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Dormer EX31 1/4 - 28 HSS-E-PM Machine Tap
Order Code
TDG-05306M
£34.09 £28.41
Incl. VAT Ex. VAT
Dormer EX31 1/4 - 28 HSS-E-PM Machine Tap is only available to buy in quantities of 1
Product Information
Spiral flute machine tap with chamfer form C with a 2-3xP semi-bottoming lead, for Unified National Fine thread UNF 1/4in with 28 TPI and 2B class of fit, dimensions according to DIN 2184-1 standard with 7.0mm shank and 5.5mm square drive, powder metallurgical HSS-E with uncoated surface finish and 45° helix angle for 2.5xD blind hole threading in alloy steel.
Technical Specification
| Brand | Dormer |
|---|---|
| Manufacturer Part Number | EX311/4 |
| Size (in) | 1/4 - 28 |
| Features & Benefits | • EX31 series • Uncoated (steam oxide) surface treatment • Unified fine thread • Meets DIN 2184-1 - tap standard • 2B internal inch thread medium class of fit • Blind hole application • 2.5 x D usable tool depth to diameter ratio • High speed cobalt powder metal tool material • Semi-bottoming tap chamfer (2 - 3 pitch lead) • Spiral flute geometry • 45° Helix Angle (Flute) • Right hand rotation/cutting |
| Diameter (in) | 1/4 |
| Diameter (mm) | 6.35 |
| Thread Size x Pitch | 1/4 - 28 |
| Drill Diameter (mm) | 5.5 |
| Overall Length (in) | 3.1496 |
| Overall Length (mm) | 80 |
| Flute Length (mm) | 10 |
| Flute Type | Spiral Flute |
| Type | Machine Tap |
| Square Size (mm) | 5.5 |
| Application | Various |
| Pitch | 28 |
| Pitch (mm) | 28 |
| DIN | DIN 371/376 |
| Threads Per Inch | 28 |
| Number of Flutes | 3 |
| Thread Type | UNF |
| Material | HSS-E-PM |
| Coating/Finish | Bright Blue Ring |
| Tap Drill Size (mm) | 5.50 |
| Thread Length (mm) | 10.00 |
| Thread Diameter (mm) | 1/4 |
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