S-93996A111 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Vibration-resistant secure fastening through nylon patch thread locking that maintains integrity across a wide temperature range from -70° to 250°F
• Superior corrosion resistance provided by 18-8 stainless steel construction, ensuring long-term reliability in harsh industrial environments
• High strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for demanding mechanical applications
• Precise alignment and spacing enabled by the 1/8" shoulder diameter with tight tolerances for accurate component positioning
• Reliable thread engagement through Class 2A UNC coarse threads that facilitate easier assembly and disassembly
• Dual-drive versatility with both socket and slotted head options for flexible installation in various access scenarios
• Environmental compliance assurance with RoHS 3 and REACH compliance for global manufacturing applications

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw delivers exceptional engineering value through its precision-machined 18-8 stainless steel construction and innovative nylon patch locking technology. The precisely controlled 1/8" shoulder diameter with minimal tolerance variation ensures accurate component alignment in assemblies where precise spacing is critical, such as in rotating machinery, precision instruments, and automation equipment. The coarse UNC threads combined with Class 2A fit provide reliable fastening while accommodating minor misalignments during assembly. The integrated nylon patch thread locker eliminates the need for separate locking components, reducing assembly time and preventing loosening under vibration - a common failure point in industrial machinery. This combination of precision shoulder control and vibration-resistant locking makes it ideal for applications requiring both accurate positioning and secure fastening in challenging environments.

Specification Summary & Compliance

This precision shoulder screw features 4-40 UNC coarse threads with Class 2A thread fit for consistent engagement and assembly. The shoulder maintains precise dimensions with diameter tolerance of -0.001" to 0" and length tolerance of 0" to 0.002" for accurate component spacing. Manufactured from 18-8 stainless steel with Rockwell B55 hardness and 70,000 psi tensile strength, this fastener meets rigorous industrial requirements. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility in global manufacturing applications.