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Gates K120671HD Serpentine Belt - Fan or Fan and Water Pump
Heavy-Duty Belt for Fleet Accessory Drives
The Gates FleetRunner Heavy Duty Micro-V Belt K120671HD is a heavy-duty serpentine belt built for accessory drive systems that see constant load and long operating hours. Its EPDM construction and polyester cord support durability, flexibility, and stable performance in demanding fleet service.
For fleet maintenance on vehicles such as Ford F-150 and Chevrolet Silverado applications that use this belt size, K120671HD provides an OE-improved replacement option with the dimensions needed for proper drive alignment.
Key Features
- FleetRunner Heavy Duty Micro-V belt from Gates
- Part number: K120671HD
- Automotive V-ribbed belt, heavy-duty type
- 12-rib design for accessory drive applications
- EPDM belt material for durability and longer service life
- Polyester cord material for strength and stability
- Distinct green overcord for FleetRunner identification
- OE Improved comparison rating
- Effective length: 67.13 in. (1705 mm)
- Outside circumference: 67.63 in. (1718 mm)
Product Details
Gates FleetRunner Heavy Duty Micro-V belts are engineered for fleet use where downtime and replacement frequency matter. The EPDM construction resists wear in high-heat accessory drive environments, while the polyester cord helps maintain belt stability under load. With a K-section profile and 12 ribs, this belt is sized for heavy-duty serpentine drive systems that require consistent grip and reliable transfer of power to driven accessories. K120671HD is a direct-fit style replacement for applications that call for this belt dimension and construction.
This part cross-references 12K671 and 25-120671 for the same application.
Common Issues This Belt Can Address
- Squealing or slipping from a worn accessory drive belt
- Cracking, glazing, or fraying on an aging serpentine belt
- Loss of belt tension stability in heavy-duty service
- Reduced accessory drive performance from belt wear
- Frequent belt replacement on fleet vehicles
Installation Notes and Tips
Verify the belt length, rib count, and section profile before installation. Inspect pulleys, tensioners, and idlers for wear or misalignment, since those conditions can shorten belt life. Confirm the routing matches the vehicle’s accessory drive layout before starting the engine. Fits 2006-2011 Ford F-150, front accessory drive; fits 2007-2013 Chevrolet Silverado, front accessory drive.
Quality Assurance
Gates is known for OE-focused belt engineering, and the FleetRunner line is built for heavy-duty fleet service with EPDM construction and an OE Improved rating.
| Brand | Gates |
|---|---|
| Part Number | K120671HD |
| Top Width | 1.647 |
| Top Width | 42 |
| Cord Material | Polyester |
| Cross Section Designation | K |
| Effective Length | 1705 |
| Effective Length | 67.13 |
| Outside Circumference | 1718 |
| Outside Circumference | 67.63 |
| Type | Automotive v-ribbed belt (heavy duty) |
| Rib Quantity | 12 |
| Washer Pump Included | Epdm |
| Belt Material | Epdm |
| Cord Material | Polyester |
| OE Comparison Rating | Oe improved |
| Section | K |
| Type | Automotive v-ribbed belt (heavy duty) |
This part fits 0 vehicles. Search below:
| Year | Make | Model | Position | Notes |
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* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.