The Tool Desk
Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →To match a bottle cap reliably, identify the bottle’s complete neck-finish code and closure type—not just its diameter. For example, 28-400 and 28-410 are both nominally 28 mm, but their thread geometry and finish height differ, so a cap that begins to turn may still fail to seat or seal.
What does a bottle finish code mean?
In a code such as 28-400, “28” is the nominal finish diameter in millimetres; “400” identifies the finish series. The series describes geometry such as thread turns, finish height and the relationship between the closure and sealing surface. Diameter alone is not a complete specification. [SGSBOTTLE’s comparison of 28-400 and 28-410]
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For a 28-400 finish, SGSBOTTLE gives example dimensions of T 27.38 mm ± 0.25, E 24.99 mm ± 0.25, minimum bore 15.60 mm, finish height 10.16 mm and thread start 1.17 mm. Its 28-410 glass drawing gives T 27.33 mm, E 24.94 mm and height 17.73 mm. These are values from that supplier’s reference drawings, not universal dimensions for every bottle bearing those designations. Use the actual bottle drawing and its tolerances when specifying a production match.
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How can you identify a neck finish from a cap?
A cap’s appearance or measured diameter may narrow the possibilities, but it does not establish the bottle finish. Start with the bottle’s packaging specification, a marking on the bottle, or the supplier’s technical drawing. If the code is unknown, measure the bottle finish with suitable dimensional tools and compare the measurements with a technical drawing. Catalog drawings commonly identify dimensions such as T, E, I, H and S; the S dimension affects closure orientation and thread engagement. [Richmond Group packaging closure guidance]
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- Use as a reference tool in determining the pitch of a thread that is on a screw, nut, fastener or in a tapped hole.
- Saves time, in that it, removes the need to measure and calculate the thread pitch of the threaded item.
- Measures thread counts from 4 to 42 SAE and .25 to 6.0mm.
- 60 degree thread profiles and locking devices.
- Find the bottle specification. Look for the complete finish designation on the bottle, packaging specification or supplier drawing.
- Identify the closure family. Determine whether the cap is continuous-thread, PET PCO, crown, lug/twist-off, ROPP or another system.
- Measure only against a drawing. If no designation is available, record the relevant finish dimensions using suitable tools and compare them with a technical drawing for the candidate finish.
- Check the closure specification too. Compare the complete finish code and bottle drawing with the closure drawing, liner or seal, and tamper-evident features.
- Confirm the application. For production or critical packaging, ask the bottle and closure suppliers to confirm compatibility and conduct the evaluation appropriate to the contents and process.
Can a cap fit a finish it was not made for?
It can sometimes appear to engage without being a correct match. The 28-400 and 28-410 example illustrates why: their nominal diameters are close, but the finish height and thread geometry differ. A cap that catches or turns is not proof that it will seat, seal or remain secure. Match the full finish designation and verify it against the relevant drawings and tolerances.
Which closure types are interchangeable?
Do not assume that closures are interchangeable just because their diameters look alike. Different closure families use different interfaces or application methods.
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| Closure family | Matching consideration |
|---|---|
| Continuous-thread screw cap | Match the complete neck-finish designation, thread geometry and sealing arrangement. |
| PET PCO closure | Use the specific PET finish and closure specification; some listed PET PCO finishes are designed for tamper-evident plastic closures. [CETIE finish-data listings] |
| Crown cap | Match the crown closure interface and application method; a screw-cap diameter is not a compatibility check. |
| Lug/twist-off lid | Match the lug arrangement and sealing interface rather than relying on a similar-looking diameter. |
| ROPP roll-on closure | Confirm the bottle finish and closure intended for the roll-on application equipment. |
What else determines whether the cap will seal?
Even a geometrically suitable cap needs the right sealing and application conditions. Check the closure liner or seal, the bottle’s sealing surface, tamper-evident design, contents and filling conditions, and the capping equipment and process. A PET PCO finish listing, for instance, describes a finish intended for a specified closure type; the exact drawing and closure specification govern the application. [CETIE finish-data listings]
Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsFor consumer replacement caps, confirm the complete neck-finish designation first, then check that the liner and intended use suit the bottle. For pressure, food, chemical or other critical packaging, obtain confirmation from the relevant suppliers and carry out the application-specific evaluation; general finish information cannot validate an unprovided bottle-and-cap combination.
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When is “28-400 bottle caps” a useful search?
Use a product phrase such as “28-400 bottle caps” only after confirming that the bottle has a 28-400 continuous-thread finish. Amcor lists a 28 mm, 400 continuous-thread polypropylene closure as an example; that listing does not establish universal fit for every 28-400 bottle or packaging application. Check the closure drawing, liner and intended use before selecting a cap. [Amcor closure products]
Quick Recap
Best Value
- It is 55 Degree & 60 Degree Thread / Screw Pitch Gauge gage with lock up device. Typically used to check the thread size determination is correct
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- Imperial: 4G, 4 1/2G, 5G, 6G, 7G, 8G, 9G, 10G, 11G, 12G, 13G, 14G, 16G, 18G, 19G, 20G, 22G, 24G, 25G, 26G, 28G, 30G, 32G, 36G, 40G, 48G, 60G, 62G; US: 8, 10, 11, 14, 19, 28
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