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expired Posted by Rokket | Staff • Mar 27, 2023
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expired Posted by Rokket | Staff • Mar 27, 2023

IRWIN 3016031ZR Single Cobalt Alloy Steel High-Speed Steel Drill Bit, 31/64" x 6" $5 & More + Free Shipping w/ Prime or on $25+

$5.00

$16

68% off
Amazon
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Amazon [amazon.com] has IRWIN 3016031ZR Single Cobalt Alloy Steel High-Speed Steel Drill Bit, 31/64" x 6" for $4.99. Shipping is free w/ Amazon Prime or on $25+

Product Description from Store
  • Ideal for drilling in tough metal, including heavy-duty abrasive alloy metal drilling on hardened steel.
  • Made from industrial grade High-Speed Steel for increased durability. 8% Cobalt Alloy Steel alloy is heat and abrasion-resistant
  • 135-degree split-point tip starts drilling immediately with less force and eliminates "walking" across the work surface
  • Bit has a straight shank
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Product Info
Community Notes
About the Poster
Amazon [amazon.com] has IRWIN 3016031ZR Single Cobalt Alloy Steel High-Speed Steel Drill Bit, 31/64" x 6" for $4.99. Shipping is free w/ Amazon Prime or on $25+

Product Description from Store
  • Ideal for drilling in tough metal, including heavy-duty abrasive alloy metal drilling on hardened steel.
  • Made from industrial grade High-Speed Steel for increased durability. 8% Cobalt Alloy Steel alloy is heat and abrasion-resistant
  • 135-degree split-point tip starts drilling immediately with less force and eliminates "walking" across the work surface
  • Bit has a straight shank
Also see:

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Mar 27, 2023
58 Posts
Joined Dec 2015
Mar 27, 2023
alfrank
Mar 27, 2023
58 Posts
1/2" is same price also!
Original Poster
Pro
Deal Hunter
Mar 27, 2023
41,134 Posts
Joined Jun 2011
Mar 27, 2023
Rokket
Mar 27, 2023
Original Poster
Pro
Deal Hunter
41,134 Posts
Quote from alfrank :
1/2" is same price also!
So it is, thank you for posting. Reps to you for your help.
Mar 27, 2023
1,505 Posts
Joined Feb 2007
Mar 27, 2023
coltrane69
Mar 27, 2023
1,505 Posts
Quote from dapaloo :
seems to struggle with steel
you can buy a set of cobalt drill bits for $8.50
rather than $5 for 1
Do you have first hand experience with these particular Hanson Cobalt bits? I've never used Hanson cobalt bits before, but I have used dewalt, Bosch, and Greenfield cobalt bits and all of them eat through mild steel like nothing, especially with the right speed, pressure and cutting oil.

I really don't think you're going to find any legit cobalt drill sets for $8.50. The main brands all hover around $25-$40 for a 13 piece set. You might be able to get a harbor freight HSS or Titanium set for $8, but I doubt they'd last to long going through steel.
Mar 31, 2023
316 Posts
Joined Mar 2019
Mar 31, 2023
UpbeatKnob539
Mar 31, 2023
316 Posts
How is the US still using measurements like 31/64 of an inch in 2023? What is it going to take for the US to catch up with the rest of the developed world and start using normal metric measurements? Easy base 10 is the way, obviously.

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