S-90339A039 Easy-Install Slotted Washers

Key Features & Benefits at a Glance

• Enhanced Durability - Black-oxide steel construction provides superior corrosion resistance, extending service life in harsh industrial environments
• Precision Fit - Specifically designed with 21/32" slot width and 1 3/8" slot depth for perfect compatibility with 5/8" screws
• Exceptional Strength - Rockwell 15N80 hardness rating ensures maximum load-bearing capacity and resistance to deformation under pressure
• Optimal Load Distribution - 2.125" outer diameter and 0.365-0.385" thickness provide superior surface coverage for even pressure distribution
• Reliable Performance - Inch system measurement ensures precise dimensional accuracy and consistent fit in standard applications
• Environmental Compliance - Meets RoHS 3 and REACH regulations, making them suitable for regulated industries and international markets
• Reduced Maintenance - Heavy-duty construction minimizes wear and tear, lowering long-term replacement costs

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these black-oxide steel slotted washers deliver critical performance advantages in heavy machinery, construction equipment, and automotive assemblies. The Rockwell 15N80 hardness ensures exceptional resistance to deformation under extreme loads, while the precise slot dimensions (21/32" width, 1 3/8" depth) guarantee secure fastening with 5/8" screws. The black-oxide surface treatment provides superior corrosion protection in environments exposed to moisture, chemicals, and temperature variations. These heavy-duty washers effectively prevent loosening, distribute bearing loads evenly, and maintain joint integrity in high-vibration applications, making them ideal for structural connections, equipment mounting, and industrial maintenance where reliability is paramount.

Specification Summary & Compliance

This slotted washer features precise inch system dimensions including 2.125" OD, 0.365-0.385" thickness, 21/32" slot width, and 1 3/8" slot depth, engineered for Class 2A thread compatibility with 5/8" screws. Manufactured to industrial standards with Rockwell 15N80 hardness certification. Fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as an alloying element in steel and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and global market acceptance.