S-90272A106 4-40 x 1/4" ASME B18.6.3 Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in harsh environments
• Enhanced durability and wear resistance from Rockwell B70 hardness, maintaining structural integrity under stress
• Reliable fastening performance with fully threaded UNC coarse threads ensuring maximum grip and vibration resistance
• Precise Class 2A thread fit for smooth installation and consistent engagement in industrial assemblies
• Optimized Phillips No. 1 drive providing secure tool engagement and reducing cam-out during high-torque applications
• Versatile pan head design offering low-profile installation and excellent load distribution across surfaces
• Compliance with major industry standards including ASME B18.6.3, RoHS 3, and REACH for quality assurance and environmental safety

Professional Applications & Engineering Value

These 4-40 UNC zinc-plated steel screws deliver exceptional engineering value through their coarse thread design and rounded pan head profile, specifically engineered to address common industrial fastening challenges. The combination of Rockwell B70 hardness and fully threaded construction ensures reliable performance in vibration-prone applications where loosening resistance is critical. The zinc plating provides essential corrosion protection for electrical enclosures, machinery components, and outdoor equipment exposed to moisture and environmental contaminants. With their Phillips drive system and Class 2A thread fit, these screws enable rapid installation while maintaining precise alignment in automated assembly processes, reducing production downtime and improving manufacturing efficiency across various industrial sectors.

Specification Summary & Compliance

These rounded head screws feature precise Class 2A thread fit according to UNC coarse thread standards with 4-40 thread size and 1/4" length. Manufacturing specifications strictly adhere to ASME B18.6.3 dimensional requirements, ensuring interchangeability and reliable performance. The products are fully compliant with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety, making them suitable for global industrial applications requiring environmental compliance.