Contitech 1258K8MK Serpentine Belt - Accessory Drive

Contitech 1258K8MK Serpentine Belt for Ford Super Duty

The Contitech 1258K8MK is a serpentine belt for the accessory drive system on select Ford Super Duty trucks. It is listed for 2003-2007 Ford F-250 Super Duty and 2003-2007 Ford F-350 Super Duty applications with a single alternator and a 125.8-inch effective length belt.

Key Features

• Serpentine belt for accessory drive use
• Multi-V belt construction
• 125.8-inch effective length
• Fits single alternator configurations
• Compatible with 2003-2007 Ford F-250 Super Duty and Ford F-350 Super Duty
• Contitech part number 1258K8MK

Detailed Description

Use the Contitech 1258K8MK when replacing the accessory drive belt on a Ford F-250 Super Duty or Ford F-350 Super Duty equipped with a single alternator setup. This serpentine belt routes engine power to driven accessories through a multi-rib design and is specified with a 125.8-inch effective length for the listed truck applications. If you are searching for a 2003-2007 Ford F-250 Super Duty serpentine belt or a 2003-2007 Ford F-350 Super Duty accessory drive belt, this part number provides a direct fit reference for those configurations.

What It Helps Address

• Squealing or chirping from a worn accessory drive belt
• Cracking, glazing, or visible belt wear
• Belt slippage on the accessory drive system
• Loss of proper drive to belt-driven accessories
• Replacement needs for a 125.8-inch effective length belt

Installation Notes and Tips

Confirm the vehicle uses a single alternator accessory drive layout before ordering. Match the belt length and routing to the existing setup, and inspect pulleys, tensioner operation, and accessory alignment during replacement. Verify fitment against the vehicle’s engine bay routing for 2003-2007 Ford F-250 Super Duty and Ford F-350 Super Duty models.

Quality Assurance

Contitech is a recognized name in belt and cooling components, and this part is cataloged for the specified Ford Super Duty applications. Part number 1258K8MK should be matched to the vehicle’s accessory drive configuration for accurate replacement.