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Crankshafts Parts CNC Machining Services for Automotive

Automotive crankshafts are precision rotating assemblies that convert reciprocating piston motion into rotational power. At Zintilon, we specialize in CNC machining of automotive crankshafts using advanced CNC turning and multi-axis machining to achieve exceptional journal concentricity, surface finish, and dynamic balance.
  • Machining for complex crankshaft profiles
  • Tight tolerances up to ±0.0002 in
  • Precision turning, grinding & journal finishing
  • Support for rapid prototyping and full-scale production
  • IATF 16949-certified automotive manufacturing


Trusted by 15,000+ businesses

Automotive Crankshafts Machining Capabilities

prductivity

Fast Delivery

A professional engineering team that can respond quickly to customer needs and provide one-stop services from design to production in a short period of time to ensure fast delivery.

10x

High Precision

We are equipped with automated equipment and sophisticated measuring tools to achieve high accuracy and consistency, ensuring that every part meets the most stringent quality standards.

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ITAF16949 Certified

As a IATF16949 certified precision manufacturer, our products and services have met the most stringent quality standards in the automotive industry.

From Prototyping to Mass Production

Zintilon provides CNC machining services for automotive crankshafts and related powertrain components for passenger vehicles, racing applications, and commercial automotive projects.

Prototype Crankshafts

Obtain high-precision prototypes of automotive crankshafts that accurately replicate your final design. Test bearing journal accuracy, verify stroke dimensions, and ensure proper balance before full-scale vehicle production.
Key Points:
Rapid prototyping with high precision
Tight tolerances (±0.0002 in)
Test design, material, and balance performance early
3 Axis CNC Machined Stainless Steel Passivation

EVT – Engineering Validation Test

Quickly iterate on crankshaft prototypes to ensure they meet all functional and durability requirements. Identify potential issues early for a smoother transition to full-scale automotive manufacturing.
Key Points:
Validate prototype functionality
Rapid design iterations
Ensure readiness for production
Anodized Aluminum 1024x536

DVT – Design Validation Test

Validate the structural integrity and functionality of crankshafts using various materials and heat treatments to ensure design accuracy and optimal engine reliability before mass production.
Key Points:
Confirm design integrity and strength
Test multiple materials and treatments
Ensure production-ready performance
design aluminium

PVT – Production Validation Test

Verify large-scale production feasibility for crankshafts and identify potential manufacturing challenges before full production begins to ensure consistency and efficiency.
Key Points:
Test large-scale production capability
Detect and fix process issues early
Ensure consistent part quality
Anodized Titanium Fastener

Mass Production

Produce high-quality, end-use crankshafts at scale with precision and speed, ensuring reliable engine performance and on-time delivery for automotive OEMs and aftermarket suppliers.
Key Points:
Consistent, high-volume production
Precision machining for OEM-grade quality
Fast turnaround with strict quality control
production

Simplified Sourcing for
the Automotive Industry

Through excellent processing technologies such as CNC machining, sheet metal manufacturing, metal casting, etc., we can achieve a balance between quality and speed, whether it is special-shaped parts, lightweight or cost effect.

Explore Other Aerospace Components

Discover our full range of precision CNC machined aerospace parts, designed for strength, durability, and exact fit. Explore components for engines, fuselage, tail sections, landing gear, and more to meet every aircraft manufacturing need.

Car Parts
Machining Capabilities

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CNC Machining

sheet metal

Sheet Metal Fabrication

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Wire EDM

casting

Metal Casting

Aerospace
Materials & Finishes

Materials
We provide a wide range of materials, including metals, plastics, and composites.
Finishes
We offer superior surface finishes that enhance part durability and aesthetics for applications requiring smooth or textured surfaces.

Specialist Industries

you are welcome to emphasize it in the drawings or communicate with the sales.

Materials for Crankshafts Components

Our CNC machine shop offers a wide range of materials for Crankshafts Parts Machining for Automotive. With 50+ automotive-grade metals and alloys, we support rapid prototyping and heavy-duty powertrain component manufacturing with consistent precision and OEM-quality standards.
Aluminum Image

High machinability and ductility. Aluminum alloys have good strength-to-weight ratio, high thermal and electrical conductivity, low density and natural corrosion resistance.

Price
$ $ $
Lead Time
< 7 days
Tolerances
Down to ±0.003 mm
Max part size
3000*2200*1100 mm
Min part size
2*2*2 mm
Steel Image

Steel is a strong, versatile, and durable alloy of iron and carbon. Steel is strong and durable. High tensile strength, corrosion resistance heat and fire resistance, easily molded and formed. Its applications range from construction materials and structural components to automotive and aerospace components.

Price
$ $ $ $ $
Lead Time
< 10 days
Tolerances
Down to ±0.001 mm (routing)
Max part size
3000*2200*1100 mm
Min part size
2*2*2 mm
Stainless steel Image

Stainless steel alloys have high strength, ductility, wear and corrosion resistance. They can be easily welded, machined and polished. The hardness and the cost of stainless steel is higher than that of aluminum alloy.

Price
$ $ $
Lead Time
< 7 days
Tolerances
Down to ±0.005 mm
Max part size
3000*2200*1100 mm
Min part size
2*2*2 mm
Titanium Image

Titanium is an advanced material with excellent corrosion resistance, biocompatibility, and strength-to-weight characteristics. This unique range of properties makes it an ideal choice for many of the engineering challenges faced by the medical, energy, chemical processing, and aerospace industries.

Price
$$$
Lead Time
< 10 days
Tolerances
Down to ±0.005 mm
Max part size
3000*2200*1100 mm
Min part size
2*2*2 mm
Bronze Image

Highly resistant to seawater corrosion. The material’s mechanical properties are inferior to many other machinable metals, making it best for low-stress components produced by CNC machining.

Price
$ $ $ $ $
Lead Time
< 10 days
Tolerances
Down to ±0.005 mm
Max part size
3000*2200*1100 mm
Min part size
2*2*2 mm
Brass Image

Brass is mechanically stronger and lower-friction metal properties make CNC machining brass ideal for mechanical applications that also require corrosion resistance such as those encountered in the marine industry.

Price
$$$
Lead Time
< 10 days
Tolerances
Down to ±0.005mm
Max part size
3000*2200*1100 mm
Min part size
2*2*2 mm
Copper Image

Few metals have the electric conductivity that copper has when it comes to CNC milling materials. The material’s high corrosion resistance aids in preventing rust, and its thermal conductivity features facilitate CNC machining shaping.

Price
$$$
Lead Time
< 10 days
Tolerances
Down to ±0.005 mm
Max part size
3000*2200*1100 mm
Min part size
2*2*2 mm
Zinc Image

Zinc is a slightly brittle metal at room temperature and has a shiny-greyish appearance when oxidation is removed.

Price
$ $ $ $ $
Lead Time
< 10 days
Tolerances
Down to ±0.005 mm
Max part size
3000*2200*1100 mm
Min part size
2*2*2 mm
Iron Image

Iron is an indispensable metal in the industrial sector. Iron is alloyed with a small amount of carbon – steel, which is not easily demagnetized after magnetization and is an excellent hard magnetic material, as well as an important industrial material, and is also used as the main raw material for artificial magnetism.

Price
$ $ $ $ $
Lead Time
< 10 days
Tolerances
Down to ±0.005 mm
Max part size
3000*2200*1100 mm
Min part size
2*2*2 mm
Magnesium Image

Due to the low mechanical strength of pure magnesium, magnesium alloys are mainly used. Magnesium alloy has low density but high strength and good rigidity. Good toughness and strong shock absorption. Low heat capacity, fast solidification speed, and good die-casting performance.

Price
$ $ $ $
Lead Time
< 7 days
Tolerances
Down to ±0.005 mm
Max part size
3000*2200*1100 mm
Min part size
2*2*2 mm
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FAQs: Crankshafts for Automotive Applications

Precision CNC manufacturing delivers measurable performance advantages across multiple areas. Accurate bearing journal dimensions and surface finish ensure proper oil film thickness and reduce friction losses for improved efficiency. Precise balance and counterweight positioning eliminate vibration and extend bearing life. Controlled fillet radii and surface treatments reduce stress concentrations and improve fatigue resistance under cyclic loading. Exact stroke dimensions ensure consistent piston motion and proper clearances. High-quality surface finishes on journals reduce wear and extend service intervals. Proper oil hole placement and sizing ensure adequate lubrication to all bearings under high loads and high RPM conditions, while precise concentricity between all journals minimizes vibration and ensures smooth power delivery throughout the RPM range.

Yes. We offer flexible manufacturing capabilities including:
Rapid prototyping for design validation
Low-volume production for specialized applications
High-volume production with consistent quality control
Full structural and dimensional verification at every stage

We routinely achieve tolerances as tight as ±0.0002 inches on bearing journals, ensuring precise roundness within 0.0001 inches, accurate journal concentricity, proper surface finish (typically 8-16 Ra microinches), and correct stroke dimensions for optimal bearing clearances, oil film thickness, and vibration-free engine operation at all RPM ranges.

Crankshaft production utilizes advanced machining technologies including precision CNC turning for main and rod journal machining, multi-axis milling for counterweight profiling and oil hole drilling, centerless grinding for journal surface finish and dimensional accuracy, fillet rolling or grinding for stress concentration reduction at journal transitions, induction hardening for wear-resistant bearing surfaces, and nitriding or shot peening for enhanced fatigue life and surface hardness.

Each material offers distinct advantages for crankshaft applications. Forged steel such as 4340 and EN24 provides superior strength, fatigue resistance, and toughness for high-performance and heavy-duty engines. Cast iron (nodular or ductile iron) offers cost-effective durability for standard passenger vehicle applications with good damping properties. Billet steel delivers maximum strength and allows custom stroke configurations for racing and extreme performance applications where ultimate reliability under high stress is required.

Automotive crankshafts are rotating shafts that convert the up-and-down motion of pistons into rotational motion that drives the transmission and wheels. They feature precision-machined main bearing journals, connecting rod journals (also called crank pins), counterweights for balance, and oil passages for lubrication. Crankshafts are the backbone of engine operation, directly affecting power delivery, smoothness, durability, and overall engine performance
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