Product Description
Interstate-McBee M-3900630 Hexagon Flange Head Cap Screw – 5.9L/6.7L Cummins
OE-style hexagon flange head cap screw that secures the turbo oil drain tube to the turbocharger on Cummins B-Series engines. Sold individually; 2 required per vehicle. Built to OEM dimensions for a precise fit and reliable sealing when servicing the drain tube assembly.
- Direct replacement: Matches Cummins 3900630 usage on B-Series applications.
- Application-specific: Designed for the turbo oil drain tube-to-turbo connection on 5.9L/6.7L platforms.
- Clean, consistent clamping: Flange head distributes load and helps maintain seal integrity.
- Aftermarket value: Interstate-McBee quality at a lower cost than OEM-boxed hardware.
Specifications
| Interstate-McBee Part # | M-3900630 |
|---|---|
| OEM Reference | Cummins 3900630 |
| Thread Size | M8 x 1.25 |
| Length | 20 mm |
| Head Style | Hexagon flange head (cap screw) |
| Position / Usage | Turbo oil drain tube to turbocharger |
| Sold As | Each (quantity 2 required per vehicle) |
What’s Included
- (1) Hexagon flange head cap screw (M-3900630)
Vehicle Fitment
Verify by engine serial number (ESN) when possible.
- Dodge Ram 2500/3500/4500/5500, 5.9L & 6.7L Cummins
- Confirmed primary fitment: 1994–2018
- 1989–1993 note: Early 5.9L applications may differ—verify by ESN/parts catalog before ordering.
Helpful Install Notes
- Clean mating surfaces and threads; replace associated turbo oil drain O-ring when applicable.
- Follow Cummins service manual for torque specs and sequence.
- If threads are damaged or corroded, replace both fasteners as a set.
Recommended Companion Parts
- Turbo Oil Drain O-Ring (Cummins 3928624) – common on 2003–2018 5.9L/6.7L
- Turbo Oil Drain Tube (Cummins 3918585 for 1994–2002; other p/n vary by year)
Warranty
Interstate-McBee new engine parts are covered by manufacturer warranty—typically up to 24 months from installation. Contact us for full terms and coverage details for this item.
Why Buy From CPP Diesel
- Diesel-specialist fitment support with ESN verification
- Fast shipping and easy returns
- Trusted brands including Interstate-McBee and OEM Cummins
FAQ
Is this the correct bolt for the turbo oil drain?Yes—this cap screw is used to fasten the turbo oil drain tube to the turbocharger on B-Series 5.9L/6.7L applications.
How many do I need?
The drain tube uses two (2) bolts—purchase two per vehicle service.
What size is the bolt?
M8 x 1.25 thread, approximately 20 mm length, hexagon flange head.
Will this fit my 1989–1993 5.9L?
Some early 5.9L setups differ. We recommend verifying by ESN and the factory parts catalog for 1989–1993 trucks.
Any related parts I should replace?
The turbo oil drain O-ring (3928624) is commonly replaced at the same time; inspect the drain tube for wear.
Product Videos
Custom Field
YEAR 1989-2018
MAKE DODGE
ENGINE 5.9L,6.7L
