S-94375A340 4-40 x 3/4" ASTM A581, ASTM A582 Captive Panel Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction for long-lasting performance in harsh environments
• Reliable panel retention through partially threaded design that prevents complete disengagement from panels
• Easy installation and removal with slotted drive style requiring only basic tools for maintenance operations
• Precise thread engagement with Class 2A thread fit ensuring consistent, vibration-resistant fastening
• Smooth rounded head design that eliminates snagging and provides clean appearance in finished applications
• Comprehensive regulatory compliance meeting ASTM A581, RoHS 3, and REACH standards for global market acceptance
• Optimized coarse threading (4-40 UNC) for faster installation and reduced cross-threading risks in industrial settings

Professional Applications & Engineering Value

This 4-40 UNC coarse thread captive panel screw delivers exceptional engineering value in demanding industrial applications where panel retention and corrosion resistance are critical. The 18-8 Stainless Steel material provides excellent protection against rust and chemical exposure, making it ideal for electronic enclosures, control panels, and machinery where environmental factors would compromise ordinary fasteners. The partially threaded design ensures screws remain captive in panels during service and maintenance, eliminating lost hardware in hard-to-reach areas. With its slotted drive style and smooth rounded head, this fastener enables quick assembly while maintaining a professional appearance in visible applications. The coarse threading allows for rapid installation in various panel materials without the precision requirements of fine threads.

Specification Summary & Compliance

This captive panel screw features precise Class 2A thread fit per UNC standards with a 4-40 thread size and 3/4" overall length. Manufacturing follows ASTM A581 specifications for consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and global market acceptance. The inch system measurements provide dimensional accuracy for North American and international applications requiring imperial fasteners.