Easy
Less than 15 minutes
Genuine Makita replacement part used on Angle Grinders and Plate Joiners. This Wrench allows you to secure a Cutter Blade or a Grinding Wheel to the tool. Angular profile of this item makes tightening/loosening the lock nut easy, as it stands off from the disc. This wrench is made from Metal and it is Sold Individually.
Please be aware that this wrench will not fit the 5/8" lock nut. You need a separate wrench for the 5/8" lock nut.
Lock Nut Wrench 782401-1
OEM part for: Makita
Part Number: 782401-1
$13.11
In Stock
Ships within 1 business day 
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Product Description ?
- Classification: Accessory
- Weight: 0.19 lbs.
- Shipping: Ships Worldwide
Frequently Purchased Together ?
Compatibility
This part will fit the following 10 machines
Makita
3901 Plate Joiner View Diagrams & Manuals
N9514B Grinder View Diagrams & Manuals
9501B Grinder View Diagrams & Manuals
PC1100 Concrete Planer View Diagrams & Manuals
9514B Disc Grinder View Diagrams & Manuals
9523NBH Angle Grinder View Diagrams & Manuals
N9501BZ Disc Grinder View Diagrams & Manuals
PJ7000 Plate Joiner View Diagrams & Manuals
9501BKIT Grinder View Diagrams & Manuals
XJP03Z Misc View Diagrams & Manuals
Show More Compatible Models
This item works with the following types of products:
- Plate Joiner Parts
- Grinder Parts
- Planer Parts
Customer Part Reviews ?
Average Rating (out of 5):
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4 stars
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The right part
Received the right part
Guest -
June 13, 2023
Verified Purchase
Fit and worked
Locknut wrench fit the lock nut on my Makita 4” grinder perfectly.
Guest -
January 14, 2023
Verified Purchase
great service
Fast shipping. Great product
Frank -
May 15, 2021
Verified Purchase
Great part
New part. Kinda slow and expensive delivery in this age. But, it did the job...
Norman -
July 14, 2020
Verified Purchase
Worked as expected
Worked as expected nice heavy tool got here fast will order again from this co
Guest -
April 11, 2020
Verified Purchase
Hard to find handle
You made my day when I seen the handle, I didn’t want to buy a new saw. Couldn’t be more happier. Thank you, for the fast service. 🙂
Guest -
November 13, 2019
Verified Purchase
Needed Tool
The wrench is exactly what I needed to change a sanding disk on my grinder.
Guest -
August 15, 2019
Verified Purchase
Great part, fast service
Part just as ordered, could not source locally
Guest -
July 2, 2019
Verified Purchase
The 10mm of grinder wrenches
The wrench was a match just like it came from the factory.
Sean -
June 27, 2019
Verified Purchase
Long lost friend
Had my Makita many years and lost my wrench to change wheel. Thank you for your replacement.
Guest -
June 11, 2019
Verified Purchase
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t -
t days ago
Verified Purchase
eReplacementParts Team
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Questions & Answers ?
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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.
Wheel cover was missing and needed new wrenches
ben - January 16, 2017
👍 1 of 1 people found this instruction helpful
Tool Type
Grinder
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Removed the grinding disk and lined up the wheel cover and put the screws in. And used my new wrenches. Thank you.
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Old wrenches were barely usable
WG - December 20, 2015
👍 2 of 3 people found this instruction helpful
Tool Type
Grinder
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Wrench Set
Parts Used
Parts ordered and used the wrenches, worked great
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Lock nut on cutting wheel on grinder was seized up.
Raymond - January 30, 2023
Tool Type
Grinder
Difficulty
Medium
Time
15-30 minutes
Tools Used
, Pipe Wrench
Parts Used
Tried to use lock nut wrench that came with grinder to loosen lock nut, put could not move it and actually bent the wrench, I ended up using o pipe wrench to break the lock nut free. I therefore had to replace the wrench and lock nuts.
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Needed new blade but tool was lost for changing it
Verna - March 9, 2022
Tool Type
Grinder
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
, Grinder blade/wheel changing tool
Parts Used
Took off old grinder wheel put on new one
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Thanks for voting and helping fellow customers!
Had lost lock nut wrench
Bonnie - February 20, 2019
Tool Type
Grinder
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Parts Used
After receiving lock nut wrench, able to complete job
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Thanks for voting and helping fellow customers!
Missing parts for changing grinding accessories
Robert - November 8, 2018
Tool Type
Grinder
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Wrench Set
Parts Used
The tools provided by eReplacement Parts were perfect to get the job done. Thanks very much
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I needed a replacement handle and had lost the wrenches needed to change discs easily.
Robert - October 24, 2018
Tool Type
Grinder
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
These parts were direct replacements and worked as designed. Thanks
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Lost original wrenches for removing discs
Tommy - March 5, 2018
Tool Type
Grinder
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
, The tools I bought
Parts Used
Replaced the worn out disc
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Rusted bolts and screws
Philip - December 21, 2017
Tool Type
Grinder
Difficulty
Medium
Time
30-60 minutes
Tools Used
Power Drill, Socket set, Nutdriver
Parts Used
Had to cut rusted bolts and screws that anchored storm shutter track.I needed the lock nut wrench's to replace a stone cutting blade with a metal cutting blade. Wrenches were lost when I loaned my Makita grinder to someone. I broke my own rule never to loan anything with moving parts.Thank you replacement parts . P. R.
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Just missing tools to unlock the disc from the grinder.
Randal - October 10, 2017
Tool Type
Grinder
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Wrench Set
Parts Used
Unlocked the disc with the new wrenches and installed the new grinder disc.
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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.
