Located in the Bohai Economic Rim with convenient access to the Beijing-Shanghai Expressway, Nanpi Haokai Hardware Products Co., Ltd. has established itself as a leading manufacturer of custom metal components over the past two decades. Specializing in stainless steel spring production and precision metal fabrication, our ISO 9001:2015 certified factory combines advanced equipment with technical expertise to deliver high-quality industrial hardware solutions worldwide.
Comprehensive Manufacturing Capabilities
Our 3,000㎡ production facility houses over 60 pieces of advanced equipment including 30+ stamping presses ranging from 30-250 tons, 30+ CNC machining centers (including automatic lathes and Swiss-type CNC machines), and specialized injection molding machines. This comprehensive equipment park enables us to handle projects from simple stamping parts to complex CNC machined components with tight tolerances.
The technical team comprising 16 engineers and 7 senior technicians brings over 120 years of combined industry experience. Their expertise covers material selection, process optimization, and quality control throughout the production lifecycle. This technical strength allows us to implement DFM (Design for Manufacturing) principles early in product development, helping clients reduce costs and improve production efficiency.
Our quality management system strictly follows ISO 9001:2015 standards, with comprehensive inspection procedures at each production stage. From raw material verification to final product testing, we maintain complete traceability records to ensure consistent quality. This systematic approach has earned us long-term partnerships with Fortune 500 companies across multiple industries.
Core Product Portfolio
As a comprehensive metal component manufacturer, we specialize in three main product categories:
1. Precision Stamping Components
Our stainless steel spring production utilizes high-speed progressive dies to achieve consistent force characteristics and fatigue resistance. The metal shovel series, featuring one-piece stamped construction with reinforced ribs, demonstrates our capability in complex stamping geometries. These shovels eliminate welding points through strategic material flow control, achieving 30% higher strength compared to assembled alternatives.
For connector applications, our brass terminal shells employ deep drawing technology to create seamless housings with precise dimensional control. The one-piece design ensures reliable electrical contact while withstanding mechanical stress during assembly. Customization options include material substitution (phosphor bronze, aluminum alloy), dimensional adjustments, and premium surface treatments like gold plating for high-corrosion environments.
2. CNC Machined Components
The brass connecting rod series showcases our precision CNC turning capabilities. Manufactured from high-conductivity C3604 brass, these components feature ±0.02mm dimensional accuracy and Ra0.8 surface finish straight from the machine. The one-piece construction eliminates assembly errors while the optimized geometry ensures smooth insertion/withdrawal cycles in connector applications.
Our knurled zinc-plated bushings demonstrate advanced turning techniques combined with secondary processes. The diamond knurling pattern increases friction by 40% compared to smooth surfaces, preventing loosening in vibrating equipment. The zinc plating provides 500+ hours of salt spray resistance, making these bushings ideal for outdoor machinery applications.
3. Injection Molded Parts
While specializing in metal components, our injection molding department complements our product range with engineering plastic solutions. Using PA66, POM, and other high-performance polymers, we produce components requiring complex geometries or electrical insulation properties. The integration of metal inserts during molding creates hybrid parts that combine plastic’s design flexibility with metal’s structural integrity.
| Product Category | Material Options | Typical Tolerances | MOQ |
|---|---|---|---|
| Stamping Parts | Stainless steel, cold rolled steel, brass, aluminum | ±0.05mm | 5,000 pcs |
| CNC Components | Brass, steel, stainless steel, aluminum | ±0.02mm | 1,000 pcs |
| Injection Parts | PA66, POM, ABS, PC+ABS | ±0.1mm | 3,000 pcs |
Customization Process & Quality Assurance
Our customization workflow begins with detailed requirements analysis where our engineering team collaborates with clients to optimize designs for manufacturability. For new projects, we provide free DFM reports identifying potential production issues and suggesting cost-saving modifications. Prototype samples are typically delivered within 7-15 days depending on complexity, with full production commencing after client approval.
Quality control measures include:
- Incoming material inspection with spectral analysis
- In-process inspection using CMM and optical comparators
- 100% functional testing for critical dimensions
- Salt spray testing for corrosion-resistant finishes
- Fatigue testing for spring components
Our production flexibility supports both small-batch prototyping (as low as 100 pcs) and high-volume manufacturing (up to 2 million pcs/month). Lead times range from 15 days for simple stamping parts to 30 days for complex CNC assemblies, with expedited services available for urgent orders.
Industry Applications & Success Stories
Our components serve diverse industries including:
- Automotive: Custom springs for seat adjustment mechanisms, CNC brackets for engine components
- New Energy: Terminal housings for EV charging connectors, bushings for solar tracking systems
- Medical: Precision shims for diagnostic equipment, corrosion-resistant components for sterilization devices
- Electronics: EMI shielding frames, heat sink mounting brackets, connector terminals
A recent project for a European automotive supplier involved developing a stainless steel spring assembly with 0.3N/mm force rate tolerance. Through iterative prototyping and material optimization, we reduced the part weight by 25% while maintaining required fatigue life, resulting in annual cost savings of €120,000 for the client.
FAQ
What materials do you commonly use for custom spring manufacturing?
Our spring production primarily uses 304/316 stainless steel for corrosion resistance, with options for music wire (SWC), oil-tempered wire, and phosphor bronze for specific applications. For high-temperature environments, we offer Inconel and other nickel-based alloys. All materials come with full material certificates traceable to the mill.
How do you ensure dimensional consistency in CNC machined components?
We implement multiple quality control layers: (1) Pre-production CMM programming verification, (2) In-process inspection every 50-100 pcs using digital calipers, (3) Final inspection with 0.001mm resolution CMM, and (4) Statistical process control (SPC) charts for critical dimensions. For long-run orders, we perform periodic tooling inspections to prevent dimensional drift.
What is your minimum order quantity for custom stamping parts?
Our MOQ starts at 5,000 pcs for standard stamping parts using existing tooling. For new tooling projects, the MOQ typically ranges from 10,000-20,000 pcs depending on part complexity and material type. We offer progressive die stamping for high-volume orders and transfer press stamping for medium volumes with complex geometries.
Can you provide surface treatment services for metal components?
Yes, we offer comprehensive surface treatment options including: (1) Electroplating: zinc, nickel, chrome, tin, and precious metal plating, (2) Anodizing: clear, black, and colored finishes for aluminum parts, (3) Powder coating: for corrosion protection and aesthetic finishes, (4) Passivation: for stainless steel to improve corrosion resistance, (5) Electropolishing: for ultra-smooth surfaces in medical applications.
How do you handle design changes during production?
For minor design modifications that don’t require tooling changes, we can implement them immediately after engineering verification. For modifications affecting tooling, we assess the impact and provide options: (1) Tooling modification if cost-effective, (2) New tooling production if the change is significant, (3) Hybrid approach combining existing and new tooling. We maintain detailed tooling records to facilitate efficient modifications.
Summary
Nanpi Haokai Hardware stands as a comprehensive solution provider for custom metal components, combining two decades of manufacturing expertise with state-of-the-art equipment. Our ISO 9001:2015 certified processes ensure consistent quality across stainless steel spring production, precision CNC machining, and injection molding services. With a technical team capable of handling projects from initial design to final delivery, we offer global clients a reliable partner for their industrial hardware needs. Whether requiring standard components or fully customized solutions, our production flexibility and quality commitment make us the preferred choice for companies seeking to optimize their supply chains in the Bohai Economic Rim.