Explore our high-performance architectural and industrial structural fasteners.
In modern data centers, telecommunications facilities, and heavy electrical manufacturing, structural integrity begins with small, high-stress critical components. Stainless steel cage nuts, also widely referred to as captive nuts, represent the gold standard for mounting hardware into square-punched rack equipment lines. Designed to incorporate the corrosion resistance of stainless steel (SS304, SS316) with the elasticity and self-retaining spring characteristics of dynamic carbon or stainless steel cages, these fasteners eliminate thread-stripping risks and facilitate rapid modular system integrations.
As the infrastructure sector undergoes transition due to hyper-scale cloud data centers, high-frequency telecommunication networks (5G/6G), and decentralized industrial control boxes, the demand for stable mechanical components has spiked. Standard zinc-plated steel cage nuts risk premature thread binding, oxidization, and mechanical failure when exposed to atmospheric humidity or chemical compounds. A high-quality Chinese factory utilizing precision tooling ensures that stainless steel cages retain their dimensional accuracy while delivering high clamping forces and structural reliability.
Send Engineering InquiryEvery batch of our cage nuts complies with rigorous global engineering and structural parameters.
Sinsun Hardware manufactures fasteners utilizing high-grade raw materials directly sourced from XING TAI Steel. By controlling the internal processing stage, including spheroidizing annealing and wire drawing, we govern the exact hardness indices and tensile capabilities before the product is stamped and formed. The stainless steel nuts inside the cages are designed to meet either SUS 304 (A2 grade) or SUS 316 (A4 grade) standards, offering outstanding protection against galvanic corrosion, atmospheric acid rain, and extreme thermal operational environments.
| Material Grade | Tensile Strength (MPa) | Yield Strength (0.2% MPa) | Hardness Range (HRC) | Salt Spray Corrosion Resistance | Key Industrial Applications |
|---|---|---|---|---|---|
| Stainless Steel 304 (A2-70) | 700 - 850 | ≥ 450 | 20 - 28 | 480+ Hours (No red rust) | Standard server racks, indoor telecom enclosures, HVAC, and industrial switches. |
| Stainless Steel 316 (A4-80) | 800 - 1000 | ≥ 600 | 25 - 32 | 1,000+ Hours (ASTM B117) | Offshore equipment racks, chemical processing sites, marine electrical panels, and transit corridors. |
| High-Carbon Cage Springs | 950 - 1100 | ≥ 850 | 40 - 48 | Treated with Dacromet / Geomet | Provides the elastic tension and snap-in spring force for standard square rack holes. |
Our production prowess is driven by German-imported machinery, precision Taiwanese technology, and a dependable staff of trained specialists. We offer over 20,000 SKUs of nails, screws, wires, and rivets, each undergoing 12+ stringent quality checks to assure outstanding polish (Ra ≤ 0.4μm), corrosion resistance (1,000+ hours salt spray), dimensional accuracy (±0.02mm), high strength (1,000+ MPa), and consistent hardness (HRC 28-32).
We specialise in offering unique fastening solutions that are tailored to your specific needs. Our technical team works directly with clients from design to manufacturing, providing support for unusual materials, coatings, dimensions, and performance requirements to ensure that each custom order matches exact specifications.
From Startup to Global Industry Leader: Our milestones since 2006.
Sinsun began with a singular focus in 2006: to build a factory dedicated to self-tapping screws. This foundational specialization established our core expertise from the ground up.
The year 2012 marked a pivotal step for Sinsun with the establishment of our Export Department. From that point forward, our specialized fasteners began reaching global markets.
In 2015, Sinsun expanded its control over quality by adding four spheroidizing furnaces for raw material processing and in-house wire drawing capabilities, ensuring superior consistency.
Our production capability was enhanced in 2018 with new German multi-station cold heading machines and an expanded product line, including diverse drill tail screws.
Sinsun's growth in 2021 was defined by reaching 36,000 tons in annual production, demonstrating our capacity to deliver large-scale orders globally.
To ensure timely delivery, we operated a dedicated ready-stock warehouse, supporting daily distribution and client retail replenishment cycles.
The addition of four heat treatment lines in 2025 significantly boosts our production capacity, providing greater product durability and stronger delivery guarantees.
Where Sinsun Stainless Steel Cage Nuts and specialized fasteners deliver mechanical stability.
M5, M6, and 10-32 cage nuts fit into standard square holes on server cabinets, allowing for rapid slide assembly of server units, switches, routers, and power distribution systems without threat of stripping structural threads.
For smart factories, electrical enclosures and heavy switchgears are engineered to function under vibration. Dynamic locking properties of SS304 cage nuts ensure system control boxes remain secure under prolonged vibration.
Used heavily in internal dashboard brackets, railway infrastructure control hubs, and aerospace power cells. The corrosion resistance of high-tensile stainless steel guarantees reliable performance in harsh environments.
Sinsun Hardware, established in 2006, is a leading manufacturer and global supplier of high-quality fasteners. As Northern China's largest producer of Self-Tapping Screws, we operate from a gigantic 30,000 sqm integrated facility that includes modern production zones, a 12,000 sqm smart warehouse (18,000+ pallet capacity), and multi-language customer support centres. Our yearly supply of over 8,500 containers consistently services key global markets such as the Middle East, Southeast Asia, South America, and Russia.
Our localized supply chain advantage starts with direct sourcing of premier domestic raw steel, followed by in-house processing. With 4 advanced heat treatment lines added in 2025 and state-of-the-art German cold heading machines in our facility, we are uniquely equipped to balance manufacturing speed with exceptional precision.
Moreover, our engineering team works directly with clients on OEM/ODM packaging, 3D design previews, and logistics support, offering a seamless experience from production to container shipment.
Direct answers from our senior engineering team to help you optimize your procurement process.
We welcome clients from across the globe for on-site quality inspection audits.
Explore our complete industrial portfolio of screws, nuts, washers, and specialized bolts.
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