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Besly
Combined Drills
& Counterbores

High Speed Steel
Straight Shank
Double End

Number Sizes

 Catalog Number: T-174

Besly Combined Drills & Counterbores

These double end, combined drill and countersink center drills are used for centering the ends of work where the work is subsequently to be revolved on machine centers. The angle of the countersink part is made the standard 60° (included angle) to fit standard centers.

Available in plain type and bell type. On precision work, some users prefer the bell type, as the additional small 120 angular chamfer protects the edges of the center hole and reduces the danger of inaccuracies from marred center holes.


Besly
Counterbores
for Socket Head
Cap Screws

High Speed Steel
Straight Shank

Fractional Sizes

Catalog Number: 966

Besly Counterbores for Socket Head Cap Screws

Besly Counterbores are of the solid two lipped type, designed for high production and long life.

With only two cutting lips they are easily sharpened. Their spiral flutes give ample clearance and strength. Cutting like a twist drill, they eliminate chatter.


Besly
Counterbores
for Socket Head
Cap Screws

High Speed Steel
Straight Shank

Machine Screw Sizes

Catalog Number: 968

Besly Counterbores for Socket Head Cap Screws

Besly Counterbores are of the solid two lipped type, designed for high production and long life.

With only two cutting lips they are easily sharpened. Their spiral flutes give ample clearance and strength. Cutting like a twist drill, they eliminate chatter.


Besly
Counterbores
for 82-Degree
Flat Head
Machine Screws

High Speed Steel
Straight Shank

Machine Screw and
Fractional Sizes

Catalog Number: 971

Besly Counterbores for 82 Flat Head Machine Screws

These Besly Counterbores are for 82° flat head machine screws.


Besly
Counterbores
for Socket Head
Cap Screws

High Speed Steel
Straight Shank

Machine Screw Sizes
 

Catalog Number: 964

Besly Counterbores for Socket Head Cap Screws

These Besly Counterbores have clearance drill size pilots.


Besly
Counterbores
for Hex Head
Screws & Nuts

High Speed Steel
Straight Shank

Fractional Sizes

Catalog Number: 969

Besly Counterbores for Hex Nut Screws & Nuts

These Besly Counterbores have nominal screw size pilots.

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