Gates Micro-V Stretch-Fit Serpentine Drive Belt K040337SF — Pre-Stretched, Easy-Install OEM Fit

The Gates K040337SF Stretch Fit Micro-V serpentine drive belt is a factory-style, pre-stretched replacement belt engineered to restore proper accessory drive tension and routing without a tensioner adjustment.

This belt from Gates is designed for use where a stretch-fit Micro-V belt is specified. Built with Gates materials science and manufacturing standards, the K040337SF offers the dimensional accuracy and compound needed to fit modern accessory-drive systems that require a pre-stretched belt. The product ships from the United States in compact packaging suitable for retail or service shelves.

What makes the K040337SF different from a standard V-belt?

The Micro-V stretch-fit design uses an elastic backing that allows the installer to pull the belt over pulleys and then have it take up the correct tension in-service, removing the need to adjust a separate tensioner during installation. That construction also provides consistent pulley contact and helps maintain correct routing for multiple accessory drives.

• Pre-stretched Micro-V construction for easy installation
• Engineered compound for dimensional stability
• Fits applications calling specifically for K040337SF sizing

How do I know this belt will fit my vehicle or machine?

Fitment depends on the exact accessory-drive layout and belt length/profile required by the original equipment. Always cross-reference the part number K040337SF with your vehicle or equipment's manufacturer parts list or an application guide to confirm compatibility.

• Check OEM part number or belt routing diagram
• Compare belt profile and rib count to the original
• Confirm stretch-fit type is specified for the application

How should I handle and install a stretch-fit Micro-V belt?

Handle the belt carefully to avoid twisting or excessive bending; stretch-fit belts are designed to be drawn over the largest pulley and then seat into smaller pulleys. Follow the vehicle or equipment manufacturer's installation procedure, and inspect pulleys and tensioners for wear before installing a new belt.

• Route belt following the OEM diagram; do not twist the belt
• Pull over the largest pulley and allow elastic recovery to set tension
• Inspect pulleys, tensioner, and accessory alignment before final run-in

What are the physical and shipping details for this item?

The Gates K040337SF ships in compact packaging suitable for inventory and point-of-sale display; the listed package dimensions and weight make it easy to store and ship. It is manufactured in the United States under Gates quality controls.

• Item package dimensions: 15.2" L × 6.0" W × 0.6" H
• Package weight: approximately 0.11 lbs
• Country of origin: United States

Who is this for? The Gates K040337SF Stretch Fit Micro-V belt is aimed at professional technicians, independent mechanics, fleet maintenance staff, and do-it-yourself vehicle owners who need an exact-fit, pre-stretched replacement for applications that specify a Micro-V stretch-fit belt. If your vehicle or equipment calls for the K040337SF part number or a stretch-fit Micro-V belt of matching dimensions, this Gates unit is engineered to meet those installation and dimensional requirements while simplifying swap-out without a tensioner adjustment.