S-93802A329 2-56 x 1/2" MIL-DTL-18240 Sealing Thread-Locking Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel and passivated finish for long-lasting performance in harsh environments.
• Reliable sealing under high pressure up to 6000 psi, thanks to the integrated silicone rubber O-ring, preventing leaks in critical applications.
• Vibration-resistant locking provided by the nylon patch thread locker, maintaining clamp load in dynamic conditions from -40° to 225° F.
• Broad temperature compatibility with O-ring performance from -80° to 400° F, ensuring seal integrity in extreme thermal cycles.
• High tensile strength of 70,000 psi for secure fastening in demanding mechanical assemblies without failure.
• Easy installation and removal with Phillips drive and coarse UNC threads, reducing assembly time and tool wear.
• Consistent dimensional accuracy with Class 2A thread fit, ensuring reliable engagement and interchangeability.

Professional Applications & Engineering Value

This 2-56 UNC rounded head Phillips screw is engineered to address common industrial challenges like fluid leakage, vibration loosening, and environmental degradation. The combination of 18-8 stainless steel and a passivated finish provides excellent corrosion resistance, ideal for marine, chemical, and outdoor equipment. The silicone rubber O-ring and nylon patch thread locker work synergistically to create a dual-sealing effect, preventing ingress of moisture, dust, and gases while resisting shock and vibration in high-pressure systems up to 6000 psi. Commonly used in pneumatic assemblies, fluid handling systems, and electronic enclosures, this screw ensures long-term reliability and reduces maintenance costs by withstanding temperature extremes from -80° to 400° F, making it a versatile choice for sealing applications in aerospace, automotive, and industrial machinery.

Specification Summary & Compliance

This screw features a Class 2A thread fit with UNC coarse threading for robust engagement and ease of assembly. It complies with MIL-DTL-18240 specifications, ensuring adherence to stringent military standards for quality and performance. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming the absence of hazardous substances and supporting environmental and safety regulations in global supply chains.