Product Description

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 a considerable distance. Its CNC-machined construction ensures consistent thread quality, dimensional accuracy, and surface finish along its entire length, making it superior to standard rolled or cut threaded rods for critical assemblies.

Product Processing

1. Material Preparation: Sourcing and cutting of certified 304 stainless steel round bar to required blank length, often including stress-relieving for long rods to minimize machining distortion.

2. CNC Turning (Primary): Machining the entire rod on a precision CNC lathe to achieve the target outer diameter, ensuring consistency and straightness over the long length. Use of steady rests and follow rests is critical.

3. Thread Milling (Preferred Method): Using a thread milling cutter on a CNC mill or lathe with live tooling to cut the threads. This method offers superior accuracy, surface finish, and the ability to create custom thread forms compared to traditional die cutting.

4. Secondary Milling Operations: Adding flats, grooves, keyways, cross-holes, or other non-cylindrical features along the shaft using CNC milling.

5. Heat Treatment (Optional): Solution annealing to relieve machining stresses, especially for very long or precision-ground rods.

6. Straightening & Precision Grinding (High-End): For applications requiring exceptional straightness or diameter tolerance, the rod may undergo centerless grinding.

7. Surface Finishing: Passivation (per ASTM A967) is standard. Electropolishing can be applied for a smooth, clean, corrosion-resistant finish.

8. Inspection & Measurement: Comprehensive inspection including length, diameter, thread pitch/diameter verification (with thread gauges or optical comparators), and straightness measurement.

Product Applications

• Precision Machinery & Automation: 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, analyzers, and surgical tables.

• Food & Beverage Processing: Conveyor system components, mixer shafts, and adjustment mechanisms where corrosion resistance and cleanability are crucial.

• Marine & Chemical Equipment: Valve stems, pump shafts, and tie rods in corrosive environments.

• Optical & Photonic Mounting: Precision posts and adjustment rods for lens, mirror, and laser mounting.

• Architectural & Display Systems: Structural tension rods, curtain rail supports, and display mount components.

Technical Parameters