Cleveland
Cleveland C58440 Spiral Flute Tap 3
A spiral-flute tap cuts 1/4-inch UNC threads in through-holes, ejecting chips upward for cleaner results
- TypeTaps
- Right-hand threads cut standard fasteners
- Spiral flutes evacuate chips from blind holes
- High-speed steel resists wear in steel
- Black oxide coating reduces galling
- Three flutes balance strength and chip clearance
Thread Cutting Tool for 1/4‑20 UNC
The Cleveland C58440 is a spiral flute tap designed to cut 1/4‑20 UNC threads in through‑hole or blind‑hole applications. Machinists and maintenance technicians use it to produce clean, accurate internal threads in steel and alloy workpieces. The plug chamfer starts easily and runs true in standard tapping holders.
High‑Speed Steel with Black Oxide
High‑speed steel construction resists wear while the black oxide finish reduces galling and improves lubricant retention. Three flutes evacuate chips ahead of the cut, lowering torque and extending tool life in repetitive operations. The H3 thread limit delivers a class 2B fit without additional adjustment.
Right‑Hand Cutting with 5/8 Inch Thread Length
Right‑hand helix pulls chips out of deep holes, preventing packing in blind‑hole work. A 2‑1/2 inch overall length fits most tap wrenches and CNC tool changers. The #7 drill size prepares the correct 75 percent thread depth for reliable engagement.
Highlights
- Right-hand threads cut standard fasteners
- Spiral flutes evacuate chips from blind holes
- High-speed steel resists wear in steel
- Black oxide coating reduces galling
- Three flutes balance strength and chip clearance
Specifications
| Brand | CLEVELAND |
|---|---|
| Type | Taps |
Questions about this item
When will the H3 thread limit on this 1/4-20 UNC tap require replacement?
Replace the tap when thread gauges show the H3 limit is exceeded or when flutes wear enough to produce oversize or rough threads in the 2B class of fit.
What limits continuous threading with this high-speed steel spiral-flute tap?
Heat buildup in the workpiece and tap is the first limit; use cutting fluid and reduce speed to avoid premature wear on the three flutes.
How much heat does the black-oxide coating generate during all-day tapping?
The coating itself adds negligible heat; temperature rise comes from cutting friction, so maintain lubrication and proper RPM to keep the tap and part cool.
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