A 750 ml wine bottle does not have one universal cork size, and a 1.5 L magnum does not automatically need a wider cork. Choose the stopper from the bottle's internal neck profile, the closure construction and the bottling conditions. Bottle capacity is useful context, but it is not a fit specification.
For a bulk order, obtain the glass supplier's neck drawing before asking for a diameter and length. If you are replacing an existing closure, send an unused stopper and representative bottles as well. The following guide focuses on compressed straight corks for still wine; bar-top stoppers and pressurized wine packages need a different review.
Quick cork-size reference for 750 ml and 1.5 L bottles
| Bottle or closure | Useful starting point | What still needs confirmation |
|---|---|---|
| 750 ml still-wine bottle | Internal neck drawing and proposed straight cork dimensions | Bore profile and tolerances, stopper construction, corking equipment and intended storage |
| 1.5 L still-wine magnum | The magnum's own neck drawing | Whether its finish differs from the 750 ml bottle; do not add diameter solely because capacity doubles |
| Bar-top or T-top bottle | Stem dimensions, insertion depth and head design | Insertion, removal and sealing performance of the complete assembly |
| Sparkling or other pressurized wine | A closure and retention system specified for that application | Pressure requirements, bottle finish and the supplier's application approval |
What do cork dimensions such as 44 × 24 mm mean?
State the dimension order in your enquiry. In the examples below it is length × uncompressed diameter. The stopper diameter before insertion is not the same measurement as the glass bore after the cork has been compressed and inserted.
For a real manufacturer reference, Amorim's Twin Top Evo page lists 44 × 24 mm and 49 × 24 mm. Its Naturity page lists lengths of 45, 49 and 54 mm with 24 or 26 mm diameter options. These are examples from those product families, not a universal size chart or a statement of STDPAK stock.
The practical lesson is that length and diameter must be selected together with the actual neck and stopper material. A different length does not, by itself, establish a specific number of years of wine storage.
Measure the sealing area, not the outside lip
The visible outside diameter at the bottle mouth is not the surface a straight cork seals against. Ask the glass supplier for the internal neck profile over the intended insertion length, including dimensional tolerances. A single caliper reading at the opening cannot describe the bore farther down.
Where measurements are needed, agree the method and measurement depths with the glass and closure suppliers. Use representative bottles from the production supply rather than one unusually good sample. Record the bottle reference, drawing revision and measurement positions so a later replacement order uses the same information.
Do not turn a mould mark or a nominal external finish dimension into a cork recommendation without the matching drawing. Likewise, a screw-cap bottle and a cork-mouth bottle should not be treated as interchangeable because both hold 750 ml.
Does a magnum need a different cork?
It may, but the answer comes from its neck and the intended package, not from volume alone. Compare the 750 ml and 1.5 L drawings side by side. If the sealing profiles differ, ask the closure supplier to propose dimensions for each. If they appear equivalent, still obtain confirmation for the proposed glass, stopper and bottling conditions.
Amorim's cork-stopper best-practice checklist treats wine style, bottle specification and bottling conditions as selection inputs. Its Naturity guidance also describes selecting diameter from the internal bottleneck profile and the relevant wine and corking conditions. That is a stronger basis for a purchasing decision than assuming that every magnum has a wider opening.
Choose the closure construction before setting acceptance limits
Natural, technical and synthetic closures should be reviewed using the specification for the proposed product. Ask for the construction, surface treatment, dimensional tolerances and relevant performance information. Do not assign a storage life or oxygen-transfer performance merely from the material name.
A straight wine cork is compressed for insertion. A bar-top stopper combines a head and stem and must be assessed as that assembly. A tapered tasting stopper is another format. Photographs of these different closures are not a reliable basis for borrowing dimensions between them.
For a bar-top project, the bottle-bore fit guide explains the interface questions. For material proposals, use the cork versus synthetic stopper guide to organize the evidence you need rather than choosing from a broad material claim.
Approve a filled-package trial before a bulk order
- Identify the components. Record the bottle drawing revision, stopper reference, dimensions, construction and treatment.
- Review the line. Ask the bottling team and closure supplier to agree equipment suitability, compression and insertion settings for that combination. Do not copy a setting from a different closure.
- Check application and opening. Review installed position, visible damage and extraction behavior using agreed methods.
- Test the filled pack. Agree storage positions, temperature conditions, test duration, leakage checks and any required sensory or oxygen-management evaluation with the responsible team.
- Keep the approval record. Retain samples and acceptance criteria, and repeat the affected checks when the bottle, closure, treatment or process changes.
The stopper insertion and extraction guide helps organize opening checks. The exact test limits belong in the approved project specification; this article does not establish a shelf-life claim.
What to send when requesting cork samples
- Bottle capacity, supplier reference and complete neck drawing.
- Wine type and relevant filling or pressure conditions.
- Required closure format and any existing approved stopper sample.
- Target storage, opening and distribution requirements.
- Quantity, printing brief, destination and required schedule.
Browse STDPAK wine cork references to identify the format you want to discuss. The straight cork reference and logo-printing reference are enquiry starting points; confirm the required dimensions and construction separately. For a headed closure, use the bar-top collection instead.
STDPAK's standard MOQ is 30,000 pcs, with stated production lead time of 35–45 days. Confirm the selected configuration, printing requirements and schedule in the quotation; shipping and sample preparation are separate planning items. Send your bottle drawing and cork requirements.
Frequently asked cork-size questions
What size cork fits a 750 ml wine bottle?
There is no single answer from capacity alone. Use the bottle's internal neck drawing and ask the closure supplier to confirm the stopper dimensions, construction and corking conditions. A catalogue size is a candidate for approval, not proof of fit.
Can the same cork fit a 750 ml bottle and a 1.5 L magnum?
Possibly, if the relevant neck and closure specifications support it. Compare both drawings and obtain confirmation. Do not assume either that the sizes must match or that a magnum always needs a larger diameter.
Does a longer cork guarantee longer ageing?
No. Length alone does not establish oxygen management, sensory performance or storage life. Request product-specific information and validate the intended package.
Can I select from the outside neck diameter?
No. Straight cork fit depends on the internal sealing profile. Provide the complete drawing rather than a single outside measurement.
Can I use these still-wine suggestions for sparkling wine?
No. Pressurized packages need their own closure, bottle and retention-system assessment. Ask for a proposal specifically qualified for that application.