S-90271A554 1/4"-20 x 3" ASME B18.6.3 Steel Truss Head Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
• Enhanced load distribution through wide truss head design that reduces surface pressure and prevents material damage
• High tensile strength rating of 60,000 psi ensures reliable performance under heavy loads and vibration
• Optimized thread engagement with Class 2A fit and coarse UNC threading for faster installation and secure fastening
• Excellent driving compatibility with slotted drive style accommodating standard tools for versatile applications
• Full threading along 3-inch length provides maximum grip and adjustment flexibility throughout the entire fastener
• Industry compliance assurance meeting ASME B18.6.3 standards and environmental regulations for quality and safety

Professional Applications & Engineering Value

These zinc-plated steel truss head screws deliver exceptional engineering value across industrial and construction applications where vibration resistance and structural integrity are paramount. The wide truss head design significantly increases bearing surface area, effectively distributing clamping force to prevent material crushing in softer substrates or sheet metal assemblies. With 60,000 psi tensile strength and Rockwell B69 hardness, these fasteners maintain their mechanical properties under sustained loads, making them ideal for heavy-duty equipment, machinery frames, and structural connections. The coarse UNC 1/4-20 threading ensures rapid installation while providing reliable holding power, particularly in wood, plastic, or softer metals where fine threads might strip. The combination of full threading and slotted drive offers installation versatility across maintenance, manufacturing, and assembly operations.

Specification Summary & Compliance

This 1/4-20 x 3" truss head screw features precision Class 2A thread fit with UNC coarse threading and right-hand thread direction, manufactured to exacting dimensional standards. The fastener complies with ASME B18.6.3 specifications for dimensional requirements and mechanical properties. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring restricted substance compliance for international industrial applications. The inch system measurement provides compatibility with North American equipment and standards.