S-90299A583 5/16"-18 x 1" ASME B18.3, ASTM A574 Brass-Tip Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Non-marring brass tip prevents damage to sensitive surfaces during installation and removal
• Exceptional 180,000 psi tensile strength delivers reliable performance in high-stress industrial applications
• Rockwell C39 hardness provides superior wear resistance and long-term durability
• Black-oxide finish on alloy steel offers enhanced corrosion resistance for extended service life
• Precise Class 3A thread fit ensures smooth assembly and secure, vibration-resistant fastening
• Standard 1/4" hex drive allows for easy installation with common tools in confined spaces
• Full thread engagement along the 1" length provides maximum grip and load distribution

Professional Applications & Engineering Value

This socket head cap screw is engineered to solve critical fastening challenges in demanding environments. The black-oxide alloy steel construction combined with Rockwell C39 hardness provides the structural integrity needed for heavy machinery, automotive assemblies, and precision equipment where failure is not an option. The 5/16"-18 UNC coarse thread and Class 3A fit ensure rapid installation and reliable performance even in high-vibration applications. Most notably, the integrated non-marring brass tip protects finished surfaces and delicate components from scratches and deformation during assembly and maintenance, making it ideal for applications in aerospace, electronics, and precision manufacturing where surface preservation is paramount.

Specification Summary & Compliance

This socket head cap screw features precise inch system dimensions including a 1" length and 5/16"-18 UNC coarse thread with Class 3A thread fit for superior engagement. Manufactured to meet ASME B18.3 specifications and constructed from ASTM A574 alloy steel. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets.