Commonly manufactured from Stainless Steel (CRES) or Aluminum Alloy . Aluminum variants are often anodized per MIL-A-8625 Type II for corrosion resistance.
: It is currently classified as a Historical Standard . Since July 2008, it has been inactive for new designs, though it remains widely used for maintenance, repair, and replacement in existing aircraft and military equipment. Key Specifications as33514
Here are the key details:
Standardized assembly torque is required to prevent leaks, deformation, or galling. For example, a -4 size fitting typically requires a torque of 180 pound-inches . or galling. For example