S-90474A142 0.531" ID x 1.25" OD ASME Washers

Key Features & Benefits at a Glance

• Enhanced Corrosion Resistance: Black-oxide steel surface treatment provides reliable protection against rust and environmental degradation, extending service life in demanding conditions.
• Superior Load Distribution: With a 1.25" outer diameter and 0.080-0.115" thickness, this washer effectively spreads clamping force, preventing surface damage and joint loosening.
• Precision Fit for 1/2" Fasteners: 0.531" inner diameter ensures accurate alignment and secure seating on 1/2" screws, reducing installation errors and improving assembly efficiency.
• Durable Material Strength: Rockwell B80 hardness offers excellent mechanical durability, resisting deformation under high-stress industrial applications.
• Regulatory Compliance Assurance: Meets RoHS 3 and REACH standards, ensuring safe use in global markets without hazardous substance restrictions.
• Versatile Inch System Compatibility: Designed for imperial measurement systems, seamlessly integrating with existing North American machinery and component inventories.
• Cost-Effective Maintenance: Long-lasting performance reduces replacement frequency and downtime, lowering total ownership costs for heavy-duty operations.

Professional Applications & Engineering Value

Engineered for industrial-grade assemblies, this black-oxide steel flat washer addresses critical challenges in machinery, construction, and automotive sectors. The corrosion-resistant coating combats moisture and chemical exposure, preventing fastener failure in harsh environments. Its precise 0.531" ID and 1.25" OD dimensions ensure optimal load distribution, minimizing stress concentrations on connected surfaces—a key solution for high-vibration applications where joint integrity is paramount. Combined with Rockwell B80 hardness, it maintains dimensional stability under repetitive loads, making it ideal for heavy-duty washers requirements in structural bolting, equipment frames, and powertrain components. This flat washer delivers consistent performance, reducing maintenance intervals and enhancing operational reliability.

Specification Summary & Compliance

This flat washer adheres to inch system standards with an inner diameter of 0.531", outer diameter of 1.25", and thickness range of 0.080-0.115", designed specifically for 1/2" screw size applications. Manufactured from black-oxide steel with a Rockwell B80 hardness rating, it ensures mechanical robustness and dimensional accuracy. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted substances for safe industrial use worldwide.