1 1 FMF Joined Aug 12, 2002 Messages 1,680 Location CT Apr 8, 2012 #1 I bought a left hand drill bit set with easy outs. The drill bits are supposed to be cobalt, but I see HSS imprinted on the shank of the bit.
I bought a left hand drill bit set with easy outs. The drill bits are supposed to be cobalt, but I see HSS imprinted on the shank of the bit.
A another Todd Joined May 15, 2006 Messages 2,586 Location Lakeside CA and Lake Havasu City AZ Apr 8, 2012 #2 My bet is they are high speed steel and not cobalt. BTW, IMO cobalt bits are worth the extra money if your are drilling metal.
My bet is they are high speed steel and not cobalt. BTW, IMO cobalt bits are worth the extra money if your are drilling metal.
J Jim_Truett Joined Jan 7, 2009 Messages 503 Location San Diego, California Apr 8, 2012 #3 "Cobalt" drill bits are HSS. Cobalt just defines the addition of 5% Cobalt (M35) or 8% Cobalt (M42) to the steel alloy to increase heat resistance.
"Cobalt" drill bits are HSS. Cobalt just defines the addition of 5% Cobalt (M35) or 8% Cobalt (M42) to the steel alloy to increase heat resistance.
T TMoto Joined Aug 4, 2010 Messages 455 Location CO Apr 9, 2012 #4 In addition, unless they're coated, HSS are bright silver and most if not all cobalt drill bits are a straw color.
In addition, unless they're coated, HSS are bright silver and most if not all cobalt drill bits are a straw color.
M mechtech2 Joined Sep 5, 2006 Messages 19,478 Location Chicago Area Apr 9, 2012 #5 Right, High Speed Steel can be cobalt coated. Cobalt drills are not 100% cobalt.
