Guhring - 1/4-28 UNF, 3 Flute, 40° Helix, Modified Bottoming Chamfer, TiN Finish, Cobalt Spiral Flute STI Tap - Right Hand Flute, 2.72" OAL, 0.272" Shank Diam, 3B Class of Fit, Series 3989
Item #: 07042898
Brand: Guhring
Model #: 9039890063500
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.
Titanium Nitride (TiN) is a multi-purpose coating which increases chip flow in softer materials. The heat and hardness resistance allows the tool to run at higher speeds than uncoated tools.
| Product Specifications | |
|---|---|
| Thread Size (Inch) | 1/4-28 |
| Class of Fit | 3B |
| Number of Flutes | 3 |
| Chamfer | Modified Bottoming |
| Finish/Coating | TiN |
| Overall Length (Decimal Inch) | 2.7200 |
| Helix Angle | 40 |
| Thread Standard | UNF |
| Material | Cobalt |
| Flute Direction | Right Hand |
| Series/List | 3989 |
| Shank Diameter (Decimal Inch) | 0.2720 |
| Material Application | Alloyed Steel; Unalloyed Steel |
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