S-91263A229 5/8"-11 x 1 1/4" ASME B18.3 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with zinc plating, ideal for harsh industrial environments and extending service life.
• Superior tensile strength of 120,000 PSI ensures reliable, high-load fastening for demanding applications.
• Precise Class 3A thread fit guarantees smooth assembly and a secure, vibration-resistant connection.
• High Rockwell C32 hardness provides excellent wear resistance and durability under stress.
• Convenient 3/8" hex drive allows for easy installation and removal with standard tools.
• 82° countersink angle and flat head design enables a flush, low-profile finish for streamlined surfaces.
• Full threading offers maximum grip and holding power along the entire screw length.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these zinc-plated alloy steel flat head screws address critical challenges in machinery, construction, and equipment assembly. The coarse UNC thread and Class 3A fit ensure quick, reliable fastening in materials where vibration loosening is a concern, while the 120,000 PSI tensile strength and Rockwell C32 hardness prevent stripping and shear failure under high stress. The zinc plating provides a robust barrier against corrosion, making these fully threaded screws a dependable choice for outdoor or corrosive environments, enhancing longevity and reducing maintenance needs in structural and mechanical fastening systems.

Specification Summary & Compliance

This screw features a 5/8"-11 UNC coarse thread with a Class 3A thread fit for precise dimensional accuracy. It is manufactured in compliance with ASME B18.3 standards and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulatory requirements, ensuring environmental safety and material quality for global industrial use.