316L Stainless Steel Round Bar for Precision Threading and Long Slender Shafts in Medical Machining Parts
Price:
0.5-20
MOQ:
100 pcs
Delivery Time:
5-8 working days
Brand:
yue lin sen
Product Description
This service encompasses the precision machining of 316L stainless steel round bar into specialized components, focusing on two key processes: high-precision internal and external threading (tapping) and the fabrication of long, slender shafts via CNC milling. Utilizing the superior corrosion resistance and biocompatibility of medical-grade 316L stainless steel, this manufacturing capability produces critical parts for medical, marine, pharmaceutical, and high-precision industrial applications where extended length, dimensional stability, and reliable threaded connections are essential.
Manufacturing Process
Material Preparation
Sourcing certified 316L stainless steel round bar (ASTM A276). Precision cutting to required blank lengths, often including stress-relieving for long shafts.
Long Shaft CNC Milling/Turning
- Primary Turning: CNC lathe turning to achieve precise outer diameters, tapers, and preliminary geometries over extended lengths
- Shaft Milling: Utilizing CNC milling centers (often with live tooling lathes or 4/5-axis mills) to create flats, keyways, slots, splines, or complex profiles along the shaft's length
- Process Stability: Employing steady rests, follower rests, and specialized tooling to minimize deflection and vibration during machining of high-aspect-ratio parts
Precision Threading/Tapping
- Thread Milling: Preferred method for high accuracy and finish. A CNC milling cutter helically interpolates the thread profile into the part. Ideal for large diameters, difficult locations, and both internal/external threads
- Tapping: For smaller or through holes, using rigid tapping cycles on CNC machines with synchronized spindle and feed
- Thread Rolling (for external threads): A cold-forming process that creates stronger, smoother threads by displacing material rather than cutting it
Additional Processing
- Heat Treatment (Optional): Solution annealing for 316L to restore optimal corrosion resistance if cold working has been significant
- Surface Finishing: Deburring & radiusing, electropolishing & passivation to achieve smooth, clean, corrosion-resistant surfaces
- Inspection & Testing: Dimensional verification, thread inspection, material certification review, and optional corrosion testing
Industry Applications
- Medical & Surgical Devices: Implant trial components, long surgical instrument shafts, adjustable mechanism rods, biopsy device parts
- Pharmaceutical & Food Processing: Mixer shafts, agitator arms, valve stems, and connector rods requiring frequent sterilization (CIP/SIP)
- Marine & Chemical Equipment: Pump shafts, valve spindles, level gauge components exposed to aggressive environments
- Precision Machinery & Automation: Guide rods, linear motion shafts, lead screws, and actuator components
- Laboratory & Analytical Equipment: Precision stages, adjustment screws, and structural components
Technical Specifications
| Parameter Category | Specification | Details & Options |
|---|---|---|
| Base Material | Alloy | 316L Stainless Steel (UNS S31603). Low carbon content (<0.03%) for superior corrosion resistance |
| Standards | ASTM A276 (Bar), ASTM A479 (Stainless Steel for Machine Parts), ISO 5832-1 (Implants) | |
| Key Properties | Excellent corrosion resistance (Mo content), good mechanical properties, non-magnetic, biocompatible | |
| Material Form & Size | Form | Round Bar (Rod) |
| Diameter Range | Common: 10 mm - 100 mm diameter. Larger diameters available | |
| Long Shaft Machining | Maximum Finished Length | Up to 1500 mm (longer possible with specialized setups) |
| Diameter Tolerance | Standard: ±0.025 mm. Precision: ±0.01 mm. High-Precision: ±0.005 mm | |
| Straightness Tolerance | Achievable: 0.02 mm per 300 mm or better | |
| Surface Finish (Ra) | Turned: 0.8 - 1.6 µm. Ground: 0.2 - 0.4 µm. Polished: < 0.1 µm | |
| Threading/Tapping | Thread Types | Metric (M), Unified (UNC/UNF), Whitworth, Acme, Buttress, Custom |
| Thread Size Range | Internal: M3 to M30. External: M6 to M80 and larger | |
| Thread Quality Class | Metric: 4H, 5H, 6H (internal); 4g, 6g (external) | |
| Threading Method | Thread Milling (Preferred), Tapping, Thread Rolling | |
| Surface Treatment | Standard Finish | Passivation (per ASTM A967) to maximize corrosion resistance |
| Enhanced Finishes | Electropolishing, Bead Blasting | |
| Production Timeline | Prototype/Small Batch | 4 - 8 weeks (depending on complexity) |
| Production Run | 8 - 14 weeks (volume and complexity dependent) |
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Get in Touch
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Company
Dongguan Yuelinsen Metal Technology Co., Ltd.
Location
Room 203, Building 2, Ande Alley, Changan Town, Dongguan City, Guangdong Province
Contact Person
张年红