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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →The Miyota Caliber 8N40 is an automatic skeleton movement with hand winding, a small-seconds display and a stop-seconds device. MIYOTA publishes a standard 8N40 and a separate 8N40 Gilt variant; check which one is in a watch before sourcing parts.
What is the Miyota 8N40?
MIYOTA describes the 8N40 as a standard automatic skeleton movement. It supports automatic winding and hand winding, displays hours and minutes with small seconds, and has a stop-seconds device. The maker also lists an 8N40 Gilt version. These are manufacturer descriptions, not a list of watches confirmed to use the caliber. MIYOTA’s 8N40 product page
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Miyota 8N40 specifications
The figures below are MIYOTA’s published specifications; they are not independent test results. The product page and technical sheet do not state publication years.
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| Specification | MIYOTA’s published figure |
|---|---|
| Movement size | 11 1/2”’ (ligne) |
| Diameter on technical sheet | Φ26.00 mm |
| Height | 5.55 mm |
| Stated accuracy | −20 to +40 seconds per day |
| Posture difference | Under 50 seconds |
| Approximate running time | 42 hours |
| Vibration frequency | 21,600 per hour |
| Jewels | 21 |
| Lift angle in technical sheet | 49 degrees |
The technical sheet also lists minimum clearances of 0.45 mm and 0.20 mm. MIYOTA notes that clearance depends on the glass, case construction and hand length, so these values do not establish that a particular case or hand set will fit. 8N40 technical sheet
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How do you wind and set a Miyota 8N40?
Hand winding
The Cal. 8N40 instruction manual says: “Automatic winding watch can also be hand winded by turning the crown clockwise in Normal position.” Keep the crown in its normal, pushed-in position while winding. Cal. 8N40 instruction manual
The technical sheet gives 40 crown turns for the 82/8N series as guidance for a full wind. That is manufacturer measurement guidance, not a universal winding instruction for every watch containing the movement; follow the watch maker’s directions if available. The sheet recommends measuring accuracy 10–60 minutes after fully winding.
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Setting the time
- Pull the crown to the first click.
- Turn the crown to set the hour and minute hands.
- Push the crown back to its normal position.
The manual cautions that specifications may change without prior notice.
What parts fit the Miyota 8N40?
MIYOTA publishes separate parts lists for the standard 8N40 and the 8N40 Gilt. The standard list identifies components including winding stem 065-212 and a longer 24.0 mm setting stem, 065-A06. Some component identifiers differ in the Gilt list, so use the list for the exact variant rather than assuming the standard part numbers apply. Standard 8N40 parts list; 8N40 Gilt parts list
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A caliber name alone does not prove that a movement or component will fit a particular watch. Before ordering, verify:
- Whether the movement is standard 8N40 or 8N40 Gilt.
- The case and movement dimensions and the required stem length.
- The hand layout and clearances in the specific case.
- The exact part number against the appropriate parts list.
The parts lists document components but do not establish present-day retail availability. Movement disassembly or work requiring specialist tools is best handled by a qualified watchmaker.
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How does the 8N40 differ from the 8N40 Gilt?
MIYOTA lists the Gilt as a distinct version and provides it with a separate parts list. The documentation cited here does not establish a performance difference between the two. For parts sourcing, the practical distinction is to identify the installed variant and consult its corresponding list, since some component identifiers differ.
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