Greenfield Threading
Greenfield Threading 280603 Spiral Point Tap Plug 3 Flutes
Spiral point tap cuts 3/8 in.-16 UNC threads in through-holes with three flutes and a TiN-coated high-speed steel body
- Spiral-point design pushes chips forward for smoother tapping
- High-speed steel with TiN coating resists wear and heat
- 3/8‑16 UNC thread fits standard coarse‑thread applications
- Three flutes balance chip clearance and cutting strength
- H5 limit and 2B‑3B class ensure precise thread fit
Professional tapping tool
The CHICAGO-LATROBE 280603 spiral point tap is designed for machine threading of 3/8 inch UNC threads in through-hole applications. It suits metalworking professionals and maintenance technicians who require reliable thread production in steel and similar materials.
High-speed steel with TiN coating
The tap features a right-hand spiral point with three flutes that push chips ahead of the cut, reducing torque and preventing chip packing in the hole. A TiN coating increases surface hardness and wear resistance for extended tool life. The 75 percent thread drill size of 0.3125 inch and H5 thread limit target a 2B-3B class of fit.
Replaces worn or standard uncoated taps
This tool upgrades from basic high-speed steel taps when longer intervals between resharpening are needed. The jump is worthwhile for production runs where chip evacuation in through holes slows cycle times. It is not suited for blind-hole threading where chip removal direction differs.
Highlights
- Spiral-point design pushes chips forward for smoother tapping
- High-speed steel with TiN coating resists wear and heat
- 3/8‑16 UNC thread fits standard coarse‑thread applications
- Three flutes balance chip clearance and cutting strength
- H5 limit and 2B‑3B class ensure precise thread fit
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
What thread standard and size does the 280603 tap cut?
It cuts a 3/8 In. -16 UNC thread with a Class of Fit 2B-3B and Thread Limit H5.
What shank and drill size are needed to mount and prepare for this tap?
The 75 Percent Thread Drill Size is 0.3125 in; the tap has a 3/4 in thread length and 2 15/16 in overall length.
How do you install this spiral-point tap and what step is often missed?
Use a 0.3125 in drill for the 75 Percent Thread, then tap right-hand with cutting fluid; the step often missed is drilling to the exact 0.3125 in size for proper thread engagement.
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