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IWC Ingenieur

Most IWC Ingenieur references take a 20 mm watch strap: 101 of 202. The lug width follows the case size: 34 mm case → 20 mm, 40 mm case → 14 mm, 42 mm case → 20 mm and 46 mm case → 20 mm.

Shop 18 mmShop 19 mmShop 20 mmShop 21 mm

IWC Ingenieur lug width by case size

202 references measured; 17 more have an integrated bracelet. Updated 2026-10-29.

CaseLug widthReferencesWatch strap attachmentFor example
34 mm20 mm · 18 mm on 11 · 21 mm on 5 · 19 mm on 235—IW3505-02, IW3505-03, IW3505-04
35 mm14 mm · 18 mm on 14—IW3249-01, IW3249-03, IW3249-06
37 mm18 mm1—666AD
38 mm18 mm · 20 mm on 13—IW1832-01, IW9701 Roman
40 mm14 mm · 20 mm on 4 · 18 mm on 213—IW3287-02, IW3289-01, IW3289-02
42 mm20 mm · 18 mm on 29 · 21 mm on 7 · 19 mm on 2 · 14 mm on 1 · 22 mm on 189—IW3449-03, IW3807-01, IW3807-02
43 mm18 mm · 20 mm on 6 · 21 mm on 113—IW3227-07, IW3227-11, IW3244-04
44 mm20 mm · 18 mm on 1 · 22 mm on 17—IW3234-01, IW3234-04, IW3809-01
45 mm18 mm · 20 mm on 5 · 22 mm on 111—IW3785-09, IW3785-10, IW3785-11
46 mm20 mm · 21 mm on 5 · 18 mm on 3 · 22 mm on 3 · 19 mm on 126—IW3224-01, IW3224-02, IW3224-04

References that take a different watch strap

  • IW3505-01: 18 mm, not the 20 mm of most 34 mm cases
  • IW3505-06: 21 mm, not the 20 mm of most 34 mm cases
  • IW3505-11: 21 mm, not the 20 mm of most 34 mm cases
  • IW3505-12: 19 mm, not the 20 mm of most 34 mm cases
  • IW3505-13: 18 mm, not the 20 mm of most 34 mm cases
  • IW3521-01: 18 mm, not the 20 mm of most 34 mm cases
  • IW3805-02: 18 mm, not the 20 mm of most 34 mm cases
  • IW3805-04: 21 mm, not the 20 mm of most 34 mm cases
  • IW3805-05: 18 mm, not the 20 mm of most 34 mm cases
  • IW3815-02: 21 mm, not the 20 mm of most 34 mm cases
  • IW3815-03: 18 mm, not the 20 mm of most 34 mm cases
  • IW3815-04: 18 mm, not the 20 mm of most 34 mm cases
  • IW3815-07: 18 mm, not the 20 mm of most 34 mm cases
  • IW3815-08: 19 mm, not the 20 mm of most 34 mm cases
  • IW4515-02: 21 mm, not the 20 mm of most 34 mm cases
  • IW4515-04: 18 mm, not the 20 mm of most 34 mm cases
  • IW4515-05: 18 mm, not the 20 mm of most 34 mm cases
  • IW9515-04: 18 mm, not the 20 mm of most 34 mm cases
  • IW3540-03: 18 mm, not the 14 mm of most 35 mm cases
  • IW9701: 20 mm, not the 18 mm of most 38 mm cases
  • IW322801: 20 mm, not the 14 mm of most 40 mm cases
  • IW3239-04: 18 mm, not the 14 mm of most 40 mm cases
  • IW3239-06: 20 mm, not the 14 mm of most 40 mm cases
  • IW3239-09: 20 mm, not the 14 mm of most 40 mm cases

And 69 more in the full list below.

Questions about the IWC Ingenieur

Do all IWC Ingenieur case sizes take the same watch strap?

No. The lug width changes with the case size: the 34 mm case takes 20 mm, the 40 mm case takes 14 mm, the 42 mm case takes 20 mm, the 43 mm case takes 18 mm and the 46 mm case takes 20 mm. Check your case diameter before you buy.

Can two IWC Ingenieur watches with a 42 mm case take different watch straps?

Yes. Of the 89 IWC Ingenieur references with a 42 mm case, 49 take 20 mm, 29 take 18 mm and 7 take 21 mm. The reference number decides, not the case size alone.

Every IWC Ingenieur reference

Other IWC families

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

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