Milwaukee
Milwaukee Tool 1/2" - 20" KEYED CHUCK
- SKU:
- MLW48-66-1355
- Availability:
- Usually Ships Same Day
- Weight:
- 1.05 LBS
Description

DUTY®
1/2 in Capacity
Keyed Drill Chuck
Fit the keyed chuck to a matching threaded drill spindle.
Product Overview
This 1/2 in keyed drill chuck uses the 1/2 in–20 mounting connection. Match both the chuck capacity and spindle interface to the drill.
The specified chuck key is 48-66-3280, with holder 48-66-4040. Check the listed supply details and the drill’s service information before replacing the chuck.
- Keyed jaw adjustmentUse the specified chuck key to tighten the bit.
- Defined mounting fitMatch the spindle connection, not capacity alone.
- Service replacementReplace the chuck on an approved drill setup.
- Key-holder pairingThe listed holder keeps the matching key with the tool.
Technical Specifications
- Model
- 48-66-1355
- Chuck capacity
- 1/2 in
- Mounting connection
- 1/2 in–20
- Chuck type
- Keyed
- Chuck key
- 48-66-3280
- Key holder
- 48-66-4040
Choose the Correct Fit
Confirm the drill permits a 1/2 in keyed chuck and uses the specified 1/2 in–20 spindle-mounting connection.
Check the tool’s service information for its catalog and serial number before changing the chuck.
Installation & Care
Disconnect the power source before installation. Follow the drill’s chuck-removal and attachment procedure.
Inspect the jaws and key for wear, tighten the bit as instructed and always remove the chuck key before starting.
Small Details. Big Jobsite Energy.
Get set. Stay focused. Make your next move count.
THE NEXT JOB.
Ask Willy:
Need help comparing this item? Share model 48-66-1355 and the application or specification you want to confirm.
Important Product Questions
What key is specified?
Use chuck key 48-66-3280; the matching key holder is 48-66-4040.
Is capacity the same as mounting size?
No. Bit capacity is 1/2 in; the spindle mounting connection is 1/2 in–20.
What should I check before ordering?
Match the drill’s specified replacement chuck, spindle connection and permitted capacity.