S-90342A129 1/4"-20 x 1" Alloy Steel Socket Head Screws with Split Lock Washer

Key Features & Benefits at a Glance

• Exceptional tensile strength of 180,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in industrial settings.
• Black-oxide finish on alloy steel offers enhanced corrosion resistance and durability, extending service life in harsh environments.
• Integrated split lock washer prevents loosening under dynamic loads, maintaining clamp force and reducing maintenance needs.
• Hex socket drive design allows for high torque application and easy installation in confined spaces with standard tools.
• Rockwell C39 hardness ensures high wear resistance and dimensional stability under repeated use.
• Full threading enables consistent engagement along the entire length, providing uniform load distribution.

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these black-oxide alloy steel socket head cap screws deliver exceptional reliability in machinery, automotive, and heavy equipment assemblies. The coarse UNC thread and Class 3A fit minimize cross-threading risks while ensuring rapid installation in high-volume production. Combined with the split lock washer, this fastener effectively counters vibration-induced loosening—a common failure point in dynamic systems. The 180,000 psi tensile strength and Rockwell C39 hardness provide robust performance under extreme mechanical stress, making these screws ideal for critical joints where precision and durability are paramount. Their RoHS 3 and REACH compliance further supports use in regulated industries, ensuring environmental and safety standards are met without compromising performance.

Specification Summary & Compliance

This 1/4"-20 UNC socket head cap screw features precise Class 3A thread fit per ANSI/ASME B1.1 standards, with coarse thread spacing for efficient assembly. Manufactured from alloy steel with a black-oxide surface treatment for corrosion protection, it includes a matching split lock washer to enhance fastener security. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to international environmental and safety requirements for industrial components.