Milwaukee 4274-21 Guide: Capacity, Fit and Buying Checks

What the documented specification tells you

Magnetic lubrication tank in listed kit. A model-specific minimum mounting thickness has not been confirmed here; check the exact operator manual before choosing a workpiece.

• Power: 120V corded; confirm unit nameplate
• Annular diameter: 1.625 inches maximum
• Cutting depth: Not confirmed for this guide
• Speed: 475/730
• Cutter interface: 3/4-inch Weldon quick-change
• Base: permanent

When it belongs on your shortlist

Treat the permanent magnet as a setup characteristic, not an all-purpose recommendation. It changes what happens to magnetic attachment when motor power is interrupted, but the work still needs suitable steel and the prescribed restraint. Compare this model with both the electromagnetic 4272-21 and a cordless permanent-magnet drill if cable access is also a concern.

If the job requires frequent positioning on steel structures, compare the manufacturer's partial-magnet positioning feature with how you normally align holes. The benefit is a workflow question, not a claim of faster cutting. Obtain a demonstration or inspect the controls where possible, especially if the operator must reach them in a constrained position.

The limitation to check first

The marketing statement about holding on 1/4-inch steel is conditional, not a guarantee on every painted, curved or thin workpiece. Obtain the exact US manual before approving a setup at the minimum thickness. Also keep its 1-5/8-inch annular capacity separate from chuck capacity for ordinary drill bits.