Roadmax 6K640AP Serpentine Belt

Roadmax 6K640AP Serpentine Belt Overview

The Roadmax 6K640AP is an automotive V-ribbed belt built for standard-duty accessory drive service. Made with EPDM and polyester cord reinforcement, it is sized for a 6-rib application with an effective length of 1627 mm (64.07 in.) and an outside circumference of 1641 mm (64.625 in.).

Roadmax positions this standard belt line for budget-conscious buyers who want dependable fit and function without stepping up to a premium-performance belt. The 6K640AP is a direct option for accessory drive belt replacement on select Ford F-150, Subaru Legacy, Subaru Outback, and other listed applications.

Key Features

• Part number: 6K640AP
• Automotive V-ribbed belt, standard-duty design
• EPDM construction for everyday accessory drive service
• Polyester cord material for belt stability
• 6-rib profile with K cross section designation
• Top width: 20 mm (.807 in.)
• Effective length: 1627 mm (64.07 in.)
• Outside circumference: 1641 mm (64.625 in.)

Product Details

The Roadmax Automotive V-Ribbed Belt (Standard) line focuses on practical replacement value for drivers who need a correct-size serpentine belt for routine maintenance. This belt is specified for accessory drive systems and is listed for applications including 2011-2025 Ford F-150, 2010-2014 Subaru Legacy, and 2010-2014 Subaru Outback. It also appears in fitment for select Volvo, Lincoln, Buick, and older Ford models, making 6K640AP a useful reference when searching by vehicle, belt size, or cross number.

This part cross-references Gates K060640 and Continental 6PK1623 for the same application.

Common Problems This Belt Can Address

• Squealing or chirping from a worn accessory drive belt
• Cracking, glazing, or rib wear on the existing serpentine belt
• Loss of proper drive to alternator, water pump, or other belt-driven accessories
• Belt stretch or incorrect length after service replacement
• Routine maintenance replacement on Ford F-150, Subaru Legacy, or Subaru Outback applications

Installation Notes and Tips

Verify belt routing against the vehicle’s accessory drive diagram before installation. Confirm the rib count, width, and effective length match the original belt specification, especially on 2011-2025 Ford F-150 applications and 2010-2014 Subaru Legacy or Subaru Outback models. Inspect pulleys, tensioners, and idlers for wear before installing the new belt so the replacement can track correctly and maintain proper tension.

• Fits 2011-2025 Ford F-150, Alternator and Water Pump
• Fits 2011-2014 Lincoln Mark LT, Alternator and Water Pump
• Fits 2010-2014 Subaru Legacy, N/A
• Fits 2010-2014 Subaru Outback, N/A
• Fits 1993-1994 Volvo 850, N/A, W/Original Belt Routing
• Fits 1992-1994 Volvo 960, N/A
• Fits 1991 Ford Aerostar, Fan, Alternator and Air Conditioning, Late
• Fits 1991 Ford Ranger, Fan, Alternator and Air Conditioning, Late
• Fits 1986-1987 Buick Regal, N/A
• Fits 1985-1987 Ford Ranger, Fan, Air Conditioning and Power Steering
• Fits 1985 Ford Bronco II, Fan, Air Conditioning and Power Steering

Quality Assurance

Roadmax standard V-ribbed belts are built with EPDM and polyester reinforcement for consistent fitment in accessory drive systems. The 6K640AP is specified to match the listed OE-style applications and cross-reference numbers for direct replacement selection.