Screw, Machine, Flat Countersunk Head NAS4403-6

Technical Description

High-strength precision alloy steel structural machine screw manufactured to NAS4403 technical parameters. Thread metrics follow a right-hand #10-32 UNJF-3A close-tolerance fit class featuring a nominal grip length of 0.375 inches and an overall length of 0.698 inches. Constructed from premium vacuum-melted high-tensile alloy steel providing a minimum tensile strength rating of 160,000 to 180,000 PSI to handle critical shear and structural joint preloads. Outfitted with an aerodynamically flush 100-degree reduced flat countersunk head utilizing a high-torque internal Tri-Slot recess drive system to withstand high assembly preload requirements without driving slip or damage. Finished with a yellow chromate over cadmium plating per AMS-QQ-P-416 Type II Class 2 to ensure maximum galvanic isolation and long-term corrosion resistance in critical airframe load joints.

Component Specifications