S-91440A540 1/4"-20 x 3/4" ASME B18.6.3 Steel Round Head Combination Phillips/Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
• High-load bearing capability with 60,000 psi tensile strength and Rockwell B70 hardness for reliable performance under stress
• Versatile installation options with combined Phillips/Slotted No. 3 drive for flexible tool compatibility
• Secure fastening performance through full UNC coarse threading and Class 2A thread fit ensuring consistent engagement
• Optimized head design with rounded profile providing improved aesthetics and reduced snagging risks
• Regulatory compliance assurance meeting ASME B18.6.3 standards and environmental regulations for global applications
• Time-saving installation with right-hand coarse threading enabling quick assembly in various materials

Professional Applications & Engineering Value

This zinc-plated steel rounded head screw delivers exceptional engineering value across industrial applications where corrosion resistance and structural integrity are paramount. The combination of 60,000 psi tensile strength and Rockwell B70 hardness ensures reliable performance in heavy-duty assemblies, from machinery frames to equipment enclosures. The fully threaded UNC coarse thread design provides maximum grip strength in wood, metal, and composite materials, while the Phillips/Slotted drive offers installation flexibility for both production lines and maintenance scenarios. The zinc plating creates a protective barrier against oxidation, significantly extending service life in humid or outdoor environments. These industrial screws are engineered to withstand vibration and dynamic loads, making them ideal for manufacturing equipment, automotive components, and structural applications requiring durable fastening solutions.

Specification Summary & Compliance

This 1/4"-20 x 3/4" rounded head screw features precision UNC coarse threading with Class 2A thread fit for consistent engagement and reliable fastening performance. Manufactured to ASME B18.6.3 specifications, it ensures dimensional accuracy and interchangeability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial applications where regulatory adherence is mandatory.