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Help CenterInput Pinion Shaft Splined End 4140 Alloy Steel Heat Treated Precision Turning 6 Spline
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At Henan San Kuang Machinery Technology Co., Ltd., we take pride in delivering high-quality precision components tailored to the rigorous demands of industrial and automotive applications. Our Input Pinion Shaft with Splined End, machined from 4140 alloy steel and subjected to thorough heat treatment, exemplifies our commitment to durability, accuracy, and performance. With over a decade of manufacturing expertise since 2014, a factory spanning 10,000–30,000 square meters, and an annual export value exceeding US$2.5 million, we have the capacity and capability to meet your most stringent specifications. This shaft is precision turned to ensure perfect spline engagement, offering a reliable solution for power transmission systems that require consistent torque transfer and minimal backlash.
The 6-spline design combined with 4140 alloy steel provides an excellent balance of strength, toughness, and wear resistance. Heat treatment further enhances the material's hardness and fatigue life, making it ideal for high-stress environments such as gearboxes, differentials, and heavy machinery. Our precision turning process guarantees tight tolerances and smooth surface finishes, ensuring a seamless fit with mating components and reducing noise and vibration during operation. Whether you need OEM replacements or custom-engineered shafts, our team works closely with you to deliver products that match your exact drawings and performance requirements.
Key Technical Specifications
| Property | Value / Description |
| Material | 4140 Alloy Steel (AISI/SAE 4140) |
| Heat Treatment | Quenched & Tempered (through hardening) |
| Hardness Range | 28–32 HRC (typical; other ranges available) |
| Spline Count | 6 (involute or straight side, per customer specification) |
| Machining Tolerance | ±0.01 mm (typical on critical diameters) |
| Surface Roughness | Ra 0.8 μm (typical; finer finishes available) |
| Length | Customizable (from 50 mm to 1000+ mm) |
| Major Diameter | Customizable (typical range 10–150 mm) |
Product Features & Benefits
- Superior Strength – 4140 alloy steel offers high tensile strength and impact resistance, ensuring the shaft withstands heavy loads and shock without deformation.
- Enhanced Durability – Heat treatment refines the microstructure, increasing wear resistance and extending service life in demanding applications.
- Precision Spline Engagement – Our advanced CNC turning centers produce consistent spline profiles that mate perfectly with hubs and sleeves, reducing backlash and improving efficiency.
- Customizable Dimensions – We accommodate a wide range of lengths, diameters, spline configurations, and end treatments to match your existing assembly or design requirements.
- Versatile Applications – Suitable for use in automotive transmissions, industrial gearboxes, agricultural machinery, mining equipment, and more.
- Reliable Supply Chain – With 51–100 skilled employees and multiple international shipping ports (Shanghai, Lianyungang, Qingdao, Tianjin), we ensure timely delivery to global markets including North America, Europe, Southeast Asia, and the Middle East.
We understand that every application has unique demands. That is why we offer complete flexibility in hardness levels, surface treatments (e.g., black oxide, phosphating, or chrome plating upon request), and additional features such as keyways, threads, or snap ring grooves. Our engineering team reviews each order to ensure that the final product meets or exceeds your expectations.
Since our establishment in 2014, Henan San Kuang Machinery Technology Co., Ltd. has grown into a trusted partner for clients across six continents. Our quality management system is certified to ISO9001, QS9000, and other internationally recognized standards (TS16949, OHSAS18001, SA8000), reflecting our commitment to consistent quality, safety, and social responsibility. We have successfully served customers in over 30 countries, with annual export revenue consistently between US$2.5 million and US$5 million. This track record demonstrates our ability to handle high-volume orders while maintaining strict quality control.
Choosing our Input Pinion Shaft Splined End means investing in a component that will deliver reliable performance over the long term. We back every product with rigorous inspection reports (dimensional checks, material certifications, and hardness testing) to give you full confidence in your supply chain. Contact us today to discuss your specific requirements, request a quotation, or get engineering support. Let us help you achieve optimal drivetrain performance with a precision-crafted 4140 alloy steel shaft built to last.
Frequently Asked Questions
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Why is 4140 alloy steel chosen for input pinion shafts?
4140 steel provides an excellent combination of strength, toughness, and fatigue resistance. When heat treated, it achieves a hardness suitable for high-load applications while retaining enough ductility to prevent brittle failure. -
Can you provide custom spline profiles (e.g., involute vs. straight side)?
Yes, we can manufacture both involute and straight-sided splines according to your drawings or industry standards such as DIN 5480, SAE, or ISO. -
What is the typical lead time for a custom order?
Lead time depends on quantity and complexity. For standard sizes, it is typically 15–25 working days; for highly customized shafts, please consult our sales team for an accurate estimate. -
Do you offer surface treatments to improve corrosion resistance?
Absolutely. Options include black oxide, zinc plating, phosphating, and nickel plating, all available upon request. Please specify your requirement during ordering. -
How do you ensure dimensional accuracy and repeatability?
We use advanced CNC turning centers with in-process gauging and post-process inspection using CMM and optical comparators. A detailed inspection report can be provided with each shipment. -
What is the minimum order quantity (MOQ)?
Our MOQ starts at 50 pieces for custom dimensions, but we are flexible for smaller trial orders. Please contact us to discuss your specific needs. -
Can you supply the shaft with pre-assembled bearings or seals?
Yes, we can integrate additional components as per your assembly requirements. Our team will coordinate with your engineers to provide a subassembly solution. -
Are your products compliant with international standards for export?
We are certified under ISO9001 and QS9000, and our manufacturing processes align with ISO16949 and other relevant standards. We can also provide material certificates and test reports to meet customs and quality expectations.
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