Product Description
Interstate-McBee M-3900629 Hexagon Flange Head Cap Screw – 1997.5–2002 5.9L Cummins 24-Valve
OE-style hex flange head cap screw used on 1997.5–2002 Dodge Ram 2500/3500 with the 5.9L Cummins 24-valve (ISB). Built to OE form, fit, and function for reliable service. Sold individually.
- Direct replacement: Matches OE geometry and head/flange profile for proper seating.
- Consistent clamp load: Quality fastener material and threads for repeatable torque.
- Service friendly: Flanged head eliminates separate washer in most locations.
- Value: Interstate-McBee quality at an aftermarket price.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3900629 |
| OEM Reference | Cummins 3900629 |
| Head Style | Hexagon flange head (cap screw) |
| Finish | OE-equivalent protective coating |
| Sold As | Each (1 screw) |
What’s Included
- (1) Hex flange head cap screw, P/N M-3900629
Vehicle Fitment
Always verify by engine serial number (ESN) when possible.
- Dodge Ram 2500/3500 5.9L Cummins (24-valve ISB)
- Model Years: 1997.5–2002
- Additional ISB/B-Series applications where Cummins 3900629 is specified (confirm by ESN).
Install Notes
- Clean threads and mating surfaces; remove old threadlocker and debris.
- Torque to the specification in the Cummins service manual for the exact location.
- If the original location requires threadlocker, reapply per manufacturer guidance.
Why Buy From CPP Diesel
- ESN-verified fitment support from diesel specialists
- Fast shipping, easy returns, competitive pricing
- Deep inventory of complementary ISB/B-Series hardware and gaskets
FAQ
Is this an OEM-equivalent replacement?
Yes. It is designed as an OE-style replacement for Cummins 3900629 and matches the original form and function.
How many do I need?
Quantity varies by the specific location on the engine. Check the Cummins parts diagram or your ESN-specific bill of materials.
Does this include washers or nuts?
No. This listing is for the screw only. If your location requires additional hardware, purchase separately.
