S-91249A617 4-40 x 1 1/8" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with Black-Oxide 18-8 Stainless Steel construction, ideal for harsh environments and extended service life
• High tensile strength of 70,000 psi ensures reliable performance under mechanical stress and vibration
• Excellent thread engagement with fully threaded 4-40 UNC coarse threads and Class 2A fit for quick installation and secure fastening
• Easy installation and removal using standard Phillips No. 1 drive, reducing assembly time and tool wear
• Durable rounded pan head design provides a low-profile, finished appearance while resisting cam-out during tightening
• Compliance with major industry standards including ASME B18.6.3, ensuring dimensional accuracy and interchangeability
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance for safe use in regulated industries

Professional Applications & Engineering Value

These Black-Oxide 18-8 Stainless Steel Rounded Head Screws deliver exceptional value in demanding industrial applications where corrosion resistance and mechanical reliability are critical. The 4-40 UNC coarse thread design ensures rapid assembly in materials like aluminum and plastics, while the fully threaded construction provides consistent clamping force across the entire length. With a 70,000 psi tensile strength, these screws withstand vibration and dynamic loads in machinery, electronics enclosures, and automotive components. The Black-Oxide finish on 18-8 stainless steel enhances surface durability and reduces galling, making them ideal for repeated disassembly in maintenance operations. The Phillips No. 1 drive offers familiar, efficient installation with standard tools, reducing labor costs in high-volume production environments.

Specification Summary & Compliance

This screw features precise Class 2A thread fit per UNC standards, ensuring consistent engagement and interchangeability. Manufacturing follows ASME B18.6.3 specifications for dimensional accuracy, including head diameter (0.219"), length (1-1/8"), and thread diameter (0.112"). The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted substances for industrial and international applications.