Aeronautical Standard Tube Coupling Nut
Item: AN818-4D | Coupling
Thread Class: 3b
Thread Direction: Right-hand
Fabrication Method: Any acceptable
Nut Style: Tube coupling
Nut Height: 0.620 inches nominal
Width Across Flats:
0.563 inches nominal
Length To Shoulder: 0.532 inches nominal
Smallest Inside Diameter: 0.305 inches nominal
Thread Series: Unf
Thready Qty Per Inch (tpi): 20
Thread Size: 0.438 inches
Tube Outside Diameter: 0.250 inches
Criticality Code Justification: Feat
Special Features: Weapon system essential. grumman a-10 aircraft
Material: Aluminum alloy overall
Surface Treatment: Anodize overall