Cle-Line
Cle-Line C00801 Spiral Point Tap 1/2-20 UNF H3
Creates precise UNF threads in through-holes using a 3-flute high-speed steel design with H3 limits
- Cuts internal threads in through-holes with spiral-point design
- 1/2-20 UNF thread size matches standard fine-pitch fasteners
- H3 thread limit fits class 3B tolerance requirements
- High-speed steel construction resists wear during repeated use
- Bright uncoated finish suits general-purpose tapping applications
Cle-Line C00801 Spiral Point Tap
This Cle-Line C00801 spiral point tap cuts 1/2-20 UNF internal threads in through-hole applications. It suits machinists and maintenance technicians who need reliable thread production in steel and similar materials. The H3 thread limit targets a 3B class of fit for standard precision requirements. Right-hand cutting direction matches common tooling setups.
UNF thread standard practical limits
The 1/2-20 UNF fine-pitch series provides stronger threads than coarse equivalents but demands accurate 11.40 mm drill size for 75 percent thread engagement. Spiral point geometry pushes chips ahead of the tap, reducing torque in through holes but making it unsuitable for blind holes where chips cannot escape. Bright uncoated high-speed steel performs well in low-alloy steels but wears faster in abrasive or hardened workpieces.
Installation and common issues
The 3 3/8 inch overall length and 1 21/32 inch thread length fit standard tap holders and CNC tool changers. Three flutes balance chip clearance and core strength during tapping. Misalignment during entry, incorrect drill diameter, or insufficient lubrication typically cause oversize threads, tap breakage, or poor surface finish. Proper speed selection for the workpiece material prevents premature wear.
Highlights
- Cuts internal threads in through-holes with spiral-point design
- 1/2-20 UNF thread size matches standard fine-pitch fasteners
- H3 thread limit fits class 3B tolerance requirements
- High-speed steel construction resists wear during repeated use
- Bright uncoated finish suits general-purpose tapping applications
Specifications
| Brand | CLE-LINE |
|---|
Questions about this item
Should I choose a different thread limit than H3 for a standard 1/2-20 UNF internal thread?
The H3 limit matches a Class 3B fit, which is the standard precision for a 1/2-20 UNF internal thread in general-purpose work.
What does the 75 percent thread drill size of 11.40 mm mean when I am tapping a hole?
Drill the hole to 11.40 mm before tapping; this diameter produces roughly 75 percent thread height, balancing cutting torque and thread strength in most materials.
How does the spiral point design affect chip flow on a through-hole?
The spiral point pushes chips ahead of the tap, making it suitable for through-holes up to the 1 21/32 in thread length without chip packing.
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