S-90279A562 1/4"-28 x 3/4" ASME B18.6.3 Steel Round Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
• High tensile strength of 60,000 psi ensures reliable performance under heavy loads and vibration
• Precision UNF fine threading (Class 2A) provides superior engagement and vibration resistance in critical assemblies
• Rockwell B69 hardness rating delivers excellent durability and resistance to wear during installation
• Full threading design allows maximum grip length and uniform stress distribution
• Phillips No. 3 drive system enables efficient installation with standard industrial tools
• Rounded head profile offers a finished appearance while preventing snagging in assembled applications

Professional Applications & Engineering Value

This zinc-plated steel rounded head screw delivers exceptional engineering value in industrial applications where corrosion resistance and vibration tolerance are critical. The UNF fine thread configuration provides superior holding power in materials prone to stress cracking, while the Class 2A thread fit ensures consistent engagement without binding. The combination of 60,000 psi tensile strength and Rockwell B69 hardness makes these Phillips drive screws ideal for machinery assembly, electrical enclosures, and automotive components where reliable fastening under dynamic loads is essential. The fully threaded design maximizes connection integrity across the entire fastener length.

Specification Summary & Compliance

This 1/4"-28 x 3/4" rounded head screw features precision Class 2A thread fit according to UNF fine thread standards. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and performance. The product is fully RoHS 3 (2015/863/EU) compliant and meets REACH (EC 1907/2006) requirements for environmental safety and substance restrictions.