Caliso 645K6 Multi-Rib Poly V Serpentine Belt 6 Rib 64.5in

The Caliso 645K6 is a 6-rib Poly V serpentine belt (also sold under the FVP brand) engineered as a direct OEM-quality replacement for your vehicle's accessory drive belt system. With a 64.5-inch effective length and K-section profile, this belt is a drop-in replacement restoring factory-level performance to your engine's drive system.

Key Features:

• EPDM rubber construction — resists wear, cracking, and hardening better than traditional neoprene belts
• Synthetic fiber reinforcement — delivers up to 98% power transmission efficiency and maintains dimensional stability under load
• Straight ribbed multi-V (Poly V) design — ensures positive grip on all driven pulleys for smooth, quiet operation
• Oil, chemical, and abrasion resistant — holds up in harsh underhood environments
• Wide temperature range — rated stable from -30°F to 140°F for reliable performance in all climates
• No re-tensioning required — maintains proper tension throughout its service life
• OEM replacement fit — designed to meet or exceed original equipment specifications

Specifications:

• Belt Length: 64.5 inches
• Number of Ribs: 6
• Belt Section: K (Poly V / Multi-V)
• Metric Designation: 6PK1638

Cross-Reference Part Numbers: K060645, 4060645, 5060645, 6PK1638, 645K6

The 645K6 drives essential accessories such as the alternator, power steering pump, water pump, and air conditioning compressor. Replacing a worn or cracked serpentine belt at the first sign of wear helps prevent unexpected breakdowns and accessory failures.