Cleveland
Cleveland C55315 Spiral Point Tap 1/4-20 UNC HSS TiN 2 Flutes
Creates UNC threads in through-holes using high-speed steel with TiN coating
- TypeTaps
- Cuts threads efficiently with spiral point design
- Handles 1/4-20 UNC threads for standard applications
- Resists wear using High Speed Steel with TiN coating
- Two flutes clear chips for smoother tapping
- Right-hand threads suit common fastening needs
Cleveland C55315 Spiral Point Tap 1/4-20 UNC
This Cleveland C55315 spiral point tap cuts 1/4-20 UNC threads in through-holes. The high-speed steel body with TiN coating resists wear during production runs. A 2-1/2 inch overall length and 1 inch thread length suit standard tool holders. Two flutes push chips ahead of the cut for smooth tapping.
Suited for machine tapping of through-holes
Machinists who need a plug-chamfer tap for through-hole work will find the H2 limit and 2B class of fit match standard specs. The #7 drill size pairs with the 75 percent thread depth for reliable engagement. Shops that only tap blind holes or need bottoming chamfers should select a different tap style.
1/4-20 UNC thread size with H2 limit and 2B fit
The single specification that decides fit is the 1/4-20 UNC thread size combined with the H2 thread limit and 2B class of fit. Verify the workpiece material and hole type match a spiral-point plug tap before ordering.
Highlights
- Cuts threads efficiently with spiral point design
- Handles 1/4-20 UNC threads for standard applications
- Resists wear using High Speed Steel with TiN coating
- Two flutes clear chips for smoother tapping
- Right-hand threads suit common fastening needs
Specifications
| Brand | CLEVELAND |
|---|---|
| Type | Taps |
Questions about this item
How do I install the 1/4-20 UNC spiral point tap in a drill press, and what step is often missed?
Secure the tap in a floating holder, use a #7 drill for the 75 percent thread hole, apply cutting fluid, and start the machine at low speed; the step most often missed is reversing immediately after the 1 inch thread length to break chips cleanly.
When will the TiN coating on this HSS tap need replacement?
The TiN layer wears gradually; replace the tap when flank wear reaches the H2 limit or when thread gauging fails the 2B class of fit, typically after several thousand holes in steel.
What limit appears first during sustained tapping with this two-flute tool?
Chip evacuation in deep or blind holes becomes the limiting factor first, as the spiral point pushes chips ahead and the two flutes can pack, causing torque spikes and tap breakage.
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