S-92220A187 1/4"-20 x 1 1/2" ASTM A574 Alloy Steel Low-Profile Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in harsh industrial environments.
• Exceptional tensile strength of 140,000 psi ensures reliable performance under high-stress applications without failure.
• Precise Class 3A thread fit guarantees secure, vibration-resistant fastening with minimal risk of loosening.
• Low-profile socket head design allows for installation in tight spaces while maintaining easy access with a standard hex key.
• Partially threaded shank provides optimal grip and alignment, reducing the risk of cross-threading during assembly.
• High hardness (Rockwell C39) enhances wear resistance, maintaining thread integrity through repeated use.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material reliability and environmental safety for global supply chains.

Professional Applications & Engineering Value

This 1/4"-20 UNC low profile socket head cap screw is engineered from black-oxide alloy steel to address critical challenges in precision assembly and machinery. The coarse UNC thread and Class 3A fit provide rapid, secure fastening in applications like automotive frames, industrial equipment, and aerospace components, where vibration resistance and dimensional accuracy are paramount. The low-profile head minimizes protrusion, ideal for compact designs without compromising strength. With a Rockwell C39 hardness and 140,000 psi tensile strength, it withstands heavy loads and repetitive stress, reducing maintenance downtime. The partially threaded design ensures precise clamping force distribution, preventing joint failure in dynamic environments. Fully compliant with ASTM A574, it meets rigorous industry standards for reliability and performance in demanding engineering projects.

Specification Summary & Compliance

This fastener adheres to Class 3A thread fit for high precision in the inch system, with UNC coarse threads and a minimum thread length of 1 inch. It meets ASTM A574 specifications for alloy steel socket head cap screws, ensuring consistent manufacturing quality. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in restricted substance-sensitive applications.