S-94744A504 0.406" ID x 0.734" OD ASME B18.21.1 ASME Washers

Key Features & Benefits at a Glance

• Exceptional Load Distribution - The 0.734" outer diameter provides a wide bearing surface, effectively preventing surface damage and joint loosening under high stress.
• Superior Corrosion Resistance - The zinc-plated steel construction offers reliable protection against rust and corrosion, extending the washer's service life in demanding environments.
• High-Strength Durability - As a Grade 8 component with a Rockwell C38 hardness, this washer maintains its integrity and prevents deformation under extreme tensile loads.
• Precision Fit for 3/8" Fasteners - The 0.406" inner diameter ensures a perfect, secure fit on 3/8" screws and bolts, reducing installation time and improving assembly reliability.
• Guaranteed Interchangeability - Manufactured to ASME B18.21.1 standards, ensuring consistent dimensions and performance for reliable replacement and inventory management.
• Regulatory Compliance - Meets RoHS 3 and REACH environmental directives, making it suitable for use in regulated industries and global supply chains.
• Consistent Quality - The controlled thickness range of 0.056-0.071" provides uniform performance and predictable clamping force in every application.

Professional Applications & Engineering Value

This Grade 8 zinc-plated steel flat washer is engineered to solve critical challenges in heavy-duty industrial applications where vibration, high loads, and environmental factors compromise joint integrity. The zinc plating provides a sacrificial layer that actively fights corrosion, making it ideal for outdoor machinery, construction equipment, and automotive assemblies exposed to harsh conditions. Its high-strength Grade 8 classification and Rockwell C38 hardness ensure it won't deform or fail under the extreme pressures typical in structural steel connections, heavy machinery bolting, and high-torque applications. The precise 3/8" size with specific ID/OD dimensions guarantees optimal load distribution, preventing bolt head embedment and protecting expensive components from damage. Manufactured to ASME B18.21.1 specifications, these flat washers deliver predictable performance and reliable interchangeability, reducing maintenance downtime and replacement costs in professional engineering environments.

Specification Summary & Compliance

This flat washer features inch system dimensions with 0.406" inner diameter, 0.734" outer diameter, and thickness ranging from 0.056" to 0.071". It is manufactured from zinc-plated steel with Rockwell C38 hardness and meets Grade 8 strength requirements. The product conforms to ASME B18.21.1 standard specifications for dimensional accuracy and performance. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations is verified, ensuring environmental safety and regulatory acceptance for industrial use worldwide.