S-91735A103 4-40 x 5/16" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance in harsh environments thanks to 316 stainless steel construction and passivated finish
• Reliable fastening performance with 80,000 psi tensile strength and Rockwell B85 hardness for demanding applications
• Easy installation and removal with Phillips No. 1 drive and right-hand coarse UNC threads
• Precise thread engagement ensured by Class 2A thread fit and fully threaded design
• Broad industrial compatibility with standardized pan head profile and 4-40 thread size
• Long-term durability with corrosion-resistant properties ideal for chemical and marine settings
• Regulatory peace of mind through compliance with ASME B18.6.3, RoHS 3, and REACH standards

Professional Applications & Engineering Value

This 4-40 UNC rounded pan head Phillips machine screw delivers critical performance in corrosive or high-moisture environments where standard fasteners fail. Manufactured from 316 stainless steel with a passivated finish, it resists pitting and chemical degradation in marine, chemical processing, and food industry applications. The coarse thread design provides superior grip in softer materials and faster installation, while the fully threaded body ensures consistent clamping force across the entire length. With 80,000 psi tensile strength, it maintains integrity under vibration and load stress, making it ideal for machinery, equipment panels, and structural assemblies requiring reliable, long-term fastening solutions.

Specification Summary & Compliance

This screw features precise Class 2A thread fit with 4-40 UNC coarse threads and meets ASME B18.6.3 manufacturing specifications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions adherence. Dimensions include 5/16" length, 0.219" head diameter, and Phillips No. 1 drive size for standardized industrial use.