S-98029A036 0.781" ID x 1.625" OD Oversized Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with black-oxide steel surface treatment, ideal for humid or demanding industrial environments
• Superior load distribution for 3/4" screws, reducing stress concentration and preventing joint failure
• Precise dimensional accuracy with 0.781" ID and 1.625" OD ensuring consistent fit and alignment in assembly
• Robust construction with 0.136-0.161" thickness providing reliable support in heavy-duty applications
• Full regulatory compliance with RoHS 3 and REACH standards, ensuring safe use in global markets
• Optimized for inch-system fasteners, simplifying sourcing and compatibility in North American industrial settings
• Extended service life through durable steel material, minimizing replacement frequency and maintenance costs

Professional Applications & Engineering Value

This black-oxide steel flat washer delivers critical engineering solutions by addressing common industrial challenges like corrosion, uneven load distribution, and fastener loosening. The black-oxide coating provides a protective barrier against oxidation and mild chemical exposure, making it suitable for outdoor equipment, machinery assemblies, and automotive applications where moisture is present. Its precise 0.781" ID and 1.625" OD dimensions ensure accurate seating under 3/4" screw heads, distributing clamp load evenly to prevent surface damage and maintain bolt preload. By combining inch-system compatibility with high-strength steel construction, this washer reduces assembly errors and enhances the reliability of mechanical joints in construction, manufacturing, and MRO operations.

Specification Summary & Compliance

This flat washer meets standard inch-system dimensional tolerances with an inner diameter of 0.781", outer diameter of 1.625", and thickness range of 0.136-0.161". Manufactured from black-oxide steel, it is designed for use with 3/4" screws and complies with RoHS 3 (2015/863/EU) under exemption 6(a) for lead in steel alloys, and is REACH (EC 1907/2006) compliant as of January 17, 2023, covering 233 SVHCs. No hardness rating is specified, making it versatile for general-purpose industrial fastening applications.