S-91737A312 4-40 x 3/4" ASME B18.6.3 Stainless Steel Fillister Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 stainless steel and passivated finish, ideal for harsh environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B85 hardness for reliable load-bearing
• Precise, secure fastening ensured by Class 2A thread fit and fully threaded coarse UNC design
• Optimized drive engagement with Phillips No. 1 drive and high, narrow fillister head for efficient installation
• Broad industry compliance meeting ASME B18.6.3, RoHS 3, and REACH standards for quality assurance
• Versatile 3/4" length and rounded head profile for applications requiring low-profile, durable fasteners

Professional Applications & Engineering Value

These 4-40 UNC rounded fillister head screws are engineered to address critical industrial challenges where corrosion resistance, mechanical integrity, and precise assembly are paramount. The 18-8 stainless steel construction, combined with a passivated finish, provides excellent protection against oxidation and chemical exposure, making them ideal for electronics enclosures, marine hardware, and food processing equipment. The coarse thread and Class 2A fit ensure rapid installation and vibration resistance, while the Phillips drive and rounded head design facilitate secure, flush mounting in tight spaces. This combination of material properties and design features delivers long-term reliability, reducing maintenance needs and downtime in demanding industrial fastening applications.

Specification Summary & Compliance

This screw adheres to Class 2A thread fit per UNC standards, ensuring dimensional accuracy and interchangeability. It is manufactured in compliance with ASME B18.6.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulatory requirements, confirming its suitability for global markets and environmentally conscious applications.