- Manufacturer: Seiko (aka Seiko Instruments, SII)
- Caliber Number: NH36 (aka NH36A)
- Complication: Day & Date
- Movement Type: Automatic
- Diameter: 27.4mm
- Hight: 5.32mm
- Jewels: 24
- Vibrations Per Hour: 21,600 bph (3Hz) (6 beats per second)
- Power Reserve: ~41 hours
- Winding Direction: Bi-directional (Magic Lever)
- White Date & Date Wheel 3:00
Extra Stem Included
* Must Use With NH36 case back, unless you swap the grey spacer for the black 7s26 spacer. All work should be preformed by a professional.
* Compatible with all models that accept 7s26, nh35, nh36, 4r35, 4r36, and all variants of the NH movement family.
Seiko (SII) NH36 Automatic Movement
The Seiko Instruments NH36 Movement is a hand-windable, hacking upgrade from the Seiko caliber 7S26. Seiko Instruments labels the NH caliber movements as part of the Basic Mechanical Series.
Manufacturer: Seiko (aka Seiko Instruments, SII)
12 Ligne = 12 ” / 26 mm
Height with cannon pinion: 7.55mm
Outside diameter: 27.4mm
Casing diameter: 29.36mm including gray spacer
Hand Hole Sizes (HMS): 150/89/21
Date and Day @ 3 o’clock.
Self-winding 21,6000 vibrations per hour
Caliber Number: NH36 (aka NH36A)
Movement Type: Automatic
Vibrations Per Hour: 21,600 bph (3Hz) (6 beats per second)
Power Reserve: ~41 hours
Winding Direction: Bi-directional (Magic Lever)
White Date & Date Wheel 3:00
Extra Stem Included
WHAT IS THE DIFFERENCE BETWEEN THE NH36 AND THE 4R36?
Simple answer? The branding on the oscillating weight (Rotor as some call it). Other than that, they are virtually identical.
“SII” stands for “Seiko Instruments Inc” and is in all technical purposes “Seiko” (Subsidary of Seiko Holdings Corporation).
Seiko SII NH36 is the unbranded version of the Seiko 4R36 movement. Seikos NH36 Movement is known for being a work horse and is the perfect movement to use in a build that will be passed down generation after generation. Most of Seiko’s older watches came with the very popular 7S26, which is the same base movement as the NH36 minus the hand winding, Hacking, and 3 jewel difference. The Day & Date wheels, and the movement spacers on the 7S26[black] and 4R36 (NH36) [gray] are fully interchangeable so don’t worry! This makes upgrading your old worn out 7S26 to a new NH36 very simple.
Hacking, hand winding, and the pure reliability will make this the perfect movement for your next modded Seiko, or even to build a watch from scratch! The SII NH36 movement will fit all the cases being sold on Watch-Modz. Our NH36 Movements pair well with our C3 Lumed Day & Date Wheels which also fit 7S26!
Learn more HERE!