304 Stainless Steel CNC Milled Long Shaft Precision Threaded Rod for Medical Devices
Price:
0.5-20
MOQ:
100pcs
Delivery Time:
5-8 working days
Brand:
Yue lin sen
Product Description
304 Stainless Steel CNC Milling Long Axis Threaded Rod
Product Overview
The 304 Stainless Steel CNC Milled Long Shaft Threaded Rod is a precision-engineered linear component manufactured from solid 304 stainless steel bar stock using advanced CNC milling and turning processes. Characterized by its extended length, precise external threading, and straightness, this rod is designed for applications requiring a combination of tensile strength, corrosion resistance, and accurate linear motion or fastening over considerable distances. CNC-machined construction ensures consistent thread quality, dimensional accuracy, and superior surface finish along the entire length.
Manufacturing Process
- Material Preparation: Sourcing and cutting certified 304 stainless steel round bar to required blank length, including stress-relieving for long rods to minimize machining distortion
- CNC Turning (Primary): Machining the entire rod on precision CNC lathes to achieve target outer diameter with consistent straightness using steady rests and follow rests
- Thread Milling (Preferred Method): Using thread milling cutters on CNC mills or lathes with live tooling for superior accuracy, surface finish, and custom thread forms
- Secondary Milling Operations: Adding flats, grooves, keyways, cross-holes, or other non-cylindrical features using CNC milling
- Heat Treatment (Optional): Solution annealing to relieve machining stresses for very long or precision-ground rods
- Straightening & Precision Grinding: Centerless grinding for applications requiring exceptional straightness or diameter tolerance
- Surface Finishing: Standard passivation per ASTM A967, with electropolishing available for enhanced corrosion resistance
- Inspection & Measurement: Comprehensive verification of length, diameter, thread pitch, and straightness using thread gauges and optical comparators
Applications
Precision Machinery & Automation
Lead screws, actuator shafts, guide rods, and ball screw pre-load adjusters in linear motion systems
Lead screws, actuator shafts, guide rods, and ball screw pre-load adjusters in linear motion systems
Medical & Laboratory Equipment
Adjustment rods, structural supports, and precision positioning components in imaging devices and surgical tables
Adjustment rods, structural supports, and precision positioning components in imaging devices and surgical tables
Food & Beverage Processing
Conveyor system components, mixer shafts, and adjustment mechanisms requiring corrosion resistance and cleanability
Conveyor system components, mixer shafts, and adjustment mechanisms requiring corrosion resistance and cleanability
Marine & Chemical Equipment
Valve stems, pump shafts, and tie rods in corrosive environments
Valve stems, pump shafts, and tie rods in corrosive environments
Optical & Photonic Mounting
Precision posts and adjustment rods for lens, mirror, and laser mounting systems
Precision posts and adjustment rods for lens, mirror, and laser mounting systems
Architectural & Display Systems
Structural tension rods, curtain rail supports, and display mount components
Structural tension rods, curtain rail supports, and display mount components
Technical Specifications
| Parameter Category | Specification | Details & Options |
|---|---|---|
| Material | Alloy | 304 Stainless Steel (UNS S30400, ASTM A276). Excellent corrosion resistance, good strength, non-magnetic when annealed. |
| Manufacturing Method | Process | CNC Machined from Solid Bar Stock. Superior dimensional control and thread quality vs. rolled threads. |
| Thread Specifications | Thread Type | Metric (ISO): M4, M5, M6, M8, M10, M12, etc., with standard pitch. Unified (ANSI/ASME): 1/4-20, 5/16-18, 3/8-16, 1/2-13, etc. Acme, Trapezoidal, or Custom Threads available. |
| Thread Quality Class | Metric: 6g (external, standard), 4g6g (tighter). Unified: 2A (standard), 3A (high precision). |
|
| Thread Length | Can be full length or a specified partial length of the rod. | |
| Dimensional Specifications | Rod Diameter (Major Diameter) | Common Range: 3 mm (M3) to 50 mm (M50 or 2") and larger. |
| Overall Length | Key Capability: Long shaft machining. Typical range from 100 mm to 2000 mm. Longer lengths possible with specialized equipment. | |
| Straightness Tolerance | Critical for long rods. Standard Machined: 0.1 mm per 300 mm. Precision Ground: 0.02 mm per 300 mm. |
|
| Tolerances | Diameter Tolerance | Standard: h11 or h9 (ISO). Precision: h7 or h6. |
| Thread Pitch/Diameter Tolerance | As per the specified thread class (e.g., 6g, 2A). | |
| Mechanical Properties (Typical, Annealed) | Ultimate Tensile Strength | 515 MPa (75 ksi) min |
| Yield Strength (0.2% Offset) | 205 MPa (30 ksi) min | |
| Elongation | 40% min | |
| Surface Finish | As-Machined/Turned | Ra 1.6 μm - 3.2 μm. |
| Ground | Ra 0.4 μm - 0.8 μm. | |
| Electropolished | Ra ≤ 0.4 μm (smooth, bright, enhanced corrosion resistance). | |
| Secondary Features | Machined Ends | Chamfered, squared, center-drilled, drilled & tapped, or with special drive features (hex, slot). |
| Corrosion Resistance | Standard Treatment | Passivation per ASTM A967 (Nitric or Citric Acid method). |
| Certification & Traceability | Material Certification | Mill Test Certificate (MTC) provided confirming composition and properties. |
| Production Lead Time | Standard Items: 2 - 4 weeks. Custom/Long Length/High Precision: 4 - 8 weeks. |
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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