Vermont Tap & Die - 1/4-20 UNC 3 Flute 2/3B Modified Bottoming Spiral Flute Tap - Powdered Metal, Oxide Finish, 2-1/2" OAL, Right Hand Flute, Right Hand Thread, H3, Series 5750SM
Item #: 68780337
Brand: Vermont Tap & Die
Model #: 330466
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.
Powdered Metal (PM) is tougher and more cost effective than solid carbide. It is commonly used on highly abrasive materials including high silicon aluminums.
Oxide, also known as black oxide or steam oxide, is a surface treatment that prevents chip building, galling and welding on the workpiece. It is commonly used on low carbons, stainless steel and ferrous metals.
Fast Spiral Flutes with 40-53 degree angles are suitable for ductile materials like aluminum and copper; medium to high carbon steels and free machining stainless steels.
| Product Specifications | |
|---|---|
| Thread Size (Inch) | 1/4-20 |
| Chamfer | Modified Bottoming |
| Class of Fit | 2/3B |
| Thread Limit | H3 |
| Number of Flutes | 3 |
| Material | Powdered Metal |
| Finish/Coating | Oxide |
| Thread Direction | Right Hand |
| Flute Direction | Right Hand |
| Through Coolant | NonThrough Coolant |
| Overall Length (Decimal Inch) | 2.5000 |
| Overall Length (Inch) | 2-1/2 |
| Overall Length (mm) | 63.50 |
| Helix Angle | 40 |
| Thread Standard | UNC |
| Material Grade | PMM4 |
| Oversize | No |
| Thread Length (Decimal Inch) | 0.6250 |
| Thread Length (Inch) | 5/8 |
| Thread Length (mm) | 15.88 |
| Flute Type | Fast Spiral |
| Series/List | 5750SM |
| Tapping Depth (Decimal Inch) | 1.0000 |
| Shank Diameter (Decimal Inch) | 0.2550 |
| Shank Diameter (mm) | 6.48 |
| Square Length (Inch) | 5/16 |
| Material Application | Alloy Steel; Carbon Steel; Cast Iron; Cobalt Alloys; Ferrous Alloys; Nickel Alloys; Stainless Steel; Tool Steel |
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