S-90276A554 1/4"-20 x 3" ASME B18.6.3 Steel Round Head Slotted Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with zinc-plated steel construction for reliable performance in demanding industrial environments
• Superior mechanical strength with 60,000 psi tensile strength and Rockwell B69 hardness to withstand heavy loads and vibration
• Optimized thread engagement with UNC coarse threading and Class 2A fit for faster assembly and secure fastening
• Versatile partial threading design allowing for precise clamping force control across various material thicknesses
• Simplified installation and removal with standard slotted drive compatible with common hand tools
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
• Dimensional consistency with precise 3" length and standardized rounded head profile for uniform performance in repetitive applications

Professional Applications & Engineering Value

These zinc-plated steel rounded head screws deliver exceptional engineering value in industrial fastening applications where corrosion resistance and mechanical reliability are critical. The UNC coarse threading with Class 2A fit ensures rapid installation while maintaining secure connections in materials prone to vibration and thermal cycling. The partially threaded design provides controlled clamping force, making these slotted drive screws ideal for machinery assembly, equipment manufacturing, and structural applications requiring precise joint integrity. The combination of 60,000 psi tensile strength and Rockwell B69 hardness guarantees long-term performance in high-stress environments, while the rounded head profile distributes bearing pressure evenly to prevent surface damage. These industrial-grade fasteners solve common challenges of fastener failure, corrosion-induced degradation, and installation inefficiency across manufacturing, construction, and maintenance operations.

Specification Summary & Compliance

This 1/4-20 UNC screw features precise dimensional control with Class 2A thread fit per industry standards, ensuring consistent performance and interchangeability. The manufacturing process adheres to ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. Environmental compliance is verified through RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) compliance, confirming the absence of restricted substances. The 3" length with partial threading (minimum 1½" thread length) provides versatile application coverage while maintaining structural integrity across the fastener's entire shank.