Cleveland
Cleveland C27702 Spiral Point Tap 5/16-18 UNC 3 Flutes Cobalt Black Oxide
Cobalt spiral-point tap cuts 5/16-18 UNC threads with three flutes and black oxide finish
- Spiral-point design pushes chips ahead for smoother tapping in through-holes
- Cobalt steel with black oxide finish resists wear and heat in tough materials
- 5/16-18 UNC thread size matches standard coarse-pitch fastener requirements
- Three-flute geometry balances chip clearance and cutting strength
- H3 thread limit and 2B class of fit deliver consistent, accurate threads
Cleveland C27702 Spiral Point Tap
The Cleveland C27702 is a spiral point tap designed for cutting 5/16-18 UNC threads in through holes. Its cobalt construction and black oxide finish provide wear resistance for general-purpose metalworking tasks. The tool suits machinists and maintenance technicians who need reliable thread production in steel and similar materials.
Thermals noise and power draw
As a hand-operated or machine-driven cutting tool, the tap generates heat only at the cutting interface during use. Coolant or cutting oil manages temperature and chip evacuation effectively. No electrical power draw or acoustic noise rating applies to this non-powered accessory.
Build quality and connectors
The cobalt substrate with black oxide coating resists galling and extends service life in ferrous alloys. Three flutes and a spiral point push chips ahead of the cut, reducing torque and preventing flute clogging in through-hole applications. The H3 thread limit and 2B class of fit produce standard-compliant threads for general assembly. The 11/16 inch thread length and 2 23/32 inch overall length suit common tapping depths. Users requiring bottoming taps for blind holes or different thread forms will need separate tooling.
Highlights
- Spiral-point design pushes chips ahead for smoother tapping in through-holes
- Cobalt steel with black oxide finish resists wear and heat in tough materials
- 5/16-18 UNC thread size matches standard coarse-pitch fastener requirements
- Three-flute geometry balances chip clearance and cutting strength
- H3 thread limit and 2B class of fit deliver consistent, accurate threads
Specifications
| Brand | CLEVELAND |
|---|
Questions about this item
How do I install the Cleveland C27702 spiral point tap and what step do people often get wrong?
Use a drill size F hole to achieve the 75 percent thread depth before tapping. The common mistake is drilling the wrong diameter, which prevents the H3 limit tap from cutting a proper 2B class fit.
What maintenance or replacement will the Cleveland C27702 tap need over time?
The cobalt construction with black oxide finish resists wear, but the cutting edges on the three flutes will eventually dull. Replace the tap when thread quality degrades or cutting torque increases noticeably.
What limit shows up first when using the Cleveland C27702 tap under sustained production?
The H3 thread limit and 2B class of fit define the tolerance envelope. In high-volume use, the 11/16 inch thread length and cobalt substrate heat buildup become the practical limiting factors before the tap reaches its dimensional limit.
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