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Seiko Caliber 4r36a Drawing

Seiko Caliber 4R36

Seiko Caliber 4r36a Drawing

Manufacturer Seiko
Caliber Number 4R36, 4R36A
Movement Type Automatic
Diameter
27.4mm (casing 27mm)
Thickness
5.32mm
Jewels 24
Vibrations Per Hour
21,600 bph
Lift Angle
53 degrees
Power Reserve
~40 hours
Hand Windable? Yes
Winding Direction
Clockwise
Hacking? Yes
Anti-Shock System
Seiko Diashock
Regulator System
ETACHRON
Functions Hours, minutes, central seconds, day/date calendar at 3:00
Country of Manufacture Japan
Known Models
(Add yours in the comments below…)

The Seiko caliber 4R36 is an automatic used by Seiko Watch Corp. in their own branded watches. This movement was released circa 2011. This caliber was considered to be an upgrade from the popular 7S36 movement as it offers the user the desirable hacking and hand-winding functionality.

Caliber 4R36 VS SII NH36:

The caliber 4R36 is basically a Seiko-only version of the NH36. Seiko Instruments (aka SII) sells the NH36 to other manufacturers for use in non-Seiko watches.

Caliber 4R36 VS 4R35:

There is also a similar caliber 4R35. The different between the two is that the 4R36 has a day/date calendar complication at 3:00, and the caliber 4R35 only displays the date at 3:00. Everything else is the same, including dimensions, jewels, accuracy, etc.

Differences Between 4R36 and 4R36A?

The A indicates that it is the first generation of this caliber. 4R36 and 4R36A are the same, until Seiko releases a 4R36B which will be a second generation.

Accuracy Rating:

Seiko claims that the accuracy of caliber 4R36 is between +45 / -35 seconds per day. This rating is based on normal daily wear on the wrist in temperatures between 5 ºC and 35 ºC. When testing your watch for timekeeping, make sure it is fully wound.

Crown Position Functions:

0 (against the case): Clockwise = Manual Winding / Counterclockwise = Nothing
1 (pulled out one click): Clockwise = Day setting / Counterclockwise = Date setting
2 (pulled out two clicks): Time setting clockwise and counterclockwise

Stem Removal:

To remove the stem, make sure the crown is in position 0 or normal position (not date or time setting position). There is a lever with a small indentation for your tool. Gently press down while pulling the stem out. See official instructions below for more guidance:

Seiko Caliber 4r36 Stem Removal

Examples of Watches With This Movement:

Here is a Seiko caliber 4R36A in a SARY055:

 

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Is the Seiko Caliber 4R36 any good? Share your opinions, experiences and watches below... Keep comments respectful and follow our community guidelines.

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Seiko Caliber 4R35 Watch Movement | CaliberCorner.com

[…] is also a similar caliber 4R36. The difference between the two is that the 4R35 has a date calendar complication at 3:00, and the […]

Buck
Buck

Exactly the same as a 6R15 movement, except the 6R15 has a SPRON 510 mainspring and SPRON 610 balance spring.

T
T

What does it mean?

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[…] Seiko watches, such as the Next Gen Orange Monster, have since been upgraded to the caliber 4R36, making Seiko collectors happy because the 7S26 seen here does not hack and is not hand-windable […]

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[…] Movement: Seiko Automatic 4R36 […]

Terry L. Mullens
Terry L. Mullens

can this 4R36 movement be swapped into an older SKX175 that currently has a 7S26 movement?

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Seiko (SII) Caliber NH35A Watch Movement | CaliberCorner.com

[…] unbranded version of the Seiko caliber 4R35. for example, the NH36 is an unbranded version of the 4R36 (day + date) found in the Next Generation Orange Monster. More information […]