S-90117A270 1/2"-20 x 1 1/4" 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 under high-stress conditions, reducing failure risks in demanding applications.
• Precise Class 3A thread fit provides superior engagement and vibration resistance, maintaining secure fastening in critical assemblies.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance and durability, extending service life in harsh industrial environments.
• 3/8" hex drive with standard socket head allows for easy installation and high torque application, improving assembly efficiency and reducing tool wear.
• Fine thread spacing and fully threaded design deliver consistent clamping force and superior load distribution, minimizing loosening in dynamic applications.
• Compliance with ASME B18.3 standards guarantees dimensional accuracy and interchangeability, ensuring compatibility with existing industrial systems.
• RoHS 3 and REACH compliance meets environmental regulations, supporting sustainable and safe manufacturing practices.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges such as vibration-induced loosening and corrosion in machinery, automotive, and heavy equipment applications. The Class 3A UNF fine threads provide a tight, secure fit that resists back-off under dynamic loads, while the fully threaded rod design ensures uniform stress distribution across the entire length. With a Rockwell C37 hardness and high tensile strength, it withstands extreme forces without deformation, making it ideal for critical joints in assembly lines, structural frameworks, and precision instruments. The black-oxide surface treatment adds a protective layer that reduces maintenance needs, enhancing longevity in humid or abrasive settings. Its 3/8" hex drive simplifies installation in confined spaces, boosting productivity for B2B users in manufacturing and repair sectors.

Specification Summary & Compliance

This socket head cap screw adheres to ASME B18.3 specifications, ensuring precise dimensions including a 1/2"-20 UNF thread size with Class 3A fit for high accuracy and fine thread spacing. It is manufactured from alloy steel with a tensile strength of 170,000 psi and hardness of Rockwell C37, supporting reliable performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for industrial use without hazardous substances.