Bordo 6 x 3.2mm 180 Degree Counterbore

Bordo counterbores produce flat-bottomed recesses concentric with the original hole for socket head cap screws. The 180 Degree Counterbore (3870) is part of Bordo's comprehensive Australian cutting tool range — trusted by engineers, tradespeople, and machinists across industry and manufacturing.

Where this product is used

Counterbores produce a flat-bottomed recess concentric with the original hole — sized to suit the socket head cap screw head diameter and depth.

• Socket head cap screw recessing in engineering and toolmaking
• Creating flat-bottomed recesses for bolt heads in machined parts
• Production machining where counterbored holes are part of the part design

Selecting the right option

Counterbore diameter and depth are matched to the cap screw head and plate thickness. The pilot diameter must match the clearance hole diameter. Adjustable counterbores allow multiple screw sizes from one tool; fixed counterbores are more accurate in production.