Recommend Products
Name: Fujian Monel 400 Double End Stud Material: Monel 400 Standard: ASME B18.2.1 Size: 5/16 to 4 inch Length: 30 to 1000 mm Class: 12.9 Feature: Resistant to hydrofluoric acidQS Fastener: Monel 400 Double End Stud
Name: Inconel 625 Double End Stud Material: Inconel 625 Standard: ASME B18.2.1 Size: 5/16 to 4 inch Length: 30 to 1000 mm Class: 12.9 Feature: High Yield Strength, Durable Strength and Corrosion ResistanceQS Fastener: Inconel 625 Double End Stud
Name: Xiamen Inconel 600 High Strength Fastener Material: Inconel 600 Standard: ASME Size: 5/16 to 4 inch Length: 30 to 1000 mm Class: 12.9 Feature: High Yield Strength, Durable Strength and Corrosion ResistanceQS Fastener: Inconel 600 High Strength Fastener
Name: Inconel 600 Stud Bolt Putian Material: Inconel 600 Standard: ASME B18.2.1 Size: 5/16 to 4 inch Length: 30 to 1000 mm Class: 12.9 Feature: High Yield Strength, Durable Strength and Corrosion ResistanceQS Fastener: Inconel 600 Stud Bolt
Flat Washer China Manufacturer
QS Fastener: Flat Washer China Manufacturer
Name: Flat Washer China Manufacturer
Standard: ANSI B18.22.1
Material: 304
Size: 1-1/2 inch
Tickness: 4 mm
Surface: Natural color
Standard: ANSI B18.22.1
Material: 304
Size: 1-1/2 inch
Tickness: 4 mm
Surface: Natural color
Quantity
As a specialized China Manufacturer of industrial fasteners, we supply the ANSI B18.22.1 SAE narrow-type flat washer in the 1-1/2 inch nominal size. Produced from grade 304 stainless steel with a 4 mm thickness and a natural (mill) surface finish, this flat washer delivers a balanced combination of mechanical strength and corrosion resistance. Its narrow outer diameter is purpose-designed for bolted assemblies where space is constrained, helping to distribute clamp load evenly, reduce embedding and contact impressions, and extend the fatigue life of the joint. Typical applications include chemical processing piping, outdoor structural steelwork, marine deck fittings, food-processing equipment, and precision machinery where consistent preload and resistance to environmental attack are critical. Large production lots are maintained in our warehouse, supporting rapid dispatch for both OEM and distribution orders.
Corrosion Mechanisms Affecting Stainless Steel Fasteners
While 304 stainless steel is chosen for its passive chromium-oxide surface layer, this film is not impervious. The 1.5 inch flat washer, like all stainless components, remains susceptible to localized attack when the passive layer is breached. Five common corrosive scenarios are particularly relevant:
While 304 stainless steel is chosen for its passive chromium-oxide surface layer, this film is not impervious. The 1.5 inch flat washer, like all stainless components, remains susceptible to localized attack when the passive layer is breached. Five common corrosive scenarios are particularly relevant:
1. Galvanic coupling – Dust or metallic debris containing dissimilar elements (e.g., carbon steel particles, copper fines) can settle on the washer surface. In humid conditions, condensed moisture converts these contaminants into a micro-electrolytic cell, initiating pitting and undermining the oxide film.
2. Organic acid attack – Residues from foodstuffs, vegetable juices, or starchy liquids (such as noodle broth) left on the flat washer surface can ferment and produce organic acids when oxygen and moisture are present, gradually etching the protective layer.
3. Chemical pitting – Direct contact with acidic, alkaline, or saline compounds – for example, limewash or concrete splatter from construction sites – creates highly localized aggressive environments that accelerate crater-like corrosion.
4. Atmospheric chemical corrosion – In industrial or urban areas with elevated sulfur dioxide, carbon oxides, or nitrogen oxide emissions, dew or rain can form dilute sulfuric, nitric, or acetic acid droplets. These condensed acids aggressively attack the 1-1/2 inch flat washer, even in moderate temperatures.
5. Coastal salt exposure – Airborne chloride-laden moisture in seaside regions deposits salts onto the fastener surface, which easily breaches the passive film and leads to stress-corrosion cracking or general pitting if not managed.
Maintenance Best Practices
To maximize service life of this flat washer, we recommend routine cleaning with clean water or a mild neutral detergent to remove surface deposits, especially after exposure to pollutants or process chemicals. During installation, avoid direct metal-to-metal contact with dissimilar alloys (e.g., aluminum, copper, or carbon steel) to prevent galvanic cells. For aggressive environments – high humidity, industrial fumes, or direct salt spray – upgrading to a 316-grade equivalent and supplementing with a suitable anti-corrosion wax or epoxy coating is advised. Regular visual inspection and torque-checking further ensure long-term joint integrity.
To maximize service life of this flat washer, we recommend routine cleaning with clean water or a mild neutral detergent to remove surface deposits, especially after exposure to pollutants or process chemicals. During installation, avoid direct metal-to-metal contact with dissimilar alloys (e.g., aluminum, copper, or carbon steel) to prevent galvanic cells. For aggressive environments – high humidity, industrial fumes, or direct salt spray – upgrading to a 316-grade equivalent and supplementing with a suitable anti-corrosion wax or epoxy coating is advised. Regular visual inspection and torque-checking further ensure long-term joint integrity.
As a reliable China Manufacturer, we combine technical expertise with responsive logistics, offering this 1.5 inch flat washer in standard and custom packaging to meet project deadlines. For critical service conditions, our engineering team is available to recommend material upgrades or surface treatments tailored to your operating environment. Choose our flat washer for dependable performance, backed by consistent quality control and fast delivery.
Send Message
