UD Ultra Parabolic Twist Drills

This range of drills is specifically designed to meet the challenges of a broad spectrum of difficult drilling applications. Available in Fractional and Metric, sizes in Stub, Jobber, Long Series and Extra Length.

BENEFITS OF THE HEAVY DUTY UD DRILL RANGE

• Easier penetration and reduced time per hole
• Increased hole depth and accuracy
• Increased number of holes per sharpening
• Reduced drilling cost
• Coatings – these drills can be supplied with either TiN, TiCN or TiAlN coatings to further enhance their performance. Suggested coatings are indicated in the drill selection guide.

PRODUCT TYPES

UDL
Designed for LONG CHIP FORMING MATERIALS, such as Aluminium, Copper and Stainless Steels, with special UX Notch point or Split point.

UDS
Designed for SHORT CHIP FORMING MATERIALS, such as Titanium and Nickel Chrome Alloys, with special UX Notch point or Split point.

DRILL CHARACTERISTICS

Flutes
Wide, polished, “PARABOLIC FORM” flutes with 40° helix on UDL and 33° helix on UDS drills provide fast chip removal and reduced heat generation at the point. The increased web thickness allows increased feed rates.

Materials
Manufactured from HSS-Co (5% Cobalt) to ensure increased wear and heat resistance during drilling operations.

Hole depth
Hole depths greater than 5 times diameter with the uncoated drill (conventional drill 3 times diameter). Hole depths up to 15 times diameter with coated drills, with proportionally reduced feed rates.

POINT STYLES

UX NOTCHED POINT – TO DIN 1412 FORM D
The 130° special notched “UX” point style provides self centering, easier penetration, improved hole accuracy and improved load distribution. This special notch geometry gives a corrected rake angle of 15° which provides a strong point for harder materials, as well as preventing snatching with materials such as Aluminium, Brass, Bronze and Plastics. Available on UDL and UDS drills from 1/8″ (3mm) to 1/2″ (13mm) diameter.

SPLIT POINT – TO DIN 1412 FORM C
The 130° SPLIT POINT is a conventional point providing self centering and easier penetration. Available on UDL and UDS drills from 1mm to 13mm diameter.

* Non Standard Product

View the UD Ultra Parabolic Twist Drills Leaflet