IRWIN Cobalt High-Speed Steel Drill Bit, 5/16"
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IRWIN Cobalt High-Speed Steel Drill Bit, 5/16"

Item # 173506 OfficeMax # 24091037
  • 8% Cobalt for higher heat and abrasion resistance
  • Heavy-duty web construction for strength and durability
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$7.69 $7.69
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  • Estimated delivery 3-5 business days
Pricing, Assortment and Availability

  • 8% Cobalt for higher heat and abrasion resistance 
  • Heavy-duty web construction for strength and durability 
  • 135º split point begins drilling immediately, minimizing bit "walk" 

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Item # 173506 
Manufacturer # 585-63120  
weight 0.08 lb
brand name Irwin
Spiral Angle CW
Type Drill Bit
Cutting Diam 5/16 in
Point Angle 135°
Overall Length 2 13/16 in
distributor United, Inc.
Point Shape Split
Applicable Materials Hard Steel, Stainless Steel, Titanium
Flute Length 3 3/16 in
Structure Solid
Shank Type Cylinder
packaging type Bulk
Finish Gold Oxide
Length Group Jobber
Cutting Edge Material HSS-E (Co-M42)

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Rated 3 out of 5�by 2 reviewers.
Rated 1 out of 5�by cobalt drill bits Bought a new set of bits yesterday and I needed to drill6 holes through both 1/8" & 1/4" Angle iron bed frame material. The cobalt bits I bought failed miserably, could hardly get it done. Ended up having to step drill to get 6 - 1/4" holes through the material. I won't buy Irwin bits again!! April 1, 2015
Rated 5 out of 5�by Mr. These cobalt drill bits are the only thing that will drill into hardened bolts and metals. I have tried standard bits on hardened metal before not knowing what grade the metal was. The standard bit dulls almost immediately so I reach for the cobalt bits. They will sink on through the metal with no problem. The only cons are they are more expensive and they will break easily if you put force perpendicular to the bit instead of linear. May 28, 2013
  • 2015-07-28T00:00:17.838Z
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