S-90283A113 4-40 x 3/4" 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 demanding industrial environments
• Exceptional tensile strength rated at 60,000 PSI for reliable performance in high-stress applications
• Precision Class 2A thread fit ensures smooth installation and secure fastening with standard UNC coarse threading
• Full threading design provides maximum grip length and uniform stress distribution across the entire fastener
• Rockwell B60 hardness maintains structural integrity and prevents deformation under heavy loads
• Standard pan head profile with slotted drive offers compatibility with common tools and easy installation
• Comprehensive compliance with ASME B18.6.3 specifications and environmental regulations including RoHS 3 and REACH

Professional Applications & Engineering Value

These 4-40 UNC zinc-plated steel screws deliver critical engineering advantages for industrial assembly operations. The zinc-plated finish provides essential corrosion protection in environments exposed to moisture and chemicals, while the Rockwell B60 hardness ensures the rounded pan head maintains its structural integrity during repeated torque applications. The coarse UNC threading with Class 2A fit enables quick installation in various materials without compromising holding power, making these fully threaded screws ideal for machinery assembly, electrical enclosures, and automotive components where vibration resistance and long-term reliability are paramount. The combination of 60,000 PSI tensile strength and standardized slotted drive design ensures these fasteners meet the demanding requirements of maintenance, repair, and OEM manufacturing operations.

Specification Summary & Compliance

These rounded head screws feature precise 4-40 UNC coarse threads with Class 2A thread fit for consistent engagement and reliable performance. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. The products are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets. The 3/4" length and fully threaded design provide versatile fastening solutions while maintaining the specified 60,000 PSI tensile strength and Rockwell B60 hardness throughout the fastener.