Assemble Watches
How to Plan an NH35 Build
To plan an NH35 build, you need to select a compatible case, dial (with NH35-spec dial feet), hands (with correct tube sizes for the NH35 pinion), bezel ring and insert, crystal, and bracelet or strap. Assemble Watches checks compatibility across all of these as you go.
- What parts do I need for an NH35 build?
- A complete NH35 build needs: a case (NH35-compatible footprint), NH35 movement, dial (NH35 dial feet), hands (NH35 tube sizes), bezel ring, bezel insert, crystal (matched to case diameter), caseback, and bracelet or strap (matched to lug width). Assemble Watches lists all of these and checks compatibility between them.
- What is the NH35 movement?
- The NH35 is a Seiko SII automatic movement and the most popular choice for Seiko mods. It hacks (stops when you pull the crown), hand-winds, and runs at 21,600 bph. It shares a footprint with the older 7s26, so it fits any SKX007-spec case. The NH36 is identical but adds a day display alongside the date.
- What dial feet compatibility do I need for an NH35 build?
- NH35 dials use a specific dial feet pattern. Most aftermarket dials sold as 'NH35 compatible' or 'SKX007 compatible' will fit correctly. Confirm with the vendor rather than assuming — incorrect dial feet mean the dial won't seat properly on the movement.
- How do I check NH35 hand compatibility?
- NH35 hands have specific inner tube diameters for the hour, minute, and seconds tubes. Most aftermarket hands listed as NH35-compatible will be correct, but verify the inner diameters with the vendor if you're sourcing from less-documented suppliers.
- How do I use Assemble Watches to plan an NH35 build?
- Open the builder at assemble.watch/build, select your case, then add an NH35 movement. As you add dials, hands, and bezel parts, the builder checks compatibility automatically and flags any issues. When you're done, export the parts list with vendor links.
- What is the difference between NH35 and NH36 for a mod build?
- Both use the same case footprint, dial feet positions, and hand tube sizes. The NH36 adds a day wheel, which requires a dial with a day/date window rather than a date-only window. For most mod builds, either movement works with the same parts — just ensure your dial matches the movement's display type.