S-90044A299 1/4"-20 x 8 1/2" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide finish extends service life in harsh industrial environments, minimizing maintenance needs.
• Precise Class 3A thread fit with UNC coarse threading provides secure, vibration-resistant connections for improved assembly integrity.
• High hardness rating (Rockwell C37) enhances wear resistance, maintaining dimensional stability and thread integrity over repeated use.
• Partially threaded design allows for controlled clamping force and easier alignment in applications requiring specific grip lengths.
• Hex socket drive (3/16") enables high-torque installation with standard tools, facilitating efficient assembly and disassembly.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety for global industrial supply chains.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address critical challenges in heavy-duty machinery, automotive, and construction applications. The UNC coarse thread with Class 3A fit ensures rapid assembly and robust holding power, reducing installation time while resisting loosening under dynamic loads. The alloy steel construction combined with a black-oxide surface treatment provides excellent resistance to rust and abrasion, making it ideal for environments exposed to moisture, chemicals, or frequent mechanical stress. With a tensile strength of 170,000 psi and Rockwell C37 hardness, it delivers consistent performance in high-vibration settings, ensuring long-term reliability and reducing downtime for maintenance. The partially threaded configuration offers flexibility in clamping applications, providing engineers with a versatile solution for precise joint control.

Specification Summary & Compliance

This screw features precise thread dimensions (1/4"-20 UNC) with a Class 3A thread fit for tight tolerances and secure fastening. It meets ASTM A574 specifications for high-strength socket head cap screws, ensuring consistent material and mechanical properties. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms adherence to environmental and safety standards, supporting use in regulated industries worldwide.