Explore our top-tier collection of wholesale nails, screws, bolts, and specialized industrial locking elements manufactured using advanced cold-heading machinery.
Acorn nuts (also known as dome nuts or hex cap nuts) serve a vital dual purpose: they protect vulnerable thread protrusions from corrosion and mechanical damage while preventing personal injury caused by sharp bolt threads. The global demand for these specialized fasteners is driven by key heavy industries including maritime infrastructure, medical technology, food and beverage processing, high-speed rail, and precision automotive assembly.
By enclosing the protruding thread end, acorn nuts shield fasteners against chemicals, humidity, and atmospheric saline, drastically extending the service life of critical structural nodes.
In pharmaceutical and food processing facilities, exposed threads collect biological contaminants. Domed stainless steel fasteners provide smooth, wash-down-friendly surfaces that reduce bacterial contamination risks.
Machinery operators and maintenance personnel face continuous hazards from exposed studs. Acorn nuts remove sharp projections, ensuring compliance with OSHA and international occupational safety regulations.
In B2B purchasing, selecting an ODM manufacturer for Stainless Steel Acorn Nuts requires looking closely at manufacturing standards. Factories must supply products conforming to precise metric systems (DIN 1587, DIN 917, DIN 986) or unified imperial systems (ASME/ANSI B18.6.9). The metallurgical properties of the raw material—such as grade AISI 304 (A2-70) for general atmospheric durability and AISI 316 (A4-80) for marine-grade acidic environments—are critical variables in minimizing maintenance overhead and achieving zero-failure rates in aggressive field applications.
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.
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.
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).
Get a Quick Quote
Our ODM and OEM customization capability supports a broad selection of thread types, materials, and dimensional tolerances. Below is the standard engineering layout for DIN 1587 (High Type Cap/Acorn Nuts) and ASME B18.6.9.
| Thread Metric (d) | Pitch (P) | Hex Width (s) | Total Height (h) | Dome Diameter (dk) | Min. Thread Depth (t) | Material Class Options |
|---|---|---|---|---|---|---|
| M3 | 0.50 mm | 5.50 mm | 6.00 mm | 5.00 mm | 4.50 mm | SUS304 / SUS316 / Duplex |
| M4 | 0.70 mm | 7.00 mm | 8.00 mm | 6.50 mm | 5.26 mm | SUS304 / SUS316 / Duplex |
| M5 | 0.80 mm | 8.00 mm | 10.00 mm | 7.50 mm | 7.21 mm | SUS304 / SUS316 / A4-80 |
| M6 | 1.00 mm | 10.00 mm | 12.00 mm | 9.50 mm | 8.00 mm | SUS304 / SUS316 / A4-80 |
| M8 | 1.25 mm | 13.00 mm | 15.00 mm | 12.50 mm | 11.00 mm | SUS304 / SUS316 / A4-80 |
| M10 | 1.50 mm | 17.00 mm | 18.00 mm | 15.00 mm | 13.00 mm | SUS304 / SUS316 / A4-80 |
| M12 | 1.75 mm | 19.00 mm | 22.00 mm | 17.00 mm | 16.00 mm | SUS304 / SUS316 / Super Duplex |
| M16 | 2.00 mm | 24.00 mm | 28.00 mm | 23.00 mm | 21.00 mm | SUS304 / SUS316 / Super Duplex |
Stainless steel alloys naturally construct a protective chromium oxide surface layer that prevents corrosion. However, during rapid mechanical tightening, this oxide layer can rub off under pressure, leading to high friction, localized heat buildup, and eventual welding of the mating threads (known as thread galling). Sinsun Hardware prevents this phenomenon through key engineering controls:
Our ODM stainless steel acorn nuts are optimized for challenging and regulated physical environments worldwide.
Utilizing high-purity duplex and AISI 316 stainless steels, these dome nuts resist continuous exposure to salt spray and high-chloride environments without pitting or crevice corrosion.
Eliminating exposed threads prevents bio-film accumulation. The highly polished cap surfaces allow for aggressive CIP (Clean-in-Place) sanitization procedures with chemical solvents.
Engineered to withstand intense mechanical stress and continuous structural vibration, Sinsun cap nuts maintain a tight hold without fatiguing, protecting passenger and operator areas.
Sinsun acorn nuts are specified by architectural designers globally for clean, modern aesthetics on visible glass framing and structural columns, offering a premium and safe finish.
Our structured ODM engineering workflow ensures transparency, strict material traceability, and prompt delivery schedules for every project.
We review your CAD designs, working environment, mechanical stress parameters, and chemical exposure risks to choose the ideal alloy.
Our technical team generates precise 3D modeling and outputs physical prototypes to verify dimensions, fits, and assembly clearances.
Prototypes undergo tensile testing, hardness measurements (HRC 28-32), and salt spray testing to confirm corrosion resistance.
With 200+ German cold heading machines and four heat treatment lines, we transition approved designs into volume production.
Finished lots are packaged, barcoded, and stored in our smart warehouse, with complete mill test certificates provided upon dispatch.
Below are real-world application examples demonstrating our specialized fastener engineering capabilities.
Get professional answers directly from Sinsun Hardware's metallurgical specialists and product managers.
Our comprehensive catalog covers over 20,000 SKUs designed to optimize structural connections in automotive, marine, and construction industries.
SINSUN
