DAY5120852

Includes (sold as a single belt):

• 1× heavy‑duty 12‑rib serpentine fan belt for Cummins ISX15/X15 front‑end accessory/fan drive systems.​
• Designed to route around crank, fan hub, idlers, and tensioner in high‑wrap, high‑load ISX/X15 fan drive layouts.​​
• Gold Label EPDM construction provides long life under continuous high tension and temperature typical of Class 8 cooling systems.

Dayco 5120852 is a 12‑rib, 85.24‑inch Poly Rib Gold Label serpentine belt engineered as a primary fan belt for Cummins ISX15/X15 engines in modern highway tractors. Its 12PK2165 profile and 1.66‑inch width deliver high power capacity

Fits Typical ISX15 / X15 Fan Applications

• Kenworth T680 (e.g., 2020 model year) with Cummins ISX15/X15 fan drive.​
• International LT / ProStar and other Class 8 tractors equipped with ISX15/X15 using 12‑rib 85.24" fan belts.​
• Other heavy‑duty trucks that specify metric fan belt size 12PK2165 for ISX/X15 engines.