Longines · HydroConquest

Strap for HydroConquest 44 Quartz Stainless Steel / Blue / Bracelet

Takes 22 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width22 mm
Case diameter44 mm
ReferenceL3.840.4.96.6 (aka: L38404966)
FamilyHydroConquest
MovementLongines caliber L157 Hours, Seconds, Minutes | Date
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

Straps for the HydroConquest L3.840.4.96.6 (aka: L38404966)

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

Frequently asked questions

What is the lug width of the Longines HydroConquest L3.840.4.96.6?

The HydroConquest L3.840.4.96.6 requires straps with a 22 mm lug width. This dimension is measured as the net distance between the two spring bars (pins) that attach the strap to the case. It is important not to confuse this measurement with the internal diameter of the buckle or the visual width of the strap on the wrist.

Which strap material is most suitable for the Longines HydroConquest L3.840.4.96.6?

For a 44 mm diver, the most compatible materials are: structured alligator for formal elegance, medium-weight calf leather (1.4–1.6 mm) for daily comfort, NATO nylon for sports practicality, and FKM rubber for wet environments and aquatic activities. Choice depends on intended use: alligator favours smart-casual contexts, calf balances robustness and versatility, NATO offers replacement convenience, whilst rubber ensures grip even with a wetsuit.

How do you change the strap on a Longines HydroConquest?

The strap is secured by spring bars (or spring pins) that slide into small holes in the case. Using a dedicated tool (spring bar tool) or a very thin screwdriver, apply light pressure on the lateral pins to make them click, releasing the strap end. The new strap is inserted by aligning the hole with the pin, which snaps automatically into position. For 22 mm lugs, ensure that the spring bars are indeed removable and not soldered.

Are aftermarket straps compatible with the 22 mm lug width available?

Yes, milanostraps.it offers a complete collection of 22 mm straps personalizable in leather, colour, initials, and stitching thread. All straps are handcrafted and available both as standard online versions and bespoke at Casati Milano atelier. Compatibility is guaranteed as our straps are specifically designed for this lug width.

How long does a leather strap last on a Longines diver like the HydroConquest?

Durability depends on material and usage. A high-quality alligator or vegetable-tanned calf strap typically resists 3–5 years under normal conditions (daily wear without prolonged water contact). If frequently exposed to moisture, saltwater, or chlorine, lifespan reduces to 18–24 months. FKM rubber offers greater longevity (5–7 years) in wet environments. Regular maintenance (cleaning, drying) and avoiding repeated prolonged immersions significantly extend strap life.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

Request an appointment →

Casati Milano · Via XX Settembre 15, Milan · by appointment only