Assemble Watches
How to Check Seiko Mod Part Compatibility
To check Seiko mod part compatibility, verify: (1) dial feet match your movement, (2) hand tube sizes match the movement pinion posts, (3) crystal diameter matches the case exactly, (4) bezel ring fits your case, and (5) lug width matches your bracelet. Assemble Watches automates all of these checks as you select parts.
- What compatibility checks matter most for a Seiko mod?
- The most important checks are movement-to-dial, movement-to-hands, case-to-crystal, case-to-bezel, case-to-crown, and case-to-bracelet or strap. Dial feet and hand sizes decide whether the movement can be assembled. Crystal, bezel, and bracelet dimensions decide whether the watch case can be closed and worn correctly.
- How do I check if a dial is compatible with the NH35?
- Look for a dial listed as NH35-compatible, NH36-compatible, or SKX-compatible, then check the dial diameter and aperture. NH35 date dials need a date window at 3 o'clock or no date window at all. If the dial is day-date, open-heart, skeleton, or GMT-specific, match it to the movement type rather than assuming it works.
- How do I check crystal compatibility for a Seiko mod case?
- Crystal compatibility comes from the case specification, not the movement. Check the exact outer diameter, thickness, and profile supported by the case. Crystals are often measured in tenths of a millimetre, and a tiny mismatch can prevent the crystal from seating or holding pressure.
- Are SKX007 and SRPD parts compatible with each other?
- Some SKX007 and SRPD parts overlap, but not every part is interchangeable. Dials, hands, and many inserts are often shared across the ecosystem. Case-specific parts such as crystals, crowns, bezels, and fitted bracelets need explicit confirmation from the vendor.
- Can I check Seiko mod compatibility without buying parts first?
- Yes. Assemble Watches lets you choose parts in the browser and checks major compatibility rules before you order anything. It is not a replacement for reading vendor dimensions, but it catches many common planning mistakes early, when fixing them is still free.