Stainless Steel Flat Washers China Factory and Leading Suppliers ISO DIN ASME
Longze Stainless Steel Flat Washers, also known as Plain Washers, are high-precision load-distribution components engineered to meet the rigorous demands of industrial assembly. Manufactured in strict accordance with ISO 7089, DIN 125, and ASME B18.22.1 international standards, these washers are critical for protecting connected surfaces and ensuring the stability of mechanical joints by distributing the pressure of nuts or bolt heads over a broader area.
Forged from premium SS304 and SS316 stainless steel, our washers provide exceptional durability and lifelong corrosion resistance. Whether you are operating in general construction or highly corrosive marine and chemical environments, Longze ensures a burr-free finish and precise concentricity to prevent galling, reduce stress on joints, and ensure seamless compatibility with both Metric and Imperial fastening systems.
Detailed Parameters
| Technical Standards | ISO 7089 / DIN 125 (Metric), ASME B18.22.1 (Imperial) | Material Grades | A2-70 (SS304), A4-80 (SS316), 316L Low Carbon |
|---|---|---|---|
| Metric Size Range | M1.6 to M100 (ID 1.7mm to 104mm) | Inch Size Range | #0 to 4" (ID 0.060" to 4.125") |
| Thickness Range | 0.3 mm to 10.0 mm (Standard & Extra Thick) | Hardness Options | 140HV / 200HV / 300HV |
| Surface Finishes | Plain, Passivated, Electro-Polished | Certification | ISO 9001 Certified Production |
| Verification Method | PMI Spectrum Analysis for Material Compliance | Edge Treatment | Precision Deburring and Polishing |
Key Advantages
Surface Protection
Prevents bolt heads or nuts from galling or crushing the material surface during high-torque tightening applications.
Corrosion Resistance
SS316 Marine Grade offers superior protection against high-chloride, acidic, and salt-spray environments.
High-Precision Stamping
Strict concentricity control ensures the inner diameter fits perfectly over the bolt shank without excessive play.
Flatness Stability
Controlled manufacturing prevents cupping or warping, ensuring a uniform 360-degree seal and pressure distribution.
Deburred Edges
Every batch undergoes polishing to remove sharp edges, protecting technicians and the finished project surface.
Global Compatibility
Full range of Metric and Imperial sizes ensuring 100% compatibility across all international property classes.
Product Gallery
Management Platforms
Quality Certification
ISO 9001 certified production ensuring consistent quality across every batch produced.
Optical Sorting
Automated optical sorting technology to ensure zero defects in outer diameter and thickness.
Material Verification
PMI spectrum analysis on every raw material coil for 100% grade compliance.
Export Packaging
Double-walled export cartons and moisture-proof pallets for secure sea freight.
Custom Sizing
Flexible manufacturing for standard and extra-thick options to meet specific project needs.
Technical Support
Professional guidance on material selection to match the service life of your equipment.
Investment Return Comparison
| Material Grade | Service Life | Maintenance Cost |
|---|---|---|
| Standard Carbon Steel | Short (Corrodes Fast) | High (Frequent Replacement) |
| Stainless Steel A2 (304) | Long (General Use) | Low (Occasional Check) |
| Stainless Steel A4 (316) | Very Long (Marine) | Very Low (Extreme Durability) |
| Stainless Steel 316L | Extreme (Welded) | Minimal (High Heat Resistant) |
| Longze Precision Range | Maximum (Optimized) | Lowest (Perfect Fit/No Galling) |
Frequently Asked Questions
Raw SS304 is typically non-magnetic. However, during the cold-stamping process used to manufacture washers, some magnetic properties may develop due to changes in the crystal structure. This does not compromise its corrosion resistance.
Longze recommends SS316 for applications within 5 miles (8km) of the ocean or in environments exposed to chlorine, sulfuric acid, or other high-chloride chemical agents.
While stacking can bridge gaps, Longze recommends using a single, thicker washer for structural integrity and more stable load distribution in high-load applications.
To prevent galvanic corrosion, always ensure material pairing: pair stainless steel washers specifically with stainless steel bolts and nuts of the same grade.
Passivation is a chemical cleaning process that enhances the oxide layer for medical/food use. Electro-polishing provides an ultra-smooth mirror finish ideal for high-end marine and yachting applications.
Yes, we support a full range of Metric (M1.6 - M100) based on DIN/ISO standards and Imperial (#0 - 4") based on ASME B18.22.1 standards for global project compatibility.
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