Dayco 5100503 | Serpentine Belt

Part Number
Serpentine Belt

Fits: 03-11 Freightliner Century Class, 03-05 Freightliner Columbia, 03-04 Freightliner Coronado, 07-11 Freightliner Columbia, 08-09 Freightliner Coronado, 07 Western Star 4900EX, 07 Western Star 4900FA, 07 Western Star 4900SA, 08-11 Freightliner Cascadia, 08-09 Freightliner Classic, 08 Freightliner Classic XL, 13-14 Freightliner Cascadia

Special Price $39.01 Regular Price $45.89
In stock
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Estimated Ship Date: 1 Business Day or Less
The Dayco® Poly Rib® Belt is designed for power transmission on heavy duty multiple-accessory drives. This Poly Rib belt is the latest version of the revolutionary multi-ribbed belt first developed by Dayco® for the 1979 Ford® Mustang®. The Dayco® Poly Rib® Belt is manufactured from an extreme temperature EPDM rubber and features a construction that uses a highly fiber loaded compound to maximize belt life and load carrying requirements while minimizing pulley misalignment noise. This belt offers excellent resistance to high under hood temperatures and ozone contamination. In addition, specially formulated treated cord insures length and tension stability on heavy duty diesel engine drives for the life of the belt. The Dayco® Poly Rib® Belt meets or exceeds SAE J1459 and SAE J2432 specifications.

BRAND: Dayco




Cross SectionK-Section
Effective Length1276.35
Effective Length50.25
MaterialEPDM, Aramid Reinforced
Maximum Operating Temperature212
Maximum Operating Temperature100
Minimum Operating Temperature-42.7
Minimum Operating Temperature-45
Outside Circumference50.91
Outside Circumference1293.12
Rib DepthStandard
Rib ProfileStraight Rib
StandardsSAE J1459, SAE J2432
Top Width1.38

50 1/4 In. Belt



  • CARQUEST: K100502HD
  • ACDelco: K100502HD
  • NAPA: 25-100502
  • NAPA: 25-100502HD
  • CARQUEST: K100502
  • Gates: K100502
  • Navistar: 3520501-C1
  • Goodyear: 4100503
  • ACDelco: 10K502
  • Freightliner Trucks: 01-24894-004
  • Gates: K100502HD


  • 2008-2009 Freightliner Cascadia - Position: Fan
  • 2008-2009 Freightliner Coronado - Position: Fan
  • 2003-2004 Freightliner Coronado - Position: Fan
  • 2007-2007 Western Star 4900SA - Position: Fan
  • 2010-2010 Freightliner Century Class - Position: Fan
  • 2007-2007 Western Star 4900FA - Position: Fan
  • 2003-2005 Freightliner Columbia - Position: Fan
  • 2007-2007 Western Star 4900EX - Position: Fan
  • 2003-2007 Freightliner Century Class - Position: Fan
  • 2007-2011 Freightliner Columbia - Position: Fan
Customer Questions
Can a serpentine belt cause smoke?
Yes, a serpentine belt can cause smoke. A serpentine belt is an essential component of a vehicle's engine system. It drives various accessories such as the alternator, power steering pump, water pump, and air conditioning compressor. If the serpentine belt becomes worn, damaged, or misaligned, it can cause friction and generate smoke.
Why is my serpentine belt squealing?
The serpentine belt can squeal due to various reasons, including tension issues, worn-out belt, or a problem with the belt's pulleys.
Is my serpentine belt too tight?
If your serpentine belt is causing issues like excessive noise or accelerated wear on the pulleys, it may indicate that the belt is too tight.
Why did my serpentine belt come off?
Serpentine belts can come off due to factors such as belt wear, improper tension, misaligned pulleys, or a faulty tensioner.
Please, mind that only logged in users can submit questions

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