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20C957 Counterbores with Built-In Pilots

$47.61

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: 20C957

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  • Description
Mfr Model 302-0.4375
Measurement System Fractional Inch
Pilot Dia 7/16 in
Overall Length 7 in
Shank Type Machining Straight
Shank Dia 1/2 in
Material Machining High Speed Steel
Pilot Length 14.00 mm
Standards ISO 9001:2008
Primary Material Application All Materials
Primary Material Application ISO Code S3
UNSPSC 23171610
Country of Origin USA (subject to change)
Counterbore Type Oversized
For Screw Size 7/16 in
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