Explore Sinsun Hardware's high-capacity manufacturing catalog and international distribution items.
In modern industrial assembly, the vulnerability of exposed threaded fasteners poses serious operational challenges. Corrosive moisture ingress, chemical abrasion, and mechanical impacts damage structural joints, leading to high maintenance costs and system downtime. Sinsun Hardware addresses these engineering bottlenecks with our premium line of brass acorn nuts (cap nuts).
Leveraging specialized cold heading systems from Germany and Taiwan, Sinsun delivers high-precision dome formatting and flawless thread patterns. Our brass acorn nuts cover a wide range of functions. They protect exposed bolt threads from harsh environments, prevent injuries from sharp edges, and provide an aesthetic finish for architectural installations.
Our brass cap nuts are engineered to solve fastening and protection challenges across diverse heavy industrial sectors.
With its natural electrical conductivity and non-magnetic properties, brass is ideal for electrical switchgear, distribution blocks, and battery terminal connections. Sinsun acorn nuts shield sensitive terminals from galvanic corrosion while preventing arcing and localized discharge.
Saltwater accelerates decay in standard steel fasteners. Our marine-grade brass acorn nuts withstand marine spray, preventing moisture from pooling inside structural threads. This design reduces long-term maintenance costs for coastal structures, ports, and onboard instrumentation.
For sanitary installations, hot water distribution lines, and luxury building designs, brass blends visual appeal with reliable function. Our acorn nuts protect connections in high-temperature environments, resisting dezincification and rust.
At SINSUN, our quality control begins at the source. By managing the entire production process under one roof, we guarantee unmatched product consistency.
We source premium copper and brass billets from top metal suppliers. In-house testing ensures optimal material microstructures for clean cold heading.
Utilizing high-speed cold heading and thread-rolling machinery, we maintain tight tolerances of ±0.02mm and structural integrity across every thread.
We run four dedicated heat treatment lines to optimize the tensile strength and hardness of our alloy fasteners, ensuring consistent mechanical performance.
Our 12,000 m² warehouse features automated optical sorters. This setup handles custom packaging, 3D design previews, and high-volume container loading.
A history of expanding capacity, integrating technology, and meeting global fastener demands.
Sinsun Hardware is established, focusing on building high-precision manufacturing systems for Northern China.
We launch global operations, earning ISO 9001 certification and exporting premium fasteners to the Middle East and Russia.
We upgrade our machinery to German multi-station headers, improving production speeds and lowering tolerance margins to ±0.02mm.
Our smart facility reaches an annual output of 36,000 tons. Expanded heat treatment and plating lines ensure short lead times for high-volume orders.
Comprehensive sizing and material specifications for Sinsun's heavy-duty brass acorn nuts.
| Nominal Size (Metric / Imperial) | Thread Pitch (coarse/fine) | Overall Hex Width (W - mm) | Total Height (H - mm) | Dome Radius (R - mm) | Minimum Thread Depth (D - mm) |
|---|---|---|---|---|---|
| M3 / #4-40 | 0.50 mm / 40 TPI | 5.50 | 6.00 | 2.75 | 4.50 |
| M4 / #6-32 | 0.70 mm / 32 TPI | 7.00 | 8.00 | 3.50 | 5.50 |
| M5 / #8-32 | 0.80 mm / 32 TPI | 8.00 | 10.00 | 4.00 | 7.50 |
| M6 / #10-24 | 1.00 mm / 24 TPI | 10.00 | 12.00 | 5.00 | 8.00 |
| M8 / 5/16"-18 | 1.25 mm / 18 TPI | 13.00 | 15.00 | 6.50 | 11.00 |
| M10 / 3/8"-16 | 1.50 mm / 16 TPI | 17.00 | 18.00 | 8.50 | 13.00 |
| M12 / 1/2"-13 | 1.75 mm / 13 TPI | 19.00 | 22.00 | 9.50 | 16.00 |
| M16 / 5/8"-11 | 2.00 mm / 11 TPI | 24.00 | 28.00 | 12.00 | 21.00 |
See how Sinsun Hardware's custom fasteners and technical support solve challenges in real-world applications.
Challenge: A tier-1 automotive supplier needed a custom flange dome cap nut with high vibration resistance and weight savings for an electric vehicle battery pack.
Sinsun Solution: We developed a customized C36000 brass alloy formulation combined with a specialized thread-locking design. Our team managed full testing protocols to meet automotive standards.
Result: Realized a 15% weight reduction. The assembly passed a 2,000-hour vibration test, integrating smoothly into the client's automated assembly line.
Challenge: A marine engineering client required large-diameter brass cap nuts to protect exposed steel bolts in a harsh, corrosive offshore saltwater environment.
Sinsun Solution: We recommended high-grade duplex brass alloy nuts finished with a specialized passivation coating, backed by full batch traceability and material certification.
Result: Zero fastener failures reported. The solution exceeded the client's lifecycle durability targets by preventing early thread failure.
We ensure zero-defect performance by inspecting every manufacturing batch to guarantee structural integrity.
Using our ERP-driven management system, we track every batch from the raw copper wire drawing stage to final plating, providing transparent material testing reports.
Automated optical sorting machines verify key dimensions, pitch depth, and dome shape, maintaining a tight dimensional tolerance of ±0.02mm.
Our laboratory conducts mechanical tests, including torque tension, hardness (HRC 28-32), and salt spray exposure (1,000+ hours) to ensure durability.
Industrial trends are moving toward lead-free compliance and smart structural health monitoring. Sinsun's R&D team is developing advanced fastener options to meet these upcoming needs:
Technical answers to common engineering, material selection, and procurement questions.
We offer flexibility. While our production setup is optimized for high-volume orders, we also support smaller pilot runs and custom prototype developments. Reach out to our engineering team with your drawings and specifications.
Yes. We manufacture to all global standards, including DIN 1587 (high dome cap nuts), DIN 917 (low dome), and ASME B18.2.2. Our precision tooling ensures correct hex dimensions and thread pitch parameters across all batches.
Quality is built into every step. We use Statistical Process Control (SPC), inspect raw materials, run in-process optical sorting checks, and perform final audits for key dimensions. We share complete measurement and testing reports with our customers.
Delivery timelines depend on part complexity, total order quantity, and finishing treatments. Standard fasteners can ship in 4-6 weeks. We commit to a firm delivery schedule with every proposal.
Yes. We supply pre-production samples for technical testing and approval. This sample stage is standard for our custom manufacturing orders.
Explore our main product capabilities, manufactured using German cold heading and Taiwanese engineering technology.
Designed for clean penetration and strong joints in heavy metal applications.
High-grade wire products built for packaging, assembly, and manufacturing.
Northern China's largest production line, delivering consistent thread quality.
High-shear fastening solutions for structural and sheet-metal systems.
Deep-thread anchor screws designed for reliable, plug-free masonry connections.
Expansion sleeves and structural anchors built for load-bearing installations.
Hardened steel nails engineered to drive directly into concrete slabs.
Threaded industrial fasteners built for heavy load applications.
A structured workflow designed to ensure clear communication and reliable execution for global supply chains.
We analyze your application requirements, material choices, and load limits to find the best design path.
Our engineers provide detailed design recommendations, 3D CAD previews, and clear cost proposals within 48 hours.
We manufacture and deliver physical prototypes for your team to test and approve before mass production.
We run scheduled dimensional and hardness checks during mass production to maintain quality standards.
Every batch undergoes final inspection and is packed with full compliance certificates and documentation.
Our team handles logistics documentation and shipping, delivering standard containers or custom orders directly to your door.
A range of high-capacity wire, nail, and screw products from Sinsun Hardware's global manufacturing center.
Sinsun Hardware brings decades of metallurgical expertise and precision engineering to global industries. Share your design files or product specifications, and our team will prepare a solution-focused quote within 48 hours.
Request a Quick QuoteOperational Facility: 30,000 sqm integrated production base in Northern China.
Warehouse Capacity: 12,000 sqm smart storage center housing over 18,000 pallets.
Global Logistics: Supplying over 8,500 shipping containers to global hubs annually.
Customer Support: Multi-lingual service centers handling design support, ordering, and logistics.
SINSUN
