S-90271A544 1/4"-20 x 1 1/4" ASME B18.6.3 Steel Truss Head Slotted Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with zinc-plated steel construction for long-lasting performance in demanding environments
• Superior load distribution from the wide truss head design, minimizing surface damage and material stress
• High tensile strength of 60,000 psi ensures reliable fastening in heavy-duty industrial applications
• Easy manual installation with slotted drive design, providing quick assembly without specialized tools
• Precision threading with Class 2A fit delivers consistent engagement and vibration resistance
• Full threading along the entire 1-1/4" length offers maximum grip and adjustment flexibility
• Rockwell B69 hardness rating maintains structural integrity under repeated stress and load conditions

Professional Applications & Engineering Value

Engineered for industrial assembly and heavy equipment manufacturing, this zinc-plated steel truss head screw addresses critical fastening challenges. The UNC coarse thread design prevents cross-threading during high-volume production while maintaining Class 2A precision for consistent performance. The wide truss head distributes clamping force effectively across softer materials, preventing surface deformation in electrical enclosures, machinery panels, and structural frameworks. With full threading and 60,000 psi tensile strength, it ensures secure connections in vibration-prone environments where fastener integrity is paramount.

Specification Summary & Compliance

Manufactured to ASME B18.6.3 specifications with Class 2A thread fit and UNC coarse thread profile. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. Features 1/4"-20 thread size, 1-1/4" length, and right-hand thread direction with complete threading coverage.