Roadmax 6K423AP Serpentine Belt - Alternator, Alternator and Air Conditioning or Water Pump

Roadmax 6K423AP Serpentine Belt Overview

The Roadmax 6K423AP is an Automotive V-Ribbed Belt (Standard) built with EPDM and polyester cord for dependable accessory drive performance. It is a practical replacement choice for drivers who want solid quality in a standard belt construction without stepping up to a premium-duty option.

Compatible With BMW X5, BMW 430i, BMW 540i xDrive, BMW M340i, BMW X3, BMW X6, BMW X7, BMW 740i, and Nissan Altima applications, this belt is sized for common accessory drive layouts and is cross-referenced to OE-style part numbers such as Gates K060423 and Bando 6PK1075. The Roadmax 6K423AP also matches the 6-rib, K-section format used across many late-model BMW and select Nissan accessory drive systems.

Key Features

• EPDM construction for modern serpentine belt service
• Polyester cord material for stable belt reinforcement
• 6-rib design for accessory drive applications
• Top width: 20 mm (.807 in.)
• Effective length: 1074 mm (42.3 in.)
• Outside circumference: 1089 mm (42.875 in.)
• Standard Automotive V-Ribbed Belt construction

Product Details

Roadmax positions the 6K423AP within its Automotive V-Ribbed Belt (Standard) line for budget-conscious buyers who still want a properly specified replacement belt. The EPDM belt material is commonly used in contemporary accessory drive systems, while the polyester cord helps maintain belt structure under normal operating conditions. With a 6-rib K cross section and a 42.3-inch effective length, this belt is built to match the dimensions required by the listed BMW and Nissan applications.

This part cross-references Gates K060423 and Bando 6PK1075 for the same application. Search terms such as BMW X5 serpentine belt replacement, BMW 430i accessory drive belt, and 2002-2006 Nissan Altima alternator and air conditioning belt all align with this part number, 6K423AP.

What This Belt Helps Address

• Squealing or slipping accessory drive belt noise
• Cracked, glazed, or worn serpentine belt surfaces
• Loss of proper drive to alternator, A/C, or other belt-driven accessories
• Maintenance replacement for high-mileage accessory drive systems
• Fitment-specific replacement needs on BMW and Nissan applications

Installation Notes and Tips

Verify belt routing, rib count, and measured length against the vehicle’s accessory drive diagram before installation. Confirm the pulley condition and inspect tensioner and idler components at the same time, since worn pulleys can shorten belt life. For fitment-specific searches, this part is listed for 2024-2026 BMW X5, 2025 BMW 430i, 2025 BMW 430i Gran Coupe, 2025 BMW 430i xDrive, 2025 BMW 430i xDrive Gran Coupe, 2024-2025 BMW 540i xDrive, 2025 BMW M340i, 2025 BMW M340i xDrive, 2025 BMW X3, 2024-2025 BMW X6, 2023-2025 BMW X7, 2022-2023 BMW 740i, 2022 BMW 740i xDrive, and 2002-2006 Nissan Altima with Alternator and Air Conditioning position.

Quality Assurance

Roadmax supplies this belt as a standard replacement component for listed OE-style applications. The EPDM construction, polyester reinforcement, and application-specific sizing support consistent accessory drive service for the vehicles shown in the fitment data.