Cleveland
Cleveland C86217 Spiral Point Tap Plug 3 5/16-24 UNF Cobalt Black Oxide
Cobalt spiral-point plug tap cuts 5/16-24 UNF threads with 3 flutes and black oxide finish
- Cuts clean threads in hard metal with cobalt construction
- Starts easily in through-holes using spiral point design
- Removes chips forward for smoother tapping with three flutes
- Matches UNF 5/16-24 spec with 2B class of fit
- Drills precisely with 75 percent thread drill size I
Cleveland C86217 Spiral Point Tap
The Cleveland C86217 is a spiral point tap designed for creating UNF threads in through-hole applications. It suits machinists and maintenance technicians who require reliable thread cutting in metal components. The plug chamfer allows easier starting and alignment during manual or machine operations. This tool is not for buyers who need a bottoming tap for blind holes.
Cobalt Construction with Black Oxide Finish
The cobalt substrate provides higher heat resistance and wear life compared to standard high-speed steel taps. Black oxide coating adds lubricity and corrosion protection during use. These attributes extend tool life in tougher alloys and reduce the risk of galling. This tap is not for users who require coated carbide for high-volume production.
5/16-24 UNF Thread Size with 3 Flutes
The tap cuts a 5/16 inch diameter thread with 24 threads per inch in a Unified National Fine series. Three flutes balance chip evacuation and core strength for general-purpose tapping. Thread limit 2B and class of fit 2B ensure standard tolerance for nut compatibility. This specification is not for applications requiring a different pitch, diameter or thread standard.
Highlights
- Cuts clean threads in hard metal with cobalt construction
- Starts easily in through-holes using spiral point design
- Removes chips forward for smoother tapping with three flutes
- Matches UNF 5/16-24 spec with 2B class of fit
- Drills precisely with 75 percent thread drill size I
Specifications
| Brand | CLEVELAND |
|---|
Questions about this item
Will the cobalt spiral point tap need resharpening or replacement after extended threading work?
Cobalt construction resists wear longer than high-speed steel, but the three-flute cutting edges will eventually dull and require professional resharpening or replacement.
What limit appears first during continuous tapping — thread depth or chip evacuation?
The 1 3/8 in thread length sets the maximum depth per pass, while the spiral point pushes chips ahead to reduce clogging in through-holes.
How much heat and cutting force build up when running this tap all day in steel?
Cobalt handles higher temperatures than standard taps, and the 75 percent thread drill size I lowers torque, reducing heat during prolonged use.
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