Products Description
In the competitive world of industrial fasteners, material selection is the difference between a project that lasts decades and one that fails prematurely. Sunning Industries provides specialized solutions in Stainless Steel and Brass, catering to industries where corrosion resistance, conductivity, and aesthetic appeal are paramount.
With 20 years of manufacturing expertise in Handan and a global export network managed from Zhengzhou, we ensure our non-ferrous and alloy fasteners meet the precise DIN, ISO, and ANSI standards required by our partners in Europe, America, and the CIS region.
Specialty Material Fasteners
Whether you are dealing with marine environments, chemical processing, or high-end electrical engineering, our stainless steel and brass ranges offer the specific chemical properties your application demands.
1. Stainless Steel: The Ultimate Corrosion Defense
We primarily focus on Austenitic stainless steel (A2 and A4), which provides an excellent balance of strength and resistance to oxidation.
Table 1: Stainless Steel Grade Comparison (Metric & ANSI)
| Material Grade | DIN/ISO Class | AISI Equivalent | Characteristics | Best Applications |
| Stainless Steel 304 | A2-70 / A2-80 | Type 304 | High oxidation resistance | Food processing, Kitchenware |
| Stainless Steel 316 | A4-70 / A4-80 | Type 316 | Added Molybdenum (2-3%) | Marine, Coastal, Medical |
| Stainless Steel 316L | A4L | Type 316L | Extra-low carbon | Heavy-duty welding, Pulp & Paper |
2. Brass: Conductivity and Precision
Brass fasteners are the preferred choice for electrical components and decorative hardware due to their non-magnetic properties and natural resistance to sparking.
Table 2: Brass Fastener Technical Specifications
| Component Type | Standard | Common Alloy | Physical Property | Benefit |
| Brass Hex Bolt | DIN 933 | CuZn37 / CZ108 | Non-Magnetic | Safe for sensitive electronics |
| Brass Nut | DIN 934 | CuZn39Pb3 | Low Friction | Prevents thread galling |
| Brass Washer | DIN 125 | MS63 | Decorative Finish | High aesthetic value |
| Brass Machine Screw | DIN 7985 | CuZn40 | High Conductivity | Electrical earthing/grounding |
3. Dimensional Reference (Metric Stainless Steel A2/A4)
Our stainless steel fasteners are manufactured to high tolerances to ensure they perform reliably under mechanical stress.
Table 3: Common Dimensions for Stainless Steel Hex Bolts (DIN 933)
| Nominal Size | Thread Pitch (mm) | Head Width (mm) | Head Height (mm) | Proof Load (min) |
| M8 | 1.25 | 13.0 | 5.3 | 700 N/mm² (A2-70) |
| M10 | 1.50 | 17.0 | 6.4 | 700 N/mm² (A2-70) |
| M12 | 1.75 | 19.0 | 7.5 | 800 N/mm² (A4-80) |
| M16 | 2.00 | 24.0 | 10.0 | 800 N/mm² (A4-80) |
Why Choose Sunning Industries for Specialty Materials?
Certified Metallurgy: Every stainless steel shipment is accompanied by a Spectrometer Analysis Report, ensuring the Nickel and Chromium content matches the Grade 304/316 requirements.
Anti-Galling Solutions: Stainless steel is prone to cold-welding (galling). We offer specialized wax coatings and precision threading to minimize this risk during installation.
Global Compliance: Our products are 100% compliant with REACH and RoHS standards, essential for the European and American electronics and medical markets.
Professional Q&A
Q: When should I upgrade from A2 (304) to A4 (316) Stainless Steel?
A: If your project is within 5 kilometers of the ocean or involves exposure to chlorides (like swimming pools or chemical plants), A4 (316) is essential. The addition of Molybdenum in A4 provides specific resistance to "pitting corrosion," which can cause A2 to develop brown tea-staining in salty environments.
Q: Is brass suitable for outdoor structural use?
A: Brass is highly resistant to corrosion but has lower tensile strength than steel. It is perfect for outdoor decorative use or marine hardware (where it develops a protective patina), but it should not be used for heavy structural load-bearing applications where high-tensile steel is required.
Q: Do you offer "Passivation" for your stainless steel fasteners?
A: Yes. All our stainless fasteners undergo a passivation process (per ASTM A967). This chemical treatment removes surface iron and enhances the protective chromium-oxide layer, significantly increasing the material's natural corrosion resistance.