S-93802A829 1/4"-20 x 1/2" MIL-DTL-18240, MS3212-49L, NASM3212, NASM82496 Sealing Thread-Locking Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Secure vibration resistance with nylon patch thread locking that maintains integrity from -40° to 225°F
• Reliable sealing performance under high-pressure conditions up to 6000 psi, thanks to the integrated silicone rubber O-ring
• Corrosion-resistant durability from 18-8 stainless steel construction with passivated finish for harsh environments
• Broad temperature compatibility with O-ring functionality from -80° to 400°F, ideal for thermal cycling applications
• High tensile strength of 70,000 psi ensures load-bearing reliability in demanding assemblies
• Easy installation with standard Phillips No. 3 drive and rounded pan head design for efficient torque application
• Industry-standard compliance meeting MIL-DTL-18240, RoHS 3, and REACH for quality assurance

Professional Applications & Engineering Value

This nylon patch locking rounded head screw delivers critical sealing and vibration resistance in industrial settings where pressure integrity is paramount. Engineered with 18-8 stainless steel and a passivated finish, it resists corrosion in chemical or marine environments. The combination of UNC coarse threading and Class 2A fit ensures quick assembly with consistent engagement, while the silicone rubber O-ring creates a dependable seal against fluids and gases. Ideal for high-pressure equipment, automotive assemblies, and aerospace components, this screw solves common failure points like loosening under dynamic loads and leakage in pressurized systems, providing long-term reliability with minimal maintenance.

Specification Summary & Compliance

This screw features 1/4"-20 UNC coarse threads with Class 2A tolerance for precise fit, fully threaded for maximum grip. It complies with MIL-DTL-18240 (referencing MS3212-49L, NASM3212, NASM82496), ensuring adherence to rigorous manufacturing standards. Environmental and safety compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), confirming it is free of restricted substances and safe for global industrial use.