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5/16" Cobalt Drill Bit Item # 173506 OfficeMax # 24091037

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

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    5/16 Cobalt Drill Bit 5 5 1 1
    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
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