S-90283A106 4-40 x 1/4" 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 harsh industrial environments
• Reliable thread engagement through Class 2A coarse UNC threads ensuring secure fastening and vibration resistance
• Optimized drive compatibility with slotted pan head design for easy installation using standard tools
• Consistent mechanical performance backed by Rockwell B60 hardness for dependable load-bearing capacity
• Full-threaded design maximizing grip length and distribution of stress across applications
• Regulatory compliance assurance meeting ASME B18.6.3, RoHS 3, and REACH standards for safe global usage
• Versatile right-hand threading compatible with common assembly processes and replacement parts

Professional Applications & Engineering Value

These 4-40 UNC zinc-plated steel rounded pan head screws deliver critical solutions for industrial fastening challenges where corrosion resistance and mechanical reliability are paramount. The coarse thread design prevents cross-threading in high-vibration settings, while the slotted drive accommodates rapid assembly in electronics, machinery, and automotive components. Manufactured with fully threaded Class 2A fit, they ensure uniform clamping force and reduce the risk of loosening under dynamic loads. The zinc plating provides a protective barrier against moisture and chemicals, making these industrial fasteners ideal for outdoor equipment, electrical enclosures, and production line fixtures where durability and regulatory compliance are non-negotiable.

Specification Summary & Compliance

These screws maintain precise Class 2A thread fit per UNC standards with 1/4" length and 4-40 thread size. Manufacturing adheres to ASME B18.6.3 specifications for dimensional accuracy and performance. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and global market acceptance.