Neither the NH36 nor the PT5000 should be treated as a drop-in replacement for a Miyota 8215. An NH36 differs in published size and calendar display, and compatibility depends on the watch’s complete assembly. For the PT5000, the dimensions and interfaces needed to confirm a conversion are not established here. Check the exact case, dial, hands, stem, and movement mounting before buying either alternative.
What the published specifications tell you
MIYOTA lists the 8215 as an 11½-line movement, 5.67 mm high, with three hands and a date display. TMI lists the NH36 as a 12-line movement, 5.32 mm high, with three hands and a day-date display. These are manufacturer specifications, not confirmation that either movement fits a particular watch.
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| Compatibility point | Miyota 8215 | NH36 | PT5000 |
|---|---|---|---|
| Diameter / line size | 11½ lines; see MIYOTA’s 8215 listing | 12 lines; 27.40 mm outside diameter, or 29.36 mm with dial holding spacer; see TMI’s NH36 specifications | Not established by the technical documentation available here |
| Movement height | 5.67 mm; MIYOTA | 5.32 mm; TMI | Not established |
| Calendar display | Three hands and date; MIYOTA | Three hands and day-date; TMI | Not established |
| Stem, dial, hands, case holder, and clearance | Must be checked against the specific watch and parts | Must be checked against the specific watch and parts | Must be checked against the specific watch and parts |
The NH36’s published outside diameter and height do not determine whether it will seat correctly in an 8215 watch. The movement holder, stem position, dial arrangement, hands, and available space all matter. The changed calendar function also means the existing date window and disc arrangement need particular attention.
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- Case seat and clearance: Confirm the case’s movement seat, holder or spacer, and caseback clearance against the alternative movement’s technical drawing.
- Stem and crown: Compare stem position with the crown tube, and verify stem length and crown fit. A movement that does not align with the existing crown cannot be installed as-is.
- Dial mounting: Check whether the dial feet and attachment method match. If they do not, the dial may need a supported alternative mounting method.
- Calendar window: Compare the date or day-date window position and disc arrangement with the dial opening. The NH36 has a day-date display, unlike the 8215’s date display.
- Hands and vertical space: Verify the hour, minute, and seconds-hand fittings, hand height, and clearance under the dial and crystal.
- Support for the exact case: Ask the watchmaker or movement supplier whether the caliber is supported in your specific watch, rather than relying on nominal movement dimensions alone.
Is the NH36 a viable option?
It may be viable in a particular watch if the case, holder, stem, dial, calendar opening, hands, and clearances all work with the NH36. The published specifications establish that it is a different size and has a day-date display; they do not certify an 8215-to-NH36 conversion for any specific case. Obtain the exact movement and case drawings and have the fit confirmed before purchasing.
#1 Best Overall
- Can be used as a spare to easier to replace your movement.
- High , calendar movement
- The material of the product is strong, , long service life.
- The color of the outer and the appearance of areas of different batches of products may be different, which not affect the use
Can you use a PT5000 instead?
A PT5000 conversion cannot be confirmed from the technical details established here. Do not rely on assumed dimensions or a general claim that it fits an 8215 case. Ask the supplier or a watchmaker for the PT5000 technical drawing and compare its interfaces with your exact watch, including the case seat, stem, dial, hands, calendar window, and caseback space.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should you buy if you want a straightforward repair?
If your goal is to restore the watch without redesigning its fit, look for a like-for-like Miyota 8215 replacement and verify the exact caliber and watch compatibility with the supplier. A different caliber may be possible, but it is a conversion project—not a guaranteed swap.
Quick Recap
Best Value
- Function: Hour, Minute, Second
- Winding: Automatic
- Frequency: 21,600 Beat
- Diameter: 25.8mm
- Thickness: 5.6mm
Rank #4
- Movement: miyota 8215 automatic mechanical (No hack second stop function)
- Size : 26mm x 7.5mm
- Type: white date;
- Colour:White
Rank #3
- VERIFY YOUR WATCH MODEL & MEASURE THE CORRECT SIZE USING A RULER – Watch Parts Are Model and Size Specific. Please Verify Compatibility Before Purchasing.
- Compatibility & Size: Automatic Movement 21 Jewels Date @3 Gold + Extra Parts, compatible with Miyota 8215 Japan.
- Designed for a designed for a great fit: Verify the size, color, and model compatibility with your specific watch before purchasing to Designed for a designed for a great fit and avoid returns or exchanges.
- Compatibility Check: Double-check your watch's requirements and compatibility details to confirm the product meets your needs.
- Product: This is an made to original factory specs for a custom fit.
Rank #2
- VERIFY YOUR WATCH MODEL & MEASURE THE CORRECT SIZE USING A RULER Watch Parts Are Model and Size Specific. Please Verify Compatibility Before Purchasing.
- VERIFY YOUR WATCH MODEL & MEASURE THE CORRECT SIZE USING A RULER Watch Parts Are Model and Size Specific. Please Verify Compatibility Before Purchasing.
- Miyota 8215 Movement: Brand new Japanese-made automatic movement with 21 jewels and date at 3 o'clock. Features a ligne size of 11 1/2 (26.0 mm) and a movement height of 5.67 mm, or 7.41 mm with cannon pinion.
- Complete Set Included: Comes with a watch stem, dial holding spacer, and two spare screws. Ideal for replacing or upgrading your watch movement with all necessary components included.
- Precise Measurements: Compatible with your watch by checking the size before purchasing. The Miyota 8215 is designed to fit watches with a movement height of 5.67 mm and a diameter of 26.0 mm.
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