Primary process: Drilling & Hole Making. The full route, materials, tolerances and design tips for a countersink, with an indicative cost.
Drilling & Hole MakingPrimary process
MachiningFamily
8Route steps
+/-0.05mmTypical tol.
A countersink is primarily made by Drilling & Hole Making. Drilling and deep-hole drilling cut round holes with a rotating drill, with gun drilling holding straightness over long lengths. Below is the full route to make a countersink, the materials it suits, the tolerances to expect and the main design points. The route is free, from the finder.
Step by step
How a countersink is made
The usual route, raw material to finished part. The amber step is where the countersink gets its basic shape.
Stock
Start from bar, plate or billet sized for the countersink.
Drilling & Hole Making (roughing)
Rough out the main shape, leaving stock on the critical surfaces.
Tooling None Tolerance ±0.05 to 0.2mm Lead hours to days
Finish machining
Take the finishing passes that bring the countersink to tolerance.
Tooling None Tolerance ±0.05 to 0.2mm Lead hours to days
Holes and features
Drill, ream and tap, and where needed broach splines or cut gear teeth.
Tooling None Tolerance ±0.05 to 0.2mm Lead hours to days
Heat treatment
Harden and temper if the countersink must resist wear or load, then finish-grind.
Tooling n/a Tolerance can distort Lead days
Grinding
Where the countersink has bearing or sealing surfaces, grind them to the tightest tolerance and finish.
Tooling Low (wheel) Tolerance ±0.002 to 0.02mm Lead days
Surface finish
Anodise, plate or coat for wear and corrosion resistance.
Tooling Low Tolerance adds microns Lead days
Inspection
Measure the countersink against the drawing, on a CMM for close work.
Need the real cost for a countersink? The free route above is yours. Unlock the full dossier to quote and source it.
Where this process typically lands. Tighter is possible with extra operations like grinding, at higher cost.
Materials
Materials for a countersink
Grade
Why it suits this
(matches the parent part)
n/a
Design
Design tips
General pointers. The full design-for-manufacturing list for a countersink is in the dossier.
Very deep holes (>5x dia).Allow peck/gun-drill or relax.
Drilled hole toleranced like a reamed one.Call out ream/bore only where needed.
Cost
What a countersink should cost
Usually a secondary op costed into the part; deep, tight or angled holes add time.
PER-PART COST vs VOLUME
Per-part cost drops as volume spreads tooling and setup over more parts. The exact figures for a countersink at your volume, in your currency, are in the dossier.
MODEL EST.
$1.9 to 5.3per part at 1 off
A rough ballpark only. The dossier gives should-cost at your exact volume and currency, with the full breakdown.
GET THE FULL DOSSIER
Everything you need to quote and source it
The free route above is yours. To actually put a number on a countersink and buy it well:
Should-cost at your exact volume in 12 currencies, with the material, processing, tooling and overhead breakdown
Who to source from, typical MOQ and lead time, and the exact RFQ checklist to send
A quote checker that tells you if a supplier quote is fair, and the red flags to watch
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A countersink is primarily made by drilling & hole making. The route is: Stock; Drilling & Hole Making (roughing); Finish machining; Holes and features; Heat treatment; Grinding; Surface finish; Inspection.
What does a countersink cost?
It depends on size, tolerance and volume. As a rough ballpark it starts around $1.9 to 5.3 per part at 1 off and falls with quantity. The dossier gives should-cost at your exact volume and currency. A model estimate, not a quote.
What material is a countersink made from?
Common choices are (matches the parent part).
What is the main process for a countersink?
Drilling & Hole Making. Holes of all kinds, and long straight bores like gun barrels and hydraulic cylinders.
See the exact route and should-cost for your part
The free finder maps your part to its process and full route. Pro adds should-cost at your volume, sourcing and an RFQ draft.
