Details special installation methods . This often includes instructions for dimpling ("D") or countersinking ("C").
. For instance, "D2C" means dimple two top sheets and countersink the third. Southeast (SE - Bottom Right): Specifies the fastener length or grip, often in inch increments. Key Identification Resources nas523 pdf top
The NAS523 standard, often referred to as the is a foundational document used in the aerospace and defense industries. It provides a universal coding system that allows engineers and technicians to identify the characteristics of a fastener (type, diameter, length, material, and finish) through a standardized shorthand. 🔩 What is NAS523? Details special installation methods
The NAS523 standard specifically calls for , making it distinct from alloy steel bolts that require cadmium plating. nas523 pdf top