Reference Guide

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°
135°
Point Angle
118°
Point Angle
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