Seiko Mechanical
Most Seiko Mechanical references take a 20 mm watch strap: 5 of 10.
Seiko Mechanical lug width by case size
10 references measured. Updated 2026-10-29.
| Case | Lug width | References | Watch strap attachment | For example |
|---|---|---|---|---|
| 38 mm | 20 mm | 2 | — | SARB033, SARB035 |
| 40 mm | 20 mm | 2 | — | SARB017, SARB065 |
| 42 mm | 22 mm · 20 mm on 1 | 6 | — | SKX007K1, SKX007K1, SKX007K2 |
References that take a different watch strap
- SRPA29: 20 mm, not the 22 mm of most 42 mm cases
Every Seiko Mechanical reference
- Mechanical Alpinist Stainless Steel / Green / StrapSARB017
20 mm - Mechanical Stainless Steel / Black / BraceletSARB033
20 mm - Mechanical Stainless Steel / Silver / BraceletSARB035
20 mm - Cocktail Time Ishigaki Shinobu Stainless Steel / Ice Blue / Strap / CoolSARB065
20 mm - Mechanical SKX007K1SKX007K1
22 mm - SKX007 Black / Stainless Steel / RubberSKX007K1
22 mm - Mechanical SKX007K2SKX007K2
22 mm - SKX007 Black / Stainless SteelSKX007K2
22 mm - SKX009 Black / Stainless SteelSKX009K2
22 mm - Mechanical Stainless Steel / Blue / BraceletSRPA29
20 mm
Other Seiko families
Inside each one the lug width often changes: it is the reference that decides.
- 5 Sports 118
- Presage 101
- Prospex 85
- Prospex Divers 83
- King Seiko 21
- Prospex Sky 21
- Astron 19
- Prospex Land 17
- Alpinist 15
- Coutura 7
- Essentials 7
All Seiko families → · Why the size changes inside a family →