Dormer 1/4 – 28UNF HSS-E-PM Machine Tap – E033

Spiral flute machine tap with chamfer form C with a 2 – 3 x P semi-bottoming lead, for Unified National Fine thread UNF 1/4in with 28 TPI and 2B class of fit, dimensions according to ISO 529 standard with 6.3mm shank and 5mm square drive, powder metallurgical HSS-E with uncoated surface finish and 45 helix angle for 2.5 x D blind hole threading in general purpose applications.

Brand :Dormer

Manufacturer Part Number :E0331/4

Size (in) :1/4 – 28

Features & Benefits : E033 series
Thread form, unified fine
Meets ISO 529 standards
Internal inch thread medium class of fit
Blind hole application
2.5 x D usable tool depth to diameter ratio
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) :5.50

Overall Length (in) :2.5984

Overall Length (mm) :66

Flute Length (mm) :10

Flute Type :Spiral Flute

Type :Machine Tap

Square Size (mm) :5.00

Application :Various

Pitch :28

Teeth per Inch :28

Threads Per Inch :28

Number of Flutes :3

Thread Type :UNF

Material :HSS-E-PM

Coating/Finish :Steam Tempered

Tap Drill Size (mm) :5.50

Thread Length (mm) :10.00

Thread Diameter (in) :1/4