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Strap size by lug width

20 mm lug width watches

63 watches in our base take a 20 mm strap (56 Seiko, 3 Zelos, 2 Vostok-Europe, 1 Citizen, 1 Dan Henry), with cases of 38–44 mm and 43.6–49.3 mm lug to lug. Integrated bracelets and proprietary straps are not listed: they take no standard 20 mm strap.

Sources checked · How we source numbers
20 mm strap: strap diagramTwo-piece strap laid flat (20 mm strap). Lug width 20 mm. Short piece — (unknown), long piece — (unknown). Buckle, keepers and holes are schematic.short —long —lug 20lug 20strap length —20 mm strap
20 mm at the lugs; lengths depend on the wristDrawing from data, not a photo · mm

Watches with 20 mm lugs

Each lug width below comes from a cited source; the model page has every size.

Silhouettes from the published sizes, shortest first, all to one scale; the bar and each grid square are 10 mm. Not photos.

Show the specs table · 63 models, every number with its source
  • Citizen Promaster Diver BN0150-28E

    Promaster · Citizen E168 (Eco-Drive) · quartz (analog)

    Case
    44 mm1
    Lug to lug
    not published
    Thickness
    11.5 mm2measured
    Lug width
    20 mm1
  • Dan Henry 1962 Racing Chronograph Black

    Quartz (analog) models · TMI VK63 · quartz (analog)

    Case
    39 mm3
    Lug to lug
    45.9 mm3
    Thickness
    13.5 mm3
    Lug width
    20 mm3
  • Seiko SARB017

    Prospex · Seiko 6R15 · automatic

    Case
    38 mm4seller listing
    3 sources disagree; show every value
    • seller listing 38 mm4
    • secondary source 39.5 mm5
    • secondary source 39 mm6
    Lug to lug
    not published
    Thickness
    12 mm4seller listing
    Lug width
    20 mm4seller listing
  • Seiko SBDC091

    Automatic models · Seiko 6R35 · automatic

    Case
    39.5 mm7seller listing
    Lug to lug
    46.5 mm7seller listing
    Thickness
    13 mm7seller listing
    Lug width
    20 mm7seller listing
  • Seiko Marinemaster 1968 Heritage Diver's Watch

    Automatic models · Seiko 8L35 · automatic

    Case
    42.6 mm8
    Lug to lug
    49.3 mm8
    Thickness
    13.4 mm8
    Lug width
    20 mm8
  • Seiko Marinemaster 1968 Heritage Diver's Watch

    Automatic models · Seiko 8L35 · automatic

    Case
    42.6 mm9
    Lug to lug
    49.3 mm9
    Thickness
    13.4 mm9
    Lug width
    20 mm9
  • Seiko SPB121

    Automatic models · Seiko 6R35 · automatic

    Case
    39.5 mm10seller listing
    Lug to lug
    46.5 mm10seller listing
    Thickness
    13 mm10seller listing
    Lug width
    20 mm7seller listing
  • Seiko SPB155

    Prospex · Seiko 6R35 · automatic

    Case
    38 mm11
    Lug to lug
    46 mm11
    Thickness
    12.9 mm11
    Lug width
    20 mm11
  • Seiko SPB157

    Prospex · Seiko 6R35 · automatic

    Case
    38 mm12
    Lug to lug
    46 mm12
    Thickness
    12.9 mm12
    Lug width
    20 mm12
  • Seiko SPB159

    Prospex · Seiko 6R35 · automatic

    Case
    38 mm13
    Lug to lug
    46 mm13
    Thickness
    12.9 mm13
    Lug width
    20 mm13
  • Seiko SPB165

    Presage · Seiko 6R35 · automatic

    Case
    39.3 mm14
    Lug to lug
    47.2 mm14
    Thickness
    11.1 mm14
    Lug width
    20 mm14
  • Seiko SPB169

    Presage · Seiko 6R35 · automatic

    Case
    39.3 mm15
    Lug to lug
    47.2 mm15
    Thickness
    11.1 mm15
    Lug width
    20 mm15
  • Seiko SPB209

    Prospex · Seiko 6R35 · automatic

    Case
    39.5 mm16
    Lug to lug
    46.4 mm16
    Thickness
    13.2 mm16
    Lug width
    20 mm16
  • Seiko SRPB41

    Presage · Seiko 4R35 · automatic

    Case
    40.5 mm17
    Lug to lug
    not published
    Thickness
    11.8 mm17
    Lug width
    20 mm17
  • Seiko SRPB43

    Presage · Seiko 4R35 · automatic

    Case
    40.5 mm18
    Lug to lug
    not published
    Thickness
    11.8 mm18
    Lug width
    20 mm18
  • Seiko SRPB46

    Cocktail Time · Seiko 4R35 · automatic

    Case
    40.5 mm19
    Lug to lug
    not published
    Thickness
    11.8 mm19
    Lug width
    20 mm19
  • Seiko SRPB49

    Prospex · Seiko 4R35 · automatic

    Case
    44 mm20seller listing
    Lug to lug
    not published
    Thickness
    13 mm20seller listing
    Lug width
    20 mm20seller listing
  • Seiko SRPB77

    Cocktail Time · Seiko 4R35 · automatic

    Case
    40.5 mm21seller listing
    Lug to lug
    not published
    Thickness
    12 mm21seller listing
    Lug width
    20 mm21seller listing
  • Seiko SRPD37

    Cocktail Time · Seiko 4R35 · automatic

    Case
    40.5 mm22
    Lug to lug
    47.5 mm22
    Thickness
    11.8 mm22
    Lug width
    20 mm22
  • Seiko SRPD97

    Presage · Seiko 4R35 · automatic

    Case
    38.3 mm23
    Lug to lug
    43.6 mm23
    Thickness
    11.2 mm23
    Lug width
    20 mm23
  • Seiko SRPE15

    Cocktail Time · Seiko 4R35 · automatic

    Case
    40.5 mm24
    Lug to lug
    47.5 mm24
    Thickness
    11.8 mm24
    Lug width
    20 mm24
  • Seiko SRPE17

    Automatic models · Seiko 4R35 · automatic

    Case
    40.5 mm25seller listing
    Lug to lug
    not published
    Thickness
    12 mm25seller listing
    Lug width
    20 mm25seller listing
  • Seiko SRPE19

    Cocktail Time · Seiko 4R35 · automatic

    Case
    40.5 mm26
    Lug to lug
    47.5 mm26
    Thickness
    11.8 mm26
    Lug width
    20 mm26
  • Seiko SRPE41

    Cocktail Time · Seiko 4R35 · automatic

    Case
    38.5 mm27
    Lug to lug
    45.4 mm27
    Thickness
    11.8 mm27
    Lug width
    20 mm27
  • Seiko SRPE43

    Cocktail Time · Seiko 4R35 · automatic

    Case
    38.5 mm28
    Lug to lug
    45.4 mm28
    Thickness
    11.8 mm28
    Lug width
    20 mm28
  • Seiko SRPE45

    Presage · Seiko 4R35 · automatic

    Case
    38.5 mm29
    Lug to lug
    45.4 mm29
    Thickness
    11.8 mm29
    Lug width
    20 mm29
  • Seiko SRPE51

    5 Sports · Seiko 4R36 · automatic

    Case
    40 mm30
    Lug to lug
    44.6 mm30
    Thickness
    11.5 mm30
    Lug width
    20 mm30
  • Seiko SRPE53

    5 Sports · Seiko 4R36 · automatic

    Case
    40 mm31
    Lug to lug
    44.6 mm31
    Thickness
    11.5 mm31
    Lug width
    20 mm31
  • Seiko SRPE55

    5 Sports · Seiko 4R36 · automatic

    Case
    40 mm32
    Lug to lug
    44.6 mm32
    Thickness
    11.5 mm32
    Lug width
    20 mm32
  • Seiko SRPE57

    5 Sports · Seiko 4R36 · automatic

    Case
    40 mm33
    Lug to lug
    44.6 mm33
    Thickness
    11.5 mm33
    Lug width
    20 mm33
  • Seiko SRPE61

    5 Sports · Seiko 4R36 · automatic

    Case
    40 mm34
    Lug to lug
    44.6 mm34
    Thickness
    11.5 mm34
    Lug width
    20 mm34
  • Seiko SRPE65

    5 Sports · Seiko 4R36 · automatic

    Case
    40 mm35
    Lug to lug
    44.6 mm35
    Thickness
    11.5 mm35
    Lug width
    20 mm35
  • Seiko SRPE67

    5 Sports · Seiko 4R36 · automatic

    Case
    40 mm36
    Lug to lug
    44.6 mm36
    Thickness
    11.5 mm36
    Lug width
    20 mm36
  • Seiko SRPE69

    5 Sports · Seiko 4R36 · automatic

    Case
    40 mm37
    Lug to lug
    44.6 mm37
    Thickness
    11.5 mm37
    Lug width
    20 mm37
  • Seiko SRPF41

    Presage · Seiko 4R35 · automatic

    Case
    38.5 mm38
    Lug to lug
    45.4 mm38
    Thickness
    11.8 mm38
    Lug width
    20 mm38
  • Seiko SRPF53

    Presage · Seiko 4R35 · automatic

    Case
    41.7 mm39seller listing
    Lug to lug
    not published
    Thickness
    12 mm39seller listing
    Lug width
    20 mm39seller listing
  • Seiko SRPG03

    Presage · Seiko 4R35 · automatic

    Case
    40.8 mm40
    Lug to lug
    47 mm40
    Thickness
    12 mm40
    Lug width
    20 mm40
  • Seiko SRPG07

    Presage · Seiko 4R35 · automatic

    Case
    40.8 mm41
    Lug to lug
    47 mm41
    Thickness
    12 mm41
    Lug width
    20 mm41
  • Seiko SRPG09

    Presage · Seiko 4R35 · automatic

    Case
    40.8 mm42
    Lug to lug
    47 mm42
    Thickness
    12 mm42
    Lug width
    20 mm42
  • Seiko SRPG27

    5 Sports · Seiko 4R36 · automatic

    Case
    39.4 mm43
    Lug to lug
    48.1 mm43
    Thickness
    13.2 mm43
    Lug width
    20 mm43
  • Seiko SRPG29

    5 Sports · Seiko 4R36 · automatic

    Case
    39.4 mm44
    Lug to lug
    48.1 mm44
    Thickness
    13.2 mm44
    Lug width
    20 mm44
  • Seiko SRPG31

    5 Sports · Seiko 4R36 · automatic

    Case
    39.4 mm45
    Lug to lug
    48.1 mm45
    Thickness
    13.2 mm45
    Lug width
    20 mm45
  • Seiko SRPG33

    5 Sports · Seiko 4R36 · automatic

    Case
    39.4 mm46
    Lug to lug
    48.1 mm46
    Thickness
    13.2 mm46
    Lug width
    20 mm46
  • Seiko SRPG35

    5 Sports · Seiko 4R36 · automatic

    Case
    39.4 mm47
    Lug to lug
    48.1 mm47
    Thickness
    13.2 mm47
    Lug width
    20 mm47
  • Seiko SRPG37

    5 Sports · Seiko 4R36 · automatic

    Case
    39.4 mm48
    Lug to lug
    48.1 mm48
    Thickness
    13.2 mm48
    Lug width
    20 mm48
  • Seiko SRPG39

    5 Sports · Seiko 4R36 · automatic

    Case
    39.4 mm49
    Lug to lug
    48.1 mm49
    Thickness
    13.2 mm49
    Lug width
    20 mm49
  • Seiko SRPG41

    5 Sports · Seiko 4R36 · automatic

    Case
    39.4 mm50
    Lug to lug
    48.1 mm50
    Thickness
    13.2 mm50
    Lug width
    20 mm50
  • Seiko SRPH29

    5 Sports · Seiko 4R36 · automatic

    Case
    39.4 mm51
    Lug to lug
    48.1 mm51
    Thickness
    13.2 mm51
    Lug width
    20 mm51
  • Seiko SRPH31

    5 Sports · Seiko 4R36 · automatic

    Case
    39.4 mm52
    Lug to lug
    48.1 mm52
    Thickness
    13.2 mm52
    Lug width
    20 mm52
  • Seiko SRPH33

    5 Sports · Seiko 4R36 · automatic

    Case
    39.4 mm53
    Lug to lug
    48.1 mm53
    Thickness
    13.2 mm53
    Lug width
    20 mm53
  • Seiko SSA343

    Presage · Seiko 4R57 · automatic

    Case
    40.5 mm54
    Lug to lug
    not published
    Thickness
    14.4 mm54
    Lug width
    20 mm54
  • Seiko SSA345

    Presage · Seiko 4R57 · automatic

    Case
    40 mm55seller listing
    Lug to lug
    not published
    Thickness
    12 mm55seller listing
    Lug width
    20 mm55seller listing
  • Seiko SSA347

    Presage · Seiko 4R57 · automatic

    Case
    40.5 mm56
    Lug to lug
    not published
    Thickness
    14.4 mm56
    Lug width
    20 mm56
  • Seiko SSA405

    Presage · Seiko 4R38 · automatic

    Case
    40.5 mm57
    Lug to lug
    47.5 mm57
    Thickness
    11.8 mm57
    Lug width
    20 mm57
  • Seiko SSA425

    Presage · movement not published

    Case
    40.8 mm58
    Lug to lug
    47 mm58
    Thickness
    12.8 mm58
    Lug width
    20 mm58
  • Seiko SSA457

    Presage · movement not published

    Case
    40.5 mm59
    Lug to lug
    47.5 mm59
    Thickness
    11.6 mm59
    Lug width
    20 mm59
  • Seiko SSK059

    5 Sports · Seiko 4R34 · automatic

    Case
    39.4 mm60
    Lug to lug
    47.9 mm60
    Thickness
    13.6 mm60
    Lug width
    20 mm60
  • Seiko SUR373

    Discover More · movement not published

    Case
    40.2 mm61
    Lug to lug
    47 mm61
    Thickness
    8.4 mm61
    Lug width
    20 mm61
  • Vostok-Europe Undiné VK64-515B568

    Quartz (analog) models · TMI VK64 · quartz (analog)

    Case
    39 mm62
    Lug to lug
    48 mm62
    Thickness
    13.5 mm62
    Lug width
    20 mm62
  • Vostok-Europe Undiné VK64-515E628

    Quartz (analog) models · TMI VK64 · quartz (analog)

    Case
    39 mm63
    Lug to lug
    48 mm63
    Thickness
    13.5 mm63
    Lug width
    20 mm63
  • Zelos Aurora Field 38mm Ti Aventurine

    Automatic models · Miyota 9039 · automatic

    Case
    38 mm64
    Lug to lug
    46 mm64
    Thickness
    12 mm64
    Lug width
    20 mm64
  • Zelos Helmsman SS Meteorite

    Automatic models · Miyota 9015 · automatic

    Case
    40 mm65
    Lug to lug
    46.5 mm65
    Thickness
    12.5 mm65
    Lug width
    20 mm65
  • Zelos Thresher 41mm Dusk

    Automatic models · Miyota 9075 · automatic

    Case
    41 mm66
    Lug to lug
    47 mm66
    Thickness
    12.7 mm66
    Lug width
    20 mm66

Choosing a 20 mm strap

Strap and spring bars
20 mm wide at the lug end; spring bars for a 20 mm gap.
Case thickness here
8.4–14.4 mm
Wrists that suit them
balanced from ~15.5 cm (shortest, 43.6 mm) to ~17.5 cm (longest, 49.3 mm); flat-fit estimate

A 19 mm strap leaves a visible gap between the lugs and a 21 mm one has to be forced in, so buy the exact width. The figures in the cards above are the ranges of the 63 models listed here, not a rule for every 20 mm watch. Work out your strap length in the watch strap size tool.

Other lug widths

All watches with sizes

20 mm lug width questions

Which watches have a 20 mm lug width?

Seiko: SARB017, SBDC091, SLA077J1, SLA079J1, SPB121, SPB155, SPB157, SPB159, SPB165, SPB169, SPB209, SRPB41, SRPB43, SRPB46, SRPB49, SRPB77, SRPD37, SRPD97, SRPE15, SRPE17, SRPE19, SRPE41, SRPE43, SRPE45, SRPE51, SRPE53, SRPE55, SRPE57, SRPE61, SRPE65, SRPE67, SRPE69, SRPF41, SRPF53, SRPG03, SRPG07, SRPG09, SRPG27, SRPG29, SRPG31, SRPG33, SRPG35, SRPG37, SRPG39, SRPG41, SRPH29, SRPH31, SRPH33, SSA343, SSA345, SSA347, SSA405, SSA425, SSA457, SSK059, SUR373. Zelos: Aurora Field 38 Aventurine, Helmsman SS Meteorite, Thresher 41mm Dusk. Vostok-Europe: VK64-515B568, VK64-515E628. Citizen: BN0150. Dan Henry: 1962 Racing Chronograph Black. That is 63 models in our base with a sourced 20 mm lug width.

Which 20 mm lug watch wears smallest?

The Seiko SRPD97, at 43.6 mm lug to lug (balanced from about 15.5 cm wrists by the flat-fit estimate). The longest here is the Seiko SLA079J1 at 49.3 mm, balanced from about 17.5 cm.

Sources

Documents checked · Report a wrong number

  1. 1Citizen Watch — Promaster Diver - Men's Eco-Drive BN0150-28E (product page) · html · read
  2. 2Tech Writer EDC (reviewer) — Citizen Promaster BN0150-28E Review · html · read
  3. 3Dan Henry Watches — 1962 Racing Chronograph | Black · html · read
  4. 4Jamtangan — Seiko Alpinist SARB017 Automatic 6R15 (JDM) product page · html · read
  5. 5WatchBase — Seiko SARB017, Mechanical Alpinist Stainless Steel / Green / Strap (WatchBase) · html · read
  6. 6StrapsCo — Seiko Prospex Alpinist SARB017 Lug Width & Strap Size · html · read
  7. 7Right Time International — SBDC091 pre-owned listing, Right Time (Denver), dealer spec block · html · read
  8. 8Seiko Watch Corporation — SLA077J1 | Seiko Watch Corporation · html · read
  9. 9Seiko Watch Corporation — SLA079J1 | Seiko Watch Corporation · html · read
  10. 10Right Time International — SPB121 listing, Right Time (Denver), dealer spec block · html · read
  11. 11Seiko Watch Corporation — SPB155 product page (us-en), seikowatches.com · html · read
  12. 12Seiko Watch Corporation — SPB157J1 product page (Prospex), seikowatches.com global-en · html · read
  13. 13Seiko Watch Corporation — SPB159J1 product page (Prospex), seikowatches.com global-en (US page 404) · html · read
  14. 14Seiko Watch Corporation — SPB165J1 product page (Presage), seikowatches.com global-en · html · read
  15. 15Seiko Watch Corporation — SPB169 product page (Presage), seikowatches.com global-en · html · read
  16. 16Seiko Watch Corporation — SPB209 product page (Prospex), seikowatches.com global-en · html · read
  17. 17Seiko Watch Corporation — SRPB41 product page (us-en), seikowatches.com · html · read
  18. 18Seiko Watch Corporation — SRPB43 product page (us-en), seikowatches.com · html · read
  19. 19Seiko Watch Corporation — SRPB46J1 product page (Presage), seikowatches.com US · html · read
  20. 20Right Time International — SRPB49 listing, Right Time (Denver), dealer spec block (pre-owned listing, sold out 2/2021) · html · read
  21. 21Right Time International — SRPB77 listing, Right Time (Denver) - authorised dealer, retailer spec block · html · read
  22. 22Seiko Watch Corporation — SRPD37J1 product page (Presage), seikowatches.com US · html · read
  23. 23Seiko Watch Corporation — SRPD97J1 product page (Presage), seikowatches.com global-en · html · read
  24. 24Seiko Watch Corporation — SRPE15J1 product page (Presage), seikowatches.com US · html · read
  25. 25Right Time International — SRPE17 listing, Right Time (Denver), dealer spec block · html · read
  26. 26Seiko Watch Corporation — SRPE19J1 product page (Presage), seikowatches.com global-en (US page 404) · html · read
  27. 27Seiko Watch Corporation — SRPE41J1 product page (Presage), seikowatches.com US · html · read
  28. 28Seiko Watch Corporation — SRPE43J1 product page (Presage), seikowatches.com US · html · read
  29. 29Seiko Watch Corporation — SRPE45 product page (us-en), seikowatches.com · html · read
  30. 30Seiko Watch Corporation — SRPE51 product page, seikowatches.com regional site (middleeast-en) · html · read
  31. 31Seiko Watch Corporation — SRPE53 product page, seikowatches.com regional site (se-en) · html · read
  32. 32Seiko Watch Corporation — SRPE55 product page, seikowatches.com regional site (fr-fr) · html · read
  33. 33Seiko Watch Corporation — SRPE57 product page (us-en), seikowatches.com · html · read
  34. 34Seiko Watch Corporation — SRPE61 product page (5 Sports), seikowatches.com global-en · html · read
  35. 35Seiko Watch Corporation — SRPE65 product page (5 Sports), seikowatches.com global-en · html · read
  36. 36Seiko Watch Corporation — SRPE67 product page (5 Sports), seikowatches.com global-en · html · read
  37. 37Seiko Watch Corporation — SRPE69 product page (5 Sports), seikowatches.com global-en · html · read
  38. 38Seiko Watch Corporation — SRPF41 product page (Presage), seikowatches.com my-en · html · read
  39. 39Right Time International — SRPF53 listing, Right Time (Denver), dealer spec block (listing, sold out) · html · read
  40. 40Seiko Watch Corporation — SRPG03J1 product page (Presage), seikowatches.com global-en · html · read
  41. 41Seiko Watch Corporation — SRPG07 product page (Presage), seikowatches.com middleeast-en · html · read
  42. 42Seiko Watch Corporation — SRPG09J1 product page (Presage), seikowatches.com middleeast-en · html · read
  43. 43Seiko Watch Corporation — SRPG27 product page (us-en), seikowatches.com · html · read
  44. 44Seiko Watch Corporation — SRPG29 product page (5 Sports), seikowatches.com us-en · html · read
  45. 45Seiko Watch Corporation — SRPG31 product page (5 Sports), seikowatches.com us-en · html · read
  46. 46Seiko Watch Corporation — SRPG33 product page (5 Sports), seikowatches.com middleeast-en · html · read
  47. 47Seiko Watch Corporation — SRPG35 product page (us-en), seikowatches.com · html · read
  48. 48Seiko Watch Corporation — SRPG37 product page (5 Sports), seikowatches.com us-en · html · read
  49. 49Seiko Watch Corporation — SRPG39 product page (5 Sports), seikowatches.com US · html · read
  50. 50Seiko Watch Corporation — SRPG41 product page (5 Sports), seikowatches.com us-en · html · read
  51. 51Seiko Watch Corporation — SRPH29 product page (5 Sports), seikowatches.com global-en · html · read
  52. 52Seiko Watch Corporation — SRPH31 product page (5 Sports), seikowatches.com global-en · html · read
  53. 53Seiko Watch Corporation — SRPH33 product page (5 Sports), seikowatches.com US · html · read
  54. 54Seiko Watch Corporation — SSA343J1 product page (Presage), seikowatches.com global-en · html · read
  55. 55Right Time International — SSA345 listing, Right Time (Denver), dealer spec block (pre-owned listing, sold out 6/2025) · html · read
  56. 56Seiko Watch Corporation — SSA347 product page (Presage), seikowatches.com global-en · html · read
  57. 57Seiko Watch Corporation — SSA405J1 product page (Presage), seikowatches.com global-en · html · read
  58. 58Seiko Watch Corporation — SSA425 product page (Presage), seikowatches.com us-en · html · read
  59. 59Seiko Watch Corporation — SSA457 product page (Presage), seikowatches.com global-en · html · read
  60. 60Seiko Watch Corporation — SSK059 product page (5 Sports), seikowatches.com us-en · html · read
  61. 61Seiko Watch Corporation — SUR373 product page (Discover More), seikowatches.com no-en · html · read
  62. 62Vostok-Europe — Undiné VK64-515B568 · html · read
  63. 63Vostok-Europe — Undiné VK64-515E628 · html · read
  64. 64Zelos Watches — Aurora Field 38mm Ti Aventurine product page · html · read
  65. 65Zelos Watches — Helmsman SS Meteorite product page · html · read
  66. 66Zelos Watches — Thresher 41mm Dusk product page · html · read