Hublot · Classic Fusion

Strap for Classic Fusion 45 Chronograph Ceramic / Blue

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

20mm

20 mm straps All Hublot

Lug width20 mm

Case diameter45 mm

Reference521.CM.7170.LR

FamilyClassic Fusion

MovementHublot caliber HUB1143 Hours, Minutes, Small Seconds | Date | Chronograph

CaseTitanium, Ceramic, Resin

Spring bar

Swiss Standard universal spring bars

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

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Straps for the Classic Fusion 521.CM.7170.LR

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Classic Fusion 521.CM.7170.LR, seen from the bench

The Hublot Classic Fusion 45 Chronograph Ceramic (reference 521.CM.7170.LR) combines brushed titanium grade 5, black ceramic inserts, and resin in a 45mm case with integrated lugs measuring 20mm width. Powered by the HUB1143 in-house movement featuring chronograph, small seconds at 9 o'clock, and date, this timepiece delivers both technical precision and layered material construction. The integrated lugs are machined directly into the case body, requiring 20mm straps with 1.5mm spring bars in stainless steel or titanium for proper fit.

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.

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