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The symbol consists of a central crosshair forming four distinct quadrants. While the compass directions (Northwest, Northeast, Southwest, Southeast) are never explicitly written on the drawing, the layout always follows this strict orientation: Quadrant Location Technical Designation Data Contained Northwest (NW) Fastener Basic Code & Material (e.g., BJ, BB) Top-Right Northeast (NE) Shank Diameter & Manufactured Head Location (Near/Far) Bottom-Left Southwest (SW) Hole Preparation Code (Countersink/Dimple) Bottom-Right Southeast (SE) Fastener Length (measured in -inch increments) Deep Dive: Deciphering Each Quadrant 1. Top-Left (NW): Fastener Type and Material

1. Northwest Quadrant (NW): Fastener Part Number and Material

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The system defines a method of using coded symbols on the drawing to indicate:

Leading companies are now:

The NE quadrant states the body diameter of the rivet shank, usually measured in increments of 1/32 of an inch. Right next to the size, it lists a letter denoting the position of the manufactured head:

For example, the diameter code consists of one to two digits—for rivets, this is measured in 1/32nd-inch increments. The symbol consists of a central crosshair forming

Rivet diameter and the side of the sheet for the manufactured head ( Lower Left Specialized installation requirements like countersinking Lower Right Fastener length in increments (e.g., -6 for 3/8"). 🏗️ Technical Implementation Details

Disclaimer: This article does not host copyrighted PDFs. It guides you to legal, authoritative sources. Northwest Quadrant (NW): Fastener Part Number and Material