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445U72 Counterbores with Built-In Pilots

$119.71

Bulk orders will be discounted, please contact us.

High-speed steel counterbores are the most common choice for creating a flat-bottomed cavity at the top of the hole so that a bolt, nut, or other part is hidden beneath or sits flush with the top of the hole when installed into it. High-speed steel is less brittle than cobalt and can better withstand vibration and chattering. Sometimes known as solid pilot counterbores, these counterbores have a built-in pilot that cannot be removed and which keeps the counterbore centered in the hole to ensure a level seat.

Product Number: 445U72

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  • Description
Mfr Model C91709
Measurement System Fractional Inch
Pilot Dia 21/64 in
Overall Length 6 in
Shank Type Machining Straight
Shank Dia 7/16 in
Material Machining High Speed Steel
Pilot Length 3/8 in
Standards ANSI; DIN 1897
Primary Material Application All Materials
Primary Material Application ISO Code K; M; N; S1
UNSPSC 23153312
Country of Origin USA (subject to change)
Counterbore Type Standard
For Screw Size 5/16 in
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