Can I ʼlockʼ a specific object so it cannot be moved in AutoCAD?

Short Answer

No—AutoCAD does not have a true per-object “lock” that prevents a single object from being moved independently of everything else. The most common professional method is to place that object on its own layer and lock the layer with LAYLOCK. The limitation is that this affects every object on that layer, not just one item.

What You Need to Know Before

Warning: If the object shares a layer with other geometry, locking that layer will also prevent those other objects from being edited normally. A common failure is trying to “lock” one block or line without first isolating it onto its own dedicated layer.

How to Lock It Using the Standard Method

Command: LAYLOCK
Shortcut: LA, then lock the layer in layer properties Manager
Quick Steps:
1. Move the object to its own layer if needed: select the object, then go to the Ribbon > Home tab > layers panel and change its layer in the Layer drop-down.
2. Start LAYLOCK, then click the object’s layer or lock it from Layer Properties Manager.
3. Confirm the layer shows as locked; optionally keep Locked layer fading visible so locked objects appear dimmed on screen.

Variables & Settings

System Variable: LAYLOCKFADECTL (Default: 50)
Expert Setting: This controls how faded locked-layer objects appear. A higher value makes locked objects more obviously protected, which helps prevent accidental selection attempts during editing.

Why it Fails

Cause 1 (Geometry): The object is part of a block definition, so locking the layer may not behave as expected if you are editing the block internally with BEDIT or REFEDIT.
Cause 2 (Layers/Locks): The object is on a shared working layer, so locking it also locks other unrelated objects and disrupts drafting.
Cause 3 (Command/Logic): AutoCAD layer locking reduces editing access, but it is not a true object-level lock feature for individual lines, polylines, or blocks.

Best Practice

Quick Fix: Use CHPROP or the Properties palette to move the object onto a dedicated layer, then run LAYLOCK.
Manager’s Verdict: In real production drawings, lock by layer—not by object. If one item must stay fixed, give it a dedicated protection layer; avoid overusing this for active design geometry that still needs frequent revision.