Caliso 425K4 K-Section Poly-V Serpentine Belt - 42.5 4-Rib

The Caliso 425K4 is a K-section Poly-V (Poly Rib) serpentine belt designed for reliable accessory drive performance. With a 42.5-inch pitch length (43.25-inch outside length) and 4 ribs, this belt delivers efficient power transfer to engine-driven accessories such as power steering pumps, air conditioning compressors, and alternators.

The K-section Poly-V design features longitudinal V-shaped ribs that mate with precision-grooved pulleys, combining the flexibility of a flat belt with the superior grip of multiple V-belts. The construction incorporates high-strength synthetic tensile cords for minimal stretch and long service life, along with a specially formulated rubber compound body that resists heat, oil, and wear.

Key Specifications:

• Belt Type: K-Section Poly-V (Serpentine / Micro Rib)
• Pitch Length: 42.5 inches (1080mm)
• Outside Length: 43.25 inches
• Number of Ribs: 4
• Metric Code: 4PK1080
• Rib Pitch: 3.56mm (K-section standard)

Cross-Reference Part Numbers:

• Gates: K040425
• Dayco: 5040425
• NAPA: 25-040425 / 25040425
• Goodyear: 4040425
• Bando: 4PK1079 / 4PK1080
• ACDelco: 4K425 / K040425HD
• ContiTech: PK040425
• Cummins: 3040665
• Driveworks: 425K4
• CARQUEST: K040425 / K040425HD

This belt is a direct replacement for OEM and aftermarket serpentine belts sharing the 425K4 / 4PK1080 specification, making it a versatile and widely compatible choice for routine belt maintenance and replacement.