OSG - 1/4-20 UNC 3 Flute H3 Bright Finish High Speed Steel Spiral Flute Extension Tap - Plug Chamfer, 4" OAL, 3B Class of Fit
Item #: 64163702
Brand: OSG
Model #: 1297800
Exact Tooling IR#: 04
Features and Benefits
Plug chamfers are the most commonly used chamfer and are designed for efficiently threading through and blind holes. They have 3 to 5 threads.
Spiral flute taps are used for threading blind holes in aluminum, brass and softer steels. The flute geometry draws the chips away from the hole where chip disposal may be an issue.
Bright provides a smooth, polished finish on the tool. It increases chip flow in softer materials such as aluminum, wood and plastic.
High Speed Steel (HSS) provides good wear-resistance and can be used in general purpose applications for both ferrous and nonferrous materials.
| Product Specifications | |
|---|---|
| Thread Size | 1/4-20 |
| Overall Length (Inch) | 4 |
| Overall Length (Decimal Inch) | 4.000 |
| Chamfer | Plug |
| Thread Limit | H3 |
| Class of Fit | 3B |
| Number of Flutes | 3 |
| Tap Type | Spiral Flute |
| Finish/Coating | Bright |
| Flute Direction | Right Hand |
| Thread Standard | UNC |
| Material | High Speed Steel |
| Thread Length (Inch) | 1 |
| Thread Direction | Right Hand |
| Helix Angle | 50 |
| Shank Diameter (Decimal Inch) | 0.2550 |
| Square Size (Decimal Inch) | 0.1910 |
| Material Application | Aluminum; Carbon Steel; Cast Iron |
| Neck Length (Decimal Inch) | 1.0070 |
| Shank Size Type | Reduced |
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