S-91785A115 4-40 x 1" ASME B18.6.3 Stainless Steel Truss Head Slotted Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with 18-8 stainless steel and passivated finish, ideal for harsh industrial environments.
• Superior holding power from 100,000 psi tensile strength and coarse UNC threads, ensuring reliable fastening under stress.
• Wide truss head design provides a larger bearing surface, reducing surface pressure and preventing material damage.
• Class 2A thread fit offers consistent assembly with standard nuts and tapped holes, minimizing cross-threading risks.
• Slotted drive compatibility allows for quick installation using common tools, streamlining maintenance and assembly processes.
• Full threading along the 1" length enables adjustable engagement depth for versatile application needs.
• Compliance with ASME B18.6.3, RoHS 3, and REACH ensures adherence to mechanical and environmental standards for global use.

Professional Applications & Engineering Value

Engineered for demanding industrial fastening applications, these 4-40 UNC screws with a rounded truss head and slotted drive address common challenges like vibration loosening and corrosion. The 18-8 stainless steel material, combined with a passivated finish, provides excellent durability in moist or chemical-exposed settings, reducing maintenance frequency. The coarse thread and Class 2A fit ensure quick, secure installation in metals and plastics, making them ideal for machinery, electronics, and automotive assemblies where high tensile strength and regulatory compliance are critical.

Specification Summary & Compliance

This screw meets ASME B18.6.3 specifications for dimensional accuracy, with UNC coarse threads and a Class 2A thread fit for consistent performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in various industries. The 1" length and fully threaded design support precise application requirements.