S-90044A219 2"-4 1/2 x 8" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
• Superior hardness rating of Rockwell C37 provides excellent wear resistance and durability for extended service life in demanding environments.
• Black-oxide finish on alloy steel offers enhanced corrosion resistance, protecting the screw from rust and degradation in harsh conditions.
• 1 1/2" hex drive and standard socket head profile allow for secure, high-torque installation with common tools, minimizing slippage and installation time.
• Class 2A thread fit with UNC coarse threading ensures easy assembly and reliable engagement, even in applications with slight misalignments or debris.
• Partially threaded design provides unthreaded shank for precise clamping and shear strength where full threading isn't required.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety, meeting strict industrial and regulatory standards.

Professional Applications & Engineering Value

These socket head cap screws are engineered to solve critical challenges in heavy machinery, construction, and manufacturing sectors where joint integrity is paramount. The black-oxide alloy steel construction, combined with a Rockwell C37 hardness, resists deformation under extreme loads, while the UNC coarse thread and Class 2A fit facilitate quick, secure fastening in high-vibration environments. Ideal for use in equipment frames, structural assemblies, and industrial fixtures, these screws prevent loosening and maintain clamp force, reducing maintenance downtime. The partially threaded rod design offers optimized stress distribution, making them suitable for applications requiring precise alignment and shear resistance without compromising tensile strength.

Specification Summary & Compliance

This product adheres to precise dimensional standards, including Class 2A thread fit and UNC coarse thread specifications, ensuring consistent performance and interchangeability. Manufactured in compliance with ASTM A574 for material and mechanical properties, it also meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial use without hazardous substances.