Page 900 - Tungaloy Catalog

15° 35°
Amount of oil clearance

Available in special designed tool Outer land
Secondary 35° (Margin)
Oil clearance (h) relief angle Flute 35°
Primary D/3
relief angle D/8
Inner Outer Oil hole 15° Bearing surface 4~8° 45°
angle angle 15°
Inner relief angle Outer corner Bevel-style point geometry

Cutting edge Oil clearance h (mm)
Tool dia. angles α = 42° α = 30°
øDc (mm) β = 20° β = 20° 35°
3.2 ≤ øDc < 6.4 0.7 (0.1øDc + 0.4) D/3
6.4 ≤ øDc < 9.5 0.8 (0.1øDc + 0.6) D/8 D/3
9.5 ≤ øDc < 12.7 1.1 2.0 4~8° D/8
12.7 ≤ øDc < 15.9 1.5 3.0 45° 15° 4~8° 45°
15.9 ≤ øDc < 19.0 2.0 4.0
19.0 ≤ øDc < 22.0 2.4 4.5 Notch-style point Stuck-style point
22.0 ≤ øDc ≦ 24.0 2.6 5.0 geometry geometry
Note: α = Outer angle, β = Inner angle, øDc = Tool dia.

Selection of cutting edge angle
D/3
Type Outer angle Suitable materials Note D/8
α 4~8°
No.1 30º Grey cast irons, Standard 45°
Stainless steels
spec.
No.2 42º Carbon steels, Alloy steels -
No.3 15º Brittle workpiece materials -

Drivers 1°30' øDs h6 øDs h6
2 1.5
11
A type M type
25 25 RS
Drilling Tools Information needed for quotation
70

Please contact your Tungaloy Sales Engineer
Company: Name: Tel:

øDc = mm * Gundrilling depth: H = mm
* 2 Tool diameter: øDc
hole tolerance Flute length: R R = mm
(required)

* 3 Overall length: L L = mm Workpiece material

* 4 Driver code • Gundrill machine
A or M type ** Machine
• Others（ ）

* Required item
** If another type of driver is needed,
please inform the specification of driver on this sheet.
Most unmarked items are available on a RFQ basis, contact your sales rep for more information.
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