Greenfield Threading
Greenfield Threading Spiral Point Tap 280355 3 Flutes
A spiral-point tap cuts 1/4-20 UNC threads in through-holes using three high-speed steel flutes with TiN coating
- Cuts threads efficiently with spiral-point design
- Handles 1/4-20 UNC threads in right-hand orientation
- High-speed steel with TiN coating resists wear
- Three flutes clear chips for smoother tapping
- Manufactured by CHICAGO-LATROBE under model 280355
Spiral Point Tap for UNC Threads
This CHICAGO-LATROBE spiral point tap cuts 1/4 In. -20 UNC threads with a right-hand orientation. The high-speed steel body features a TiN coating for extended wear resistance. Three flutes provide efficient chip evacuation through the hole ahead of the cutting face. It is designed for through-hole applications in general-purpose machining.
Replaces Worn or Undersized Taps
A new tap restores thread accuracy when an existing tool produces oversized or rough threads. The H5 thread limit and 2B-3B class of fit suit standard production tolerances. The jump is worth it when thread gauge readings drift out of specification or when cycle times increase due to poor chip clearance. The 5/8 in thread length matches standard engagement depths for this size.
Verify Drill Size and Machine Setup
Confirm the workpiece is drilled to a #7 drill size to achieve the required 75 percent thread engagement. Ensure the machine spindle runs in the correct right-hand direction and that the holder accommodates the 2 1/2 in overall length. Check that the material being tapped is compatible with high-speed steel cutting geometry before ordering.
Highlights
- Cuts threads efficiently with spiral-point design
- Handles 1/4-20 UNC threads in right-hand orientation
- High-speed steel with TiN coating resists wear
- Three flutes clear chips for smoother tapping
- Manufactured by CHICAGO-LATROBE under model 280355
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
What size drill bit is required for the 1/4-20 UNC tap?
The tap requires a #7 drill bit to produce the 75 percent thread depth specified for this thread size.
How is the spiral point tap installed and what step is commonly missed?
Clamp the workpiece, align the tap perpendicular to the hole, and apply steady forward pressure with cutting fluid; the step often missed is reversing the tap frequently to break chips.
When should the tap be replaced?
Replace the tap when the cutting edges show visible wear, thread quality degrades, or the TiN coating has worn away on the flutes.
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