S-93802A433 4-40 x 5/8" MIL-DTL-18240, MS3212-7L, NASM3212, NASM82496 Sealing Thread-Locking Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior sealing performance with integrated silicone rubber O-ring that withstands pressures up to 6000 psi, preventing leaks in critical applications
• Exceptional temperature resistance with O-ring operating range from -80° to 400° F and thread locker stability from -40° to 225° F
• Reliable vibration resistance through nylon patch thread locking technology that maintains secure fastening under dynamic conditions
• Corrosion-resistant construction using 18-8 stainless steel with passivated finish for extended service life in harsh environments
• High tensile strength of 70,000 psi ensures structural integrity and load-bearing capability in demanding applications
• Quick installation and removal with Phillips No. 1 drive and coarse UNC threading for efficient assembly operations
• Regulatory compliance assurance meeting MIL-DTL-18240, RoHS 3, and REACH standards for quality and environmental responsibility

Professional Applications & Engineering Value

These 4-40 UNC rounded head screws deliver exceptional engineering value by solving critical sealing and vibration challenges in industrial applications. The combination of 18-8 stainless steel construction with passivated finish provides superior corrosion resistance, while the integrated nylon patch thread locker ensures reliable performance in high-vibration environments. The silicone rubber O-ring technology creates a robust seal capable of withstanding extreme pressure differentials up to 6000 psi, making these fasteners ideal for hydraulic systems, pneumatic equipment, and industrial machinery where fluid containment is critical. The coarse UNC threading and Phillips drive design facilitate quick installation in field maintenance and production assembly scenarios, reducing downtime while maintaining the high reliability demanded by military and industrial specifications.

Specification Summary & Compliance

These rounded head screws feature precision Class 2A thread fit with 4-40 UNC coarse threading and full threading along the 5/8" length. Manufacturing and performance comply with MIL-DTL-18240 specifications (including MS3212-7L, NASM3212, and NASM82496 equivalents) ensuring consistent quality and reliability. Environmental compliance is maintained through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) adherence, confirming the absence of restricted substances while delivering the mechanical performance required for demanding industrial applications.