Greenfield Threading
Greenfield Threading Spiral Point Tap Plug 282256 3 Flutes #10-32 UNF HSS
Spiral-point tap cuts #10-32 UNF threads with three flutes for efficient chip ejection in through-holes
- Spiral point pushes chips ahead for cleaner #10-32 threads
- Three flutes balance strength and chip clearance in high-speed steel
- Plug chamfer starts easily in through holes
- Bright finish resists galling on uncoated surfaces
- H3 limit matches 2B class fit with #21 drill
Spiral Point Tap #10-32 UNF
This spiral point tap cuts #10-32 UNF threads in through-holes and deep blind holes. Its three-flute high-speed steel design pushes chips forward, reducing clogging and torque. The H3 thread limit produces a 2B class of fit for general-purpose fastening. Right-hand cutting suits standard thread direction.
Practical limits of UNF fine threads
The UNF fine pitch requires a #21 drill at 75 percent thread depth for proper engagement. Spiral point geometry works best in through-holes or blind holes with enough clearance for chips to exit ahead of the tap. High-speed steel bright finish performs well in mild steel and aluminium but wears faster in hardened alloys. Lubrication is essential to maintain thread quality and tool life.
Replaces worn or undersized taps
This tap replaces dull, chipped or incorrect-limit taps that produce loose or oversized threads. The jump is worth it when existing tools no longer hold the 2B tolerance or when chip evacuation becomes a bottleneck. Builders needing coarse-thread UNC or metric sizes must select a different tap. Left-hand thread applications also require a separate tool.
Highlights
- Spiral point pushes chips ahead for cleaner #10-32 threads
- Three flutes balance strength and chip clearance in high-speed steel
- Plug chamfer starts easily in through holes
- Bright finish resists galling on uncoated surfaces
- H3 limit matches 2B class fit with #21 drill
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
Should I pick the #10-32 UNF tap or a different thread size?
Choose the #10-32 UNF tap when you need a fine-pitch thread for a #10 screw; other sizes are for different bolt diameters.
What does the H3 thread limit mean once the tap is in the machine?
H3 sets the pitch-diameter tolerance so the finished thread meets a 2B class of fit for standard assembly.
How does the spiral-point design affect chip flow in a through hole?
The spiral point pushes chips ahead of the tap, making it suited for through-hole tapping in steel or aluminium.
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