S-90117A121 6-32 x 3/8" ASME B18.3 Alloy Steel Wire-Lockable Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 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 connections in demanding environments.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance and durability, extending service life in harsh industrial conditions.
• Hex socket drive (7/64") allows for high-torque installation with standard tools, minimizing stripping and improving assembly efficiency.
• Fully threaded 6-32 UNC coarse design ensures maximum grip and holding power across the entire length for consistent fastening.
• Rockwell C37 hardness delivers excellent wear resistance, maintaining thread integrity through repeated use and adjustments.
• Compliance with ASME B18.3, RoHS 3, and REACH guarantees adherence to industry standards and environmental regulations for safe, global use.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in precision assembly and heavy-duty applications. The 6-32 UNC coarse thread with Class 3A fit ensures minimal backlash and reliable clamping force, preventing loosening under vibration in machinery, automotive, and aerospace components. The fully threaded design provides uniform load distribution, reducing stress concentration points. Combined with a 170,000 psi tensile strength and Rockwell C37 hardness, it withstands extreme operational demands while the black-oxide surface treatment resists rust and wear, making it ideal for environments exposed to moisture, chemicals, or frequent disassembly. Its hex drive facilitates secure installation in confined spaces, enhancing productivity in automated or manual fastening processes.

Specification Summary & Compliance

This socket head cap screw features a 6-32 UNC thread with Class 3A precision fit and coarse spacing, ensuring exact dimensional accuracy per ASME B18.3 specifications. The 3/8" length and fully threaded rod type provide consistent performance. It is manufactured from alloy steel with a black-oxide finish and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for restricted substance-free industrial and commercial use.