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Spiral Flute (BLF) - UNF
HSS-EV Oxidised Finish
UNF - Unified National Fine
Bright Finish
Taper lead to DIN form C (3 x P)
Tapping tolerance to 6H
Manufactured to DIN 374
For shorter blind holes
| Dimensions Standard | DIN 374 |
| Tap Type | Spiral Flute |
| Tapping Depth | 15.8mm |
| Pitch | 28.0 |
| Thread Size | 1/4in |
| Thread Standard | UNF |
| Helix Angle | 45\u00b0 |
| Class of Fit | 2B |
| Material | Vanadium High Speed Steel |
| Material Grade | M35 |
| Teeth per Inch | 28 |
| Shank Diameter | 4.5mm |
| Overall Length | 80.0mm |
| Finish/Coating | Bright |
| Thread Direction | Right Hand |
| Square Width | 3.4mm |
| Thread Length | 17.0mm |
| Number of Flutes | 3 |
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