Rubber Strap, Black – compatible with Longines HydroConquest

$50.00 In stock

US shipping $5.99, free on orders of $40+ · dispatched in 1–3 business days · delivered in about 7 business days after dispatch
30-day returns on unworn straps in original packaging
Made for the models listed under Details · straps only, watch not included

Swap it yourself Spring Bar Tool – fork and pin tips, for strap changes $13.00

Details

Enhance your Longines HydroConquest with our premium black rubber strap — built for durability and modern style. Designed for a seamless fit, this st rap combines comfort, functionality, and rugged sophistication, making it ideal for both daily wear and aquatic adventures. Crafted from high-grade rubber, it offers flexibility and resilience without compromising on comfort. The deep black color brings a bold, timeless look to your Longines, perfectly complementing its sporty design.

Fits

Model: Longines HydroConquest
Lug width: 19 / 20 / 21 mm
End: curved, shaped to the case of the listed models

Specifications

Material: Premium Rubber
Size: 92mm + 92mm
Color: Black
Buckle options: Silver, No Buckle

In the box

The Strap with the chosen Buckle

Brand and model names are used only to describe compatibility. Lugline is an independent brand and is not affiliated with, endorsed by or sponsored by any watch manufacturer. Watch not included.

Fit & size check

Curved end. The end of this strap is shaped to follow the case of the models listed under Details, so it is listed for those models only, not for every watch with the same lug width.
Lug width: 19 / 20 / 21 mm. To check yours, measure the inside distance between the two lugs, level with the spring bar, to the nearest millimetre. How to measure
Check your model before ordering. Make sure your watch is among the models listed under Details. Not listed? Try the Strap Finder or request a model.

Full size guide →

Shipping

Ships within 1–3 business days. United States: tracked standard shipping $5.99, free on orders of $40 or more, estimated delivery about 7 business days after dispatch (5–9 business days). Import duties, if any, are collected by the carrier before delivery.

Returns

30-day returns on unworn straps in original packaging. Return shipping is paid by the customer unless the item arrived damaged or incorrect. Refunds go back to the original payment method within 5 business days of receipt. Refund policy

SIZE GUIDE

1. How to measure lug width

Lug width is the inside distance between the two lugs of the watch case, where the strap is attached. It is always given in millimetres.

Remove the current strap, or measure with it fitted if the ends are visible.
Place a ruler or calipers between the inner faces of the lugs, level with the spring bar.
Read the value to the nearest millimetre. Most watches measure 18, 19, 20, 21, 22 or 24 mm.

Not sure? Look up your reference number with the Strap Finder. A strap that is 1 mm too narrow leaves a visible gap; a strap that is too wide will not fit.

18 mm 19 mm 20 mm 21 mm 22 mm 23 mm 24 mm

2. Wrist size: short or long strap

Wrap a soft tape (or a strip of paper) around your wrist where you wear your watch and note the circumference. Then choose the strap length:

Wrist circumference	Strap length	Typical split (long / short side)
14 – 16.5 cm (5.5 – 6.5 in)	Short / Small	approx. 105 / 70 mm
16.5 – 19.5 cm (6.5 – 7.7 in)	Regular / Medium	approx. 115 / 75 mm
19.5 – 22 cm (7.7 – 8.7 in)	Long / Large	approx. 120 / 75 mm

Lengths vary by strap; the exact sizes are shown on each product page. Cut-to-size straps are trimmed to your wrist at home.

3. Integrated straps: counting bracelet links

Integrated straps re-use the folding clasp from your current bracelet. The size is set by how many removable links your bracelet has on each side of the clasp.

Hold the bracelet with the clasp at the bottom.
Count the removable links (those held by a screw or pin) between the clasp and the case, on the 6 o'clock side and the 12 o'clock side.
Write it as “6 o'clock by 12 o'clock”, for example 4 by 6, and pick the size with the same numbers.

Links on your bracelet	Choose
4 by 4	X-Small / Small
4 by 5 or 4 by 6	Small / Medium
5 by 5 or 5 by 6	Medium / Large
6 by 6	Large / X-Large

Jubilee bracelets use different link counts; the matching sizes are listed on each Jubilee product page.

4. Smartwatches

Apple Watch: 38 / 40 / 41 mm and 42 mm (Series 10 and later) share one band size; 42 mm (Series 1–3) / 44 / 45 / 46 / 49 mm share the other.
Samsung Galaxy Watch4 – Watch7: 20 mm quick-release bands.
Garmin QuickFit: 20, 22 or 26 mm, not interchangeable with standard quick-release bands.

Open the full size guide

Made for the Longines HydroConquest

The ends are moulded to the curve of the Longines HydroConquest case, so the strap sits flush against the lugs with no gap and no rocking. Lug width 19 mm / 20 mm / 21 mm. The exact models it fits are listed under Details.

Rubber made for every day

Soft, matte rubber that flexes with the wrist from the first day, with no break-in. It does not soak up sweat or sunscreen, so after a swim or a run you rinse it under the tap and it is dry in minutes.

Watch Tool – for Rolex Strap installation

Swapped in minutes, dispatched in 1–3 business days

The strap fits on standard spring bars, so the swap takes a couple of minutes with a spring-bar tool. If you do not own one, the Lugline spring-bar tool is $13.00, or any watchmaker will do it while you wait.

US shipping is $5.99 and free from $40. Orders are dispatched in 1–3 business days and typically arrive about 7 business days after dispatch. Unworn straps can be returned within 30 days.