S-90401A190 8-32 x 1/4" Hex Head Screws with Lock Washer

Key Features & Benefits at a Glance

• Superior vibration resistance thanks to the integrated external-tooth lock washer that prevents loosening under dynamic loads
• Enhanced corrosion protection with zinc-plated steel construction, ensuring longevity in demanding industrial environments
• High-strength performance with 60,000 psi tensile strength and Rockwell B70 hardness for reliable load-bearing capacity
• Easy installation and removal with standard external hex head design compatible with common wrenches
• Optimal thread engagement through fully threaded UNC coarse thread design for faster assembly and secure fastening
• Precise thread compatibility with Class 2A thread fit ensuring consistent performance in standard applications
• Regulatory compliance assurance meeting RoHS 3 standards for environmentally conscious manufacturing

Professional Applications & Engineering Value

Engineered for industrial fastening applications where vibration resistance and durability are critical, these zinc-plated steel hex head screws deliver exceptional performance. The external-tooth lock washer provides permanent locking action that eliminates the need for additional locking components, solving common loosening issues in machinery, automotive assemblies, and electrical enclosures. The UNC coarse thread design ensures quick installation and reliable holding power in various materials, while the fully threaded configuration maximizes connection strength. With 60,000 psi tensile strength and corrosion-resistant zinc plating, these screws maintain integrity in harsh operating conditions, making them ideal for manufacturing equipment, structural frameworks, and maintenance applications requiring dependable, long-lasting fastening solutions.

Specification Summary & Compliance

This 8-32 UNC hex head screw features precise Class 2A thread fit tolerance for consistent performance in inch system applications. Manufactured from zinc-plated steel with Rockwell B70 hardness and 60,000 psi tensile strength, it includes an integrated external-tooth lock washer (0.317" OD, 0.023" thickness) for enhanced vibration resistance. The product is fully compliant with RoHS 3 (2015/863/EU) regulations, ensuring environmental safety standards are met for industrial use.