Crafted from premium 40Cr alloy steel, our CAT C7 crankshaft (Part No. 271-5658) delivers outstanding mechanical properties far superior to traditional cast iron alternatives. It boasts a 27.9% increase in tensile strength and a 78.6% improvement in yield strength, ensuring greater resistance under high load conditions.
Each crankshaft undergoes a precision induction hardening treatment, forming a 3–5 mm hardened surface layer with a hardness of HRC 52–58. This process enhances wear resistance by 15% compared to nitrided cast iron crankshafts, making it ideal for long-term use in demanding engine environments.

Designed with both performance and longevity in mind, our crankshafts are trusted by global distributors and aftermarket professionals seeking consistent quality and reliability.

Product Specifications

ENGINE NO	C7	Gross weight(kg)	65
OEM/PART NO	271-5658	Length(mm)	863.5
Crankshaft Material	Forged steel 40Cr	Main journal(mm)	90
Engine type	diesel engine	Crankpin journal(mm)	70
Application	CAT C7	Stroke(mm)	127
Anti-rusty Coating	Yes	Hardness(HRC)	HRC52-58

Product Advantages

(1)Material Advantage: Forged Steel--40Cr
Data Comparison:Forged Steel vs. Cast Iron

Index	Our Forged Steel Crankshaft	Market Cast Iron Crankshaft	Customer Value
Tensile Strength	≥1000MPa	≤785MPa	Suitable for high-load conditions
Wear Life	3-5 years (heavy load)	1-2 years	Reduces maintenance costs
Low-Temp Toughness	AKV≥25J (-40℃)	AKV≤12J	Adapts to extreme climates (Russia, etc.)

(2)Medium Frequency Quenching (Heat Treatment)

CAT C7 crankshaft is treated with medium-frequency quenching and tempering, leaving quenching marks on the surface, with a quenching layer depth of 3–5 mm.

C7 crankshaft

(3)Full-Process Quality Inspection

Magnetic particle inspection (crack detection) + ultrasonic testing (internal defects) + hardness testing (ensuring HRC 52-58), fully compliant with ISO 9001:2015

C7 crankshaft ISO certification

Factory Strength

The factory has 18 years of professional experience in the production of forged steel crankshafts and has obtained a number of national invention patents.

It is equipped with advanced equipment such as CNC lathes and turning and milling composite centers to ensure the machining accuracy of CAT C7 crankshaft (shaft neck roundness ≤ 0.01 mm).

Production Application

Compatible models for CAT C7 crankshaft：

INDUSTRIAL ENGINE & TRUCK ENGINE：C7

EXCAVATOR：320

WHEEL LOADER：962H

product-1460-234

Product packaging

For CAT C7 crankshaft, we offer our customers a choice of different types of packaging boxes: plywood and raw wood.

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FAQ (Answering Common Questions)

Q: What level of quality does your company's product achieve?

A: We have obtained ISO certification.

Q: What is the delivery time of your products?

A: In general, the delivery time of our products is about 25 days, customized products will be delivered as the negotiation with our clients.

Q: Can the forged steel crankshafts be customized as our need, such as put on our logo?

A: Of course, we offer customization services. Crankshafts can be customized according to your requirements.Put on your logo is also available.

Q: How do you ensure that the crankshafts are not damaged during the long transport cycle?

A: Each CAT C7 crankshaft is wrapped in oil paper and then individually packed in a wooden box to ensure that the product is delivered to the customer in good condition.

Q: What payment methods does your company accept?

A: Generally, our company only accepts 100% wire transfer (T/T) payments completed before shipment.

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