S-99091A113 4-40 x 3/4" Plastic Hex Head Screws

Key Features & Benefits at a Glance

• Corrosion-free performance with durable nylon plastic construction, ideal for humid or chemical environments
• Secure, vibration-resistant fastening ensured by Class 2A thread fit and fully threaded design
• Wide temperature tolerance from -40° to 185°F for stable performance in varied operating conditions
• Quick installation and removal with external hex drive and standard 3/16" head width
• Reliable coarse UNC threading providing strong grip in plastic and soft materials
• Environmental compliance with RoHS 3, safe for regulated industries
• Lightweight and non-conductive properties reducing assembly weight and electrical risks

Professional Applications & Engineering Value

These 4-40 UNC nylon plastic hex head screws deliver critical advantages in electrical enclosures, automotive trim, and consumer electronics where metal fasteners pose corrosion or short-circuit risks. The black nylon material resists UV degradation and chemicals, while the coarse thread design prevents stripping in plastic housings. With a temperature range of -40° to 185°F, they maintain dimensional stability in outdoor or thermally cyclic environments. The external hex drive allows high-torque installation with standard tools, and the fully threaded body ensures consistent clamping force along the entire 3/4" length.

Specification Summary & Compliance

Manufactured to inch system standards with 4-40 UNC coarse threads and Class 2A thread fit for consistent interchangeability. Features a 0.112" thread diameter and 3/4" length with fully threaded construction. Compliant with RoHS 3 (2015/863/EU) regulations, ensuring hazardous substance restrictions are met for global distribution.