S-91201A036 0.781" ID x 1.5" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior Load Distribution - The 1.5" OD and precise 0.781" ID work together to evenly spread clamp load, preventing surface damage and joint failure.
• Exceptional Durability - Made from high-strength steel with a Rockwell B84 hardness rating, this washer resists deformation under heavy loads and repeated use.
• Precision Fit for 3/4" Screws - The accurately sized inner diameter ensures a perfect fit, reducing installation time and preventing assembly errors.
• Consistent Performance - A tightly controlled thickness of 0.245-0.255" guarantees reliable performance and uniform pressure in every application.
• Compliance for Global Markets - Meets RoHS 3 and REACH standards, ensuring your assemblies are compliant for use in regulated industries and international trade.
• Corrosion Resistance - The steel construction provides inherent resistance to environmental factors, extending the service life of your assemblies.
• Versatile Inch-System Compatibility - Designed for the inch system, this flat washer integrates seamlessly with a wide range of standard industrial components.

Professional Applications & Engineering Value

This steel flat washer is engineered to solve critical challenges in industrial applications where vibration, high clamp loads, and material fatigue are common. The high-strength steel and Rockwell B84 hardness provide a robust barrier against embedding and loosening, which is vital for maintaining bolt preload in heavy machinery, structural steel connections, and automotive assemblies. Its precise 0.781" ID ensures a perfect fit for 3/4" screw size fasteners, eliminating play and misalignment that can lead to premature failure. The large 1.5" OD effectively distributes pressure over a wider area, protecting soft materials and painted surfaces from damage. This combination of material strength and dimensional accuracy delivers long-term reliability, reducing maintenance downtime and replacement costs in demanding mechanical and construction environments.

Specification Summary & Compliance

This flat washer conforms to standard inch-system dimensional tolerances for a precise fit. It is manufactured from steel to provide consistent performance and is compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as an alloying element in steel, and is fully REACH (EC 1907/2006) compliant with the latest SVHC list as of 01/17/2023.