S-90910A714 4-40 x 5/16" ASME B18.3 Stainless Steel Button Head Torx Plus Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel and passivated finish, ideal for harsh environments.
• Enhanced torque transmission via Torx Plus IP8 drive, minimizing cam-out and tool wear.
• High mechanical strength offering 60,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing.
• Precise thread engagement with Class 2A UNC coarse threads ensuring secure fastening in industrial assemblies.
• Low-profile rounded button head design provides a smooth finish while reducing snagging risks.
• Full threading along the 5/16" length enables consistent grip across materials.
• Compliance with major standards including ASME B18.3, RoHS 3, and REACH for safe, regulated use.

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 4-40 UNC screws with a rounded head and Torx Plus drive address common assembly challenges. The 18-8 Stainless Steel material, combined with a passivated finish, resists oxidation and chemical exposure, extending service life in machinery, electronics, and outdoor equipment. The fully threaded design and Class 2A thread fit ensure vibration resistance and uniform clamping force, reducing loosening in high-stress environments. By integrating ASME B18.3 specifications, these fasteners deliver consistent dimensional accuracy, streamlining procurement and installation for engineers and OEMs.

Specification Summary & Compliance

This product adheres to Class 2A thread fit per UNC standards with a coarse thread spacing for efficient installation. Manufacturing follows ASME B18.3 specifications, ensuring precise dimensions such as head diameter (0.213") and length (5/16"). Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms the absence of hazardous substances, supporting global supply chain requirements.