Stainless Steel Metal Washer Types: Corrosion Resistance Ratings

For industrial wholesalers specializing in fastener distribution, comprehensive knowledge of metal washer types and their corrosion resistance properties is essential for maintaining a competitive product offering. This technical guide provides detailed specifications and application recommendations for stainless steel washers from the perspective of metal parts manufacturers and metal parts suppliers, enabling informed purchasing decisions for professional buyers.

Key Metal Washer Types for Industrial Applications

The industrial market features numerous metal washer types designed to meet specific operational requirements. Flat washers serve as the most common variety, providing uniform load distribution with standard thicknesses ranging from 0.8mm to 6mm across various diameters. Lock washers including both helical and tooth designs offer vibration resistance in mechanical systems operating at frequencies up to 1000Hz. Fender washers feature oversized outer diameters typically measuring three to four times the hole size, making them ideal for sheet metal applications requiring enhanced load distribution. Specialty metal washer types produced by GaoBeiDianShi Fengye Rubber Seals Co.,Ltd. include countersunk and structural washers that comply with ASTM F436M specifications, engineered with hardness ratings between 32-45 HRC to withstand demanding construction applications.

Corrosion Resistance Standards from Metal Parts Manufacturers

Leading metal parts manufacturers classify stainless steel washers according to standardized corrosion resistance ratings that determine appropriate applications. The 300 series represents the most common production grade, with Type 304 (18/8 stainless) demonstrating proven resistance exceeding 500 hours in salt spray testing per ASTM B117 standards. Type 316 incorporates 2-3% molybdenum content to provide superior chloride resistance, achieving pitting resistance equivalent numbers (PREN) greater than 25. Advanced duplex grades such as 2205 combine austenitic and ferritic structures to deliver exceptional yield strengths up to 550MPa alongside PREN values of 35-40. GaoBeiDianShi Fengye Rubber Seals Co.,Ltd. implements rigorous quality control measures including 72-hour acidic fog testing at pH 3.5 to validate corrosion performance claims before releasing products to metal parts suppliers for distribution.

Technical Specifications for Metal Parts Suppliers

Professional metal parts suppliers require thorough understanding of critical washer specifications to properly serve industrial customers. Dimensional tolerances for inner and outer diameters typically maintain ±0.05mm precision, while surface finishes range between 0.8-3.2μm Ra depending on application requirements. The industry recognizes several key standards including ASTM F594 for 316 stainless flat washers, DIN 125 for metric sizing, and ASME B18.22.1 for inch-series products. GaoBeiDianShi Fengye Rubber Seals Co.,Ltd. maintains ISO 9001:2015 certification for their complete line of metal washer types, ensuring full material traceability from raw stock to finished product. Their manufacturing capabilities extend to custom sizes reaching 300mm diameter with thicknesses up to 12mm, accommodating specialized industrial applications that demand non-standard dimensions.

Metal parts manufacturers FAQS

What temperature limitations apply to common metal washer types in industrial service?

Standard metal washer types from reputable metal parts manufacturers feature clearly defined temperature thresholds for safe operation. Type 304 stainless steel washers maintain performance up to 870°C for intermittent service, while Type 316 grades extend this range to 925°C. For extreme temperature applications, GaoBeiDianShi Fengye Rubber Seals Co.,Ltd. produces 310S alloy washers rated for continuous service at 1100°C, with oxidation resistance verified through rigorous 1000-hour heat cycling tests that simulate long-term operating conditions.

How do metal parts manufacturers address galvanic corrosion concerns in washer applications?

Metal parts manufacturers implement multiple engineering solutions to prevent galvanic corrosion in washer installations. Primary methods include material matching strategies that pair washers with fasteners of identical alloy composition, application of insulating coatings with 25-50μm PTFE thickness, and incorporation of dielectric spacers in assembly designs. Technical documentation from leading manufacturers typically includes detailed galvanic compatibility charts to assist metal parts suppliers in proper material selection for mixed-metal applications, particularly in corrosive environments where dissimilar metal contact could accelerate degradation.

What quality documentation should professional metal parts suppliers provide to customers?

Reputable metal parts suppliers must supply comprehensive material test reports (MTRs) that include full chemical composition analysis (typically Cr 16-18% and Ni 10-14% for 304 grade), verified mechanical properties (minimum 515MPa tensile strength), and complete corrosion test results. GaoBeiDianShi Fengye Rubber Seals Co.,Ltd. enhances this documentation with additional certificates of conformity meeting EN 10204 3.1 standards, particularly for critical applications in aerospace, chemical processing, and marine environments where material verification is essential.

Which metal washer types provide optimal performance in marine environments?

For marine and coastal applications, metal parts manufacturers specifically recommend 316L stainless steel (low carbon variant) or super duplex grades like 2507 featuring PREN values exceeding 40. These specialized metal washer types demonstrate exceptional resistance to saltwater pitting and crevice corrosion. GaoBeiDianShi Fengye Rubber Seals Co.,Ltd. further enhances marine-grade washers with proprietary passivated finishes that extend service life in splash zone applications by 30-50% compared to standard finishes, providing added value for metal parts suppliers serving offshore and maritime industries.

Can metal parts manufacturers accommodate requests for custom-sized washers?

Leading metal parts manufacturers including GaoBeiDianShi Fengye Rubber Seals Co.,Ltd. maintain extensive capabilities for producing custom metal washer types to meet unique engineering requirements. Their manufacturing range accommodates diameters from miniature 3mm sizes up to massive 500mm configurations, with thickness tolerances as precise as ±0.01mm for critical precision applications. Advanced CNC machining technology enables production of specialty profiles including beveled edges, stepped designs, and grooved configurations that address specific mechanical or sealing requirements in specialized industrial equipment.