NAS1352-04-16P

The NAS1352-04-16P is a precision fastener manufactured to National Aerospace Standards (NAS). It is a steel screw with a cadmium and chromate surface treatment per Class 2 Federal Specification QQ-P-416. The screw features a 4-40 UNRC thread with a 3A class tolerance, right-hand direction, and a thread length of 0.750 inches. The overall fastener length is 0.970 to 1.000 inches (63/64 inch). The head style is flat chamfer with a hexagon internal drive, providing secure engagement with a hex key. The head diameter ranges from 0.176 to 0.183 inches, head height from 0.108 to 0.112 inches, and width across flats from 0.094 to 0.095 inches. The screw is made from steel with a minimum yield strength of 155,000 psi and minimum tensile strength of 180,000 psi. The hardness rating is 38.0 to 45.0 HRC. This fastener is designed for high-strength applications in aerospace and industrial settings where reliable threaded fastening is required. The cadmium/chromate coating provides corrosion resistance. The part is part of the NAS1352 series and is specified under NAS specification 80205. This screw is typically used in assemblies requiring a flush or low-profile head with a hex socket drive. The precise dimensional tolerances ensure consistent performance.