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Countersinking

Countersinking machines a chamfered recess around a hole so the head of a flush-fit screw sits level with — or below — the surface of the part.

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About Countersinking

A flush-screw finish is what you reach for when the screw head can't be left sitting proud of the surface. Where the screw head needs to sit level with the panel surface — visible installations, walk-on surfaces, cabinet doors, signage where the fix has to look intentional — the hole gets countersunk. The chamfer matches the angle of the screw head; the depth lets the head drop flush.

We countersink on the CNC as a separate operation in-line with the drill and cut steps. Standard profiles are 82° (imperial countersunk screws), 90° (metric countersunk screws), and 100° (specialist flat-head). 90° is the most common request — it matches almost all the metric countersunk fasteners on the Australian market.

For your file, mark countersunk holes on a separate layer labelled CSK-XMM-Y° (where X is the through-hole diameter and Y is the chamfer angle). The naming is just a label — if you're not sure of the angle, write the screw spec ("M5 countersunk machine screw") and we'll match.

Countersinking pairs naturally with drilling and tapping. For tapped countersunk holes (threaded engagement with a flush screw head), specify both — the workflow is drill-tap-countersink on the same hole. Common in fabricated assemblies, machined fixtures, and detailed signage where the look matters.

Good for

  • Flush-fit screw installations — cabinet doors, signage, walk-on panels
  • Visible fixings where the fastener can't protrude
  • Trade-grade fabrication assemblies with countersunk fasteners
  • Architectural signage where the finish matters
  • Marine fit-out where snag-free surfaces are essential

Not for

  • Pan-head, dome-head or button-head screws — those sit proud and don't need countersinking
  • Through-bolt mount holes (use Drilling without chamfer)
  • Materials too thin to countersink without breaking through
See all 10 add-ons Browse the confirmed material list →

Countersinking — common questions

What chamfer angle do I need?
90° for almost all metric countersunk machine screws (the standard on the Australian market). 82° for imperial countersunk screws. 100° for some specialist flat-head fasteners. If you're unsure, write the screw spec on your enquiry and we'll match.
Can you countersink a tapped hole?
Yes — drill, tap, countersink on the same hole in the same setup. Mark all three on separate layers in your file (DRILL-XMM, TAP-MX, CSK-XMM-90) at the same point coordinates.
What file types can I send?
DXF is the cleanest — that's a single-line vector format the cutter reads directly. AI, SVG, PDF, EPS and DWG all work too. If you've only got a JPG or a sketch on paper, send it anyway and we'll tidy it for you (small file-prep charge applies).
How should I prepare a DXF?
Outlines only, no fills. One closed path per cut. Different operations (cut, engrave, drill) on different layers so we know what gets which tool. Convert text to outlines before exporting so we don't have to chase the same font. If anything's ambiguous, write it in the file name or add a note in the quote request.
How quick is a quote?
Most quote requests reviewed within 1 business day. Simple trade jobs may be quoted faster during business hours (Mon–Fri 8am–4pm AEST). Complex, review-required, or unusual jobs may take longer. We'll tell you up front if so.

Ready to quote countersinking?

Quote back, usually within 1 business day. No card needed.

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