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Gates K120842HD Serpentine Belt
Heavy-Duty Serpentine Belt for Fleet Drives
The Gates FleetRunner Heavy Duty Micro-V Belt is a heavy-duty serpentine belt built for accessory drive systems that see demanding service. Part number K120842HD uses patented EPDM construction with a distinct green overcord to improve flexibility, stability, and service life in fleet and commercial applications.
For buyers searching for a durable serpentine belt for heavy-duty truck and fleet maintenance, K120842HD delivers OE-improved construction in a 12-rib K-section profile. It is engineered for accessory drive systems that need consistent belt tracking and long-term performance.
Key Features
- Gates FleetRunner Heavy Duty Micro-V Belt
- Part number K120842HD
- 12-rib K-section serpentine belt
- EPDM belt material for heavy-duty accessory drives
- Polyester cord reinforcement
- OE Improved comparison rating
- Effective length: 84.23 in. (2139 mm)
- Outside circumference: 84.799 in. (2154 mm)
- Top width: 1.647 in. (42 mm)
Product Details
The FleetRunner Heavy-Duty Micro-V belt line is built for fleet operators who need reduced downtime and dependable accessory drive performance. Gates uses EPDM construction and a green overcord design to improve durability, flexibility, and stability under heavy-duty operating conditions. This makes K120842HD a practical choice for commercial vehicles, diesel applications, and other demanding belt-driven systems where consistent operation matters.
This part cross-references Continental 4120842 and Dayco 5120843 for the same application. Search terms such as heavy-duty serpentine belt, 12-rib accessory drive belt, and Gates K120842HD serpentine belt are commonly used by buyers looking for this type of replacement.
What It Helps Address
- Squealing or slipping accessory drive belts
- Cracking, glazing, or wear on an aging serpentine belt
- Loss of belt stability in heavy-duty service
- Reduced accessory drive consistency on fleet vehicles
- Replacement needs for commercial truck belt maintenance
Installation Notes and Tips
Verify the belt length, rib count, and section designation before installation. Confirm the routing path against the vehicle’s belt diagram and inspect pulleys, tensioners, and idlers for wear before fitting the new belt. For fitment-based searches, this part is commonly referenced for heavy-duty truck and fleet applications, including Ford F-Series, Chevrolet Silverado, and GMC Sierra service vehicles where the correct K-section 12-rib belt is required.
Quality Assurance
Gates FleetRunner belts are engineered with EPDM construction and OE-improved design standards for demanding accessory drive systems. The K120842HD part number identifies the exact belt specification for accurate replacement selection.
| Brand | Gates |
|---|---|
| Part Number | K120842HD |
| Top Width | 1.647 |
| Top Width | 42 |
| Cord Material | Polyester |
| Cross Section Designation | K |
| Effective Length | 2139 |
| Effective Length | 84.23 |
| Outside Circumference | 2154 |
| Outside Circumference | 84.799 |
| 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.