Cleveland Twist Drill Q Cobalt Drills

Surface Treatment Application Guide

Material Group Material Example TiN
+35% speed
TiCN
+50% speed
TiAlN
+100% speed
Carbon Steels 1010, 1045 Better Best Good
Alloy Steels 4140, 8620 Better Best Better
Tool Steels A2, D2, H13 Good Best Better
Stainless, 300 Series 304, 316 Good Best Best
Stainless, 400 Series 414, 440 Good Better Best
Stainless, PH 15-5PH, 17-4PH Better Better Best
Cast Irons, Ductile   Better Better Best
Cast Irons, Gray Class 20-50 Better Better Best
Aluminum, Wrought 1100, 2024 Not Recommended Better Not Recommended
Aluminum, Silicon, Cast 319, 360, 380 Not Recommended Better Better
Copper & Alloys   Not Recommended Better Not Recommended
Brass   Good Better Good
Bronze   Not Recommended Good Good