Standard Gundrill Head Profiles

G drilling profile
Profile G (universal)

Standard form for most material types, particularly for materials with a tendency to shrink. Recommended for high precision bore tolerance and straightness. Maintain precise exit hole size. Recommended when extra burnishing is required. 

A drilling profile
Profile A

Suitable for cast iron (usually coated) and aluminum alloys/ Can be used for cross drilling, angular entry or exit and for interrupted cut. Large coolant gaps between pads.

B drilling profile
Profile B

Excellent size control, for high precision hole tolerance. Used for cast iron and aluminum alloys.

C drilling profile Gundrill head
Profile C

Used for angled entry or exit. Large back taper, for shrinking materials such as types of alloys and stainless steel. Large coolant gaps between pads.

D drilling profile
Profile D

Suitable for cast iron only. Very effective in grey cast iron (usually coated).

E drilling profile
Profile E

General use, for alloys and stainless steel. This profile eliminates the problem of the tool sticking in the hole after the outer corner dulls. Especially suitable for crankshaft and other forged materials. Recommended for accurate hole straightness.

H drilling profile
Profile H

Recommended for all non-ferrous and cast iron materials up to 5 mm diameter. Sometimes used for wood and plastic with larger back taper.

I drilling profile
Profile I

Used for aluminum and brass for best hole finish. For intersecting holes and interrupted cut or when extra outer diameter support and burnishing is required.