S-99091A115 4-40 x 1" Plastic Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance eliminates rust concerns in humid or chemical environments
• Excellent electrical insulation properties prevent short circuits in electronic assemblies
• Lightweight nylon construction reduces overall component weight without sacrificing durability
• Wide temperature tolerance from -40° to 185°F ensures reliable performance in varying conditions
• Class 2A thread fit provides consistent, reliable engagement with mating components
• External hex drive design allows for quick installation with standard tools
• RoHS 3 compliance meets international environmental standards for restricted substances

Professional Applications & Engineering Value

These 4-40 UNC nylon plastic hex head screws deliver critical engineering advantages where metal fasteners fail. The black nylon material provides inherent corrosion resistance, eliminating galvanic corrosion issues in electronic enclosures and marine applications. The coarse UNC threading with Class 2A fit ensures rapid assembly with consistent torque values, while the fully threaded design maximizes holding power across the entire 1" length. As electrical insulation screws, they prevent current leakage in sensitive electronic equipment, making them ideal for PCB mounting, control panels, and electrical components where both mechanical fastening and dielectric properties are required.

Specification Summary & Compliance

Manufactured to UNC coarse thread standards with Class 2A thread fit tolerance for reliable engagement. These inch system screws feature 4-40 thread size with 0.112" diameter and 1" length. The external hex drive accommodates standard wrenches for efficient installation. Fully compliant with RoHS 3 (2015/863/EU) regulations, ensuring environmental safety and restricted substance adherence for global manufacturing requirements.