Cold Drawn Precision Round Aluminum Bar with h8 Tolerance and 6061-T6 Alloy for

The cold drawn precision round aluminum bar in 6061-T6 temper represents the highest quality bar stock available for high-speed automated machining operations, particularly Swiss-type CNC lathes, automatic screw machines, and multi-spindle turning centers.

The cold drawing process involves pulling hot-extruded aluminum bar stock through precision dies and straightening rollers at room temperature, simultaneously reducing diameter to exact specifications, improving surface finish, enhancing mechanical strength through strain hardening, and producing exceptional straightness.

Featuring h8 tolerance per ISO 286, this precision eliminates the need for preliminary skin cutting or centerless grinding, allowing direct loading into bar feeders and guide bushings of Swiss-type CNC lathes without additional preparation.

• h8 Precision Tolerance: Diameter controlled within ISO 286 h8 tolerance band ensures consistent bar diameter along entire length, enabling direct loading into Swiss-type lathe guide bushings with optimal clearance control and zero bar vibration during high-speed rotation up to 10,000 RPM.
• Cold Drawn Surface Finish: The cold drawing process produces a bright, smooth surface with Ra ≤ 1.6μm as standard, significantly reducing friction in automatic bar feeder channels, lathe guide bushings, and collet clamping systems.
• Enhanced Mechanical Properties: Cold working during drawing increases tensile strength by approximately 5-10% above standard T6 extruded values, providing added margin in structural turned components.
• Superior Straightness: Maximum deviation of 0.5mm per meter length ensures reliable bar feeding through automatic magazine loaders and eliminates whip and vibration issues.
• Eliminates Preparation Operations: Precision diameter and surface finish remove the need for preliminary peeling, centerless grinding, or skim cutting operations.
• Consistent Chip Formation: Cold drawn microstructure produces predictable, short-breaking chips in 6061-T6 material, reducing bird-nesting problems around tooling.

Cold drawn 6061-T6 precision round aluminum bars are the standard bar stock for Swiss-type CNC lathe operations across the precision turned parts industry:

• Hydraulic & Pneumatic Components: Fluid connectors, banjo bolts, hose fittings, valve bodies, and adapters for systems operating up to 350 bar
• Automotive Sensors: Sensor housings, threaded inserts, bushings, and mounting adapters for reliable engine and chassis installation
• Electronics Industry: Connector shells, standoffs, spacers, terminal bodies, and heat sink studs requiring dimensional accuracy
• Medical Devices: Surgical instrument handles, endoscopic device bodies, and orthopedic implant instrumentation meeting FDA and ISO 13485 requirements
• Fastener Production: Custom aluminum screws, nuts, and threaded inserts with consistent thread quality for production runs exceeding 100,000 pieces
• Precision Components: Shafts, axles, and spindles for office automation equipment, laboratory instruments, and optical positioning systems

Cold drawn precision round aluminum bars receive protective coating of non-staining anti-rust oil immediately after final straightening and inspection, followed by individual wrapping in VCI (Volatile Corrosion Inhibitor) paper providing up to 24 months of corrosion protection.

Bars are bundled in standard 3000mm lengths with protective end caps, packed in ISPM 15 certified fumigation-free plywood cases with internal separators. Each shipment includes EN 10204 3.1 inspection certificate documenting chemical composition, tensile test results, hardness measurements, dimensional inspection reports, and surface roughness measurements.

Availability: Standard diameters from 5mm to 50mm in 3000mm length ship within 5 working days. Non-standard diameters, alternative tolerance grades (h7, h9), special lengths, and specific packaging accommodated within 15-25 working days.