S-90474A178 0.125" ID x 0.375" OD ASME B18.21.1 ASME Washers

Key Features & Benefits at a Glance

• Lightweight corrosion resistance from aluminum construction for extended service life in demanding environments
• Precise dimensional fit with 0.125" ID and 0.375" OD ensuring perfect alignment with No. 4 screw sizes
• Consistent load distribution through controlled 0.036-0.045" thickness for reliable joint integrity
• Industry-standard compliance with ASME B18.21.1 specifications guaranteeing interchangeability and quality
• Environmental regulation adherence through RoHS 3 and REACH compliance for global supply chain compatibility
• Non-magnetic properties ideal for electrical and sensitive electronic applications
• Cost-effective performance combining aluminum's durability with precision manufacturing for value-driven assemblies

Professional Applications & Engineering Value

These aluminum flat washers deliver critical engineering solutions where weight reduction, corrosion resistance, and non-conductive properties are paramount. The ASME B18.21.1 compliant design ensures dimensional precision that prevents loosening and distributes clamping forces evenly across fastened joints. Particularly valuable in aerospace components, electronic enclosures, and marine equipment, these washers address common industry pain points including galvanic corrosion, electromagnetic interference, and weight-sensitive assemblies. The 0.125" ID provides secure seating on No. 4 screws while the 0.375" OD offers optimal bearing surface, making them essential for precision mechanical systems requiring reliable, long-term performance without compromising structural integrity.

Specification Summary & Compliance

Manufactured to ASME B18.21.1 standards with dimensional tolerances including 0.125" inner diameter, 0.375" outer diameter, and thickness range of 0.036-0.045". These aluminum flat washers maintain full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and global market acceptance. Designed specifically for use with No. 4 screw sizes in inch measurement systems, these components meet rigorous industrial specifications for precision mechanical applications.