S-90343A135 1/4"-20 x 1 1/4" ASME B18.3 18-8 Stainless Steel Thread-Locking Socket Head Screws

Key Features & Benefits at a Glance

• Superior vibration resistance with integrated epoxy thread locker that maintains secure fastening under dynamic loads
• Exceptional temperature tolerance from -60°F to 300°F for reliable performance in extreme environments
• High tensile strength of 70,000 psi ensures structural integrity under heavy mechanical stress
• Precision Class 3A thread fit provides superior engagement and reduces the risk of cross-threading during installation
• Corrosion-resistant 18-8 stainless steel construction delivers long-lasting durability in harsh industrial conditions
• Standard hex drive compatibility with 3/16" drive size enables quick installation using common tools
• Fully threaded design offers maximum thread engagement and clamping force along the entire fastener length

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 18-8 stainless steel socket head cap screws combine material excellence with advanced epoxy thread locking technology to solve critical fastening challenges. The UNC coarse thread configuration with Class 3A precision fit ensures reliable installation in high-vibration environments where loosening can compromise safety and performance. The Rockwell B70 hardness rating provides exceptional wear resistance, while the temperature-resistant epoxy adhesive maintains locking integrity across extreme thermal cycles. These features make these socket head cap screws ideal for machinery, automotive assemblies, and industrial equipment requiring secure, permanent fastening solutions that withstand harsh operating conditions.

Specification Summary & Compliance

This 1/4"-20 x 1-1/4" socket head cap screw features Class 3A thread fit precision with UNC coarse threads and right-hand threading direction. Manufactured to meet ASME B18.3 specifications, the fastener ensures dimensional accuracy and performance reliability. The fully threaded design with standard socket head profile and 3/16" hex drive provides consistent installation characteristics. The epoxy thread locker begins hardening in 15 minutes and reaches full strength within 24 hours, delivering permanent vibration resistance for critical industrial applications.