S-93310A190 8-32 x 1/4" ASME B18.3, ASTM F879, MIL-DTL-18240 Thread-Locking Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Vibration-resistant secure fastening with permanent nylon patch thread locker that maintains integrity from -70° to 250°F
• Superior corrosion resistance thanks to 18-8 stainless steel construction for long-term reliability in harsh environments
• High-strength performance delivering 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
• Precision threading with Class 3A UNC coarse threads ensuring consistent, reliable engagement and fit
• Easy installation and removal with 3/32" hex drive and rounded button head design for accessible tooling
• Full regulatory compliance meeting ASME B18.3, ASTM F879, MIL-DTL-18240, RoHS 3, and REACH standards
• Complete thread coverage with fully threaded shank for maximum grip length and holding power

Professional Applications & Engineering Value

Engineered for critical assemblies where vibration loosening poses a significant risk, these nylon patch locking screws provide permanent resistance to rotational forces without compromising reusability. The 18-8 stainless steel construction offers excellent corrosion resistance for industrial, marine, and outdoor applications, while the Class 3A UNC coarse threading ensures rapid installation and superior thread engagement in various materials. The combination of 70,000 psi tensile strength and Rockwell B55 hardness makes these rounded head screws ideal for machinery, electronic enclosures, and automotive components where both structural integrity and vibration resistance are paramount. The 3/32" hex drive and button head profile facilitate installation in confined spaces while maintaining a low-profile appearance.

Specification Summary & Compliance

These locking fasteners feature precision Class 3A thread fit with UNC coarse threading (8-32 size) and are manufactured to ASME B18.3, ASTM F879, and MIL-DTL-18240 specifications. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations is verified, ensuring safe use across global markets. The nylon patch thread locker maintains consistent performance across the specified temperature range of -70° to 250°F.