What surface finish is required for camshaft bearing journals?

Bearing journals typically require a surface finish of Ra 0.2 to 0.4 micrometers. Anything rougher will rapidly degrade the bearing bush, while a finish that is too smooth may not retain the necessary oil film.

How do factories ensure the accuracy of custom lobe profiles?

Reputable manufacturers use master cams on specialized CNC cam grinders, followed by verification using Coordinate Measuring Machines (CMM) to map the exact lift and duration against the CAD model.

What is the difference between bimetal and trimetal bearing bushes?

Bimetal bushes consist of a steel backing and an aluminum-alloy lining, suitable for modern passenger cars. Trimetal bushes add a copper-lead intermediate layer and a soft overlay, offering superior load capacity and fatigue resistance for heavy-duty or performance engines.

Do automotive parts suppliers hold specific quality certifications?

Yes, serious manufacturers of engine components should hold IATF 16949 certification, which is the global quality management standard specifically for the automotive supply chain.

Camshafts & Bearing Bushes

Source wholesale Camshafts & Bearing Bushes from vetted manufacturers and reliable suppliers in Asia. Built for importers, automotive distributors, and aftermarket brands requiring precision OEM/ODM production, our network delivers high-volume engine components that meet strict global performance and durability standards.

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BF4L 913 Diesel Engine Camshaft

This is a camshaft designed for BF4L 913 diesel engines. It is an essential auto part that controls the timing of valve opening and closing.

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Engine Fuel Pump Camshaft 3973228 for QSL8.9 QSC ISL ISC Engines

This engine fuel pump camshaft is designed for QSL8.9, QSC, ISL, and ISC engine models. It is a critical component in the fuel delivery system, ensuring precise fuel injection timing and volume.

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Engine Camshaft

This camshaft is a critical component in piston engines, responsible for controlling the opening and closing of valves. Typically made from special cast iron or forgings, it is designed to withstand high speeds and torque.

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Engine Camshaft

This rotational shaft is designed for precise control of valve timing in engines. It is suitable for rough and fine turning applications in gear shafts, oil pump shafts, and axle shafts.

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Engine Gear Cam

This engine gear cam is designed for optimal performance and durability. It features precisely machined teeth for efficient power transmission and a cam profile engineered for accurate valve timing.

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Engine Camshaft

The engine camshaft is a critical component for internal combustion engines. It features lobes that actuate valves at specific intervals to manage intake and exhaust.

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Automotive Engine Camshaft

High-performance camshafts designed for automotive engines. These camshafts are precision-engineered to optimize valve timing and improve engine performance.

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Internal Combustion Engine Camshaft

This high-performance camshaft is designed for internal combustion engines. It is precision-engineered for optimal valve timing and increased engine performance.

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Automotive Roller Bearing

This roller bearing is designed for automotive applications, handling both radial and axial loads. Its robust construction uses high-quality materials to ensure smooth operation and a long service life.

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Automotive Engine Camshaft

This automotive engine camshaft is crafted from nodular cast iron for high strength and wear resistance. It is designed for use in 4-stroke motorcycle engines, providing pressure, heat, and abrasion resistance.

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Nodular Cast Iron Camshaft for 4-Stroke Engines

This camshaft is constructed from durable nodular cast iron for enhanced wear resistance. It is specifically designed for use in 4-stroke motorcycle engines, providing optimal performance.

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Automotive Bearing

This auto bearing is designed for automotive engine systems. It is suitable for use in camshaft applications.

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4Jx1 Engine Camshaft

This camshaft is designed for 4Jx1 engines. It is precision-engineered for optimal valve timing and improved engine performance.

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Engine Camshaft for Performance Enhancement

This high-performance camshaft is designed for enhanced engine performance. Precision-engineered with optimized lobe profiles, it increases valve lift and duration for improved horsepower and torque.

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Camshaft Bearing Bushing for Auto Engines

This cylindrical bushing is made for use in automotive camshaft assemblies. It provides a bearing surface, which reduces friction and wear during engine operation.

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Automotive Camshaft

Precision-engineered camshafts are designed for optimal steering and transmission performance. The durable construction and precise lobe profiles ensure smooth and efficient operation.

OEM Specification MatchedHigh Durability

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Cam Bushing Sleeve

This cam bushing sleeve provides a bearing surface for camshafts within an engine. The cylindrical component features a bronze-colored inner lining and a silver-colored outer surface.

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Engine Camshaft

A camshaft is a rotating shaft containing lobes that convert rotational motion to reciprocal motion. In an internal combustion engine, the camshaft opens and closes the engine's valves.

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Sourcing critical engine timing components like camshafts and bearing bushes requires strict adherence to metallurgical and dimensional tolerances. Because these parts dictate valve timing and engine longevity, even minor deviations in lobe profiles, journal diameters, or bearing clearances can lead to premature wear or catastrophic engine failure. Successfully importing these components in bulk means validating factory capabilities well before production begins.

Material Specifications & Selection

The foundation of a reliable camshaft or bearing bush lies in its metallurgy. Buyers must specify the exact material composition based on the target application—whether standard aftermarket replacement, heavy-duty commercial use, or high-performance upgrades.

Material Type	Primary Application	Characteristics
Chilled Cast Iron	Standard passenger vehicles	Excellent wear resistance on lobes, cost-effective for high volume
Forged Steel (Billet)	Performance & commercial diesel	High tensile strength, requires advanced heat treatment
Bimetal (Bushes)	Standard engine bearings	Steel backing with aluminum/tin alloy, good embeddability
Trimetal (Bushes)	Heavy-duty & high-load engines	Steel back, copper/lead middle, soft overlay for extreme durability

When developing custom profiles, ensuring the factory has the right engineering capability is essential. Utilizing specialized OEM/ODM Services ensures your exact lobe lift, duration, and material specs are accurately translated into production tooling.

Manufacturing Tolerances and Quality Control

The manufacturing process for camshafts involves rough casting or forging, followed by precision CNC grinding of the journals and lobes. Heat treatment, typically induction hardening, is critical to achieve the necessary surface hardness (usually HRC 45 to 60, depending on the material) while maintaining a ductile core.

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Defects often occur during the grinding or heat-treatment phases. Micro-cracking, improper hardening depth, or poor surface finish (Ra values) on the bearing journals will cause rapid friction failure.

Critical QC Checks for Camshafts & Bushes

CMM (Coordinate Measuring Machine) verification of lobe profiles and base circle runout.
Hardness testing (Rockwell/Brinell) on lobes and journals to verify heat treatment depth.
Surface roughness profiling (Ra) on bearing contact areas to ensure proper oil film retention.
Magnetic particle inspection (MPI) to detect micro-cracks post-grinding.
Crush height and wall thickness measurements for bearing bushes.

To mitigate these risks, professional Quality Control & Inspection at the factory level—both in-line and pre-shipment—is non-negotiable for high-volume automotive parts.

Sourcing Mechanics: MOQs, Lead Times, and Pricing

Pricing for camshafts and bushes is driven by material costs, machining complexity, and order volume. Tooling costs for new cast iron molds or forged dies can be significant, making volume commitments necessary to amortize the initial investment.

300 - 500

Typical MOQ (Pcs)

Per SKU for standard OEM production runs.

45 - 60

Production Lead Time (Days)

Standard turnaround, excluding new tooling.

30 - 45

Tooling Development (Days)

Time required for new molds or CNC programming.

Before committing to tooling fees, conducting thorough Factory Audits is highly recommended. You need to verify that the manufacturer actually owns the CNC grinders and heat-treatment facilities, rather than outsourcing these critical steps to unverified sub-tier workshops.

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Frequently Asked Questions

Sourcing engine timing components at scale requires balancing cost with uncompromising dimensional accuracy. By partnering with vetted manufacturers who possess end-to-end control over casting, machining, and metallurgy, you can build a resilient and profitable automotive supply chain.

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