Medium
Less than 15 minutes
This is an OEM sourced replacement part designed for use with Milwaukee drills/drivers. It allows user to secure drill bits. The ratcheting action clicks the jaws tightly into place for reduced bit slippage. If your drill's bit retention is suffering, the rotation feels stiff, or the chuck has seized up entirely, a new chuck should fix the problem. This chuck includes the screws.
Keyless Chuck 42-66-0755
OEM part for: Milwaukee
Part Number: 42-66-0755
$49.55
In Stock
Ships within 1 business day 
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Frequently Purchased Together ?
Compatibility
This part will fit the following 36 machines
Milwaukee
0622-20 (SER 312A) Cordless Drill / Driver View Diagrams & Manuals
0624-20 (SER 321A) Cordless Hammer Drill View Diagrams & Manuals
0235-20 (SER 978A) Electric Drill / Driver View Diagrams & Manuals
0235-21 (SER 056B) Electric Drill / Driver View Diagrams & Manuals
0302-20 (SER 084A) Electric Drill / Driver View Diagrams & Manuals
0302-50 (SER 084A) Electric Drill / Driver View Diagrams & Manuals
0302-55 (SER A03A) Electric Drill / Driver View Diagrams & Manuals
0614-20 (SER 314C) Hammer Driver Drill View Diagrams & Manuals
0615-20 (SER A76A) 14.4 Volt 1/2" Lok-Tor II Driver-Drill View Diagrams & Manuals
0615-20 (SER A76B) 14.4 Volt 1/2" Lok-Tor II Driver-Drill View Diagrams & Manuals
0615-20 (SER A76C) 14.4 Volt 1/2" Lok-Tor II Driver-Drill View Diagrams & Manuals
0625-20 (SER A77A) 18 Volt 1/2" Lok-Tor II Driver-Drill View Diagrams & Manuals
0822-20 (SER A98A) 1/2 " Driver-Drill View Diagrams & Manuals
0617-20 (SER A78A) 14.4 Volt 1/2" Lok-Tor II Hammer Drill View Diagrams & Manuals
0617-20 (SER A78B) 14.4 Volt 1/2" Lok-Tor II Hammer Drill View Diagrams & Manuals
0627-20 (SER A79A) 18 Volt 1/2" Lok-Tor II Hammer Drill View Diagrams & Manuals
0724-20 (SER A55A) Cordless 1/2" Hammer Drill View Diagrams & Manuals
0824-20 (SER A99A) 1/2 " Hammer Drill View Diagrams & Manuals
0613-20 (SER 313A) 14.4V 1/2" Cordless Hammer Drill View Diagrams & Manuals
0614-20 (SER 314A and 314B) 14.4V 1/2" Cordless Hammer Drill View Diagrams & Manuals
0616-20 (SER A02A) 14.4V 1/2" Cordless Drill View Diagrams & Manuals
0624-20 (SER 321B) 18V 1/2" Cordless Hammer Drill View Diagrams & Manuals
0724-20 (SER A55B) Cordless 28V 1/2" Hammer-Drill View Diagrams & Manuals
0824-24 (SER A99A) 18 Volt 1/2" Hammer-Drill View Diagrams & Manuals
0627-24 (SER A79A) 18 Volt 1/2" Lok-Tor II Hammer Drill View Diagrams & Manuals
0617-24 (SER A78B) 14.4 Volt 1/2" Lok-Tor II Hammer Drill View Diagrams & Manuals
0822-24 (SER A98A) 18 Volt 1/2" Driver-Drill View Diagrams & Manuals
0625-24 (SER A77A) 18 Volt 1/2" Lok-Tor II Driver Drill View Diagrams & Manuals
0615-24 (SER A76C) 14.4 Volt 1/2" Lok-Tor II Driver Drill View Diagrams & Manuals
0724-24 (SER A55A) Cordless 28V 1/2" Hammer-Drill View Diagrams & Manuals
2611-20 18 Volt Magnum 1/2" Hammer-Drill View Diagrams & Manuals
2611-24 (SER B54A) 18 Volt Magnum 1/2" Hammer-Drill View Diagrams & Manuals
2610-20 (SER B53A) 18 Volt Magnum 1/2" Driver-Drill View Diagrams & Manuals
2610-24 (SER B53A) 18 Volt Magnum 1/2" Driver-Drill View Diagrams & Manuals
0726-20 (SER C26A) 28 Volt 1/2" Hammer-Drill View Diagrams & Manuals
0726-22 28 Volt 1/2" Hammer Drill View Diagrams & Manuals
Show More Compatible Models
This item works with the following types of products:
- Cordless Drill Parts
- Drill Parts
- Hammer Drill Parts
- Electric Drill Parts
This part replaces obsolete part #: 48-66-1575
Repair Videos ?
Watch the Repair Video for
Keyless Chuck
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September 18, 2009
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August 12, 2010
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Customer Part Reviews ?
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Made my drill like brand new .
Arrived quickly. Great parts. It’s one of many drills I have repaired. It should be the norm to fix rather than toss and buy a new one. My go to to for repairing all my drills.
Thomas -
August 15, 2022
Verified Purchase
Excellent business to purchase parts from
Ordered online and had it in a couple days.
Guest -
October 29, 2019
Verified Purchase
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Customer Repair Instructions ?
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
Needed a new chuck
james - June 23, 2016
👍 6 of 6 people found this instruction helpful
Tool Type
Hammer Drill
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver, Allen wrench,hammer
Parts Used
I watched your YouTube video on how to do this repair. It was very informative and easy to follow, made the job easy. I copied it so others could watch it. Thanks!
https://www.youtube.com/watch?v=usC8unA5RiA
https://www.youtube.com/watch?v=usC8unA5RiA
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Seized chuck
Emmanuel - December 23, 2016
👍 3 of 3 people found this instruction helpful
Tool Type
Cordless Drill
Difficulty
Expert
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Remove the reverse threaded center bolt with a screwdriver
I was able to tighten the chuck down on the small end of an allen wrench
I put the drill in the drill mode and on low speed
Then hit the allen wrench with a hammer to release it from the spindle
Install the new chuck on in reverse order
I was able to tighten the chuck down on the small end of an allen wrench
I put the drill in the drill mode and on low speed
Then hit the allen wrench with a hammer to release it from the spindle
Install the new chuck on in reverse order
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Thanks for voting and helping fellow customers!
Drills loosening up in chuck, and falling out.
Ronald - August 6, 2017
👍 1 of 1 people found this instruction helpful
Tool Type
Cordless Drill
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
, Allen wrench, hammer
Parts Used
Removed the allen screw from the middle of the chuck LH thread, hit then the long end of an allen wrench that was held by the chuck and threaded it off the spindle. Installed the new chuck and screw in the chuck screw.
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old chuck broke
mark - October 30, 2019
Tool Type
Cordless Drill
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
remember left handed threads is it.
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OEM stands for Original Equipment Manufacturer and means the part you’re buying is sourced directly from the manufacturer who made your product. At eReplacementParts, we sell only genuine OEM parts, guaranteeing the part you’re purchasing is of better design and of higher quality than aftermarket parts.
Our product descriptions are a combination of data sourced directly from the manufacturers who made your product as well as content researched and curated by our content & customer service teams. This content is edited and reviewed internally before being made public to customers.
Our customer service team are at the ready daily to answer your part and product questions. We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
All our part reviews are solicited directly from other customers who have purchased this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
Based on data from past customer purchasing behaviors, these parts are most commonly purchased together along with the part you are viewing. These parts may be necessary or helpful to replace to complete your current repair.
All our installation videos are created and produced in collaboration with our in-house repair technician, Mark Sodja, who has helped millions of eReplacementParts customers over the last 13 years repair their products. Mark has years of experience in selling and repairing both commercial and residential products with a specialty in gas-powered equipment.
This data is collected from customers who submitted a repair instruction after replacing this exact part. Customers can rate how easy the repair was to complete and how long it took. We aggregate this data to provide a repair rating that allows customers to quickly determine the difficulty and time needed to perform their own repair.
