Cleveland
Cleveland C55328 Spiral Point Tap 7/16-14 UNC 3 Flutes
A spiral-point tap cuts 7/16‑14 UNC threads in a single pass, with three flutes and a TiN‑coated high‑speed steel body for longer life
- Spiral-point design pushes chips forward for smoother tapping in through-holes
- Three flutes balance chip clearance and cutting strength in 7/16-14 UNC threads
- High-speed steel with TiN coating resists wear and extends tool life
- Right-hand cut with H3 limit fits Class 2B threads for reliable engagement
- 75 % thread drill size U matches standard tapping drill charts
Cleveland C55328 Spiral Point Tap
The Cleveland C55328 is a spiral point tap designed for creating internal threads in through-hole applications. It features a 7/16-14 UNC thread size with a 3-flute high-speed steel construction and a titanium nitride coating. The plug chamfer and right-hand cut orientation suit general-purpose threading tasks. Overall length measures 3 5/32 inches with a thread length of 1 7/16 inches.
Suited for machinists cutting UNC threads in steel
This tap suits machinists and maintenance technicians producing Class 2B fit threads in through holes using high-speed steel tooling. The H3 thread limit and 75 percent thread drill size U requirement align with standard industrial specifications. It is not for blind-hole threading where chip evacuation differs, nor for left-hand thread requirements. Users needing different thread forms, limits, or flute counts should select an alternative tool.
Verify drill size and material compatibility
Before ordering, confirm the workpiece material is compatible with high-speed steel and TiN coating under your cutting parameters. Ensure the drilling operation produces the specified 75 percent thread drill size U to achieve the correct Class 2B fit. Check that the machine spindle rotates right-hand and can accommodate the 3 5/32 inch overall length. Verify the H3 thread limit matches the engineering drawing for the intended assembly.
Highlights
- Spiral-point design pushes chips forward for smoother tapping in through-holes
- Three flutes balance chip clearance and cutting strength in 7/16-14 UNC threads
- High-speed steel with TiN coating resists wear and extends tool life
- Right-hand cut with H3 limit fits Class 2B threads for reliable engagement
- 75 % thread drill size U matches standard tapping drill charts
Specifications
| Brand | CLEVELAND |
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Questions about this item
What size drill bit do I need before using the 7/16-14 tap?
Use a U drill bit to create the 75 percent thread hole before tapping.
Will the H3 thread limit still produce a 2B class of fit in an older threaded hole?
Yes, the H3 limit is designed to produce a standard 2B class of fit.
How can I confirm the tap is cutting correctly after setup?
Check that chips are pushed forward out of the hole by the spiral point design.
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