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Seiko 5 Sports

Most Seiko 5 Sports references take a 22 mm watch strap: 64 of 118. The lug width follows the case size: 32 mm case → 15 mm, 39 mm case → 20 mm, 42 mm case → 22 mm and 43 mm case → 22 mm.

Shop 18 mmShop 20 mmShop 22 mm

Seiko 5 Sports lug width by case size

118 references measured. Updated 2026-10-29.

CaseLug widthReferencesWatch strap attachmentFor example
28 mm14 mm2—SRE003, SRE004
32 mm15 mm3—SRE021, SRE023, SRE024
39 mm20 mm3—SSK023, SSK025, SSK059
42 mm22 mm · 20 mm on 1127—SRPD51K1, SRPD53K1, SRPD55K1
43 mm22 mm · 20 mm on 732—SBSA281, SBSA315, SRPD51K1
not recorded22 mm · 20 mm on 19 · 18 mm on 7 · 14 mm on 251—SRPD93, SRPE74, SRPE77

References that take a different watch strap

  • SNZF15K1: 20 mm, not the 22 mm of most 42 mm cases
  • SRPD51K2: 20 mm, not the 22 mm of most 42 mm cases
  • SRPD55K2: 20 mm, not the 22 mm of most 42 mm cases
  • SRPD55K3: 20 mm, not the 22 mm of most 42 mm cases
  • SRPD65K2: 20 mm, not the 22 mm of most 42 mm cases
  • SRPD65K3: 20 mm, not the 22 mm of most 42 mm cases
  • SRPD65K4: 20 mm, not the 22 mm of most 42 mm cases
  • SRPD69K1: 20 mm, not the 22 mm of most 42 mm cases
  • SRPD81K1: 20 mm, not the 22 mm of most 42 mm cases
  • SRPD83K1: 20 mm, not the 22 mm of most 42 mm cases
  • SRPD85K1: 20 mm, not the 22 mm of most 42 mm cases
  • SRPD65K2: 20 mm, not the 22 mm of most 43 mm cases
  • SRPD65K3: 20 mm, not the 22 mm of most 43 mm cases
  • SRPD65K4: 20 mm, not the 22 mm of most 43 mm cases
  • SRPD69K1: 20 mm, not the 22 mm of most 43 mm cases
  • SRPD81K1: 20 mm, not the 22 mm of most 43 mm cases
  • SRPD83K1: 20 mm, not the 22 mm of most 43 mm cases
  • SRPD85K1: 20 mm, not the 22 mm of most 43 mm cases
  • SBSA199: 18 mm
  • SBSC009: 20 mm
  • SRE005: 14 mm
  • SRE006: 14 mm
  • SRPE51: 20 mm
  • SRPE53: 20 mm

And 22 more in the full list below.

Questions about the Seiko 5 Sports

Can two Seiko 5 Sports watches with a 43 mm case take different watch straps?

Yes. Of the 32 Seiko 5 Sports references with a 43 mm case, 25 take 22 mm and 7 take 20 mm. The reference number decides, not the case size alone.

Every Seiko 5 Sports reference

Other Seiko families

Inside each one the lug width often changes: it is the reference that decides.

All Seiko families → · Why the size changes inside a family →