S-94375A320 4-40 x 1/2" ASTM A581, ASTM A582 Captive Panel Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Reliable panel retention through partial threading design that prevents complete disassembly
• Precise thread engagement with Class 2A fit ensuring consistent performance and easy installation
• Quick assembly capability with coarse UNC threads that reduce installation time and prevent cross-threading
• Easy manual operation featuring a slotted drive for straightforward tool-free adjustments
• Environmental compliance meeting RoHS 3 and REACH standards for safe use in regulated industries
• Proven durability backed by ASTM A581 material specification for consistent mechanical properties

Professional Applications & Engineering Value

This 4-40 UNC captive panel screw delivers exceptional engineering value in applications requiring secure panel retention while allowing for regular maintenance access. The 18-8 stainless steel construction provides outstanding corrosion resistance, making it ideal for electronics enclosures, industrial control panels, and outdoor equipment where environmental exposure is a concern. The partial threading design ensures panels remain captive during service, eliminating lost hardware while maintaining alignment precision. The coarse thread configuration enables rapid installation in various panel materials, reducing assembly time in high-volume production environments. With its slotted drive and right-hand thread orientation, this screw offers compatibility with standard tools while providing reliable performance in vibration-prone applications common in industrial settings.

Specification Summary & Compliance

This captive panel screw features precise Class 2A thread fit with 4-40 UNC coarse thread specifications and 1/2" length with 3/16" thread length. Manufacturing complies with ASTM A581 material standards, ensuring consistent mechanical properties and performance. The product meets RoHS 3 (2015/863/EU) compliance for restricted substances and REACH (EC 1907/2006) regulations, making it suitable for use in environmentally conscious applications and regulated industries.