Crankshaft For Cummins 6BT|3929037/3907804

Need a fast, cost-effective alternative to the original crankshaft 3907804/3929037? Our aftermarket Cummins 6BT crankshaft drops straight into any 6BT  block-no machining, no surprises. 

(1)Built for Durability

We don't cast-we forge. Every 6BT crankshaft( 3907804/3929037) starts as 40Cr bar stock, hammer-forged on our 1,600-ton press for a denser grain flow than OEM sand-cast units. That extra toughness keeps turbocharged 4BT3.9 engines turning 3–5 years without the mid-life failures common in cheaper imports. Since we perform forging, machining, and balancing in-house at the same facility, you receive durability matching the original equipment crankshaft while avoiding additional costs and lengthy lead times.

(2)Precision Heat Treatment

Three‑stage treatment: Tempering → Induction Hardening → Stress-Relief Tempering

Achieves surface hardness of HRC 52–58 and a hardened layer depth of 3–5 mm

Delivers excellent wear resistance and core toughness

(3)Journal Accuracy & Balance

Journal surfaces precision-ground to Ra ≤ 0.4 μm and roundness ≤ 0.005 mm

Improves bearing life, reduces vibration, and lowers engine wear

Dynamic balancing ensures smoother operation in both mobile and stationary engines

(4)Quality Assurance

Over 30 inspection checkpoints, including ultrasonic flaw detection and hardness verification

Conforms to ISO9001 quality system standards

Optional third-party inspection reports available upon request

For CUMMINS 6BT crankshaft (3907804/3929037) , we offer our customers a choice of different types of packaging boxes: plywood and crude wood.

Logistics: Global delivery with reinforced sea freight packaging

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