How to Draw a Bolt in AutoCAD: Step-by-Step Guide

To draw a bolt in AutoCAD, start by using the LINE and CIRCLE commands to create the bolt's shaft and head. Then use POLYGON for the hexagonal head and ARRAY or HELIX to simulate threads if needed.

Syntax

Here are the main AutoCAD commands used to draw a bolt:

• LINE: Draw straight lines for the bolt shaft.
• CIRCLE: Create circular shapes for the bolt head or shaft ends.
• POLYGON: Draw a hexagonal bolt head by specifying 6 sides.
• ARRAY: Duplicate thread shapes around the shaft.
• HELIX: Create a spiral to represent threads.

plaintext

LINE
CIRCLE
POLYGON
ARRAY
HELIX

Example

This example shows how to draw a simple bolt with a hexagonal head and a cylindrical shaft:

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1. Use <code>POLYGON</code> command:<br>- Type <code>POLYGON</code> and press Enter.<br>- Enter <code>6</code> for sides.<br>- Specify center point.<br>- Choose 'Inscribed in circle' and enter radius (e.g., 10 units).<br>2. Use <code>LINE</code> command:<br>- Draw a vertical line from the center of the polygon downwards for the shaft length (e.g., 50 units).<br>3. Use <code>CIRCLE</code> command:<br>- Draw a circle at the bottom of the shaft line to represent the bolt end.<br>4. (Optional) Use <code>HELIX</code> to create threads:<br>- Type <code>HELIX</code>, specify base radius, top radius, height, and turns.<br>5. Use <code>3DORBIT</code> to view the bolt in 3D.

Output

A 2D hexagonal bolt head with a vertical shaft line and optional 3D thread spiral.

Common Pitfalls

• Not specifying the correct number of sides for the bolt head polygon (should be 6 for hex bolts).
• Forgetting to use 'Inscribed in circle' option when drawing the polygon, which affects size accuracy.
• Ignoring scale and proportions between head size and shaft length.
• Trying to draw threads manually with lines instead of using HELIX or arrays, which is inefficient.

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Wrong way:
POLYGON
5
(center)
Inscribed
10

Right way:
POLYGON
6
(center)
Inscribed
10

Quick Reference

Command	Purpose	Notes
LINE	Draw shaft and bolt edges	Use for straight parts
CIRCLE	Draw bolt ends or shaft cross-section	Specify center and radius
POLYGON	Draw hexagonal bolt head	Set sides to 6 for hex bolt
HELIX	Create thread spiral	Set radius and turns for threads
ARRAY	Duplicate thread shapes	Use polar array around shaft

Key Takeaways

Use POLYGON with 6 sides to create an accurate hexagonal bolt head.

Draw the bolt shaft with LINE and CIRCLE commands for simple shapes.

Use HELIX or ARRAY commands to efficiently create bolt threads.

Maintain correct proportions between bolt head size and shaft length.

Avoid manual thread drawing to save time and improve accuracy.