Easy
Less than 15 minutes
This is an authentic manufacturer-sourced replacement component that is specially designed for use with Milwaukee sanders. It helps to provide an air-tight seal between connected parts, please make sure to refer to refer to the appropriate diagrams of your model for the correct location and application of this hardware. Keep in mind this high-quality item is made of durable rubber and is sold individually.
O-ring 34-40-1870
OEM part for: Milwaukee
Part Number: 34-40-1870
$4.99
In Stock
Ships within 1 business day 
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Compatibility
This part will fit the following 3 machines
Milwaukee
6020-21 (SER B18A) 1/4" Sheet Palm Sander View Diagrams & Manuals
6021-21 (SER B19A) 5" Random Orbit Palm Sander View Diagrams & Manuals
6020-21 (SER B18B) 1/4 Sheet Palm Sander View Diagrams & Manuals
This item works with the following types of products:
- Sander Parts
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eReplacement is great. The diagrams make it simple to figure which part you need. Everything arrives quickly so there's little down time.
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July 20, 2019
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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.
Vibration, pad not holding paper
Anthony - May 18, 2023
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver, Power Drill
took the tool apart, installed new parts , worked great
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Orbital Sander brake was not working
James - September 11, 2020
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver, Torx screwdriver
Removed pad and side panel of body case, removed old brake and replaced. Very easy repair if you have the right size torx screwdriver. Also replaced dust bag and o-ring.
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missing dust collector
William - April 9, 2019
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
, hands
put together new bag
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My dust bag from sander went thru dust collector and rip it threads.
bernard - April 9, 2019
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Install bag, spring, & o-ring to locking ring.
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Dust collector ate the bag from my portable sander!
Robert - May 15, 2017
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Install the o-ring on the dust chute
Then put the spring in the dust bag
Attach the dust bag to the bag locking ring
Then attach it to the dust chute
Then put the spring in the dust bag
Attach the dust bag to the bag locking ring
Then attach it to the dust chute
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Locking bag ring and dust chute were worn and wouldn't stay on.
William - February 11, 2017
Tool Type
Sander
Difficulty
Easy
Time
15-30 minutes
Tools Used
Pliers, Hack saw
Removed the dust chute, had to cut it with a saw to release it off the sander. Then its just a matter of putting the bag on the ring with the spring inside. slide the new chute on the sander.
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My random orbital sander was running full bore, no randomizing.
Cody - May 23, 2016
Tool Type
Sander
Difficulty
Medium
Time
15-30 minutes
Tools Used
Screwdriver
Remove the pad. Remove the bearing/pad mounting bracket. There is a screw with a collar that hold the bearing against the drive spindle. Also use a small flat top screw driver through one of the vent holes in between the fins of the suction to keep the spindle from turning so that you can remove the hold down screw. Place the bearing plate on two small pieces of wood with the center open, take a socket that will fit in the center hole and cover most of the exposed bearing. Using a hammer, drive the old bearing out. Insert the new bearing in the recessed location, using the hammer tap around the plate to seat the bearing flush with the mounting plate. It has to be flush or the pad won't align properly. The rest kind of depends on the make and model of your sander.
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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.
