Caliso 450K4 Poly-V Serpentine Belt K-Section Pitch Length - 4-Rib 45

The Caliso 450K4 is a K-section Poly-V serpentine belt (also known as a multi-rib or micro-rib belt) designed as a direct OEM-replacement drive belt for automotive and light-duty accessory drive systems. With a 45.0-inch pitch length and 4 ribs, this belt is engineered to restore proper function to the serpentine belt drive system.

Key Specifications:

• Belt Type: K-Section Poly-V (Multi-Rib / Serpentine)
• Number of Ribs: 4
• Pitch Length: 45.0 inches
• Outside Circumference: Approximately 45.75 inches
• Top Width: 0.56 inches per rib (2.24 inches total)
• Section: K (standard micro-rib profile)
• Cross Reference: 450K4, K040450, 4040450, 4PK1143

Construction & Features:

• Constructed with EPDM rubber for excellent heat, ozone, and abrasion resistance
• Reinforced with synthetic fiber in the rib stock to reduce noise and resist wear from misaligned pulleys
• Treated polyester tensile cord minimizes belt stretch for consistent tension over the belt's service life
• Designed for use with small-diameter pulleys, backside idlers, and automatic tensioners
• Meets or exceeds OEM specifications for fit, form, and function

The 450K4 serpentine belt powers critical engine accessories including the alternator, power steering pump, water pump, and air conditioning compressor. Regular inspection and timely replacement help prevent unexpected belt failure and protect accessory components.