Direct supply options from our Northern China integrated manufacturing base. Discover industry-grade fasteners engineered for durability, dimensional precision, and optimal torque.
Understanding the critical balance of metallurgy, production standards, and mechanical loading for optimal industrial utility.
Stainless steel wing nuts (commonly recognized as butterfly nuts) are distinctively engineered with two protruding metal wings, allowing for tool-free, hand-tightened fastening in applications requiring frequent maintenance, adjustment, or sanitization. Unlike standard hex nuts, a wing nut converts manual rotational force directly into axial clamping force.
Cold Forged vs. Cast Steel: Under standard mechanical conditions, casting can result in micro-porosity within the material structure. Cold forged wing nuts (DIN 315) are produced under extreme pressure, which aligns the grain boundaries of the stainless steel along the contours of the wings. This cold-work hardening elevates the ultimate tensile strength (UTS) and fatigue limit, preventing structural wing shear-off under high vibration loads.
Thread Integrity & Class Compliance: Our internal tooling maintains tight control over thread geometry, achieving standard Class 6H fit for metric threads and 2B for unified coarse/fine threads (UNC/UNF). Tight tolerance prevent thread galling, which is a common issue with stainless steel installations.
Grade 304 provides cost-effective atmospheric corrosion resistance for general manufacturing. Grade 316 features 2-3% Molybdenum content, elevating its pitting resistance in saline environments, marine hulls, and acidic chemical processing equipment.
We ensure strict compliance to standard dimensions. Metric DIN 315 coordinates wing width, height, and root thickness, whereas ASME B18.17 governs American Standard styles, including light, heavy, and stamped variants to ensure correct load distribution.
Post-forging acid passivation strips free iron contaminants from the surface, forming a dense chromium-oxide passive layer. This process guarantees 1,000+ hours of salt spray exposure without cosmetic or structural oxidation.
A leading manufacturer and global supplier of high-quality fasteners in Northern China since 2006.
Sinsun Hardware operates from a 30,000 sqm integrated facility, housing advanced production zones, a 12,000 sqm smart warehouse with an 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 capability is backed by German-imported machinery, precision Taiwanese technology, and a dedicated team 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 specialize in customized fastening solutions. Our technical team works directly with clients from design to manufacturing, providing support for specialized materials, custom coatings, non-standard dimensions, and specific mechanical performance requirements.
Why industrial procurement teams leverage our Northern China manufacturing cluster for high-volume stainless steel wing nut requirements.
We source high-grade steel rods directly from XING TAI Steel and Ansteel Group (consuming 10,000+ tons of steel annually). Buying raw materials in volume protects our clients from market price fluctuations. We also perform in-house spheroidizing annealing and wire drawing to ensure consistent metallurgical structure before forging.
Equipped with over 200 German-imported multi-station cold heading machines and Taiwanese production tech, we achieve high output rates (up to 1,200+ pieces/minute per machine). This process produces clean edges, precise wing curves, and consistent head alignments with minimal scrap material.
Sinsun runs 4 in-house gas-fired mesh belt heat treatment lines, processing 20 tons per day. Controlling the temperature cycles internally allows us to manage core hardness, case depth, and tensile strengths, preventing the lead time delays associated with third-party processing.
Our 12,000 sqm smart warehouse features automated packaging lines capable of processing 3,000+ cartons per hour. Real-time ERP tracking ensures accurate inventory counts, efficient order prep, and coordinated dispatch, achieving an on-time delivery rate exceeding 99%.
Reference technical chart for standard metric sizes. Custom threads (UNC/UNF) and variations are manufactured to customer specifications.
| Thread Diameter (d) | Pitch (mm) | Wing Width / Span (e max. mm) | Wing Height (h max. mm) | Nut Thickness (m max. mm) | Edge Thickness (g mm) |
|---|---|---|---|---|---|
| M3 | 0.5 | 17.6 | 8.6 | 3.0 | 1.6 |
| M4 | 0.7 | 20.0 | 10.5 | 4.6 | 2.0 |
| M5 | 0.8 | 26.0 | 13.0 | 6.5 | 2.3 |
| M6 | 1.0 | 33.0 | 17.0 | 8.0 | 3.0 |
| M8 | 1.25 | 39.0 | 20.0 | 10.0 | 4.0 |
| M10 | 1.5 | 51.0 | 25.0 | 12.0 | 5.0 |
| M12 | 1.75 | 65.0 | 33.5 | 14.0 | 6.0 |
| M16 | 2.0 | 73.0 | 37.5 | 17.0 | 8.0 |
*Note: The dimensions above are based on the standard DIN 315 specification. ASME B18.17 (types A, B, C, D) specifications are also available upon request.
Providing corrosion resistance and quick-release performance across diverse industrial environments.
Outdoor photovoltaic racking systems require fast manual adjustment capabilities. Sinsun Grade 316 Stainless Steel Wing Nuts withstand harsh weather conditions, UV exposure, and thermal cycling, ensuring structural integrity over a 25-year service life.
High-salinity coastal environments accelerate chloride stress corrosion cracking. Our passivated wing nuts are used in vessel hatches, lighting structures, and seawater filtration equipment to facilitate rapid maintenance access without seizing.
Hygiene standards require frequent washdowns and clean-in-place (CIP) procedures. With surface finishes optimized to Ra ≤ 0.4μm, our wing nuts prevent bacterial build-up and resist corrosion from chemical cleaning agents.
Our commitment to precision, quality assurance, and customer service supports global OEM and distribution networks.
We assist in optimizing joint designs, select appropriate materials, perform cost-benefit analyses, and provide complimentary sample testing to verify installation torque and joint safety.
We track production from raw material melt to the finished fastener. Our quality management system provides full certification, with lab testing for hardness, chemical composition, torque, and salt spray resistance.
Utilizing an ERP-driven smart warehousing system, we manage inventory dynamically to keep lead times consistent. Our on-time delivery rate remains above 99% for regular contract shipments.
We offer custom manufacturing tailored to your applications, including reverse engineering, custom thread configurations, non-standard dimensions, and specialized finishes (such as Dacromet or zinc diffusion coating).
Our international sales and service team provides 24/7 technical and commercial support, coordinating customs logistics and direct-to-warehouse delivery to simplify global sourcing.
Tracking our history of expansion, technological integration, and end-to-end quality control.
Founded as Northern China fastener startup.
Expanded export network internationally.
Integrated German & Taiwanese machinery.
Added 12,000 sqm automated warehouse.
Achieved 36,000-ton annual output limit.
Combining advanced production tech with engineering expertise to serve automotive, marine, construction, and electronics sectors.
Our engineering team assists with concept development, stress analysis, CAD modeling, and material selection (carbon steel, high-tensile alloys, stainless steel, and brass) to ensure components are suited to their application.
We utilize cold forging, hot forging, CNC machining, and high-precision thread rolling to manufacture durable fasteners with tight tolerances, clean finishes, and consistent mechanical properties.
Quality control is integrated at each step, from checking raw material microstructures to performing dimensional inspections, tensile strength testing, and torque-tension analysis.
We provide customized OEM/ODM packaging, automated sorting, and complete export documentation to ensure orders arrive safely and on schedule.
A structured workflow designed to maintain transparency, quality, and on-time delivery from inquiry to final shipment.
Reviewing application demands and specifications.
Providing technical recommendations and project quotes.
Producing prototypes for physical evaluation.
Running mass production with active QC checks.
Verifying final dimensional and mechanical specs.
Coordinating shipping and follow-up support.
Real-world examples of Sinsun engineering solutions addressing performance and environmental requirements.
Challenge: A Tier-1 automotive supplier required custom flange bolts with high vibration resistance and reduced component weight.
Solution: We redesigned the fastener using a specialized alloy and modified thread profile, verifying performance through vibration testing.
Result: Achieved a 15% weight reduction, passed 2,000-hour vibration tests, and integrated into high-speed assembly lines.
Challenge: An offshore engineering firm needed large-diameter bolts with high corrosion resistance for saltwater environments.
Solution: Sinsun supplied duplex stainless-steel fasteners with a specialized passivation coating, accompanied by material certification.
Result: Completed installation with zero corrosion-related failures, meeting durability targets.
Explore our main product lines, manufactured to international standards for construction, automotive, and industrial assemblies.
We host on-site factory visits and participate in international trade exhibitions to build transparent, long-term partnerships.
Technical answers to common questions about sourcing, manufacturing, and application standards.
We offer flexible volume terms. While our facility is set up for automated high-volume production runs, we also accommodate smaller MOQs for prototyping, custom designs, and initial projects. Please contact our support team to discuss your requirements.
Yes. Custom manufacturing based on engineering drawings is a core specialty. We manufacture to international standards, including ISO, DIN, ANSI/ASME, and JIS, and can customize parameters such as materials, pitches, dimensions, and coatings.
We monitor quality at every step, using statistical process control (SPC) for dimensional accuracy. Raw materials undergo metallurgical inspections, and finished goods are checked for hardness, thread fit, tensile strength, and corrosion resistance. Inspection reports are available for every shipment.
Lead times vary depending on size, volume, tooling requirements, and finishing processes. Standard fasteners are typically dispatched within 4 to 6 weeks. We provide firm timeline estimates with every quotation.
Yes, we provide pre-production samples for physical evaluation, dimensional verification, and application testing prior to starting mass production.
Cold forging compresses the metal grain, increasing the mechanical strength of the wings. Cast wing nuts can contain internal air pockets that make them brittle under load, while stamped wing nuts are often limited to light-duty applications. Cold-forged nuts are preferred for industrial assemblies due to their higher shear and torque resistance.
Thread galling occurs when friction and pressure break down the oxide surface layer of stainless steel threads, causing them to lock. We mitigate this by maintaining precise thread tolerances, using specialized lubricants, and offering custom anti-friction coatings (like zinc or molybdenum disulfide) for high-pressure installations.
Explore our complete range of specialized industrial fasteners, manufactured for construction, electrical, and marine applications.
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