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W O R L D C L A S S P R O V I D E R O F C U T T I N G T O O L S

UD Ultra Parabolic Twist Drill

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 and Extra Length Long series.

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.

Benifits of the heavy duty UD Drill Range

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

Drill Characteristics

Flutes Wide, polished, "PARABOLIC FORM" flutes with a 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 resistence 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 centring, 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 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 centring and easier penetration. Available on UDL and UDS drills from 1mm to 13mm diameter.

How to use the drill feed chart
1. Locate Feed Curve (determined from the selection guide)
2. Locate Drill diameter along bottom axis of chart
3. Determine point of intersection of Feed Curve and Drill diameter
4. Project horizontally from point on intersection to left hand side
of chart and read off nearest FEED in mm/rev
5. Select nearest Feed on drilling machine within +/- 20% of chart figure.

Recommended UD Drill Feeds (mm/rev.)

UD Ultra Parabolic Drill Product Type Summary / UD Ultra Parabolic Twist Drill Selection Guide

Somta UD Drill Product Code	UDL Long Chip	UDS Short Chip	UX Notch Point	Split Point	Drill Length
153 163 154 164 155 109 110 118 119 120	x x x x x x x x x	x	x x x x x x x	x x x	Stub Stub Jobber Jobber Jobber Long Series Long Series Extra Long Series 1 Extra Long Series 2 Extra Long Series 3

Or download our leaflet on UD Ultra Parabolic Twist Drills in pdf.
UD Ultra Parabolic Twist Drill | Solid Carbide Tooling | Colour Band Range | MTS Chipbreaker Drills
Solid Carbide High Performance Roughing and Hard Material Finishing End Mills | Reamer Tool Range

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UD Ultra Parabolic Twist Drill