Greenfield Threading
Greenfield Threading Spiral Point Tap 357088 pneumatic accessory
Spiral point tap cuts 1/4-20 UNC threads in 2-1/2 inch overall length with three flutes and TiN coating
- Spiral-point design pushes chips forward for smoother threading
- 1/4"-20 UNC thread size fits standard coarse-pitch holes
- High-speed steel with TiN coating resists wear during repeated cuts
- Three-flute plug tap clears material efficiently in through-holes
- H3 thread limit and 2B class of fit ensure accurate engagement
Spiral Point Tap 357088
The CHICAGO-LATROBE 357088 is a high-speed steel spiral point tap designed for through-hole threading in unified coarse threads. It features a TiN coating to extend tool life and reduce friction during cutting operations. This accessory suits maintenance technicians and machinists creating new internal threads or repairing existing ones in metal workpieces.
Replaces worn or undersized taps
A fresh tap restores clean thread profiles when an old tool produces oversized, rough or misaligned threads that compromise fastener holding power. The upgrade is worth it when thread gauge checks show limit violations or when tapping torque rises sharply due to dulled flutes. The plug chamfer and three-flute design suit general-purpose through-hole work in steel and non-ferrous metals.
Limited to UNC 1/4-20 through holes
This tap cuts only unified coarse threads at the stated diameter and pitch, so it cannot produce metric, fine-pitch or pipe threads. The overall length and thread length restrict reach to holes no deeper than the cutting portion allows. TiN coating improves wear resistance but does not enable use on hardened materials beyond the substrate capability. Blind-hole applications require a bottoming or taper tap instead.
Highlights
- Spiral-point design pushes chips forward for smoother threading
- 1/4"-20 UNC thread size fits standard coarse-pitch holes
- High-speed steel with TiN coating resists wear during repeated cuts
- Three-flute plug tap clears material efficiently in through-holes
- H3 thread limit and 2B class of fit ensure accurate engagement
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
What drill size is required for the 1/4-20 UNC thread?
Use a #7 drill to produce the 75 percent thread depth specified for this tap.
How should the spiral-point tap be started to avoid cross-threading?
Align the tap squarely with the hole, apply steady pressure, and let the spiral point push chips ahead without forcing the first threads.
When does the TiN-coated high-speed steel tap need replacement?
Replace it when the cutting edges dull, chip clearance drops, or thread gauges show the 2B class of fit is no longer met.
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