S-95536A331 M4 x 14.5 mm ASTM A581, ASTM A582 Captive Panel Screws

Key Features & Benefits at a Glance

• Tool-free installation and adjustment with knurled thumb head for superior grip in tight spaces
• Exceptional corrosion resistance from 18-8 stainless steel construction for long service life in harsh environments
• Secure panel retention through partial threading design that prevents complete disassembly
• Quick assembly with coarse metric threading (M4 x 0.7 mm) enabling faster installation than fine-thread alternatives
• Dual drive compatibility featuring both thumb operation and slotted drive for flexible installation methods
• Reliable performance standards meeting ASTM A581 specifications for consistent quality and dimensional accuracy
• Environmentally compliant manufacturing adhering to RoHS 3 and REACH regulations for global market acceptance

Professional Applications & Engineering Value

This M4 thumb screw delivers critical engineering advantages for panel mounting applications where frequent access and reliability are paramount. The 18-8 stainless steel construction provides excellent corrosion resistance, eliminating failure points in industrial environments with moisture or chemical exposure. The knurled round head offers exceptional grip even with gloved hands, while the partial threading ensures panels remain captive during service - preventing lost components in electrical enclosures, machinery guards, and instrumentation panels. The coarse metric thread (0.7 mm pitch) enables rapid installation and removal, significantly reducing maintenance downtime in production environments where quick access to internal components is essential for operational efficiency.

Specification Summary & Compliance

This captive panel screw features precision metric coarse threading (M4 x 0.7 mm) with standard right-hand thread direction and partial threading extending 5.5 mm from the 8 mm diameter knurled head. Manufactured to ASTM A581 specifications ensuring dimensional consistency and mechanical properties. The component is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications requiring verified material safety and restricted substance control.