Product Overview

This premium main bearing and connecting rod bearing set is engineered for the Cummins 6BT diesel engine, a cornerstone of global heavy-duty applications. Manufactured to exacting OEM specifications, this 0.50mm undersize set is the critical solution for engine rebuilds and overhauls requiring precision machining. We supply directly to distributors, workshops, and fleet operators worldwide, with established logistics to major markets across North America, Europe, the Middle East, and Asia-Pacific.

Key Features & Benefits

• Precision Engineered: Manufactured to exact OEM dimensions (OEM Size) for a perfect fit and optimal oil clearance, ensuring proper lubrication and longevity.
• Enhanced Durability: Constructed from high-grade materials designed to withstand the high loads and pressures inherent in Cummins 6BT diesel operation.
• Optimal Performance: Ensures smooth crankshaft rotation, reduces friction, and maintains proper oil film, contributing to overall engine efficiency and power output.
• Rebuild-Ready: The 0.50mm undersize is specifically for engines where the crankshaft journals have been machined to this specification, restoring engine to factory-like performance.
• Reliable Supply: Backed by consistent inventory and direct-from-factory pricing, ideal for B2B procurement and inventory planning.

Technical Specifications

OEM Cross-Reference

Primary OEM Number: 3939861

This part is manufactured to directly replace the original Cummins bearing set with part number 3939861. Always verify the undersize (0.50mm) matches your engine’s machining specifications before ordering.

Compatibility

Engine Application: Specifically designed for the Cummins 6BT series diesel engines.

Vehicle & Machinery Application: This bearing set is used in a wide range of equipment powered by the 6BT engine, including but not limited to:

• Excavators
• Trucks and Commercial Vehicles
• Forklifts
• Bulldozers
• Buses
• Loaders
• Industrial and Generator Sets

Global Supply & Distribution

We are a professional exporter of heavy-duty engine components with extensive experience in international logistics and trade compliance. Our supply chain is optimized for fast, reliable delivery to key global markets.

• Worldwide Shipping: We ship to all major destinations via air, sea, and express courier.
• Key Markets Served: North America (USA, Canada, Mexico), European Union, United Kingdom, Australia, Middle East (UAE, Saudi Arabia), Southeast Asia, and South America.
• Efficient Logistics: Consolidated shipments to major ports and industrial hubs ensure cost-effective and timely delivery for bulk B2B orders.
• Export Documentation: Full commercial invoice, packing list, and certificate of origin provided. We are experienced in handling customs clearance requirements for diverse markets.

Quality Assurance

• OEM Standards: Produced to meet or exceed original equipment specifications for dimensions, material, and performance.
• Rigorous Testing: Each batch undergoes stringent quality checks. A machinery test report is available to verify compliance.
• Video Inspection: Video outgoing-inspection is provided for quality verification prior to shipment, ensuring you receive exactly what was ordered.
• Warranty Backed: Protected by a 6-month warranty against manufacturing defects, with after-warranty service support for spare parts.

FAQ

Q: How do I confirm this is the correct undersize bearing for my Cummins 6BT engine?

A: The correct undersize (0.50mm) is determined by the machine shop that grinds your crankshaft. You must measure the finished diameter of the crankshaft main and rod journals or consult your engine rebuild sheet. This set is specifically for a 0.50mm (0.020″) undersize application.

Q: Are the main bearings and rod bearings sold together as a complete set?

A: Yes, this listing is for a complete set including both the main bearings (for the engine block) and the connecting rod bearings (for the connecting rods) required for a full 6BT engine rebuild at the 0.50mm undersize.

Q: What documentation is provided with the shipment for international buyers?

A: We provide all necessary export documentation, including a commercial invoice, packing list, and a certificate of origin. For quality assurance, we can also provide the machinery test report and a video of the outgoing inspection upon request to facilitate smooth customs clearance and quality verification.

Our advantages

1.An authorized wholesaler of Isuzu genuine parts, Hino genuine parts, Mitsubishi genuine parts and Mahle parts.

2. We are not only supply genuine parts, but also high quality OEM parts, which are made in China or made in Japan.

3. More than 10 years of experience in machinery parts, professional supply of diesel engine parts.

4. Fast delivery, the fastest can be shipped in one day ,more than 500,000 of different types parts in stock.

5. Scientific ERP system, easy and fast to locate the parts that customer needs.

6. Professional technician checks the parts before delivery, to make sure the parts are correct, usable and defect-free.

Exhibition

Packing&Shipping

1.  Our shipment is by air/sea/express (DHL/FEDEX/TNT/UPS/EMS).

2.  Once we get confirmation of payment, we will ship products in 2 days.

3.  Our packaging is standard export wooden box or others as your requirement.

4. We’ll check and test the products before shipping , and givethe pictures to our customers to confirm.

FAQ

Q1. What is your company major products?

A: Our main products are Liner kit, Piston, Rings, Liner, Gasket kit, Bearing, Injection pump, Nozzle, Water pump, Oil pump,Crankshaft, Turbocharger,Filter, etc.

Q2.What is the MOQ?

A: Normally we can supply any quantity if we have in stock.

Q3. What is your payment term ?

A: We accept Western Union, T/T, Paypal.

Q4. What is the packing ?

A: Carton or wooden case , If you want to put your logo on the packing , We will do it after get your authorization letter.

Q5. When can you deliver products after payment ?

A: By Express ,usually might take 3-4 days ;By Air , Usually take 7-9 days ; By Sea ,usually take 1-2 months .

Q6. What can you do to complete order perfectly ?

A: In the beginning , We will communicate with clients in details to understand what they need .

Before packing , We will check the products and send photos to clients .After confirmation ,

We will packing products well to avoid damage . Once we get tracking number ,

We will send it to customer and keep contact in with clients .