Product Description
Cummins 3915104 — Regular Hexagon Nut (OE Fastener)
MPN: 3915104 | Also Known As: plain hex nut, regular hex nut | Use: OE hardware on Cummins B-Series/ISB assemblies (placement varies by ESN/IPL)
Why This Part
- ✓ OE fit & thread for correct engagement with factory studs/bolts.
- ✓ Drop-in replacement for worn or missing hardware on B-Series/ISB engines.
- ✓ Designed for diesel engine environments—heat, vibration, and load.
- ✓ Sold individually so you can order the exact quantity needed.
Quick Specs
| Type | Regular Hexagon Nut (plain hex) |
|---|---|
| OE Part # | 3915104 |
| Platform | Cummins B-Series / ISB (select assemblies) |
| Qty Required | As needed (sold individually) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| Various (see notes) | Cummins B-Series 5.9 / ISB (select assemblies) | Ram 2500/3500 & industrial (verify by ESN/IPL) |
Notes: Cummins documents this nut on non-certified 5.9L B-Series engines and other B/ISB applications. Exact placement varies—always confirm by Engine Serial Number (ESN) and parts catalog (IPL).
Often Paired With
- Matching OE studs/bolts and washers (per IPL)
- Anti-seize compound where specified
- Torque spec per Cummins service manual
What’s In The Box
- (1) Genuine Cummins Regular Hexagon Nut (3915104)
Install Tips
- Match thread pitch/size to your OE fastener; do not mix hardware grades.
- Torque to spec and recheck after initial heat cycle.
- Replace any stretched studs/bolts and deformed nuts.
FAQ
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3915104 supplied as a single regular hexagon nut.
WHAT THREAD SIZE IS THIS NUT?Thread spec can vary by the assembly it’s used on. Match by ESN and the Cummins parts catalog (IPL) for the exact stud/bolt and nut pairing.
WHERE IS 3915104 USED ON THE ENGINE?It appears on select B-Series/ISB hardware locations (e.g., brackets or sub-assemblies). Placement depends on engine build; verify by ESN/IPL.
HOW MANY DO I NEED?Order the count shown in your parts diagram. This listing is sold individually so you can purchase the exact quantity.
WILL THIS WORK ON 6.7L ISB?Some hardware overlaps across B/ISB families. Confirm usage on your specific ESN before ordering.
