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Specifications

The PAI Industries 640015 Cylinder Head Bolt is precision-machined steel, 12-point design, measuring M16 × 2 × 175 mm, intended for Detroit Diesel Series 50 and Series 60 engines. It replaces OEM part 23530768 (and alternate 8929123), delivering OEM-compliant strength and fit across 38 bolts per head configuration.



Constructed in ISO-certified U.S. manufacturing facilities, this bolt embodies durability, strict quality control, and detailed 3D-engineered tolerances—earning a 2-year unlimited mileage warranty. Offered by Wofford Truck Parts, it's ideal for engine rebuilds, ensuring exact fitment, reliable torque retention, and long-term performance.


Weight
2.48

Compatibility

Freightliner – FLD, Century, Columbia, Coronado, Argosy

Kenworth – T600, T800, W900

Peterbilt – 377, 378, 379, 386, 388

Western Star – 4700, 4900

Sterling – Acterra, A-Line

International / Navistar – select transit & line-haul models

Bus / Coach / RV / Specialty – various rigs using Series 50/60 engines


Alternative Part Numbers

  • DDC23530768
  • DDP640015
  • Detroit Diesel 23530768
  • Detroit Diesel 8929123
  • PAI640015
  • PAI640015-019

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