S-90044A235 2 1/2"-8 x 4" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under extreme loads and prevents fastener failure in demanding applications.
• Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in harsh industrial environments.
• Precise and secure fastening with fine 2 1/2-8 UN Class 2A threads, offering excellent vibration resistance and reduced risk of loosening.
• High torque capability enabled by the 1 3/4" hex drive and standard socket head profile, allowing for easy installation and removal with standard tools.
• Maximum grip and holding power due to the fully threaded design, providing uniform clamping force along the entire 4" length.
• Consistent hardness and durability with a Rockwell C37 rating, ensuring the screw maintains its integrity under repetitive stress.
• Compliance with global standards including ASTM A574, RoHS 3, and REACH, guaranteeing material quality and environmental safety for industrial use.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in heavy machinery, construction, and automotive assembly, where high tensile strength and corrosion resistance are paramount. The fine 2 1/2-8 UN thread and Class 2A fit provide superior vibration resistance, minimizing loosening in dynamic applications. With a fully threaded 4" length and robust 1 3/4" hex drive, it ensures even load distribution and easy installation in tight spaces, reducing assembly time and maintenance costs. Ideal for securing large structural components, this fastener meets ASTM A574 specifications, delivering reliability in high-stress environments while complying with RoHS and REACH for safe industrial use.

Specification Summary & Compliance

This socket head cap screw features precise 2 1/2-8 UN fine threads with a Class 2A fit, ensuring accurate engagement and tolerance. It is manufactured in accordance with ASTM A574 specifications and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for industrial applications without hazardous substances.