S-90283A845 1/4"-28 x 1/2" ASME B18.6.3 Steel Pan Head Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding industrial environments
• Enhanced thread engagement through Class 2A fine thread fit, ensuring vibration-resistant assemblies with minimal loosening risk
• High-load capacity with 60,000 psi tensile strength and Rockwell B60 hardness, maintaining structural integrity under stress
• Universal compatibility with standard slotted drivers, enabling quick installation and removal with common tools
• Full-thread design providing maximum grip length and uniform stress distribution across connected components
• Regulatory compliance meeting ASME B18.6.3 specifications while adhering to RoHS 3 and REACH environmental standards
• Optimized head geometry with rounded pan profile distributing clamp load efficiently while preventing surface damage

Professional Applications & Engineering Value

These zinc-plated steel slotted pan head screws deliver exceptional performance in precision assembly applications where corrosion resistance and high tensile strength are critical. The 1/4"-28 UNF fine thread configuration provides superior holding power in thin materials and vibration-prone environments, while the Class 2A thread fit ensures consistent engagement without binding. The rounded head profile minimizes stress concentration points while the slotted drive accommodates both manual and automated installation processes. Ideal for industrial machinery, electronic enclosures, and automotive assemblies, these fully threaded fasteners maintain dimensional stability across thermal cycles and mechanical loads, reducing maintenance frequency and downtime in continuous operation settings.

Specification Summary & Compliance

Manufactured to ASME B18.6.3 standards with Class 2A thread tolerances for precise fitment. The UNF 1/4"-28 fine thread configuration ensures optimal performance in applications requiring fine adjustment and vibration resistance. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations guarantees environmentally responsible manufacturing. The zinc-plated surface treatment provides consistent corrosion protection while maintaining electrical conductivity where required.