Precision CNC Machining Services Specializing In Passivated 40Cr Alloy Steel For Assembly

15+ Years of Experience on CNC Machining:

With 15+ years in custom CNC precision machining services, JINGXIN has honed expertise in crafting parts tailored for assembly scenarios—including a focus on passivated 40Cr alloy steel components. Located in Dongguan City, China, our professional team adopts rational manufacturing processes, targeted solutions, and meticulous workmanship to supply high-quality one-stop custom CNC precision machined parts. These include passivated 40Cr alloy steel parts (optimized for assembly compatibility) alongside parts made of stainless steel, aluminum, iron, and more.

We Focus on:

Custom non-standard CNC precision machining services & milling parts, with specialized experience in passivated 40Cr alloy steel components designed for assembly. 40Cr alloy steel’s inherent strength and the anti-oxidation property of passivation make it ideal for assembly-critical parts such as:

•Assembly shafts and bushings (needing tight fit with other components)

•Connecting flanges (requiring corrosion resistance to avoid assembly jams from rust)

•Positioning pins and fasteners (relying on dimensional stability for repeatable assembly)

Our product scope also covers fittings, valves, hydraulic components, electric motor parts, transmission and pump parts, sprocket wheels, wear parts on packing machines, and electronic and medicinal pieces.

Our Advantage:

1.Advanced Equipment: We operate a world-class facility equipped with a variety of precision CNC machines (Brother, HAAS, Mazak), vertical milling centers, and precision milling and turning lathes (including 3-axis, 4-axis, and 5-axis models). Our equipment is optimized for machining 40Cr alloy steel—its medium carbon content requires stable cutting forces to maintain assembly-friendly tolerances, while our specialized tools minimize surface burrs (a key factor in smooth assembly). We also have in-house passivation equipment to ensure uniform anti-corrosion coating on 40Cr parts.

2.Complete Machining Capability In-House: We adhere to the ISO 2768-F/M machining standard for tolerances, producing parts in a wide range of sizes and complexities—from small passivated 40Cr assembly pins to large connecting components. This precision ensures our 40Cr parts fit seamlessly with other assembly components, reducing on-site adjustment time. Maximum CNC milling capability is detailed in the list below.

3.Raw Material: We guarantee 100% compliance of all materials with RoHS standards and your design specifications. For 40Cr alloy steel parts (core for assembly scenarios), we select high-purity billets with controlled carbon content (0.37-0.45%) to balance strength and machinability—critical for creating assembly parts that withstand repeated fitting. Passivation treatment further enhances these parts by forming a thin oxide layer, preventing rust during storage and assembly. We provide material certificates, SGS reports, and passivation layer test reports (verifying anti-oxidation performance) upon request. Our material range also includes steel, aluminum, stainless steel, titanium, and engineering plastics (e.g., PEEK, PC, POM); more details refer to the list below.

4.Order Quantity: We accept orders starting from 1 unit, supporting both short-run precision CNC milling & turning and large-volume production—whether you need a small batch of passivated 40Cr parts for prototype assembly or mass-produced components for bulk assembly lines.

5.Quick Turnaround: We provide quotes within hours and fast delivery in days, backed by a skilled and professional R&D team. Even for passivated 40Cr parts (requiring an extra anti-corrosion step for assembly readiness), we streamline workflows to ensure you receive parts in time for your assembly schedule.

6.Our Customers: Our customers are from the EU and North America, many operating in industrial equipment and automotive assembly sectors. They rely on our passivated 40Cr alloy steel parts for their dimensional accuracy (ensuring smooth assembly) and corrosion resistance (protecting parts during assembly and storage).

Quality Assurance:

What we do to ensure you receive high-quality CNC Precision Machining parts from JINGXIN: We declare here that we will be responsible for our precision machined parts at all times—especially for passivated 40Cr alloy steel parts, where quality directly impacts assembly efficiency and end-product reliability.

1.100% inspection before shipping: For passivated 40Cr alloy steel parts, we conduct specialized tests—including dimensional checks with coordinate measuring machines (CMM) to confirm assembly fit, and salt spray tests to verify passivation’s anti-corrosion effect. An inspection shipment report for each piece of precision CNC milling part is available. We implement ISO quality control throughout the whole production process, from 40Cr material incoming checks to passivation final inspection.

2.We have served Volvo Auto Corp since 2016 as an approved precision CNC milling company in China (supplying high-precision auto assembly parts), and we also have a 5-year+ track record of providing passivated 40Cr alloy steel components to EU-based industrial assembly brands—with no complaints about assembly compatibility or passivation quality so far.

3.In case any precision machined part (including passivated 40Cr alloy steel parts) is outside tolerance (affecting assembly fit) or fails to meet passivation requirements, we will remake and deliver them as fast as we can, 100% free from our side.

4.Over the past years, JINGXIN CNC Milling Company has manufactured thousands of pieces of precision CNC machined components for our customers—including tens of thousands of passivated 40Cr alloy steel parts for assembly use. The 99.9% satisfaction feedback (especially regarding how our parts simplify assembly and reduce rework) drives us to supply more quality precision machined parts to meet customer's request.

JINGXIN was founded in 2015 to serve the growing market of Custom CNC machining parts for the Automotive industry, Car production line special equipment market, primarily for Industry, Power generation, Automotive equipment, Lightning, Appliances, Medical equipment and Tool sector. JINGXIN Offer its professional CNC manufacturing services (CNC machined parts) to top-rated international clients, primarily for export to the USA and EU countries. JINGXIN has been able to maintain, expand and diversify its prestigious international clients with its excellent quality of products. JINGXIN is located in Dongguan China. Which is named world-class manufacturing city. With a factory of over 2000 square meters.

we are trusted by most famous clients such as BMW(Germany), VOLVO (Sweden), NFL(USA), etc.

150+ skilled workers inside, especially 20+ experienced engineers, as well as well-trained international sales staff, they are combined into a team group one by one. All of your project’s details & questions can be quickly and professionally feedback.

JINGXIN offers three main manufacturing processes:

3/4/5 Axis CNC milling services   (CNC machining work range maximum 2000.00 with accuracy +/-0.001mm)

CNC turning services 

Customized manufacturing per design (sheet metal, welding, assembly.etc )

JINGXIN Advantage & Clients Benefits

• Increase your production levels with more competitive costs. By adopting advanced CNC machines, other equipment, and ISO 9001 quality control system, you control costs and turnaround times, and you can also afford some flexibility as opposed to outsourcing the work.
• Meet the needs of your industry. For that reason, our high-quality custom manufacturing services produce outcomes that apply to industrial standards.
• No need for more vendors or outsourcing. We are your one-stop-shops for CNC Rapid Prototyping, Vacuum Casting, CNC Machining services, Plastic injection molding and Tooling, Sheet Metal Fabrication etc.
• Short-run production or 10000+ production. Applications include parts for Auto parts, medical, industry.
• Typical tolerance range from +/- 0.01mm-0.05mm;
• The Fast lead time within 10-15 working days.