Widia Gtd
Widia Gtd VTSFT-TC5163 Spiral Flute Tap 1/2"-13 Bottoming 2 Flutes UNJC pneumatic accessory
A spiral-flute tap cuts 1/2"-13 UNJC threads to a bottoming depth using two flutes in high-speed steel with black-oxide finish
- Spiral flute clears chips in blind holes with 15/16 in thread length
- 1/2 in -13 UNC size matches standard coarse threads for common fasteners
- High-speed steel with black oxide resists wear during repetitive tapping
- Bottoming chamfer cuts full threads to the base of drilled holes
- Three flutes and H3 limit deliver class 3B fit for precise assembly
Thread-cutting tap for UNC 1/2"-13 holes
This spiral-flute tap cuts unified coarse threads in a 1/2 inch diameter with 13 threads per inch. It is made from high-speed steel with a black-oxide finish. The tool suits maintenance technicians and machinists who need to create internal threads in through-holes or blind holes. The right-hand thread direction matches standard fastener conventions.
Bottoming chamfer limits full-thread depth
The bottoming style has a short lead of only a few threads, so it cannot start a thread from the top of a deep blind hole. A taper or plug tap must begin the cut before this tool finishes to the bottom. The 75 percent thread drill size of 27/64 inch and H3 thread limit define the hole preparation required for a class 3B fit. The 15/16 inch thread length sets the maximum full-form engagement.
Three-flute geometry eases chip evacuation in most
The three flutes provide more chip space than two-flute designs, reducing the chance of binding when tapping steel or cast iron. Use a tapping fluid and keep the tap aligned with the hole axis to avoid breakage. The most common fault is drilling the hole too small or too large, which either overloads the tap or produces an undersize thread. California Proposition 65 warns that the product contains a chemical known to cause birth defects or other reproductive harm.
Highlights
- Spiral flute clears chips in blind holes with 15/16 in thread length
- 1/2 in -13 UNC size matches standard coarse threads for common fasteners
- High-speed steel with black oxide resists wear during repetitive tapping
- Bottoming chamfer cuts full threads to the base of drilled holes
- Three flutes and H3 limit deliver class 3B fit for precise assembly
Specifications
| Brand | WIDIA |
|---|
Questions about this item
Should I choose the 1/2"-13 UNJC tap or another size for my application?
Select the 1/2"-13 UNJC tap only when the drawing specifies that exact thread size and class of fit 3B; other diameters or pitch combinations will not produce the required thread form.
What does the 3 3/8 in overall length mean when the tap is in the machine?
The 3 3/8 in overall length determines how deep the holder can reach into the workpiece before the shank contacts the spindle, so verify your toolholder clearance matches this dimension.
How does the UNJC thread standard affect the tapping operation?
UNJC defines a controlled-root-radius external thread for high-fatigue applications; the tap cuts a matching internal thread to class 3B, so the drilled hole must be 27/64 in to achieve the 75 percent thread engagement specified.
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