Seiko 4R36: specifications and comparison


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The Seiko 4R36 is one of the most recent movements from the Japanese firm and is also one of the most commonly used in their watches currently.

Called to be the successor of the legendary 7S36, the 4R36 is a technically more advanced caliber in terms of specifications but equally budget-friendly.

An automatic movement that now also integrates the requested functions of hacking seconds and manual winding in line with other current calibers.

In this post, we will take a complete look at the features of the Seiko 4R36 and compare it with other calibers in the same price range to determine its quality.

¡OFER! -7%
Seiko 5 with 4R36 caliber
  • Carcasa de acero inoxidable
  • Correa de metal con cierre desplegable y barra de seguridad con pulsador
  • Cristal Hardlex (cristal mineral endurecido de la superficie)
  • Resistente al agua hasta 100 metros
  • ├ś 43,0 x 13,0 mm

ÔťÜ Seiko 4R36 – Technical specifications

ManufacturerSeiko
OriginJapanese
Model4R36
Year of release2011
MovementAutomatic
Jewels24
Vibration frequency21,600 vph
Power reserve40 hours
Dimensions27.4 mm x 5.32 mm (Diameter x Depth)
Precision+45 ´Ż× -35 seconds per day
FunctionsHour, minutes, and seconds on central hands, and calendar
Hacking secondsYes
Manual windingYes

ÔťÜ 4R36 in detail

The Seiko 4R36 caliber has been on the market since 2011 when it was released to replace the 7S36, one of the most reliable and respected movements from the brand, although somewhat outdated by now.seiko 4r36

In fact, they are very similar in technical terms, but the 4R36 incorporates the requested functions of hacking seconds and manual winding.

Like its predecessor, the 4R36 is an automatic movement with a bidirectional rotor based on the Magic Lever system and Diashock anti-shock protection.

This means it can generate energy when the rotor moves in both directions and is resistant to drops and impacts. It is commonly used in sports and diving watches.

It also beats at 21,600 vph and has 24 jewels, which ensures greater long-term durability with minimal maintenance.

The regulator is based on the Etachron system, allowing for easier adjustment of the balance spring and the possibility of achieving greater precision than what the manufacturer specifies.

Ôץ Precision

Regarding its precision, the official data from the manufacturer indicates +45 ´Ż× -35 sec. / day, although in practice, it often performs much better.

When a manufacturer sets a precision range, it is more of a classification to position the movement, which usually turns out to be more accurate.

Typically, it is more likely to fall within the range of +- 15 sec. per day, but with a little more payment for proper adjustment by a watchmaker, even better values can be achieved.

Keep in mind that these are mass-produced, budget-friendly movements that don’t receive special attention during adjustment, but their design allows for post-adjustment without much complication.

Ôץ Power Reserve

The power reserve is around 40 hours when the mechanism is fully wound, either manually or by the natural movement of the wrist.

Thanks to the manual winding feature, it is possible to keep the watch running even when not wearing it, making this feature highly appreciated among collectors.

Ôץ Watches that use it

The 4R36 is an exclusive movement for Seiko and, therefore, can only be found in watches from the brand, especially in sports and diving models.

In other brands, you may find the NH36, a practically identical variant that Seiko manufactures for third parties, but it is not the 4R36 itself.

You can find this mechanism mainly in divers from the Prospex series, in the sports-oriented 5 Sports line, and in some dressier Presage models.

ÔťÜ Seiko 4R36A and 4R36: What is the difference?

There is no difference as they are the same movement. The letter “A” in Seiko 4R36A simply indicates that it is the first version of the caliber.

If more versions appear in the future (e.g., 4R36B, 4R36C…), there could be differences with the “A” model, as they would be updates to the movement.

ÔťÜ Seiko 4R36 vs NH36

Calibre Seiko NH36

Basically, they are the same mechanism, so there are practically no differences between them. The NH36 is nothing more than the version of the 4R36 that Seiko manufactures for other brands.

As with the Seiko NH35 and the 4R35, the NH36 is just a 4R36 without the Seiko logo and manufactured by one of its subsidiaries: SII (Seiko Instruments Inc).

Model4R36NH36
MovementAutomaticAutomatic
Jewels2424
Vibration frequency21,600 vph21,600 vph
Power reserve40 hours41 hours
Dimensions27.40 x 5.32 mm27.40 x 5.32 mm
Precision35 ´Ż× +45 sec / day-20 ´Ż× +40 sec / day
Hacking secondsYesYes
Manual windingYesYes

The only notable difference between the two is that the NH36 has a better precision rating, although in practice, there may not be a significant difference between the two.

Both movements offer the same adjustment possibilities and in the hands of a skilled watchmaker, they can be equally accurate.

ÔťÜ 4R36 vs 4R35

Watch with Seiko 4R35 caliber

The main difference between these two movements is that the 4R36 displays the day of the week along with the date number.

Apart from that, they are exactly the same, although the 4R35 has one less jewel, which does not affect any other specifications.

Model4R364R35
MovementAutomaticAutomatic
Jewels2423
Vibration frequency21,600 vph21,600 vph
Power reserve40 hours40 hours
Dimensions27.40 x 5.32 mm27.40 x 5.32 mm
Precision35 ´Ż× +45 sec / day35 ´Ż× +45 sec / day
Hacking secondsYesYes
Manual windingYesYes

ÔťÜ 4R36 vs 7S36

Watch with Seiko 7S36 caliber

The most notable difference between these two mechanisms is that the 7S36 is older and does not have the coveted functions of hacking seconds and manual winding.

However, this does not necessarily mean that it is inferior, as being an automatic movement, it does not require manual winding, and stopping the second hand is only relevant for more precise time setting.

The Seiko 7S36 has been one of the most reliable and reputable movements from the brand for years, but the lack of these basic functions makes it somewhat outdated now.

Model4R367S36
MovementAutomaticAutomatic
Jewels2423
Vibration frequency21,600 vph21,600 vph
Power reserve40 hours41 hours
Dimensions27.40 x 5.32 mm27.40 x 4.90 mm
Precision35 ´Ż× +45 sec / day-25 ´Ż× +35 sec / day
Hacking secondsYesNo
Manual windingYesNo

ÔťÜ Seiko 4R36 vs 6R15

The Seiko 6R15 is a movement that belongs to a higher segment, and this is clearly reflected in its technical specifications.calibre 6r15 seiko sumo

On one hand, it has a higher power reserve, and on the other, it operates in a better precision range according to the manufacturer’s classification.

The 6R15 is also slightly more expensive, and thus it is usually found in Seiko watches with higher price points than those with the 4R36.

Model4R366R15
MovimientoAutomaticAutomatic
Joyas2424
Frecuencia de vibraci├│n21.600 vph21.600 vph
Reserva de marcha40 horas50 horas
Dimensiones27,40 x 5,32 mm27,40 x 5,25 mm
Precisi├│n35 ´Ż× +45 seg / d├şa-15 ´Ż× +25 seg / d├şa
Parada de segundosSiSi
Remonte manualSiSi

ÔťÜ Seiko 4R36 vs ETA 2824-2

ETA 2824-2 diagram
As shown in the table, the ETA 2824-2 is vastly superior in all aspects, which is normal considering that it is a Swiss movement and considerably more expensive.

The main difference lies in precision, as the 2824-2 has several levels of adjustment, all of which are superior to the 4R36. In fact, it can be adjusted to chronometer values and meet the COSC certification.

Additionally, it operates at 28,800 vph, which means the second hand moves more smoothly and faster from second to second.

In any case, both are excellent movements, well-known and reliable, each in their respective price segments.

Model4R36ETA 2824-2
MovementAutomaticAutomatic
Jewels2425
Vibration frequency21,600 vph28,800 vph
Power reserve40 hours38 hours
Dimensions27.40 x 5.32 mm25.6 x 4.6 mm
Precision35 ´Ż× +45 sec / day+-12 / +-7 / +-4 sec. day
Hacking secondsYesYes
Manual windingYesYes

ÔťÜ Time and Date Setting

The crown allows for easy adjustments of the time and date, as well as manual winding of the movement.

  • Time: Pull the crown out to the second click (2 clicks), then rotate it clockwise or counterclockwise to set the hands to the desired position.
  • Date: Pull the crown out to the first click (1 click). Turning it counterclockwise adjusts the day of the week, and turning it clockwise adjusts the date.
  • Manual winding: Rotate the crown clockwise without pulling it out.

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Last update of links and images on 2023-11-29.

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