S-95536A305 M4 x 11 mm ASTM A581, ASTM A582 Captive Panel Screws

Key Features & Benefits at a Glance

• Enhanced manual operation with knurled round head providing superior grip for tool-free tightening and loosening in confined spaces
• Reliable corrosion resistance from 18-8 stainless steel construction, ensuring long-term performance in humid or demanding industrial environments
• Optimized panel retention through partial threading and 5.5 mm thread length, preventing complete disassembly and loss in captive panel applications
• Quick installation with coarse M4 x 0.7 mm metric threads enabling faster assembly compared to fine-pitch alternatives
• Consistent dimensional accuracy with 8 mm head diameter and 11 mm total length for reliable fit in standardized panel openings
• Environmental compliance assurance meeting RoHS 3 and REACH standards, making it suitable for regulated electronics and industrial equipment
• High-strength durability compliant with ASTM A581/A582 specifications, guaranteeing mechanical reliability in vibration-prone applications

Professional Applications & Engineering Value

This M4 thumb screw solves critical challenges in panel mounting hardware where frequent access and component security are paramount. The 18-8 stainless steel material provides excellent corrosion resistance for electronics enclosures, medical devices, and outdoor equipment, while the knurled head ensures operators can securely tighten without specialized tools—reducing maintenance time. The partially threaded design acts as a captive panel screw, preventing accidental detachment in vibration-intensive environments like industrial control systems or transportation equipment. With coarse metric threading, it offers quicker installation than fine-thread alternatives, making it ideal for high-volume assembly lines where speed and reliability are critical.

Specification Summary & Compliance

This metric thumb screw features M4 x 0.7 mm coarse threads with standard metric tolerances, partial threading over 5.5 mm length, and 8 mm knurled head diameter. Manufacturing complies with ASTM A581/A582 standards for material consistency and mechanical properties. The product is verified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to environmental regulations for hazardous substance restrictions.