S-90299A586 5/16"-18 x 1 1/2" ASME B18.3, ASTM A574 Brass-Tip Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Precision Thread Fit: Class 3A thread fit ensures reliable, vibration-resistant fastening in demanding industrial environments.
• Exceptional Strength: 180,000 psi tensile strength and Rockwell C39 hardness provide superior load-bearing capacity and durability.
• Surface Protection: Nonmarring brass tip prevents scratches and damage to sensitive surfaces during installation and use.
• Corrosion Resistance: Black-oxide coating on alloy steel enhances corrosion resistance for extended service life.
• Easy Installation: Hex socket drive allows for high-torque application with standard tools, reducing assembly time.
• Wide Compatibility: 5/16"-18 UNC coarse thread and right-hand design ensure compatibility with common industrial components.
• Regulatory Compliance: Meets ASME B18.3 specifications and is RoHS 3 & REACH compliant for global use.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address critical fastening challenges in precision machinery, automotive assemblies, and electronic enclosures. The fully threaded UNC coarse thread design provides maximum grip strength and resistance to loosening under dynamic loads, while the nonmarring brass tip eliminates surface damage on finished components—ideal for applications where aesthetics and material integrity are paramount. With its 180,000 psi tensile strength and Rockwell C39 hardness, it delivers reliable performance in high-stress environments, reducing the risk of fastener failure and maintenance downtime. The hex socket drive facilitates secure installation in confined spaces, making it a versatile solution for OEM and MRO professionals seeking durability and precision.

Specification Summary & Compliance

This socket head cap screw features a 5/16"-18 UNC thread with Class 3A fit for precise engagement, a 1-1/2" length, and a fully threaded right-hand coarse thread design. It complies with ASME B18.3 manufacturing standards and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring adherence to international safety and environmental regulations. The black-oxide surface treatment on alloy steel provides additional corrosion resistance, meeting industry requirements for durable and reliable fastening solutions.