Xiamen Goldcattle, with 26 years in precision fastener manufacturing, specializes in custom CNC threaded rod fittings—covering fully threaded rods, partially threaded studs, double-ended studs, and threaded connectors (steel/stainless/aluminum materials). Crafted via advanced CNC threading and grinding, we deliver ±0.005mm tolerance parts, backed by ISO 9001 and DIN 975. From prototypes to 100,000+ units/month, our rods ensure high tensile strength, precise thread engagement, and corrosion resistance for 70+ global clients in construction, machinery, and aerospace sectors.
Core Processing Technologies: Engineering for High Tensile Performance
CNC threaded rods demand uniform thread geometry and surface finish to withstand axial loads (up to 500kN) and vibration. Goldcattle’s technologies ensure reliable clamping force and extended service life in critical fastening applications.
1. Precision Thread Forming
- CNC thread turning: Produces metric, UNC, UNF, and custom threads with ±0.003mm pitch tolerance and 6g/6H fit class. A 16mm metric threaded rod for industrial machinery achieved 100% thread engagement, maintaining 300kN clamping force without slippage.
- Roll threading: Strengthens threads by cold working, increasing tensile strength by 25% vs. cut threads. A ½-inch stainless steel fully threaded rod for construction withstood 150kN tensile load (20% higher than industry standards) without thread stripping.
- Thread grinding: Creates high-precision threads (class 4g/4H) on critical rods (e.g., aerospace studs) with Ra 0.02μm surface finish, ensuring consistent torque-tension relationship. A 10mm titanium stud achieved ±0.002mm thread runout, critical for uniform load distribution.
2. Surface Treatment & Corrosion Resistance
- Zinc plating with passivation: Applied to carbon steel rods, providing 500+ hours salt spray resistance and a smooth thread surface (Ra 0.2μm) that reduces galling during nut tightening.
- Hot-dip galvanizing: For outdoor construction rods, 85-100μm zinc coating ensures 1,000+ hours salt spray resistance, suitable for bridges and marine structures.
- Electroless nickel plating: For high-precision rods (e.g., semiconductor equipment studs), offers 1,500+ hours corrosion resistance and uniform coating thickness (±2μm) on threads, meeting FDA standards for cleanroom applications.
3. Straightness & Dimensional Control
- CNC centerless grinding: Achieves rod straightness (≤0.05mm/m) and diameter tolerance (±0.005mm), ensuring even load distribution across threads. A 1m-long 20mm threaded rod for construction maintained 0.03mm/m straightness, preventing bending under 200kN axial load.
- Tension straightening: Eliminates residual stresses in long rods (≥2m), ensuring dimensional stability (≤0.02mm/m) after installation. A 3m carbon steel threaded rod for heavy machinery remained straight after 10,000+ vibration cycles (10-500Hz).
4. Quality Testing & Load Validation
- Tensile testing: 100% of rods undergo tensile strength tests (≥800MPa for 8.8-grade steel) and yield strength verification (≥640MPa), meeting ISO 898-1 standards.
- Thread gaging: Uses master thread rings/plugs (calibrated to ISO 1502) to check thread size, pitch, and flank angle, ensuring 6g/6H fit class compliance.
- Vibration testing: Rods undergo 1 million+ cycles at 10-500Hz with 50% rated load, verifying no thread loosening or fatigue failure—critical for machinery and aerospace applications.
Material Expertise: Matching Metals to Rod Applications
CNC threaded rods balance tensile strength, corrosion resistance, and cost—Goldcattle selects materials based on load and environment:
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Material
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Key Properties
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Application
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Advantages
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High-Strength Steel (8.8/10.9 Grade)
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Tensile strength 800-1,000MPa, cost-effective
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Construction, heavy machinery
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Withstands 200-500kN axial loads; ideal for high-torque fastening.
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Stainless Steel (304, 316)
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Corrosion resistance, 515MPa tensile strength
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Food processing, marine, medical equipment
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304: 500+ hours salt spray; 316: 1,000+ hours (resists chloride solutions).
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Aluminum Alloy (6061-T6)
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Lightweight, 310MPa tensile strength
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Aerospace, automotive, HVAC
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30% lighter than steel; suitable for low-load (≤50kN) applications.
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Titanium Alloy (Ti-6Al-4V)
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High strength-to-weight ratio, 895MPa tensile strength
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Aerospace, high-performance machinery
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45% lighter than steel; maintains strength at 300℃.
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CNC Threaded Rod Machining Technologies
- Multi-spindle thread rolling machines: Produce small-diameter rods (M6-M16) at 200+ units/min with consistent thread quality (±0.003mm pitch), achieving 100,000+ units/day.
- CNC thread grinding centers: Create precision threads (class 4g/4H) on high-load studs, ensuring Ra 0.02μm surface finish for aerospace fastening systems.
- Automated length cutting lines: Cut rods to ±0.1mm length tolerance (50-3,000mm) with deburred ends, reducing assembly time by 30% for clients.
Custom CNC Threaded Rod Manufacturing Process
- Design & DFM: Engineers analyze client drawings (STEP/IGS) to optimize thread length and root radius—e.g., adding 1mm radius to thread roots of a construction stud to increase fatigue resistance by 25%.
- Material selection: Choose 10.9-grade steel for high load, 316 stainless for corrosion, or titanium for aerospace based on client specs.
- CNC machining: Centerless grinding creates precise OD; threading (rolling/turning/grinding) forms uniform threads; cutting to length with deburring.
- Surface treatment: Plating, galvanizing, or passivation applied per corrosion requirements—e.g., hot-dip galvanizing for outdoor construction rods.
- Quality validation: Tensile testing, thread gaging, and straightness checks ensure compliance with DIN 975 and client load standards.
Custom CNC Threaded Rod Application Fields
- Construction industry: High-strength steel threaded rods (M20-M36) for structural bracing, withstanding 500kN axial loads in building foundations.
- Machinery manufacturing: 10.9-grade partially threaded studs for gearbox assembly, ensuring precise bearing preload (±0.05mm) and vibration resistance.
- Aerospace engineering: Titanium double-ended studs for aircraft engine mounting, lightweight (45% vs. steel) and rated to 300℃ operating temperature.
- Food processing: 316 stainless steel threaded rods with electropolished threads, meeting FDA 21 CFR 177.2600 for cleanroom equipment fastening.
- Renewable energy: Hot-dip galvanized rods (M16-M24) for wind turbine tower assembly, resisting 1,000+ hours salt spray in coastal installations.
Customization Capabilities: From Prototype to Production
Threaded rods require customization to match unique load and length requirements—Goldcattle supports clients with flexible solutions:
- Thread customization: Produce metric (M3-M50), UNC (¼-2), UNF, and custom threads (e.g., 12 TPI for legacy machinery) with 6g/6H to 4g/4H fit classes.
- Length flexibility: 50mm-6m rods, including partially threaded designs (e.g., 1m rod with 300mm threads on both ends) for precise component spacing.
- Production scale: 10-500 prototypes (2-3 days) via CNC machining; 10,000-100,000+ units/month with multi-spindle automation (e.g., 50,000 M12 stainless rods for medical equipment).
Common Processing Questions
- Q: How to prevent thread stripping in high-torque applications (e.g., industrial presses)?
A: Use roll-threaded 10.9-grade steel rods (25% stronger threads) with increased root diameter (0.5mm over standard), tested to 150% of rated torque (e.g., 600Nm for M20 rods) without failure.
- Q: What’s the lead time for 5,000 custom 20mm metric threaded rods (1.5m length)?
A: 3 days for tooling setup, 7 days for production—total 10 days. Rush options cut lead time by 40% with expedited rolling.
- Q: Can rods withstand -50℃ low temperatures (e.g., Arctic construction)?
A: Yes—using 8.8-grade steel with nickel alloying (≥3%), rods maintain 90% tensile strength at -50℃, meeting ISO 898-1 cold-temperature standards.
- Q: How to ensure uniform thread engagement across long rods (e.g., 6m construction rods)?
A: Centerless grinding ensures ±0.005mm diameter tolerance across the rod length, while thread rolling maintains consistent pitch (±0.003mm), verified via 3D thread scanning.
Why Choose Goldcattle?
- Thread expertise: 26 years in precision threading, with 300+ rod designs meeting DIN, ISO, and ASTM standards for tensile strength and thread quality.
- Quality assurance: 100% tensile testing, thread gaging, and material certification (3.1B); full traceability from raw material to delivery.
- Cost efficiency: Multi-spindle rolling reduces production costs by 25% for high-volume orders; design optimization (e.g., integrated thread stops) cuts assembly time.
- Global compliance: Rods meet REACH, RoHS, and NORSOK M-630 (oil & gas), suitable for global projects (EU, US, Middle East).
Start Your Project Today
Need custom CNC threaded rods? Upload your drawings or specs via our online form to receive a feasibility report and quote within 24 hours. Our engineers will optimize thread design for your load and environment requirements.
“Goldcattle’s 10.9-grade threaded rods solved our machinery vibration issues—uniform threads ensured consistent clamping force, reducing downtime by 80% in our production line.” — Machinery Manufacturer Client
