Buy Counterbores Online in Australia
Counterbores machine a flat-bottomed recess so a cap screw or bolt head sits below the surface. This range has 5 active listings from Bordo and Sutton Tools: 180 degree counterbores, counterbore drills, a solid pilot cobalt HSS-E counterbore and two Bordo sets.
What's in the range
| Type | Listings | What's there |
|---|---|---|
| Bordo 180 degree counterbores | 2 | Bordo 3870 180 degree counterbore and the 3871 180 degree counterbore drill, each with multiple size options. |
| Bordo sets | 2 | Bordo 3870-SET and 3871-SET, each 6 pieces covering 3 to 10mm. |
| Sutton counterbore | 1 | Sutton C100 counterbore: cobalt HSS-E, solid pilot, 3 flute. |
Choosing a counterbore
Work out the screw head diameter and depth first, then choose a counterbore with a pilot that fits the hole you have already drilled. A solid pilot guides the cutter, so it suits repeat work in existing holes. Always check the data sheet for size range, pilot size and material suitability of the exact counterbore before you order.
Related ranges
Countersink Bit Sets | Combined Drill Countersinks | Drilling | Machining | Bordo | Sutton Tools
Order from AIMS Industrial
AIMS Industrial has supplied Australian industry since 1988. Call us on (02) 9773 0122, contact the team or request a quote and we'll help match the right counterbore to your fastener.
Counterbore FAQs
What is the difference between a counterbore and a countersink?
A counterbore cuts a flat-bottomed recess for a socket head cap screw or bolt head, while a countersink cuts a conical recess for a flat head screw.
What does a solid pilot do?
The pilot locates the counterbore in the existing hole and keeps the cutter centred, so the recess is concentric with the hole.
Do you sell counterbores in sets?
Yes. Bordo 3870-SET and 3871-SET are 6 piece sets covering 3 to 10mm. Individual counterbores are also listed in multiple sizes.