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Electric Power Steering Shaft For Vehicles

This steering system component functions as the primary rotational interface between the EPS motor and the steering gear, converting electrical torque into mechanical assist force. Our manufacturing approach is strictly build-to-print: every dimension, tolerance, and surface characteristic is executed exactly as specified in customer engineering documentation. Through tightly controlled grinding and turning operations, we routinely hold roundness to 2µm and runout to 5µm at designated bearing locations, effectively eliminating geometric irregularities that could compromise bearing fit or introduce operational vibration. The result is a shaft that supports quiet, responsive steering characteristics and sustained reliability under normal service conditions.

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    Specificationscharacteristic parameter

    Product Specifications

    Customizable sizes and profiles available upon request

    Material

    40Cr or other material specified per drawing

    Heat Treatment

    As specified per drawing

    Key Precision Tolerances

    Roundness ≤ 2µm / Runout ≤ 5µm (at critical journal positions)

    Application

    EPS (Electric Power Steering) systems for vehicles

    Operating Environment

    High temperature, high humidity, corrosive conditions

    Product RoleApplication Scenarios

    These shafts are integrated into the steering columns and rack assemblies of modern passenger vehicles, where they transmit motor-driven torque to facilitate low-effort maneuvering. Our production follows customer-provided designs and supports a wide array of automotive segments:

    ● Mainstream sedan and hatchback models

    ● Crossover and off-road utility vehicles

    ● Next-generation battery electric platforms

    ● Hybrid drivetrains requiring variable assist mapping

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      Steel sheet uncoiling

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      Steel sheet uncoiling

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      Purlin fabricating

      choose ussolutions

      Our role is that of a precision manufacturing partner, not a design house. We accept customer engineering prints and convert them into finished shafts through a combination of automated CNC turning, cylindrical grinding, and optional surface finishing operations. Critical features – including shaft diameters, step transitions, spline forms, groove locations, and bearing seat geometries – are all produced to print-specified values. The tight roundness and runout figures (2µm and 5µm respectively) are achieved through careful process parameter selection and in-process gauging, ensuring that every part leaving our facility satisfies the tolerance requirements defined by the customer.

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      SummaryAutomotive Industry System

      Our quality management system operates under IATF 16949 certification. Each production lot undergoes final inspection covering all print-designated criteria: dimensional conformance, geometric roundness and runout measurement, hardness verification, and surface texture evaluation. Documentation packages are available upon request.


      In essence, our EPS shaft product delivers precision execution of customer designs, combining robust machining capability with rigorous quality discipline. This makes us a reliable source for steering system components across the evolving automotive landscape – from conventional powertrains to fully electric architectures.

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