chips ahead of the cut. It is made from high-speed steel with a black-oxide finish for wear resistance. The 2 15/16 in overall length and 3/4 in thread length suit standard tapping depths. It is intended for machinists and maintenance technicians producing Class 3B fits in ferrous and non-ferrous metals.
Bottoming-chamfer tap for blind-hole work
The bottoming chamfer lets the tool start threads close to the bottom of a blind hole where a taper or plug tap cannot reach. A 8.50 mm drill size prepares the correct 75 percent thread engagement before tapping. Right-hand thread direction matches the overwhelming majority of fastener applications. The H5 thread limit controls the pitch-diameter tolerance for the specified class of fit.
Replaces worn or undersized 3/8"-24 UNJF taps
When an existing tap no longer holds the H5 limit or produces oversize threads, this tool restores the correct Class 3B tolerance. The jump is worth it when thread gauges reject parts or when a new job requires the tighter UNJF aerospace profile rather than a standard UNF form. It is not suited for through-holes where a plug chamfer would clear chips more efficiently.
Highlights
- Spiral flute design clears chips efficiently in blind holes
- 3/8"-24 UNJF thread size fits precise aerospace fasteners
- Bottoming chamfer cuts threads close to hole bottom
- High-speed steel construction resists wear during repeated use
- Black oxide finish reduces friction and prevents galling
Specifications
| Brand | WIDIA |
|---|
Questions about this item
What thread limit does the VTSFT-TC5158 tap use and how does that affect the maximum hole size I can tap?
The H5 thread limit provides an oversize pitch diameter allowance for 3B class of fit in unified threads, matching the 3/8-24 UNJF specification
How much heat builds up in the high-speed steel body during extended production runs with this spiral flute design?
High-speed steel construction with black oxide coating resists thermal softening while the 3-flute spiral geometry evacuates chips efficiently to reduce frictional heat buildup
Which tap holder or collet size do I need to run the 3/8-24 VTSFT-TC5158 in my CNC machine?
The tap shank follows standard unified dimensions for 3/8 inch nominal size, compatible with ER collets or quick-change holders sized for 3/8 UNJF tooling
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