S-91770A096 4-40 x 1/2" ASME B18.6.3 Stainless Steel Truss Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
• Enhanced load distribution thanks to the wide rounded truss head design, reducing surface pressure and material damage
• High tensile strength of 70,000 psi ensures reliable performance under heavy mechanical stress
• Secure and efficient installation with Phillips No. 1 drive, minimizing cam-out and speeding up assembly
• Precise thread engagement with Class 2A coarse UNC threads, providing consistent fit and vibration resistance
• Full threading along the 1/2" length maximizes grip and fastening versatility in various applications
• Compliance with ASME B18.6.3 and environmental standards guarantees quality, safety, and regulatory adherence

Professional Applications & Engineering Value

These 4-40 UNC rounded truss head screws are engineered to address common industrial challenges such as vibration loosening and corrosion in demanding settings. Made from passivated 18-8 stainless steel, they offer excellent durability and chemical resistance, making them suitable for electronics, machinery, and outdoor equipment. The coarse thread and Class 2A thread fit ensure quick, secure fastening with reduced risk of cross-threading, while the wide truss head distributes clamping force effectively to prevent damage to softer materials. Ideal for assembly lines and maintenance operations, these screws enhance productivity and longevity in industrial applications.

Specification Summary & Compliance

This product features a 4-40 UNC coarse thread with Class 2A thread fit for precise dimensional accuracy. It is manufactured in compliance with ASME B18.6.3 standards and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulatory requirements, ensuring environmental safety and quality assurance.