S-91090A115 0.406" ID x 1.5" OD Oversized Washers

Key Features & Benefits at a Glance

• Enhanced Corrosion Resistance: Zinc-plated steel construction provides reliable protection against rust and environmental degradation, extending service life in demanding conditions.
• Optimal Load Distribution: Large 1.5" outer diameter combined with precise 0.406" inner diameter ensures even pressure spread, preventing surface damage and joint loosening.
• Precision Fit for 3/8" Screws: Accurate inner diameter guarantees secure fastening without slippage, maintaining assembly integrity under vibration and load.
• Consistent Thickness Control: 0.042-0.051" thickness range ensures uniform performance and reliable gap filling in various industrial applications.
• Environmental Compliance: Meets RoHS 3 and REACH standards, ensuring safe use in regulated industries and global market acceptance.
• Durable Material Strength: Steel core with zinc plating offers excellent mechanical durability for long-term performance in heavy-duty assemblies.
• Standard Inch Sizing: Manufactured to standard inch measurements for seamless compatibility with existing 3/8" screw systems and tooling.

Professional Applications & Engineering Value

These zinc-plated steel flat washers are engineered to solve critical industrial fastening challenges, particularly in applications requiring corrosion resistance and reliable load distribution. The zinc plating acts as a sacrificial layer, protecting the underlying steel from oxidation in humid or chemically aggressive environments, which is vital for outdoor equipment, automotive assemblies, and machinery exposed to moisture. The precise 0.406" ID ensures a snug fit on 3/8" screws, minimizing movement and maintaining clamp force under dynamic loads. With a 1.5" OD, these washers effectively disperse pressure over a wider area, preventing surface indentation on soft materials and reducing stress concentration in bolted joints. This combination of material and dimensional precision delivers enhanced assembly longevity and reduced maintenance needs across construction, manufacturing, and MRO sectors.

Specification Summary & Compliance

This flat washer features an inner diameter of 0.406", outer diameter of 1.5", and thickness ranging from 0.042" to 0.051", designed specifically for use with 3/8" screw size in inch-based systems. Manufactured from zinc-plated steel, it provides consistent dimensional accuracy suitable for standard industrial applications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards for hazardous substances. This compliance supports use in regulated industries and global supply chains requiring certified components.