Will this fit in a SKX007?

Yes, but you'll need to use a different stem and crown. If you go online, look for "Seiko purist stem crown", it should be a whole assembly. I got mine on e(vil)Bay for forty bucks shipped. Works right off the bat, no fiddling around. Otherwise you can use the included stem and add a crown, but may have to fit it by hand to ensure water tightness.

Can the crown position be adjusted to 4 o’clock or no?

You have to swap out the day wheel for one that sits at 4 o clock. Date wheel stays the same. easy swap

will it fit a 42.5 mm case?

Yes. You just need the proper spacer for the case. I’ve installed this in an SNZH57 (42-43mm case) and simply had to take the spacer off the original 7S36 mvmt to put on this new NH36. Same with an SNKK27 (38mm case) - take spacer from 7S26. I’ve also installed in an aftermarket SKX013 (38mm case) and the case was made to take the spacer that this NH36 comes with.

Is this movement regulated?

This movement supplied is regulated.

Genuine Compatible With Seiko Sii Nh36 Nh36a Movement Automatic Day

Description

⚙️ Elevate your timepiece with precision that professionals trust!

PRECISION UPGRADE - Experience Seiko-grade NH36A movement accuracy within 3 seconds per day.
TRUSTED RELIABILITY - Built to original factory specs, delivering durable performance and peace of mind.
ENHANCED FUNCTIONALITY - Hackable second hand and manual winding for ultimate control and convenience.
SEAMLESS COMPATIBILITY - Custom-fit for Seiko (SII) NH36/NH36A movements to ensure flawless installation.
COST EFFECTIVE EXCELLENCE - Upgrade your watch movement at a fraction of overhaul costs without compromising quality.

The Ewatchparts Genuine Compatible NH36/NH36A movement is a premium automatic day-date mechanism designed to fit Seiko watches perfectly. Offering superior accuracy (±3 seconds/day), hackable functionality, and manual winding, it provides a cost-effective upgrade to standard movements, built to original factory specifications for reliable, long-lasting performance.

Reviews

O**A

Nice movement

Really nice movement

27.02.2026

D**C

Seiko quality for inexpensive price.

I have a Seiko SKX007 dive watch with a 7S26 movement that became very inaccurate. The 7S26 is basically a "disposable" movement since it costs more to overhaul it than to buy a new one. I upgraded to the higher grade NH36A which Seiko's "unbranded" 4R36 movement used in more expensive watches. The movement plus installation by a watch maker cost less than the cost of overhauling the 7S26. It is accurate to within 3 seconds a day and is hackable (second hand stops with stem is pulled out) and can be stem-wound. Neither of those features is present on the 7S26.

8.05.2019

P**S

As expected, just needed to be adjusted.

Bought it so that I could upgrade the movement on my Seiko Sea Urchin (SNZF21) - the only complaint that I have is that when I received it, it was running about 45 seconds fast per day. I am comfortable adjusting it, so after tinkering with it for a few days I got it at -14 seconds per day which is fine for now, I may try to get it closer to 0 but I can live with it.

12.02.2026

O**S

Accurate and fit perfectly

I can't believe how expensive these have gotten. It wasn't long ago that this was a $25 movement all day, but I guess times have changed. Anyway, one of my favorite builds was running waaaay fast, so I wanted to replace the movement so I could get it back in rotation and I'll figure out what is going on with the other one later. Probably magnetized. Easy to fix. 10 minutes after I took the caseback off I was screwing it back down again and the build was complete. It has been keeping excellent time. Only the standard couple seconds off per day for the last month or two since I popped it in. I guess maybe I should stock up in case the price on these doubles again or something....

21.09.2024

E**N

Broken stem

Arrived with a broken stem! Good thing I have gotten good taking the nh35/36 apart….

28.01.2026

B**.

Better than expected.

I was concerned that this may not keep time well. I used this to upgrade my skx007j and it works perfectly. Time runs about +3 to 5 seconds per day. I've been using the watch for several weeks now and it's very consistent. I would highly recommend.

28.01.2020

A**D

A great calibre for the watch modders

7.08.2025

B**R

Swapped out my SKX's movement perfectly!

Used this to replace the 7S26 in my SKX, I even used the stem that came with it. Just grasp the flats of the stem with foreceps and unscrew the plastic placeholder crown, then cut to the correct length and screw in your replacement crown. This saved me when I cut my replacement stem a hair too short! I did swap out the gray spacer for the black one although I heard it can still fit in the SKX case without issue.

13.03.2020

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Clasp type	Tang Buckle
Item type name	Watch movement
Metal type	Alloy Steel

Genuine Compatible With Seiko (Sii) NH36 NH36A Movement Automatic Day Date 3 White Date

Description

Specifications

Reviews

Common Questions