Miyota 9015 vs NH35 – Which Movement Should Power Your Mod?

Miyota 9015 vs NH35 in short: the 9015 is the thinner, faster-beating movement. It is 3.90 mm high against 5.32 mm for the NH35A, runs at 28,800 instead of 21,600 vibrations per hour, and Miyota publishes a narrower factory tolerance for it: −10 to +30 seconds per day, where TMI states −20 to +40 for the NH35A, each under its own measurement conditions. Both have 24 jewels, automatic and hand winding, stop seconds and a date. The Miyota 8215 shares the NH35A’s frequency and published accuracy range but is thicker at 5.67 mm. Choose the calibre together with a case, dial and hand set that fit it.

For other Miyota calibres, see the Miyota movement guide.

Published specifications

The tolerances are manufacturer values under different measurement contexts. MIYOTA's current listing names stop seconds for the 8215; that does not establish the function for every older version.

Which parts actually fit?

Start with the case and dial, then confirm the movement holder, dial feet, calendar opening, hand fittings, stem and crystal clearance together. A part described as a mod part is not evidence that it fits all three calibres. Movement height is useful screening data, not a complete compatibility result.

For a ready-made watch, ask for the exact calibre and version. For a build, obtain the relevant supplier drawings and a full compatibility list for the parts being used.

Price, service and practical choice

Compare current offers for the same movement version and included components. Add the actual parts, assembly and testing needed. Ask the watchmaker for their rate for that work and which parts, assembly, testing and support are included in the quote.

All three calibres have a date. NH35A and 8215 share the same frequency and published accuracy range but have different dimensions; 9015 is thinner and runs at a higher frequency. The actual parts must fit together, and the finished watch’s rate needs its own measurement.

MARINER MOD - BLACK is a MedoMods model specified with NH35, giving a concrete NH35 alternative to inspect.

The NH35 model overview shows date movements in finished watches. If you also need the weekday, see the NH35 vs NH36 calendar comparison. For a custom build, the configurator shows the available options.

FAQ

What is the difference between the Miyota 9015 and the NH35?

The Miyota 9015 is 3.90 mm high and runs at 28,800 vibrations per hour; the NH35A is 5.32 mm high and runs at 21,600. Miyota publishes −10 to +30 seconds per day for the 9015, TMI −20 to +40 for the NH35A, each under its own measurement conditions. Both have 24 jewels, automatic and hand winding, stop seconds and a date.

Is the Miyota 9015 more accurate than the NH35?

Miyota publishes a narrower factory tolerance for the 9015, but that is not a timing guarantee for two particular finished watches. Compare documented measurements under their stated conditions.

Is the Miyota 8215 a bad movement?

No. A calibre name alone is not a quality verdict. Compare the actual watch, the current movement version, the published functions and support for your planned build.

Can I transfer NH35 dials and hands to a Miyota build?

Not automatically. Check drawings, dial feet, hand fittings, calendar opening, case, movement holder and clearance for the exact component combination.

Will regulation make every NH35 equally accurate?

No. Regulation adjusts the rate of the individual movement but does not make all NH35 movements equally accurate. Compare its rate before and after adjustment under the same measurement conditions.

Sources

• TMI NH0/NH3 product line, checked 9 October 2026.
• TMI Cal. NH3 Technical Guide, Version 03, checked 9 October 2026.
• TMI NH35A specification and drawing, checked 9 October 2026.
• MIYOTA 8215 product page, checked 9 October 2026.
• MIYOTA 8215 specification, checked 9 October 2026.
• MIYOTA 9015 specification, checked 9 October 2026.