Walter-Prototyp - 1/4-28 UNF, 3 Flute, 15° Helix, Modified Bottoming Chamfer, Bright Finish, Powdered Metal Spiral Flute STI Tap - Right Hand Flute, 3.5433" OAL, 0.315" Shank Diam, 0.7087" Thread Length, 3B Class of Fit, Series 234069
Item #: 53063251
Brand: Walter-Prototyp
Model #: 5078570
Exact Tooling IR#: 04
Features and Benefits
Modified bottoming chamfers are similar to bottoming chamfers, but they are longer and have more teeth. They are used for threading blind holes and have 2 to 2-1/2 threads.
Bright provides a smooth, polished finish on the tool. It increases chip flow in softer materials such as aluminum, wood and plastic.
| Product Specifications | |
|---|---|
| Thread Size (Inch) | 1/4-28 |
| Class of Fit | 3B |
| Number of Flutes | 3 |
| Chamfer | Modified Bottoming |
| Finish/Coating | Bright |
| Overall Length (Decimal Inch) | 3.5433 |
| Overall Length (mm) | 90.00 |
| Helix Angle | 15 |
| Thread Standard | UNF |
| Material | Powdered Metal |
| Flute Direction | Right Hand |
| Thread Length (Decimal Inch) | 0.7087 |
| Thread Length (mm) | 18.00 |
| Series/List | 234069 |
| Shank Diameter (Decimal Inch) | 0.3150 |
| Shank Diameter (mm) | 8.00 |
| Material Application | Aluminum; Cast Steel; Cobalt Alloys; Iron Alloys; Nickel Alloys; Non-Ferrous Metals; Steel; Titanium; Titanium Alloys |
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