Turning Bearing 316 Stainless Steel Precision CNC Machining Parts for Auto

Product Highlights

Precision CNC turning auto bearing components manufactured from 316 austenitic stainless steel (UNS S31600, EN 1.4401); molybdenum‑alloyed grade delivering excellent pitting & chloride corrosion resistance for special automotive bearing assemblies.

High‑precision CNC lathe turning process, tight dimensional tolerance, fine surface roughness; strict control for roundness, concentricity and run‑out to guarantee smooth bearing rotation performance.

Good ductility, stable dimensional accuracy after machining; maintains reliable mechanical performance under humidity, salt‑spray and alternating temperature automotive working environments.

Fine machinability for complex bearing geometry: inner race, outer race, bearing sleeves, locating shafts and custom bearing accessories; full‑finish processing strictly following customer CAD drawings.

Manufactured in compliance with ASTM A276 and automotive component quality standards; supports batch production and prototype trial‑run; SGS third‑party inspection available.

Long service life for special automotive bearing parts: new‑energy vehicle auxiliary assemblies, off‑road vehicle, coastal‑area automobile and anti‑corrosion auto bearing modules.

Product Overview

This series of 316 stainless steel precision CNC turning bearing parts are custom‑machined auto bearing core components. Using premium solid 316 stainless steel bar stock as raw material, workpieces are processed by multi‑axis CNC turning, grinding, deburring and passivation surface treatment.

Different from ordinary carbon‑steel bearing parts, 316 stainless steel adds molybdenum element, showing outstanding resistance to moisture, salt fog and weak corrosive media. The products cover bearing inner rings, outer sleeves, bearing spacer sleeves, locating pins and shaft sleeves for special‑purpose automobiles. Strict concentricity and roundness control reduce friction during bearing operation. Widely used for new‑energy vehicles, coastal‑region vehicles and special off‑road automotive anti‑corrosion bearing systems.

Material Grade Characteristics – 316 Stainless Steel (UNS S31600 / EN 1.4401)

• Molybdenum‑containing austenitic stainless steel for corrosion‑resistant precision mechanical components.
• Excellent resistance to salt‑spray, moisture, chloride and weak acid media, suitable for automotive parts exposed to harsh atmospheric environment.
• Good toughness at low‑temperature condition; stable mechanical property within continuous service temperature ‑20 ~ 450℃.
• Acceptable machinability for high‑precision turning, grinding and complex profile machining.
• Good weldability for assembly repair; passivation treatment further improves surface anti‑corrosion performance.
• Specially applied for auto bearing parts requiring both precision dimension and anti‑corrosion capability.

Chemical Composition (Weight %)

表格

Mechanical Properties (Annealed Bar Condition ASTM A276)

表格

Note: Hardness can be adjusted by cold‑working for partial bearing applications; actual values shown on batch mill test report.

Related Material Grades

• Stainless Steel Series: 303, 304, 304L, 316L, 440C
• Alloy Steel for Bearing: 52100, 4140, 4340
• Duplex Stainless Steel: 2205
• Nickel‑Base Alloy: Inconel 600, Inconel 718
• Copper & Aluminum Alloy: Brass, 6061‑T6 Aluminum

Key Advantages

1. High‑Precision Turning Dimensional Stability Multi‑axis CNC turning ensures tight tolerance for diameter, concentricity and roundness; low run‑out error to meet smooth rotation requirement of auto bearing assemblies.
2. Superior Salt‑Spray & Corrosion Resistance Molybdenum‑alloyed 316 material performs well under salt fog and humid environment; avoids rust failure for automotive bearing working in coastal and de‑icing‑salt road conditions.
3. Complex Geometry Custom Machining Capacity Support inner race, outer sleeve, spacer, shaft pin and other irregular bearing feature processing; fully produce finished parts per customer drawing without secondary rework.
4. Flexible Production for Prototype & Mass Batch Accept small trial‑order prototype samples and large‑volume serial auto‑parts production; unified quality control for both R&D samples and bulk orders.
5. Automotive‑Grade Complete Quality Verification Each batch implements dimensional inspection, surface roughness check, material spectral analysis; can provide salt‑spray test report for corrosion‑resistance validation.

Typical Applications

• New‑energy vehicle auxiliary corrosion‑resistant bearing inner & outer sleeves.
• Coastal‑region automobile special bearing assembly components.
• Off‑road vehicle and engineering auto anti‑rust bearing shaft & spacer parts.
• Automotive sensor module bearing locating pins and shaft sleeves.
• Special modified‑car corrosion‑resistant rolling bearing accessories.
• Automobile exterior exposed mechanical bearing precision turning parts.

Processing Service

We provide integrated bar cutting, CNC turning, grinding and full‑finish precision machining services, produce finished auto bearing parts strictly according to customer CAD/PDF drawings:

• Bar stock cutting, blanking and stress‑relief treatment.
• Multi‑axis CNC turning for inner‑hole, outer‑diameter, groove, chamfer and thread features.
• Cylindrical grinding, surface polishing, deburring and sharp‑edge removal.
• Passivation, anti‑rust oil coating and surface protective treatment.
• Sorting, full‑dimension inspection and batch marking.

We supply custom precision turning stainless‑steel bearing components for automotive, machinery and equipment manufacturers worldwide.

Quality Assurance

• PMI spectrometer full‑spectrum chemical‑composition analysis per batch raw material.
• Dimensional inspection by micrometer, caliper, CMM for tolerance, concentricity and run‑out.
• Surface roughness testing and visual surface defect inspection.
• Salt‑spray corrosion test available upon customer requirement.
• Hardness measurement for material status verification.

Mill Test Certificate EN 10204 3.1 can be provided together with shipment documents before delivery. Third‑party inspection witness is available upon request.

Packing & Delivery

Packing

• Inner packaging: Anti‑rust oil coated, separated by anti‑rust paper, packed into waterproof polybag to avoid scratch and oxidation.
• Outer packaging: Reinforced export cardboard box or fumigated wooden case for long‑distance sea and land transportation.
• Custom special packaging available on customer request for batch auto‑parts shipment.

Lead Time Normally 15‑30 working days after receipt of advance payment. Exact delivery time depends on part complexity, order quantity, tolerance requirement and third‑party inspection schedule.