S-96562A601 4-40 x 5/16" 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 dynamic environments
• Superior corrosion protection through 18-8 stainless steel construction and passivated surface treatment
• High-strength performance delivering 60,000 psi tensile strength for demanding industrial applications
• Wide temperature compatibility with reliable locking performance from -70° to 250° F
• Precision thread engagement with Class 2A UNC coarse threads ensuring consistent installation and removal
• Optimized drive efficiency through Phillips No. 1 drive design for controlled torque application
• Regulatory compliance assurance meeting ASME B18.6.3 standards and environmental regulations

Professional Applications & Engineering Value

Engineered for critical fastening applications where vibration resistance and material integrity are paramount, these 4-40 UNC nylon patch locking screws provide reliable performance in industrial machinery, electronic enclosures, and automotive assemblies. The 18-8 stainless steel construction combined with passivated finish offers exceptional corrosion resistance in harsh environments, while the nylon patch locking technology eliminates the need for separate locking components, reducing assembly time and costs. The pan head Phillips design with No. 1 drive size ensures secure installation without cam-out, maintaining consistent clamping force in applications subject to thermal cycling and mechanical stress. These fully threaded screws with coarse thread spacing deliver maximum engagement strength in various materials, making them ideal for maintenance-critical equipment where disassembly and reassembly are routine.

Specification Summary & Compliance

This 4-40 UNC screw features precision Class 2A thread fit with coarse thread spacing, manufactured to ASME B18.6.3 specifications for dimensional accuracy and performance reliability. The fastener maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets. With complete threading along the 5/16" length and standardized pan head profile, these screws deliver consistent performance meeting industrial fastener requirements for quality and safety.