www.irwin.com
Metal Drilling
METAL DRILLING
138
Shank
Length
Flute Length
Overall Length
Shank
Diameter
Point Angle
Drill Bit
Diameter
118
° Conventional Point
•
General use
•
Not self-centering
•
Best for stationary drills
•
Performs better in softer
materials vs. hard metal
135
° Split Point
•
Self-centering (won’t
“
walk”)
•
Best for portable drills
•
Requires less force
than 118°
TURBOMAX
®
Tip
•
Self-centering
(
won’t “walk”)
•
Precision-ground to
stay sharp longer and
drill faster
•
Best for portable drills
•
Requires less force than
118
°
135
°
Point Angle
118
°
Point Angle
Shank Length:
The end of the drill bit that is secured by the drill
Flute Length:
The length from the point to the end of the flutes
Black & Gold
TURBOMAX
®
Heavy-Duty
Titanium Nitride
Cobalt
General
(
TiN) Coated
Purpose
Material
Point Angle
(135
°)
(
TURBOMAX
)
(135
°)
(135
°)
(135
°)
(118
°)
Wood/Drywall
Sheet Metal
Mild Steel
High Alloy Steels
Stainless Steel
Cast Iron
Aluminum, Brass & Copper
Plastic
Overall Length:
The length from the point to the end of the drill bit
Point Angle:
The angle of the cutting edges
Drill Diameter:
The cutting diameter of the drill bit
Engineered for Controlled Precision and Speed
Key:
Recommended
Acceptable
Not Recommended
Drill Bit Selection
Tip Geometry