| Manufacturer Part Number | SI422 |
| Thread Size (Inch) | 1/4" |
| Thread Size (Decimal Inch) | 0.250" |
| Thread Size (mm) | 6.35mm |
| Threads per Inch (TPI) | 28 |
| Thread Series | UNF |
| Pitch Limit | 2B |
| Chamfer Type | Plug |
| Chamfer Length | 4P-5P |
| Overall Length (Decimal Inch) | 2.720" |
| Overall Length (mm) | 69.09mm |
| Thread Length (Decimal Inch) | 0.472" |
| Thread Length (mm) | 11.99mm |
| Square Length (Decimal Inch) | 0.380" |
| Square Length (mm) | 9.65mm |
| Shank Diameter (Decimal Inch) | 0.318" |
| Shank Diameter (mm) | 8.08mm |
| Square Size (Decimal Inch) | 0.238" |
| Square Size (mm) | 6.05mm |
| Neck Diameter (Decimal Inch) | 0.234" |
| Neck Diameter (mm) | 5.94mm |
| Drill Size (Decimal Inch) | 0.260" |
| Drill Size (mm) | 6.60mm |
| Connection Size (Decimal Inch) | 0.318" x 0.238" |
| Connection Size (mm) | 8.08 x 6.05mm |
| Usable Length (Decimal Inch) | 1.130" |
| Usable Length (mm) | 28.70mm |
| Length / Diameter | 2.5 x D |
| Number of Flutes | 3 |
| Coating | Hardslick |
| Material | HSS-E |
| Blank Standard | 322 |
| Series | SI |
| Product Type | Spiral Point Tap |
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