S-91860A029 0.312" ID x 0.75" OD General Purpose Washers

Key Features & Benefits at a Glance

• Exceptional corrosion resistance from 17-7 PH stainless steel, ideal for harsh industrial environments and extending service life.
• Superior strength and durability with a Rockwell C40 hardness, providing reliable load distribution and resistance to deformation under stress.
• Precise dimensional fit with a 0.312" inner diameter designed specifically for 1/4" screws, ensuring secure fastening and reducing assembly errors.
• Optimized load-bearing surface thanks to the 0.75" outer diameter, which helps prevent surface damage and loosening from vibration.
• Consistent performance and thickness between 0.058" and 0.068", guaranteeing uniform pressure distribution in critical applications.
• Full regulatory compliance with RoHS 3 and REACH, making these washers safe for use in regulated industries and global supply chains.
• Long-term reliability in inch-system applications, manufactured to precise standards for seamless integration with existing equipment and components.

Professional Applications & Engineering Value

Engineered for demanding environments, these 17-7 PH stainless steel flat washers address common industrial challenges like corrosion, vibration-induced loosening, and material fatigue. The precipitation-hardening stainless steel construction offers high strength and excellent resistance to oxidation and chemical exposure, making them ideal for aerospace, chemical processing, and marine applications. The precise 0.312" ID ensures a perfect fit for 1/4" screws, minimizing play and maintaining clamp load. Combined with the generous 0.75" OD, these washers effectively distribute pressure, protect surfaces from galling, and enhance the longevity of assembled structures, reducing maintenance frequency and downtime in heavy-duty industrial systems.

Specification Summary & Compliance

This flat washer is manufactured to precise inch-system dimensions: Inner Diameter of 0.312", Outer Diameter of 0.75", and Thickness ranging from 0.058" to 0.068". It is designed for use with 1/4" screw sizes and features a Rockwell C40 hardness for consistent mechanical performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety standards for industrial components.