S-93802A423 4-40 x 5/16" MIL-DTL-18240, MS3212-2L, NASM3212, NASM82496 Sealing Thread-Locking Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Reliable Sealing Performance: Withstands up to 6000 psi maximum pressure, ensuring leak-proof connections in demanding fluid and gas systems.
• Enhanced Vibration & Loosening Resistance: Nylon patch thread locker maintains secure fastening across a wide temperature range from -40° to 225°F.
• Superior Corrosion Resistance: 18-8 stainless steel construction with passivated finish provides excellent durability in harsh, corrosive environments.
• High Tensile Strength: 70,000 psi tensile strength ensures robust, reliable fastening for critical industrial and aerospace applications.
• Dual Sealing & Locking Mechanism: Combines silicone rubber O-ring (effective from -80° to 400°F) with nylon patch for redundant sealing and vibration resistance.
• Broad Regulatory Compliance: Meets MIL-DTL-18240, NASM3212, RoHS 3, and REACH standards, ensuring suitability for regulated industries.
• Easy Installation & Removal: Phillips No. 1 drive and Class 2A thread fit with coarse UNC threading allow for quick assembly and disassembly.

Professional Applications & Engineering Value

This 4-40 UNC rounded head Phillips screw is engineered to address critical challenges in aerospace, industrial machinery, and high-pressure fluid systems. The combination of 18-8 stainless steel and a passivated finish delivers exceptional corrosion resistance, while the integrated silicone rubber O-ring and nylon patch thread locker provide a dual-defense against leaks and vibration-induced loosening. Its coarse UNC threading and Class 2A fit ensure precise engagement and ease of maintenance, making it ideal for applications where reliability under extreme pressure (up to 6000 psi) and temperature fluctuations is non-negotiable. This sealing screw eliminates the need for additional sealing components, streamlining assembly and reducing total cost of ownership.

Specification Summary & Compliance

This screw features a 4-40 UNC thread with Class 2A fit and coarse thread spacing for reliable engagement. It is manufactured in compliance with MIL-DTL-18240 (including MS3212-2L, NASM3212, NASM82496), ensuring adherence to strict aerospace and defense specifications. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming its suitability for global markets with stringent environmental and safety regulations.