S-96562A108 4-40 x 3/8" ASME B18.6.3 Thread-Locking Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Permanent vibration resistance with nylon patch thread locker that maintains secure fastening in high-stress environments
• Superior corrosion protection through 18-8 stainless steel construction and passivated surface treatment
• Exceptional temperature tolerance from -70° to 250°F for reliable performance in extreme operating conditions
• High-strength reliability with 60,000 psi tensile strength and Rockwell B70 hardness for demanding applications
• Precision thread engagement with Class 2A fit and UNC coarse threading for easy installation and secure holding power
• Optimized drive performance featuring Phillips No. 1 drive and pan head design for efficient installation and removal
• Full-threaded design ensures maximum grip length and uniform stress distribution along the entire fastener

Professional Applications & Engineering Value

These 4-40 UNC nylon patch locking screws deliver critical vibration resistance in industrial assemblies where loosening under dynamic loads poses significant reliability concerns. The permanent nylon patch thread locker eliminates the need for secondary locking components while maintaining consistent clamping force across the specified temperature range of -70° to 250°F. Manufactured from 18-8 stainless steel with passivated finish, these fasteners provide exceptional corrosion resistance in harsh environments including chemical processing, marine applications, and outdoor equipment. The combination of Class 2A thread fit with coarse UNC threading ensures rapid installation and reliable performance in materials where fine threads might strip or fail. The pan head Phillips design offers optimal drive engagement for assembly efficiency while the fully threaded construction maximizes connection integrity across the entire fastener length.

Specification Summary & Compliance

These locking screws feature Class 2A thread fit with 4-40 UNC coarse threading and right-hand thread direction. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and performance standards. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring restricted substance compliance for global industrial applications.