Primary process: Injection Molding. The full route, materials, tolerances and design tips for a bottle cap, with an indicative cost.
Injection MoldingPrimary process
PolymerFamily
7Route steps
+/-0.05mmTypical tol.
A bottle cap is primarily made by Injection Molding. Plastic injection moulding injects molten polymer into a cooled steel mould under pressure; it solidifies and ejects as a finished part in seconds. Below is the full route to make a bottle cap, 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 bottle cap is made
The usual route, raw material to finished part. The amber step is where the bottle cap gets its basic shape.
Material
Select the polymer grade and colourant for the bottle cap and dry the pellets.
Tooling
Cut the steel or aluminium mould that forms the bottle cap.
Injection Molding
Melt and form the polymer in the cavity to make the bottle cap.
Tooling High (steel mold) Tolerance ±0.05 to 0.2mm Lead 4 to 8 weeks
De-gate and trim
Remove the runners, gates and flash.
Secondary
Where the bottle cap needs them, add inserts, printed graphics or machined details.
Tooling None Tolerance ±0.125mm, to ±0.025mm Lead 1 to 10 days
Assembly
Where the bottle cap joins other parts, snap-fit, weld or bond it into the finished product.
Tooling Low Tolerance good Lead immediate
Inspection
Check fit, finish and any functional dimensions.
Need the real cost for a bottle cap? 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 bottle cap
Grade
Why it suits this
Polypropylene (PP)
Cheap, chemical-resistant, living hinges
HDPE
Tough, cheap, chemical-resistant
Design
Design tips
General pointers. The full design-for-manufacturing list for a bottle cap is in the dossier.
Low-cavity tooling.Use 16 to 48-cavity for the volume.
Over-thick wall.Thin + even walls.
Cost
What a bottle cap should cost
At these volumes, cavitation count and cycle time rule cost.
PER-PART COST vs VOLUME
Per-part cost drops as volume spreads tooling and setup over more parts. The exact figures for a bottle cap at your volume, in your currency, are in the dossier.
MODEL EST.
$615 to 1045per 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 bottle cap 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 bottle cap is primarily made by injection molding. The route is: Material; Tooling; Injection Molding; De-gate and trim; Secondary; Assembly; Inspection.
What does a bottle cap cost?
It depends on size, tolerance and volume. As a rough ballpark it starts around $615 to 1045 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 bottle cap made from?
Common choices are Polypropylene (PP); HDPE.
What is the main process for a bottle cap?
Injection Molding. High-volume plastic parts of almost any shape, from housings to medical devices.
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.
