S-93802A621 8-32 x 1/4" MIL-DTL-18240, MS3212-21L, NASM3212, NASM82496 Sealing Thread-Locking Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior Sealing Performance: Achieves reliable leak prevention up to 6000 psi with an integrated silicone O-ring, ideal for high-pressure environments.
• Enhanced Vibration Resistance: Nylon patch thread locker ensures secure fastening and prevents loosening under dynamic loads, maintaining integrity from -40° to 225° F.
• Corrosion-Resistant Durability: Made from 18-8 stainless steel with a passivated finish, offering excellent resistance to rust and harsh conditions.
• Broad Temperature Compatibility: O-ring functions effectively from -80° to 400° F, supporting use in extreme thermal applications.
• High Tensile Strength: With a tensile strength of 70,000 psi, this screw provides robust mechanical performance for demanding assemblies.
• Easy Installation and Removal: Phillips drive (No. 2) and rounded pan head design allow for straightforward tool engagement and reduced installation time.
• Full Thread Engagement: Fully threaded UNC coarse design with Class 2A fit ensures consistent grip and alignment in various materials.

Professional Applications & Engineering Value

This 8-32 UNC 1/4" rounded head screw is engineered to address critical challenges in high-pressure sealing and vibration-prone environments. The combination of a silicone O-ring and nylon patch thread locker delivers dual functionality: the O-ring creates a tight seal against fluids and gases, while the thread locker locks the fastener in place, preventing back-off due to operational shocks. Constructed from 18-8 stainless steel with a passivated finish, it resists corrosion in industrial, aerospace, and marine settings. Its Phillips drive and pan head profile facilitate quick assembly, making it a reliable choice for applications requiring MIL-DTL-18240 compliance, such as hydraulic systems, pumps, and avionics, where failure is not an option.

Specification Summary & Compliance

This screw features a Class 2A thread fit with UNC coarse threading for precise engagement and meets specifications including MIL-DTL-18240 (referencing MS3212-21L, NASM3212, and NASM82496). It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are upheld. Dimensions include a head diameter of 0.347", length of 1/4", and maximum hole diameter suitability of 0.177", supporting consistent performance in regulated industries.