This quadrant uses a two-letter code to represent the industry specification (like Military Standards (MS) or National Aerospace Standards (NAS) ) and the material alloy. BJ: MS20470AD (Universal head, 2117 aluminum). BB: MS20426AD (100° Countersunk head, 2117 aluminum). 2. Northeast (NE): Diameter & Head Side
Using the NAS523 system ensures that structural integrity is maintained across different aircraft components. Technicians can quickly reference guides like the NAS523 Identification Guide PDF or Solid Rivet Specifications to ensure they are using the correct alloy—such as "icebox" rivets (D and DD) which require heat treatment and freezing before installation.
The symbol consists of a central cross whose intersection marks the exact location of the rivet on the drawing. Information is coded into four quadrants around this intersection: Information Provided Upper Left Rivet Identity (Part Number & Alloy) BJ (MS20470AD), BB (MS20426AD) NE Upper Right Diameter and Manufacturing Head Location 3N (3/32" diameter, head on Near side) SW Lower Left Hole Preparation (Dimple/Countersink) D (Dimple), C (Countersink), D2C SE Lower Right Rivet Length -5 (5/16"), -6 (3/8") Deep Dive into the Quadrants 1. Northwest (NW): Rivet Identity nas523 rivet code pdf
Crucial for flush-head installations, this section specifies how the metal sheets should be prepped. Dimpled. C: Countersunk. D2C: Dimple the top two sheets and countersink the third. 4. Southeast (SE): Rivet Length Length is indicated in increments of 1/16th of an inch . A -6 code represents a rivet length of 6/16", or 3/8".
The head is on the side of the metal closest to the person reading the drawing. F (Far Side): The head is on the opposite side. 3. Southwest (SW): Hole Preparation This quadrant uses a two-letter code to represent
For countersunk rivets, the length includes the head; for universal head rivets, it includes only the shank. Why This Matters for Technicians
For further technical details or to see specific material charts, you can consult the full NAS523 Standard Practice document or educational resources from platforms like Scribd and StudyLib . The symbol consists of a central cross whose
NAS523 Rivet Identification Guide | PDF | Rivet | Sheet Metal - Scribd
This quadrant uses a two-letter code to represent the industry specification (like Military Standards (MS) or National Aerospace Standards (NAS) ) and the material alloy. BJ: MS20470AD (Universal head, 2117 aluminum). BB: MS20426AD (100° Countersunk head, 2117 aluminum). 2. Northeast (NE): Diameter & Head Side
Using the NAS523 system ensures that structural integrity is maintained across different aircraft components. Technicians can quickly reference guides like the NAS523 Identification Guide PDF or Solid Rivet Specifications to ensure they are using the correct alloy—such as "icebox" rivets (D and DD) which require heat treatment and freezing before installation.
The symbol consists of a central cross whose intersection marks the exact location of the rivet on the drawing. Information is coded into four quadrants around this intersection: Information Provided Upper Left Rivet Identity (Part Number & Alloy) BJ (MS20470AD), BB (MS20426AD) NE Upper Right Diameter and Manufacturing Head Location 3N (3/32" diameter, head on Near side) SW Lower Left Hole Preparation (Dimple/Countersink) D (Dimple), C (Countersink), D2C SE Lower Right Rivet Length -5 (5/16"), -6 (3/8") Deep Dive into the Quadrants 1. Northwest (NW): Rivet Identity
Crucial for flush-head installations, this section specifies how the metal sheets should be prepped. Dimpled. C: Countersunk. D2C: Dimple the top two sheets and countersink the third. 4. Southeast (SE): Rivet Length Length is indicated in increments of 1/16th of an inch . A -6 code represents a rivet length of 6/16", or 3/8".
The head is on the side of the metal closest to the person reading the drawing. F (Far Side): The head is on the opposite side. 3. Southwest (SW): Hole Preparation
For countersunk rivets, the length includes the head; for universal head rivets, it includes only the shank. Why This Matters for Technicians
For further technical details or to see specific material charts, you can consult the full NAS523 Standard Practice document or educational resources from platforms like Scribd and StudyLib .
NAS523 Rivet Identification Guide | PDF | Rivet | Sheet Metal - Scribd