Easy
Less than 15 minutes
This is high-quality OEM supplied part which is specially designed for use with Husqvarna and Jonsered handheld lawn and garden equipment. It is an identical replacement for a missing or damaged locknut that was originally installed on a new unit. The purpose of this hardware is to secure the cutting blade. Note, it is a nut that resists loosening under vibrations and torque. Please make sure to refer to the owners manual and the appropriate diagrams of your model for the correct application of this component. Keep in mind this high-quality locknut is made of durable metal and is sold individually. You will need a wrench to secure or remove it.
Locknut 12x1.75 537543901
OEM part for: Husqvarna
Part Number: 537543901
$7.46
In Stock
Ships within 1 business day 
Compatibility
This Locknut 12x1.75 will fit the following 193 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
Displaying 20 of 193 matching models.
Husqvarna
Show More Compatible Models193 total model matches. Try the above search to narrow your results.
This is the official OEM part for the following brands:
- Husqvarna
- Jonsered
This item works with the following types of products:
- Trimmer
This part replaces obsolete part #: 502045501 (R), 502045501, 5020455-01
Questions & Answers ?
Our customer Service team is at the ready daily to answer your part and product questions.
Ask our Team
We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
Does this fit my product?Questions & Answers for Locknut 12x1.75
No questions have been asked yet
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.
Lost the nut off trimmer steel blade.
Frank - July 12, 2016
👍 2 of 2 people found this instruction helpful
Tool Type
Trimmer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Socket set
Parts Used
Screwed the left hand threaded nut onto the drive shaft.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Nothing
John - September 19, 2019
Tool Type
Trimmer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, None
Remove the handle and place the new trigger switch in place then retighten the screws
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Lock nut that holds brush cutting blade was missing.
Harris - November 17, 2017
Tool Type
Trimmer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Socket set
Parts Used
Installed brush cutter blade, retaining washer and installed locking but purchased from this website. Had tried to purchase locally with no success.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
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.
Learn MoreOur 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.
