Product Description
UNC high speed steel spiral flute taps for creating internal Unified National Coarse threads, especially in blind hole tapping applications.
These UNC HSS spiral flute taps are designed with helical flutes that help pull chips and swarf back out of the hole towards the shank, opposite to the tapping direction. This makes them especially useful for blind holes, where chip evacuation is important for cleaner thread cutting and improved tap life compared with standard straight flute hand taps.
- Thread form: UNC / Unified National Coarse
- Material: High speed steel / HSS
- Flute type: Spiral flute / helical flute
- Use: Creating new internal threads
- Best suited for: Blind hole tapping
- Thread sizes available: 4-40 UNC through to 1"-8 UNC
- Chip direction: Pulls swarf back towards the tap shank
| Thread Size | TPI | Thread Form | Material | Flute Type | Best Use |
|---|---|---|---|---|---|
| 4-40 UNC | 40 | UNC | High Speed Steel | Spiral Flute | Blind Holes |
| 6-32 UNC | 32 | UNC | High Speed Steel | Spiral Flute | Blind Holes |
| 8-32 UNC | 32 | UNC | High Speed Steel | Spiral Flute | Blind Holes |
| 10-24 UNC | 24 | UNC | High Speed Steel | Spiral Flute | Blind Holes |
| 1/4"-20 UNC | 20 | UNC | High Speed Steel | Spiral Flute | Blind Holes |
| 5/16"-18 UNC | 18 | UNC | High Speed Steel | Spiral Flute | Blind Holes |
| 3/8"-16 UNC | 16 | UNC | High Speed Steel | Spiral Flute | Blind Holes |
| 7/16"-14 UNC | 14 | UNC | High Speed Steel | Spiral Flute | Blind Holes |
| 1/2"-13 UNC | 13 | UNC | High Speed Steel | Spiral Flute | Blind Holes |
| 9/16"-12 UNC | 12 | UNC | High Speed Steel | Spiral Flute | Blind Holes |
| 5/8"-11 UNC | 11 | UNC | High Speed Steel | Spiral Flute | Blind Holes |
| 3/4"-10 UNC | 10 | UNC | High Speed Steel | Spiral Flute | Blind Holes |
| 7/8"-9 UNC | 9 | UNC | High Speed Steel | Spiral Flute | Blind Holes |
| 1"-8 UNC | 8 | UNC | High Speed Steel | Spiral Flute | Blind Holes |
Please note: Specifications are intended as a guide only. If dimensions are critical to your project, please check with us before ordering.
