Two of your bottles can measure 28 mm across the thread, take caps that look identical on a shelf, and still refuse to seal. The series after the dash is the difference, and on 28 mm necks it is the most common mismatch you will meet in glass packaging.
The Two Finishes, Side by Side
| Figure | 28-400 | 28-410 |
|---|---|---|
| Thread turns | One full turn. | One and a half turns. |
| T, thread diameter | 27.38 mm plus or minus 0.25. | 27.33 mm on the glass drawing. |
| E, diameter at the thread root | 24.99 mm plus or minus 0.25. | 24.94 mm on the glass drawing. |
| H, finish height | 10.16 mm. | 17.73 mm. |
| I, minimum bore | 15.60 mm. | Similar; the drawing gives the figure for the design. |
| S, top to first thread | 1.17 mm. | Similar; the drawing gives the figure. |
SGSBOTTLE forms both on 14 lines across Shandong and Xuzhou. The thread diameters sit within a few hundredths of each other. The heights differ by more than 7 mm, and your cap skirt is cut for one of them.
Height is what separates these two finishes, and your cap skirt is cut for one of them.
What the Extra Half Turn Buys You
Thread engagement. On a 400 finish your cap makes one pass around the neck, and the seal depends almost entirely on the liner pressing down. On a 410 finish it makes one and a half, so your cap holds itself against the glass and resists backing off under vibration, temperature swings and repeated opening.
That matters most where your closure gets used again and again. Lotion pumps, foamers, trigger sprayers and disc-top caps are stocked in 410 because they stay put; plain screw caps on your sauce or packer bottle are happy on 400. Your closure type usually decides the finish before your bottle does.
Where Each One Turns Up
| Finish | Typical closures | Typical packs |
|---|---|---|
| 28-400 | Screw cap with liner, tamper-evident cap, child-resistant cap. | Sauce, syrup and packer bottles; Boston rounds; spirits under a plain cap. |
| 28-410 | Lotion pump, foamer, trigger sprayer, disc-top, flip-top. | Soap and lotion bottles, toners, household sprays, larger droppers. |
Both appear across the SGSBOTTLE range, which runs your Boston rounds, sauce bottles and soap bottles from 30 ml to 1 L (1 to 34 oz) on 14 lines in Shandong and Xuzhou. A 250 ml (8 oz) bottle and a 500 ml (17 oz) bottle often share a shape, and your line and your closure decide the neck.
The Third Option Nobody Mentions
28-415 exists too: two turns on a taller finish again, at T 27.38 mm and a height of 27.48 mm. It carries your tall dispensing closures and dropper collars where the extra turn earns its place. Supply is thinner than for 400 and 410, so availability in your own market is worth confirming before you specify it.
What Goes on Your Enquiry
SGSBOTTLE has shipped both finishes to 40+ countries since 2013, so your closure supplier will know them. Your enquiry carries the full designation, the closure you already buy, the fill and its temperature, and the capping head. SGSBOTTLE engineers return the stock bottles whose finish drawing that closure fits, with the drawing attached, so your closure supplier confirms the match on paper before you commit a container.