S-99091A107 4-40 x 9/32" Plastic Hex Head Screws

Key Features & Benefits at a Glance

• Corrosion-resistant nylon plastic construction eliminates rust and galvanic corrosion, ideal for electrical and chemical environments
• External hex head design provides secure tool engagement for quick installation and removal with standard wrenches
• Class 2A thread fit with UNC coarse threading ensures reliable engagement and vibration resistance in plastic and soft materials
• Wide temperature tolerance (-40° to 185°F) maintains integrity across diverse operating conditions from freezing to elevated temperatures
• Fully threaded shank delivers maximum grip length and uniform stress distribution for superior holding power
• RoHS 3 compliance meets stringent environmental regulations for electronics and regulated industries
• Lightweight non-conductive properties prevent electrical shorts while reducing overall assembly weight

Professional Applications & Engineering Value

These 4-40 UNC nylon plastic hex head screws solve critical fastening challenges where metal fasteners fail. The black nylon construction provides excellent dielectric properties for electrical enclosures, control panels, and PCB mounting where conductivity must be avoided. The coarse UNC thread form with Class 2A fit prevents stripping in plastic housings and soft materials, while the external hex drive ensures positive torque transmission without cam-out. Operating across -40° to 185°F temperature ranges, these screws maintain dimensional stability in outdoor equipment, automotive components, and thermal cycling applications where metal expansion/contraction would compromise joint integrity.

Specification Summary & Compliance

Manufactured to inch system specifications with 4-40 UNC coarse threads and Class 2A thread fit tolerance for consistent engagement. Features right-hand thread direction with fully threaded 9/32" length. Compliant with RoHS 3 (2015/863/EU) environmental regulations, containing no restricted hazardous substances. Suitable for applications requiring non-metallic, non-corrosive fastening solutions across industrial and electronic assemblies.