Greenfield Threading
Greenfield Threading Spiral Point Tap Plug 357542 3 Flutes
A spiral-point tap cuts 3/8-16 UNC threads in through-holes using three flutes and a TiN-coated high-speed steel body
- Spiral point design clears chips forward for smoother tapping
- 3/8 in. -16 UNC thread size fits standard coarse applications
- High-speed steel with TiN coating resists wear and heat
- Three flutes balance strength and chip evacuation
- Right-hand cut with H5 limit suits 2B-3B class fits
Greenfield Threading Spiral Point Tap 357542
The Greenfield Threading Spiral Point Tap 357542 is a high-speed steel cutting tool with a titanium nitride coating for extended wear resistance. It produces UNC threads at 3/8 inch with 16 threads per inch and a right-hand orientation. The plug-chamfer design suits through-hole and deep blind-hole applications in general machine-shop work.
Upgrade from straight-flute taps for sticky
Spiral-point geometry pushes chips ahead of the cut, reducing torque and preventing flute clogging in ductile steels and aluminium alloys. The design change is worth it when thread quality drops or tap breakage rises on long production runs. Three flutes balance chip clearance with core strength for consistent performance.
Handles 75 percent thread depth in 0.3125 inch holes
The H5 thread limit targets a 2B-3B class of fit across a 1 1/4 inch thread length. Headroom exists for moderate batch work in medium-carbon steel before re-sharpening. The tap reaches its limit in high-silicon aluminium or hardened alloys where chip evacuation slows and cutting edges wear rapidly.
Highlights
- Spiral point design clears chips forward for smoother tapping
- 3/8 in. -16 UNC thread size fits standard coarse applications
- High-speed steel with TiN coating resists wear and heat
- Three flutes balance strength and chip evacuation
- Right-hand cut with H5 limit suits 2B-3B class fits
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
What drill size is required for the 3/8-16 UNC thread on this tap?
The 75 percent thread drill size is 0.3125 in, which is the recommended pilot hole for this thread specification.
How is the TiN coated high speed steel tap installed in a tapping holder?
Insert the square shank into a compatible tap wrench or CNC holder, align perpendicular to the workpiece, and advance with steady pressure; the spiral point pushes chips ahead to prevent binding.
When should this H5 limit tap be replaced during production threading?
Replace when thread gauging shows pitch diameter growth beyond the 2B-3B class of fit or when the TiN coating wears enough to increase torque and degrade finish.
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