S-93852A161 1.875" ID x 4" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and black-oxide coating, ideal for harsh industrial environments
• Enhanced load distribution across a large 4" OD surface, preventing surface damage and fastener loosening
• Precise dimensional fit with 1.875" ID, ensuring secure seating for 1 3/4" screws and reliable assembly performance
• Compliance with ASME B18.21.1 standards, guaranteeing consistent quality and interchangeability in USS flat washer applications
• Long-term reliability in chemical-exposed settings due to RoHS 3 and REACH compliance, reducing replacement frequency
• Durable material integrity from 18-8 stainless steel, maintaining structural stability under continuous mechanical stress
• Versatile industrial usability with a thickness range of 0.153-0.213", accommodating varying gap and tension requirements

Professional Applications & Engineering Value

These black-oxide 18-8 stainless steel flat washers address critical challenges in heavy-duty industrial assemblies, such as corrosion-induced failure and uneven load bearing. The USS designation and ASME B18.21.1 compliance ensure precise dimensional control, minimizing misalignment in machinery, construction, and marine equipment. The black-oxide coating enhances surface durability against moisture and chemicals, while the large 4" OD effectively disperses pressure, protecting soft substrates and extending joint life. Ideal for corrosion-resistant applications like structural bolting, pipeline flanges, and outdoor installations, these washers deliver consistent performance under high-stress conditions, reducing maintenance costs and downtime.

Specification Summary & Compliance

This flat washer meets ASME B18.21.1 specifications for dimensional accuracy, with an inner diameter of 1.875", outer diameter of 4", and thickness ranging from 0.153" to 0.213". It is manufactured from 18-8 stainless steel with a black-oxide finish and is designed to fit 1 3/4" screw sizes. The product fully complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards for industrial components.