Walter-Prototyp - 1/4-18 NPTF, 15° Helix, 4 Flutes, Modified Bottoming Chamfer, Oxide Finish, Cobalt, Spiral Flute Pipe Tap - Right Hand Flute, 9/16" Shank Diam, 0.787" Thread Length, 7/16" Square Size, Series A264602
Item #: 36329894
Brand: Walter-Prototyp
Model #: 5081185
Exact Tooling IR#: 04
Features and Benefits
NPTF (National Pipe Taper Fuel) refers to Dryseal American National Standard Tapered Pipe Threads. They do not require a sealant due to being formed by metal to metal contact.
Cobalt is harder than high speed steel and provides better wear resistance. It is commonly used on high tensile alloys.
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.
Modified bottoming chamfers are similar to bottoming chamfers, but they are longer and have more teeth. They are used for threading to the bottom of blind holes and have 2 to 2-1/2 threads.
| Product Specifications | |
|---|---|
| Thread Size (Inch) | 1/4-18 |
| Thread Standard | NPTF |
| Material | Cobalt |
| Finish/Coating | Oxide |
| Number of Flutes | 4 |
| Helix Angle | 15 |
| Material Grade | M35 |
| Thread Length (Decimal Inch) | 0.7870 |
| Series/List | A264602 |
| Shank Diameter (Decimal Inch) | 0.5630 |
| Square Length (Inch) | 7/16 |
| Square Size (Decimal Inch) | 0.4210 |
| Material Application | Aluminum; Fiber Reinforced Plastics; Graphite; Grey Cast Iron; Malleable Cast Iron; Non-Ferrous Metals; Plastics; Spheroidal Cast Iron; Vermicular Cast Iron |
| Flute Direction | Right Hand |
| Chamfer | Modified Bottoming |
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