Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsThe Hangzhou 8240—also listed as 8240A and HZ8240—is an automatic mechanical watch movement with central hours and minutes, small seconds at 6 o’clock, and a date at 3 o’clock. Caliber Corner reports a 30 mm diameter, 6.28 mm height, 26 jewels, a 28,800-beat-per-hour frequency and a 72-hour power reserve. Those figures come from its movement database, not independent testing or a Hangzhou-issued specification sheet.
What is the Hangzhou 8240?
Caliber Corner identifies Hangzhou Watch Co. as the maker and associates the caliber numbers 8240, 8240A and HZ8240 with the same movement listing. It describes the movement as automatic and self-winding, with central hours and minutes, small seconds at 6 o’clock and a date at 3 o’clock. The database describes its country of manufacture as China. Caliber Corner’s 8240 listing is the source for these identification details.
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Caliber Corner’s company overview says Hangzhou Watch Co. was established in 1972 and places the 8240 within a broader movement lineup. That is secondary-source background rather than a manufacturer history. Caliber Corner’s Hangzhou Watch Co. overview
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The following figures and features are reported by Caliber Corner’s movement listing. No Hangzhou-issued technical sheet or independent performance test is established here.
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| Specification | Reported value |
|---|---|
| Movement type | Automatic, self-winding mechanical |
| Diameter | 30 mm |
| Height | 6.28 mm |
| Jewels | 26 |
| Frequency | 28,800 beats per hour (4 Hz) |
| Power reserve | 72 hours, as reported by the database |
| Indicated functions | Central hours and minutes; small seconds at 6 o’clock; date at 3 o’clock |
| Other listed features | Hand winding, hacking seconds, Novodiac-style anti-shock device and Etachron-style regulator |
| Lift angle | Unconfirmed |
| Country of manufacture | China |
The 72-hour reserve is a database-reported specification, not a verified real-world result. Likewise, the listing’s regulator and shock-device descriptions are not evidence that parts or service procedures are interchangeable with other movements.
Which watch is confirmed to use the HZ8240?
Pagani Design’s product page identifies its PD-YS029 as powered by an “Automatic mechanical HZ8240” movement. This confirms a finished-watch example; it does not establish standalone movement sales or parts availability. The page also lists a 42 mm case, 12 mm thickness, synthetic sapphire crystal and 100 m (10 BAR) water resistance. Pagani Design PD-YS029 product page
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For the PD-YS029, the same page gives a strap width of 26.2 mm and separately says the model accepts standard 26 mm straps. Treat those as the maker’s two separate statements; they do not establish universal strap fit. Pagani Design advises that the crown be screwed down before water contact and says to check the model’s specific water-resistance rating before swimming or showering.
Does the 8240 fit or replace another caliber?
The available specifications do not establish compatibility with other calibers, a drop-in replacement, or authorized supply of the movement or replacement parts. A shared diameter or similar feature list alone would not establish interchangeability. For repair or replacement, seek model-specific guidance from the watch’s manufacturer or a qualified watchmaker rather than ordering parts on the basis of the caliber name alone.
Quick Recap
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