Caliso 645K5 Poly-V Serpentine Belt K-Section - 64.5in 5-Rib

The Caliso 645K5 is a Poly-V (K-section) serpentine belt measuring 64.5 inches in outside circumference with 5 ribs. Engineered as a direct OEM-replacement drive belt, it restores proper function to the accessory drive system, powering components such as the alternator, power steering pump, air conditioning compressor, and water pump.

Constructed from EPDM (Ethylene Propylene Diene Monomer) rubber, this belt delivers excellent resistance to heat, ozone, abrasion, and oil — outperforming older neoprene-based belts in long-term durability. Polyester fiber tensile cords are embedded throughout to minimize belt stretch and maintain consistent tension over the life of the belt.

Key Features:

• Belt Type: Poly-V / K-Section (Micro-V Ribbed Serpentine Belt)
• Outside Circumference: 64.5 inches
• Number of Ribs: 5
• Material: EPDM rubber compound with polyester fiber tensile members
• Temperature Range: Stable from -30°F to 140°F
• Resistance: Heat, ozone, abrasion, and chemical/oil resistant
• Meets or exceeds OEM specifications
• Straight ribbed belt design for smooth, quiet operation

The 645K5 is a widely used K-section serpentine belt cross-referenced across multiple brands. Its robust EPDM construction and precise rib geometry ensure reliable power transfer and reduced noise, even on worn or slightly misaligned pulley systems.