S-95536A344 M4 x 17.5 mm ASTM A581, ASTM A582 Captive Panel Screws

Key Features & Benefits at a Glance

• Enhanced grip and torque application with knurled round head design for secure manual operation without tools
• Superior corrosion resistance thanks to 18-8 stainless steel construction, ideal for harsh industrial environments
• Quick and easy installation with coarse M4 x 0.7 mm threading for faster assembly in panel applications
• Secure captive panel retention through partial threading and 17.5 mm length, preventing loss in mounted assemblies
• Reliable mechanical performance ensured by compliance with ASTM A581 material specifications
• Safe for global use with RoHS 3 and REACH compliance, meeting international environmental regulations
• Right-hand threading compatibility for standard installation procedures across metric fastener systems

Professional Applications & Engineering Value

This M4 thumb screw delivers exceptional value in captive panel assemblies where frequent access and durability are critical. The 18-8 stainless steel material provides excellent resistance to oxidation and chemical exposure, extending service life in electronics enclosures, industrial control panels, and instrumentation. The knurled head offers superior finger-grip even with gloves, reducing installation time and eliminating tool dependency. With its coarse metric thread (0.7 mm pitch), this partially threaded screw ensures rapid engagement in various panel thicknesses while maintaining secure captive functionality. This combination of features addresses common challenges in maintenance-heavy environments, providing a reliable fastening solution that withstands repeated use without compromising performance.

Specification Summary & Compliance

This metric thumb screw features M4 x 0.7 mm coarse threads with standard right-hand direction and partial threading over 5.5 mm of the 17.5 mm total length. The fastener meets ASTM A581 material specifications for consistent quality and performance. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) ensures environmental responsibility and global market acceptability. The 8 mm knurled round head provides optimal manual drive functionality for captive panel applications requiring frequent access.