Product Description
Cummins 3900625 OEM Hex Flange Head Cap Screw – Intake Air Heater Harness Bolt – Ram 5.9L/6.7L (2003–2013)
The Cummins 3900625 OEM Hex Flange Head Cap Screw is the factory-correct fastener used to secure intake air heater and grid heater electrical harness connections on 2003–2013 Ram trucks equipped with the 5.9L and 6.7L Cummins diesel engines. Designed to provide proper clamp load, secure electrical contact, and long-term reliability, this genuine Cummins hardware helps maintain consistent grid heater operation and dependable cold-weather starting performance.
Unlike generic hardware-store fasteners, the genuine Cummins 3900625 bolt is manufactured to OEM specifications for fit, strength, and flange-seat design. Whether you are replacing damaged hardware, repairing melted grid heater wiring, installing a new intake heater element, or restoring factory reliability, this OEM fastener ensures proper electrical connection and dependable service life.
Features
- Genuine Cummins OEM hardware
- Factory-correct hex flange head cap screw
- M6 x 1.0 x 10mm thread size
- Designed for intake air heater and grid heater electrical connections
- Provides proper clamp load and electrical contact
- Helps prevent loose or overheated grid heater connections
- Corrosion-resistant OEM construction
- Direct replacement for worn, damaged, or missing hardware
- Maintains factory reliability and fitment
- Ideal for intake heater service and harness repairs
Fitment
- 2003–2007 Dodge Ram 2500 5.9L Cummins
- 2003–2007 Dodge Ram 3500 5.9L Cummins
- 2007.5–2013 Ram 2500 6.7L Cummins
- 2007.5–2013 Ram 3500 6.7L Cummins
- Ram 3500, 4500, and 5500 chassis-cab models where equipped
- Applications utilizing OEM Cummins intake air heater/grid heater assemblies
Note: Always verify fitment by VIN or Engine Serial Number (ESN) before ordering, as hardware usage may vary by application.
What's Included
- One (1) Genuine Cummins 3900625 Hex Flange Head Cap Screw
Specifications
- Manufacturer: Cummins
- Part Number: 3900625
- Hardware Type: Hex Flange Head Cap Screw
- Thread Size: M6 x 1.0 x 10mm
- Function: Intake Air Heater/Grid Heater Harness Fastener
- Material: OEM Cummins Hardened Steel Construction
- Application: Grid Heater Electrical Connections
- Engine Compatibility: 5.9L Cummins and 6.7L Cummins
- Vehicle Compatibility: 2003–2013 Ram Diesel Trucks
- Installation Location: Intake Air Heater/Grid Heater Assembly
- OEM Replacement: Yes
Cross Reference Numbers
3900625, Cummins 3900625, M6x1x10 Cummins Bolt, Grid Heater Bolt, Intake Air Heater Bolt, Intake Heater Harness Bolt, OEM Cummins Fastener, Cummins Intake Heater Hardware
FAQ
What does the Cummins 3900625 bolt secure?
This bolt secures the intake air heater or grid heater electrical harness connections and helps ensure proper electrical contact for reliable heater operation.
Is this a genuine Cummins OEM fastener?
Yes. The 3900625 is a genuine Cummins OEM hex flange head cap screw designed specifically for Cummins engine applications.
Can I use a hardware-store bolt instead?
Using the correct OEM fastener is recommended because it provides the proper fit, flange design, strength, and clamp load required for critical electrical connections.
Does this fit both 5.9L and 6.7L Cummins engines?
Yes. This bolt is commonly used on 2003–2007 5.9L Cummins and 2007.5–2013 6.7L Cummins applications where equipped. Always verify by VIN or ESN.
Should multiple bolts be replaced at the same time?
When servicing the grid heater assembly, replacing hardware in matched sets is often recommended to ensure consistent clamp load and long-term reliability.
What other parts are commonly replaced during grid heater service?
Grid heater gaskets, dowels, electrical eyelets, wiring repairs, and intake heater components are commonly inspected or replaced during intake heater maintenance.
