The code clarifies if the rivet is a universal head (protruding) or countersunk (flush).
The "Top" position of the NAS523 symbol is the most critical. It typically indicates the or the specific material and type of the fastener.
To help you find the exact fastener specs or torque values you need: nas523 pdf top
Specify if you're working on a (like Boeing or Airbus).
5056 Aluminum Alloy (Used primarily with magnesium structures). KE: 7050 Aluminum Alloy. Why You Need the Official PDF The code clarifies if the rivet is a
When you download a NAS523 PDF, you will find a table of letter codes that correspond to specific alloys. Some of the most common include: 2117 Aluminum Alloy (The most common structural rivet). D: 2017 Aluminum Alloy. DD: 2024 Aluminum Alloy.
Denote the length and whether the fastener is driven on the near or far side. Common NAS523 Material Codes To help you find the exact fastener specs
While many online summaries exist, the official is essential for several reasons:
Mention if you need or material substitutions.
Tell me the (like BJ, AD, or KE) you're looking up.