Product Description
The Cummins 3946377 OEM Hexagon Head Cap Screw is a genuine Cummins fastener used across multiple B-Series and ISB engine assemblies found in Dodge Ram Cummins platforms. This bolt is engineered to meet OEM tensile strength, thread accuracy, and clamping specifications—ensuring dependable retention in high-vibration, high-temperature diesel environments. Whether replacing worn hardware, restoring factory components, or performing a professional engine service, this genuine Cummins screw guarantees the reliability and fitment that aftermarket hardware cannot match.
Fitment
- Dodge Ram trucks equipped with Cummins B-Series / ISB engines
- Applicable to various brackets, housings, covers, and accessory components
- Fits 5.9L 12V, 5.9L 24V ISB, and early 6.7L ISB depending on assembly location
Note: Cummins hardware often serves multiple engine assemblies. Verify with your engine serial number (ESN) to confirm exact installation points.
Cross-Reference (Cummins-Only)
Related Cummins hardware and service components:
• Cummins 3900625 OEM Hex Flange Head Cap Screw
• Cummins 3900267 OEM Tappet Cover Bolt Grommet Seal
• Cummins 3915104 OEM Regular Hexagon Nut – Throttle/Lever Hardware
FAQ
Where is the Cummins 3946377 screw used on the engine?
This OEM bolt appears in multiple assemblies such as accessory brackets, housings, and structural mounting points across B-Series and ISB engines. ESN confirmation is recommended.
Can I replace this OEM screw with a generic hardware-store bolt?
No. Cummins hardware meets strict torque, hardness, and coating specifications. Using generic hardware may cause improper clamping or component failure.
Does this fit both 5.9L and 6.7L Cummins engines?
Yes — in select locations. The 3946377 screw appears across 5.9L 12V, 5.9L 24V ISB, and early 6.7L ISB applications depending on specific assemblies.
Should these screws be replaced during component servicing?
Yes. Cummins recommends replacing hardware that is stretched, corroded, or exposed to repeated torque cycles to maintain factory clamping force.
Specifications for cummins 3946377
| Specification | Value |
|---|---|
| Brand | Cummins Genuine Parts |
| Part Number | 3946377 |
| Component Type | Hexagon Head Cap Screw (OEM Fastener) |
| UPC | Not Published |
| GTIN | Not Published |
| Cross Reference | Used across multiple B-Series and ISB assemblies |
| E-Codes | N/A |
| Shipping Weight | 0.05 lbs |
| Package Dimensions | 1 x 1 x 1 in |
| Prop 65 Warning | Not Applicable |
