Home SPO TVBeginner's Guide to Serging How to Change Serger Knives

How to Change Serger Knives

by Sarah

Are you ready to show your serger some TLC? In this video, we teach you how to change the upper knife and lower knife of your Serger.

Sergers, also known as Overlockers, are loved for their ability to quickly trim raw ends. Unlike sewing machines, sergers have two built-in “knives”. These razor-sharp blades are strong enough to cut through thick denim, yet gentle enough to shave fine chiffon. However, they’ll eventually become dull. If you see the fabric edges fraying slightly, despite being freshly serged, it’s time to change the knives.

Generally, if you serge everyday, expect to replace your knives every 2 to 3 months. Again, this is a judgement call. Keep in mind, stock blades are likely made of steel and thus not the highest quality. Our technicians prefer serger knives made of Carbide, as they last longer and preform better.

Serger knives are machine specific, so make sure to search our website by model number or give our customer service a call. We’re happy to help!

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Kaylee February 3, 2020 - 12:29 pm

I have a Brother SB3734T and it needs new blades. What blades do I need? Thanks!

CustomerService February 7, 2020 - 9:38 am

Hello Kaylee!

I have been unable to pull up guaranteed blades; however, oftentimes, a part number is stamped on the original blade. If you are able to obtain those numbers, please give us a call and we will be happy to see if we carry them!

Carolyn May 16, 2019 - 1:02 pm

I am looking for a replacement knife for a singer serger model 14U 34/234B. This machine is over twenty years old but still working well. Do you carry this knife? Thanks.

CustomerService May 21, 2019 - 1:14 pm

Hello Carolyn!

The knives noted for the Singer 14U34 can be found via the link: https://www.sewingpartsonline.com/upper-and-lower-knife-set-singer-kk-sing2.aspx

Sheila Fuhrmann January 24, 2019 - 7:23 am

I have a Brother 3034D that I bought in ’09.. It is time to change the blades. Which blades do I need? Thank you for your help

CustomerService January 24, 2019 - 2:09 pm Reply
Kathi Cooper November 19, 2017 - 1:10 pm

Where can i get replacement blades for the overlock with side arm attachement for a Brother sewing machine. Low profile

Sarah November 20, 2017 - 1:04 pm

Hi! What is the model number of your overlocker?


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