Explore Sinsun Hardware's diverse range of heavy-duty industrial fasteners, nails, and screws manufactured with state-of-the-art cold-heading machines and stringent quality checks.
A Nylon Insert Lock Nut (commonly referred to as a "Nyloc Nut") is an innovative prevailing-torque locknut designed to resist loosening caused by intense vibration, dynamic load cycles, and thermal fluctuation. Unlike traditional locking mechanisms—such as split washers or serrated teeth that damage contact surfaces—the locking action of a Nyloc Nut is achieved by integrating a tough, resilient nylon ring (collar) within an internal pocket at the top of the nut.
When a mating bolt thread engages the nut, it advances normally through the metal threads until it reaches the non-threaded nylon insert. Because the inside diameter of the nylon collar is smaller than the major diameter of the bolt thread, the bolt forces its way through, creating a tight interference fit. Rather than cutting into the nylon, the mating threads displace the material elastically. This elastic deformation zones the nylon, exerting a continuous radial compressive force against the bolt. The friction generated by this radial squeeze creates a "prevailing torque"—an enduring resistive torque that prevents the nut from turning freely even under severe mechanical stress.
The elastic nature of the premium nylon insert absorbs mechanical vibrations, preventing thread friction decay and eliminating the risk of structural loosening in high-frequency applications.
Metal-on-metal locking fastners often cause galling or thread seizing. Nylon inserts secure the assembly smoothly, preserving the integrity of stainless steel and zinc-plated mating bolts.
Sinsun's Nyloc nuts maintain consistent prevailing torque over multiple disassembly cycles, compliant with ISO 2320 and DIN 985 specifications.
As modern engineering demands lighter assemblies, faster cycle times, and structural safety guarantees, standard hex nuts are being phased out in critical sectors in favor of locknuts. The global market for prevailing torque locknuts is expanding rapidly, driven by industrial automation, renewable energy installations, and automotive engineering.
Automotive and EV Manufacturing: The transition to Electric Vehicles (EVs) has introduced high-frequency vibration profiles from electric drivetrains, which are vastly different from the low-frequency vibrations of internal combustion engines. This requires specialized locking systems to safeguard motor brackets, battery mounts, and steering columns without adding excessive weight.
Solar Trackers and Renewable Projects: Utility-scale photovoltaic (PV) systems operate in harsh outdoor environments, facing dynamic wind loads that cause standard fasteners to back out over time. Global solar engineering procurement managers now specify DIN 985 and ISO 7040 Nyloc nuts with hot-dip galvanized or zinc-nickel coatings to ensure maintenance-free operations for 25+ years.
Industrial Machinery and Robotics: With manufacturing plants shifting towards high-speed automation, the robotic arms, conveyor tracks, and pneumatic assemblies rely on self-locking nuts to maintain structural configuration through millions of cycles, minimizing costly line down-time.
Collaborate directly with Sinsun Hardware's metallurgical and design engineering teams to customize thread pitch, coatings, and locking materials.
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 and precision locking solutions, 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 centers. 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 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). Sinsun Hardware is committed to delivering quality, innovation, and on-time performance worldwide.
At Sinsun Hardware, we have embraced the digital transformation of fastener manufacturing to buffer global supply chains against instability. Our Industry 4.0 framework encompasses every stage of manufacturing—from raw material sourcing to smart inventory management.
At SINSUN, our quality control begins at the source. We start with premium raw materials from XING TAI Steel, then perform in-house spheroidizing annealing and precision wire drawing in our own plant. This end-to-end control, supported by our advanced drawing machines and gas-fired furnaces, ensures superior microstructure, consistency, and performance in every fastener we produce.
At SINSUN, we combine German-engineered multi-station cold heading machines with precision Taiwanese production technology. Our specialized processes, including tail-gripping for drill screws and high-precision thread rolling, ensure every fastener is manufactured with utmost accuracy and consistency in our state-of-the-art production facility.
SINSUN operates four dedicated heat treatment lines, allowing for precise and controlled processing time to achieve consistent hardness and enhanced product durability. This in-house capacity ensures both exceptional fastener quality and reliable delivery schedules. See our advanced heat treatment systems in action, supporting our end-to-end manufacturing control.
Furthermore, SINSUN offers flexible OEM and ODM packaging tailored to your needs. With a professional packaging team and a 12,000 m² warehouse, we provide custom packaging, 3D design previews, and full logistics support to deliver a seamless, worry-free experience from production to shipment. Every month, we welcome clients from across the country for on-site factory visits, demonstrating our transparency and production strength. As a trusted industry partner, we actively participate in global exhibitions to connect, exchange insights, and showcase innovation — building lasting relationships based on quality and reliability.
From Sinsun founding in 2006, Sinsun has grown into a leading Chinese fastener manufacturer. Explore our journey of expansion, from establishing exports in 2012 and integrating German technology in 2018, to achieving a 36,000-ton annual output and adding advanced heat treatment lines by 2025.
Sinsun began with a singular focus: to build a factory dedicated to self-tapping screws. This foundational specialization established our core expertise from the ground up. It remains the unwavering commitment behind every screw we manufacture today.
The year 2012 marked a pivotal step for Sinsun with the establishment of our Export Department. From that point forward, our specialized self-tapping screws and fasteners began reaching customers across the world, expanding our mission beyond borders.
Sinsun expanded its control over quality by adding four spheroidizing furnaces for raw material processing and in-house wire drawing capabilities. This strategic upgrade moved our production beyond screw manufacturing, beginning with precise control from the raw material stage. It ensures superior consistency and performance in every piece screw we produce.
Our production capability was enhanced in 2018 with new German multi-station cold heading machines. Concurrently, we grew our product line to include a variety of drill tail screws. This dual development strengthened our specialized manufacturing foundation.
Sinsun's growth in 2021 was defined by two key metrics: reaching 36,000 tons in annual production and fulfilling international orders with over 1,100 export containers. This period underscored our capacity to deliver at scale to a global market.
To ensure timely delivery for our clients, we optimized our storage, bringing ready-stock warehouse facilities online. This smart infrastructure is dedicated to supporting efficient daily distribution and meeting your routine supply needs with zero latency.
The addition of four heat treatment lines in 2025 significantly boosts our production capacity. This directly translates to greater consistency in product quality and stronger guarantees for on-schedule delivery, meeting your project needs with confidence.
Understanding the specific environment where a Nyloc nut is deployed is critical to selecting the correct polymer insert material and metallurgical plating. Sinsun Hardware designs and manufactures custom locknuts suited for diverse and extreme environmental realities.
Marine environments subject structural components to constant salt spray and high-humidity fatigue. Sinsun's Nyloc nuts utilize premium Grade 316 Stainless Steel combined with UV-stabilized nylon collars to resist salt-water ingress and chemical degradation.
Underground and open-pit mining equipment is subject to extreme impact vibration. Sinsun Class 10 carbon steel locknuts, paired with high-temp nylon inserts, withstand these heavy shock impulses without backing out or experiencing fatigue cracking.
In micro-assemblies, dynamic thermal expansions often cause standard fasteners to work loose over time. Sinsun's miniature custom ODM Nyloc nuts (down to M2) provide high prevailing torque without damaging delicate internal circuit layouts.
Explore Sinsun Hardware's specialized range of anchor systems, drywalls screws, and structural fastening supplies designed to sustain maximum mechanical load.
We offer full-service OEM and ODM product design, packaging customization, and complete logistics handling. Reach out to our multi-language sales desk today to request catalog details, custom design blueprints, or an immediate container pricing quote.
Send us your specifications, required tensile strengths, dimension standards (DIN, ISO, ASTM), and yearly volume requirements. Our engineers will reply within 12 business hours.
