Cummins — Hex Flange Lock Nut M10 Turbo Mount — 3818824
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The Cummins 3818824 is a hexagon flange lock nut used as heavy-duty engine fastening hardware on select Cummins diesel applications. It is commonly used in high-heat mounting locations such as turbocharger-to-exhaust-manifold studs, where the fastener must maintain clamping force under exhaust temperature, vibration, and repeated heat cycling. The integral flange helps spread load at the mounting surface while the locking design helps resist loosening in severe-duty engine environments.
Key Features
- Cummins part number: 3818824
- Product type: Hexagon flange lock nut
- Thread size: M10 x 1.5
- Nut style: Flanged locking hex nut
- Common service location: Turbocharger mounting / exhaust-side engine hardware
- Across-flats measurement: Approximately 0.578"
- Height: Approximately 0.421" / 10.7 mm
- Service environment: High-temperature, high-vibration diesel engine mounting locations
- Function: Secures mounted engine components while distributing clamp load through the flange face
Engine Compatibility
This fastener is commonly associated with select Cummins mid-range diesel engine platforms where the parts diagram calls for part number 3818824, including applications in the following families:
- Cummins 5.9L 6BT / ISB
- Cummins 6.7L ISB / QSB
- Cummins 6C 8.3L
- Cummins ISC
- Cummins ISL
- Cummins QSL
Use only where the Cummins parts diagram, engine serial number, or service manual specifies 3818824 or a confirmed replacement number.
Serial Number Fitment Notice
Fastener fitment should be confirmed by engine serial number, CPL, turbocharger mounting arrangement, stud size, and parts diagram location. Do not select this nut by engine family alone. Similar-looking flange nuts can differ by thread pitch, locking feature, height, material grade, or temperature rating.
When This Part Needs Replacement
Replace turbocharger mounting nuts whenever the turbocharger is removed, the nut shows thread damage, heat distortion, corrosion, galling, rounding, or loss of locking tension. Exhaust-side fasteners are exposed to severe heat cycling and may not retain properly if reused after long service.
This nut should also be inspected during turbocharger gasket replacement, exhaust manifold service, boost leak repairs, or any service where turbocharger mounting hardware is disturbed.
Installation Notes
Clean and inspect the mating stud threads before installing the new nut. Do not force the nut onto damaged, dirty, or cross-threaded studs. If a stud is stretched, pitted, loose, or damaged, replace the stud before final assembly.
Follow the Cummins service procedure for turbocharger installation, tightening sequence, and torque specification. Do not substitute standard hardware in high-temperature turbocharger or exhaust mounting locations unless the replacement is confirmed for the same thread, locking style, and heat-service requirement.
Alternate/Cross-Reference Part Numbers
- Cummins: 3818824
- Detroit Diesel reference: 11506101
- Mack reference: 1543499
- Volvo reference: 471622
Cross-reference numbers should be confirmed against the exact engine, equipment model, and parts diagram before substitution.
Parts Desk Insight
Turbocharger hardware is not a good place for generic nut substitution. Even when the thread size matches, the locking feature, flange face, heat rating, and installed height can matter. Match 3818824 by Cummins engine serial number and diagram location, especially on exhaust-side hardware exposed to repeated heat cycling.
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Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
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