Everything you need to know about the Seiko NH35 automatic movement
The Seiko NH35 movement is one of the most popular automatic calibers on the watch market today. Appreciated for its robustness, precision, and ease of maintenance , it is used by many brands, including in the world of SeikoMod . In this article, we will explore in detail its characteristics, its advantages over other calibers, and how it powers most of our custom watches . 
What is the Seiko NH35 automatic movement?
The Seiko NH35 is an automatic caliber developed by Seiko Instruments Inc. (SII) , a subsidiary of the Japanese giant Seiko. It is based on the Seiko 4R35 , a movement used in the brand's models, but intended for third-party manufacturers and independent watchmakers.
Main technical characteristics
- Movement type : Automatic with manual winding
- Frequency : 21,600 vibrations per hour (6 beats per second)
- Power reserve : Approximately 41 hours
- Number of rubies : 24
- Accuracy : Between -20 and +40 seconds per day
- Functions : Hour, minute, second, date with second stop (hacking)
Reliability and maintenance
One of the major strengths of the Seiko NH35 is its durability . Designed to be robust and easy to maintain , it is ideal for diving watches and custom watches. Unlike other more complex calibers, it requires minimal maintenance , typically adjustment or lubrication every 3 to 5 years .
Comparison with other calibers
The Seiko NH35 is often compared to other popular automatic movements like the ETA 2824-2 or the Miyota 8215. Here's a quick comparison:
| Characteristic | Seiko NH35 | ETA 2824-2 | Miyota 8215 |
|---|---|---|---|
| Frequency | 21,600 A/h | 28,800 A/h | 21,600 A/h |
| Power reserve | 41 hours | 38 hours | 42 hours |
| Hacking (second stop) | Yes | Yes | No |
| Manual winding | Yes | Yes | Yes |
| Average price | $$ | $$$$ | $$ |
Official sources: seikowatches.com
The ETA 2824-2 is more premium, with a higher frequency and better accuracy, but comes at a much higher price. The Miyota 8215 , often used in affordable watches, lacks a stop-seconds function, which is a disadvantage for some users.
Why choose a watch equipped with the Seiko NH35?
1. Affordable and efficient alternative:
The NH35 offers excellent quality for its price , making automatic watches more accessible to watch enthusiasts.
2. A caliber widely adopted in personalized watches:
Independent watchmakers and watch modding enthusiasts use the Seiko NH35 to create unique watches. Its compatibility with a wide range of cases and dials makes it an ideal choice for customization projects.
3. Proven reliability:
Unlike lesser quality Chinese movements, the NH35 is proven and built to last . 
Our watches equipped with the Seiko NH35
In our workshop, we offer several models of automatic watches equipped with the Seiko NH35 , combining high-end design and reliability . Discover our flagship models:
- SeikoMod Nautilus – Elegance and Modernity
- SeikoMod Royal Oak – Watchmaking Icon Revisited
-
SeikoMod Datejust – Robustness and performance
Conclusion
The Seiko NH35 automatic movement is now a must-have for those looking for a reliable and affordable automatic watch . Its success in the SeikoMod world is a testament to its versatility and durability . If you are looking for a watch equipped with this iconic caliber, take a look at our online store
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