S-92327A818 5/16"-18 x 1 1/2" ASME B18.2.1, SAE J429 Square Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 120,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh environments
• Precise thread engagement with Class 3A fit UNC coarse threading ensuring secure fastening and vibration resistance
• Enhanced durability through Rockwell C25 hardness, maintaining structural integrity under repeated stress
• Optimized drive efficiency with external square head design for superior torque transmission and installation control
• Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed quality and interchangeability
• Full-threaded design providing maximum grip length and uniform stress distribution across the entire fastener

Professional Applications & Engineering Value

This heavy-duty square head screw delivers exceptional engineering value for industrial machinery, construction equipment, and structural assemblies where vibration resistance and reliable clamping force are critical. The SAE Grade 5 steel construction combined with Rockwell C25 hardness ensures the fastener maintains its mechanical properties under continuous operational stress. The zinc yellow-chromate plating provides superior protection against corrosion in outdoor or chemically aggressive environments, while the UNC coarse threading with Class 3A fit enables quick installation and secure fastening even in applications subject to vibration loosening. The external square drive design allows for high-torque application without cam-out, making it ideal for heavy machinery maintenance, agricultural equipment, and industrial fabrication where access space may be limited but maximum clamping force is required.

Specification Summary & Compliance

This square head screw features precision 5/16"-18 UNC coarse threading with Class 3A thread fit according to unified standard specifications. The fastener is manufactured to meet ASME B18.2.1 dimensional requirements and SAE J429 material standards, ensuring dimensional accuracy and mechanical performance consistency. The 1 1/2" length and fully threaded design provide optimal engagement for various material thicknesses. Compliance with industry standards guarantees interchangeability and reliability in industrial applications requiring medium strength fasteners with superior corrosion protection.