S-90276A553 1/4"-20 x 2 3/4" ASME B18.6.3 Steel Round Head Slotted Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with zinc-plated steel construction for longer service life in harsh industrial environments
• Superior load-bearing capacity with 60,000 psi tensile strength and Rockwell B69 hardness for reliable performance under stress
• Optimized thread engagement with Class 2A UNC coarse threads ensuring secure fastening and vibration resistance
• Easy installation and removal with standard slotted drive design compatible with common hand tools
• Versatile partial threading allowing precise clamping force control across various material thicknesses
• Regulatory compliance assurance meeting ASME B18.6.3 specifications for consistent quality and dimensional accuracy
• Environmental responsibility with RoHS 3 and REACH compliance for safe use in regulated industries

Professional Applications & Engineering Value

These zinc-plated steel rounded head screws deliver exceptional engineering value through their balanced combination of corrosion protection and mechanical strength. The 1/4"-20 UNC coarse thread configuration provides excellent grip in soft materials and prevents cross-threading during assembly, while the partial threading design allows for precise adjustment in applications where full thread engagement isn't required. The rounded head profile with slotted drive offers a clean aesthetic finish while maintaining tool compatibility. These characteristics make them ideal for industrial machinery, electrical enclosures, and equipment manufacturing where vibration resistance and long-term reliability are critical. The zinc plating creates a sacrificial layer that significantly extends service life in moderately corrosive environments, reducing maintenance frequency and replacement costs.

Specification Summary & Compliance

This fastener maintains Class 2A thread fit tolerances per UNC standards with precise 1/4"-20 coarse threading and 2 3/4" overall length. Manufacturing complies with ASME B18.6.3 specifications for dimensional consistency and performance reliability. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations for chemical safety, ensuring suitability for global industrial applications and environmentally conscious operations.