S-91081A031 0.438" ID x 1" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Enhanced load distribution with 1" outer diameter to prevent surface damage and maintain joint integrity
• Precise 3/8" screw compatibility with 0.438" inner diameter ensuring perfect fit and vibration resistance
• Durable steel construction providing reliable strength and corrosion resistance for industrial environments
• Optimized thickness range (0.064-0.104") offering flexibility for various compression and spacing requirements
• Full ASME B18.21.1 compliance guaranteeing dimensional accuracy and interchangeability in mechanical assemblies
• RoHS 3 and REACH compliance ensuring environmental safety and regulatory acceptance in global markets
• USS standard design delivering proven performance in heavy-duty applications and structural fastening

Professional Applications & Engineering Value

This USS flat washer delivers critical engineering value by solving common industrial fastening challenges. The steel construction provides exceptional durability against wear and environmental factors, while the precise 1" OD and 0.438" ID dimensions ensure optimal load distribution across connected surfaces. These flat washers effectively prevent bolt head embedment, reduce loosening from vibration, and maintain clamp force in 3/8" screw applications across machinery, structural steel connections, and heavy equipment. The ASME B18.21.1 standard compliance guarantees consistent performance in demanding industrial settings where reliability is paramount.

Specification Summary & Compliance

This USS flat washer meets ASME B18.21.1 dimensional specifications with precise inch system measurements: 1" outer diameter, 0.438" inner diameter, and thickness ranging 0.064-0.104". The manufacturing process adheres to strict quality standards for flat washer production, ensuring consistent performance in mechanical fastening applications. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental responsibility and material safety for industrial use worldwide.