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Custom 1/4-20 UNC Copper Screw with High Corrosion Resistance and Customized Length CNC Machined Bolt
| Place of Origin | GuangDong Dongguan |
| Brand Name | SITUO |
| Certification | ISO9001 & TS16949 |
| Model Number | ST-300047 |
1/4-20 UNC Thread Copper Screw
,High Corrosion Resistance Brass Fastener
,Customized Length CNC Machined Bolt
Situo Hardware specializes in custom 1/4‑20 UNC red copper screws, US‑thread conductive copper bolts, and high‑thermal‑conductivity copper machine screws. Our hardware serves electrical power equipment, new‑energy modules, earthing assemblies, heat dissipation modules, instruments, and communication cabinet assembly.
This series of 1/4‑20 red copper screws are manufactured from high‑purity T2 red copper using a composite process: cold heading forming followed by CNC precision machining. This approach preserves continuous metal grain flow for improved tensile and anti‑fatigue performance while achieving tight tolerances for 1/4‑20 UNC thread, head dimension, and other critical features.
≥99.9% Cu content delivers outstanding electrical and thermal conductivity with low contact resistance. Tin‑plating or nickel‑plating options reduce oxidation and stabilize electrical performance.
Cold heading forms main body with uninterrupted metal grain flow, followed by CNC precision machining to achieve strict tolerances. This hybrid method provides superior strength and material utilization.
Thread rolling with full‑profile teeth and 100% go/no‑go gauge inspection ensures smooth engagement and anti‑stripping performance. Full‑thread and half‑thread versions available.
Available head types include pan head, socket cap head, countersunk head, hex head, and more. Adjustable shank length, smooth‑shaft length, and effective thread length.
Natural copper passivation, tin‑plating, nickel‑plating, and polishing options to reduce contact resistance, retard tarnishing, and improve solderability.
Comprehensive inspection including raw‑material verification, dimension inspection, thread gauge testing, and surface quality checks to ensure batch‑to‑batch consistency.
- 1/4‑20 red copper fasteners for conductive connection in electrical equipment and earthing assemblies
- Thermally compressive red copper screws for new‑energy and heat‑dissipation modules
- Conductive earthing fasteners for communication cabinets and instruments
- US‑thread red copper machine screws for power terminals and copper‑bar transition joints
- Automation components requiring combined electrical conduction, heat dissipation and assembly precision
- Replacement & retrofit conductive thermal fasteners for devices with 1/4‑20 UNC ports
We utilize advanced equipment from Japan and Germany including CNC 5-axis and 6-axis machines. Maximum processing outer diameter: 60mm. Minimum control tolerance: 0.001mm.
Japanese CNC Tsugami, CNC Citizen, multi-station cold extrusion forming machines, 500T press machines, casting equipment, and various process equipment.
300 employees including 20 technicians, 10 engineers, and 15 quality control personnel with over 300 pieces of equipment.
8S management, ISO9001 and TS16949 automotive certifications. Notable customers include Foxconn, Husqvarna, Shimano, NVIDIA, DJI Drones,
| Service | CNC Machining, Turning and Milling, CNC Turning, Cold heading, Stamping, Assembly Service |
|---|---|
| Materials | Aluminum, Stainless Steel, Steel, Alloy Steel, Titanium, Brass, Copper, Bronze, Magnesium Alloy, Engineering Plastics |
| Finishes | Sandblasting, Anodize color, Blackening, Zinc/Nickel Plating, Polish, Powder coating, Passivation PVD, and more |
| Drawing Formats | STEP, STP, GIS, CAD, PDF, DWG, DXF etc or samples |
| Tolerance | +/-0.01mm ~ +/-0.05mm |
| Surface Roughness | Ra 0.1~3.2 |
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