S-90343A131 1/4"-20 x 5/8" ASME B18.3 18-8 Stainless Steel Thread-Locking Socket Head Screws

Key Features & Benefits at a Glance

• Permanent vibration resistance with epoxy thread locker that eliminates the need for secondary locking mechanisms
• Superior corrosion resistance from 18-8 stainless steel construction for long service life in harsh environments
• Precise assembly fit ensured by Class 3A thread fit for high-tolerance industrial applications
• High load-bearing capability with 70,000 psi tensile strength for demanding mechanical fastening
• Wide temperature tolerance from -60° to 300°F for stable performance across diverse operating conditions
• Optimized drive engagement with hex socket design providing superior torque transmission and strip resistance
• Industry-standard compliance meeting ASME B18.3 specifications for reliable interchangeability

Professional Applications & Engineering Value

These socket head cap screws with permanent epoxy thread locker solve critical vibration-induced loosening problems in industrial machinery, automotive assemblies, and precision equipment. The 18-8 stainless steel construction provides excellent corrosion resistance while maintaining Rockwell B70 hardness for durability. The UNC coarse thread pattern with Class 3A fit ensures rapid installation and secure fastening in high-vibration environments. The hex drive design allows for high torque application in confined spaces, making these fasteners ideal for critical joints where maintenance access is limited. The epoxy adhesive begins hardening within 15 minutes and reaches full strength in 24 hours, creating a permanent bond that withstands extreme temperature fluctuations from -60° to 300°F.

Specification Summary & Compliance

Manufactured to precise Class 3A thread fit tolerances with UNC 1/4"-20 thread specifications. Complies with ASME B18.3 standards for dimensional accuracy and performance. Features include 3/16" hex drive, 5/8" length, and right-hand thread direction. The permanent epoxy thread locker provides reliable locking performance across the specified temperature range while maintaining the mechanical properties of 18-8 stainless steel.