S-91201A030 0.344" ID x 0.75" OD Oversized Washers

Key Features & Benefits at a Glance

• Enhanced Load Distribution – The 0.75" outer diameter provides a wider bearing surface, reducing surface pressure and preventing damage to assembled materials.
• Superior Material Strength – Made from durable steel with a Rockwell B84 hardness, this washer resists deformation under high stress, ensuring long-term reliability.
• Precision Fit for 5/16" Screws – The 0.344" inner diameter offers an exact match for standard 5/16" fasteners, minimizing play and improving assembly accuracy.
• Consistent Thickness Control – With a thickness range of 0.120-0.130", it guarantees uniform clamping force and vibration resistance in demanding applications.
• Compliance with Global Standards – Meets RoHS 3 and REACH regulations, ensuring safe use in regulated industries without hazardous substances.
• Corrosion and Wear Resistance – The steel construction and hardness rating provide excellent durability against environmental factors and mechanical wear.
• Versatile Inch System Compatibility – Designed for inch-based assemblies, it seamlessly integrates with existing industrial equipment and standards.

Professional Applications & Engineering Value

This heavy-duty flat washer is engineered to address common challenges in industrial settings, such as joint loosening and material fatigue. Its steel composition and Rockwell B84 hardness ensure it maintains integrity under repetitive loads and vibrations, making it ideal for construction, machinery, and automotive assemblies. The precise 0.344" ID and 0.75" OD dimensions provide optimal load distribution, preventing bolt head embedment and surface damage. By incorporating a flat washer with strict thickness tolerances, engineers can achieve reliable, long-lasting connections in corrosive or high-stress environments, reducing maintenance costs and downtime.

Specification Summary & Compliance

This flat washer adheres to standard inch measurement tolerances, with an inner diameter of 0.344", outer diameter of 0.75", and thickness between 0.120-0.130" for consistent performance. It is manufactured to fit 5/16" screw sizes and complies with RoHS 3 (2015/863/EU) under exemption 6(a) for lead in steel alloys, as well as REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are met for industrial use.