Royal Oak 37mm Case: Everything to Know Before Buying (2026)
In This Article
Considering the Royal Oak 37mm V2 case? Here's everything you need to know before buying — from specifications and compatible parts to sizing and assembly tips.
Full Specifications
| Spec | Detail |
|---|---|
| Diameter | 37mm |
| Thickness | 11.2mm |
| Material | 316L Stainless Steel |
| Water Resistance | 100M (10 ATM) |
| Crystal | Flat Sapphire with Blue AR |
| Dial Size | 28.5mm |
| Movement | NH35, NH36, NH38, NH70-72, 4R series |
| Bracelet | Integrated with micro-adjust |
| Caseback | Display (exhibition) screw-down |
| Price | $149 |
What's Included
The case ships complete — no hidden costs:
- 37mm case with integrated bracelet
- Flat sapphire crystal (pre-installed)
- Display caseback
- Screw-down crown
- Chapter ring
- Movement spacer + gaskets
You only need to add a movement, dial, and hands.
Compatible Parts
- Dials: Any 28.5mm — Waffle ($29), Skeleton V2 ($40), Sunburst Sector ($39)
- Movements: NH36 ($55), NH35 ($85), NH72 ($95)
- Hands: Royal Oak V2 ($28) in Silver, Gold, Rose Gold
- Spare parts: Caseback ($30), Crown ($30), Screws ($8), Extended Link ($15)
Sizing & Fit
The 37mm case with integrated bracelet fits most wrists. The standard bracelet accommodates wrists from approximately 6" to 7.5". For larger wrists, add extended links ($15 each). The micro-adjust clasp provides fine-tuning for perfect fit.
Build Tips
- Grease the crown and caseback gaskets with silicone before assembly
- Use a dust blower before closing the case — the display caseback makes dust visible
- Don't over-torque the caseback screws
- Test winding and date-change function before wearing
For the full build process, see our 37mm Royal Oak Case guide and complete build guide.
Frequently Asked Questions
Is the 37mm case too small?
37mm is the classic luxury sports watch size — the original AP Royal Oak was 39mm. On most wrists, 37mm looks refined and proportional. The integrated bracelet adds visual presence beyond what the diameter suggests.
Can I swap the bracelet for a strap?
No — the bracelet is integrated (part of the case design). If you want strap options, consider the 41mm Royal Oak which accepts rubber straps.
What's the total build cost?
From $261 (case + NH36 + waffle dial + hands) to $312 (case + NH72 + skeleton dial + hands). Prebuilt options from $290.
Seiko mods page — the full Nomods catalog of prebuilt watches and parts.
Aquanaut mod guide — the Patek-Aquanaut sport-luxury build path.
Tank-style mod — the Cartier-Tank rectangular build path.
Seiko Black Bay mod guide — the vintage-Tudor diver build path.
Read More
- 37mm Royal Oak Case: Complete Guide
- Seiko Royal Oak Mods: Build & Buy
- Build Your Own Custom Seiko Watch
- Shop Royal Oak Collection
Nomods is not affiliated with Audemars Piguet. "Royal Oak" is used descriptively. All watches are independently built using Seiko-compatible movements.
