S-90313A306 1.75" ID x 4" OD Oversized Washers

Key Features & Benefits at a Glance

• Exceptional corrosion resistance from 18-8 Stainless Steel material, ensuring long-term reliability in harsh or humid industrial environments.
• Superior load distribution with a large 4" outer diameter, minimizing surface pressure and preventing damage to connected materials.
• Precise fit for 1 1/2" screws with a 1.75" inner diameter, ensuring secure fastening and reducing assembly time.
• Heavy-duty thickness (0.302-0.335") provides enhanced durability and stability under high-stress mechanical applications.
• Compliance with RoHS 3 and REACH regulations guarantees safe, environmentally responsible use in global markets.
• Ideal for inch-system projects, offering seamless compatibility with standard imperial-sized components and reducing sourcing complexity.
• Versatile industrial application due to robust stainless steel construction, suitable for machinery, construction, and marine uses.

Professional Applications & Engineering Value

This 18-8 Stainless Steel Flat Washer is engineered to address critical challenges in heavy-load and corrosive environments. Its substantial 4" OD and 1.75" ID provide optimal surface coverage, effectively distributing clamp load and preventing joint failure or material indentation. The corrosion-resistant properties of 18-8 stainless steel make it indispensable in applications exposed to moisture, chemicals, or outdoor elements—such as structural steelwork, marine equipment, and food processing machinery. By utilizing this industrial-grade washer, engineers and procurement specialists can enhance assembly longevity, reduce maintenance costs, and ensure compliance with stringent industry standards for safety and performance.

Specification Summary & Compliance

This flat washer conforms to inch system measurements with an inner diameter of 1.75", outer diameter of 4", and thickness ranging from 0.302" to 0.335", designed specifically for use with 1 1/2" screws. Manufactured from 18-8 Stainless Steel, it meets general industry standards for flat washers without a specific hardness rating. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for use in regulated markets.