How to Choose a Serger or Overlocker: 21 Factors to Consider (+ Checklist)

I remember when I was looking for a serger years ago, I was completely overwhelmed.

There were so many options. And all those serger features were hard to understand.

I wrote this article to help you choose your serger or overlocker. Learn what features you actually need.

(Ps. a serger and an overlocker are the same machine, just 2 different names).

This guide includes:

  • Advice from industry specialists like technicians and serger salespeople.
  • Serger features explained simply with pictures and videos.
  • A free printable checklist.

You can pin this article to bookmark it for later:

how to choose a serger

Contents list:

Related article: Different types of serger stitches – explained simply for beginners.

Related article: 5 Best Overlockers, According to Industry Experts

Download Free Serger Checklist

A checklist of features to look for in a serger or overlocker. Avoid investing in a machine that isn’t right for you. Download it here.

“What overlocker / serger features should I look for?”

Which of these stories sounds most like you?

  1. “I only need a basic serger to finish off raw edges. I mostly sew with light to medium weight woven fabrics. I sew occasionally.” (Yes, this is me).
  1. “I love experimenting. I sew with wovens, stretchy knits and thick fabrics. I want more than the basic overlock stitch. I want athletic flatlock stitches on my sportswear. I want rolled hems on my chiffon dresses. I sew regularly.” (Yes, this is me).
  1. “I want the easiest to use serger on the market. I struggle with threading and choosing the right tension settings. I sew regularly.” (Yes, this is me).

“I only need a basic serger”

If you picked number 1, you probably suit a budget model.

You just need the main overlock stitch. You don’t work with tricky fabrics. And you won’t put your serger under pressure with heavy use.

Look for these features:

  • 3 and 4 thread stitch ability. This will give you the main overlock stitches.
  • Easy to thread. You’ll want color-coded threading diagrams printed on the machine, and an easy to thread lower looper.
  • Differential feed to stop fabric stretching out or puckering.
  • Retractable cutting knife so you can serge without cutting.
  • Adjustable stitch length and width.
  • Recommended: a waste bin to catch fabric fibres. Serging is messy!
  • Recommended: a free arm for sewing tubes of fabric. You can sew tubes without this, you’ll just have to learn a different technique.

Most modern sergers have these features.

However, many budget models don’t have a waste bin included, and some models don’t have a free arm.

Watch out for older sergers that have a harder to thread lower looper. I highly recommend avoiding these.

Serger / overlocker suggestions:

  • The Brother range is my favorite brand for budget overlockers. They have one of the best threading systems I’ve seen (for manually threaded machines) – so important. Here’s my review on the best model to get, and alternatives if it’s unavailable.

Avoid these sergers / overlockers:

  • Janome 9300dx, 9200d and 8002dg (my review post). They have an outdated lower looper design that’s much harder to thread.
  • Singer machines (my review). I spoke to multiple industry experts, including a technician, and they were all very negative about the build quality of this brand.
  • Cheap department store overlockers. A technician told me these are badly made. Think Aldi, Lidl, and John Lewis (for UK shoppers).

“I love experimenting”

If you picked number 2, you probably suit a mid-range or premium serger.

You sew regularly and with some difficult fabrics, so you’ll want to invest in a better-built machine.

You like experimenting, so you’ll want the ability to do 2, 3 and 4 thread stitches, not just 3 and 4 thread stitches.

Look for these features:

  • The features mentioned in the “basic” section above, plus:
  • 2, 3 and 4 thread stitches. This will let you create more stitches, like the 2 thread overlock, 2 thread mock flatlock, and 2 thread rolled hem.
  • More serger feet to create more effects.
  • An extension table for when you’re serging big projects. It’s not essential though.
  • Better build quality. You’ll need a more durable machine with more motor power. Avoid budget sergers.
  • Easy rolled hem conversion, so you can switch from overlocking to rolled hemming quickly.
  • Adjustable pressure. Ideally a user-friendly dial with numbers or markings, not a screw.
  • High presser foot lift for serging thick fabrics. Ideally 5 – 6mm, but even 4mm will fit a lot underneath.

Serger / overlocker suggestions

“I want the easiest serger”

If you picked number 3, you’ll want to look at the premium market.

You’re looking for a serger that threads itself at the push of a button. Maybe you want it to automatically choose the tension settings for you.

The time these features will save you is worth the extra expense.

At this level, it’s safe to assume that all the sergers you look at will be well-built.

Look for these features:

Serger / overlocker suggestions:

Other features to consider:

How often do you sew?


If you sew daily, I highly recommend paying attention to build quality. This is how well or poorly the serger has been made.

brother 1034d serger internal frame
Internal frame of a serger. Photo credit: BP Sewing Machine (Youtube)

I learned from technicians that mass-manufactured, cheap sergers are made with:

  • More plastic inside.
  • Weaker metals.
  • Weaker motors, which means less power.
  • More “relaxed” quality control during manufacturing. Manufacturers won’t mind if the parts don’t fit together tightly, or if the metals don’t meet a certain standard.

All of these compromises add up to create a poorer quality product.

If you sew daily, you will wear out a budget serger faster than others. I definitely recommend spending a bit extra for a longer-lasting machine.

I learned from a technician that mid-range and premium sergers are “more substantial machines”.

If you want to learn more, I have a separate article on how to spot good quality sergers and overlockers.


If you only sew on occasion, a budget serger will normally be fine. You won’t be putting it under much pressure.

Do you sew with thick fabrics like denim and canvas?

serging black denim fabric

If yes, look for:

  • High presser foot lift. Ideally 5 – 6mm, but even 4mm will fit a lot underneath.
  • Adjustable pressure. Ideally a user-friendly dial with numbers or markings, not a screw.
  • More motor power and a better-built machine. Avoid budget sergers.

High presser foot lift

presser foot lift measured on brother 4234d overlocker

You’ll want a high presser foot lift for serging thick layers.

4mm is high enough to fit 8 layers of mid-weight denim underneath, so that’s probably fine for most people.

But I have seen sergers that can go up to 5 – 6mm for more space.

Adjustable pressure

adjustable pressure dial on serger

You’ll need it to create more pressure to feed thick fabric through the machine, and reduce the pressure for very light fabrics.

Most modern sergers have adjustable pressure.

However, many have a screw to let you change the pressure. These are harder to adjust than a simple numbered dial. A screw is unmarked, so it can be tricky getting back to normal pressure.

Better build quality & more power

brother 4234d overlocker metal internal parts

Serging thick materials puts pressure on the machine.

You’ll want a serger with more motor power and stronger construction so it can handle this.

You’re more likely to find this in a mid-range or premium serger.

I have a separate article about good quality sergers if you want to learn more.

However, all domestic sergers have a limit, even the premium ones.

The limits of domestic sergers

A technician told me that domestic sergers are designed for 3 or 4 layers of fabric.

Going over 4 layers of denim at the seams every now and then is fine, but you wouldn’t want to be sewing long stretches of 4+ layers of denim regularly.

You will wear out any domestic serger with this kind of use.

If you need to do it, look at industrial sergers instead. They are designed for hours of daily use in factories. They have the power, knives, and build-quality to handle it.

Do you have eyesight issues that make threading hard?

There are 2 areas you’ll need to thread on a serger: the needles and loopers.

If you have eyesight issues, I highly recommend buying a serger with:

  • A built-in needle threader. This will save you from trying to poke a thread through the eye of a needle.
  • Air-threaded loopers, if you have the budget. This will let you thread the loopers by pressing a button. That’s it!

Needle threaders

serger needle threader

Built-in needle threaders are hard to find on budget models. Expect to buy a mid-range serger.

Looper air threading

With the push of a button, you can thread the loopers with a whoosh of air. It literally takes seconds.

This feature is only found on premium sergers.

Serger and Overlocker Features Explained

Contents list:

  1. 2/3/4/5 thread sergers.
  2. Adjustable pressure.
  3. Adjustable stitch length and width.
  4. Air threading.
  5. Automatic tension.
  6. Differential feed.
  7. Easy lower looper design.
  8. Easy rolled hem conversion.
  9. Easy to thread.
  10. Free arm.
  11. High presser foot lift.
  12. Needle threader.
  13. Retractable cutting knife.
  14. Spreader (or 2 thread converter).

2/3/4/5 thread sergers:

4 thread serger

3/4 thread sergers

Most budget sergers can only do 3 or 4 thread stitches.

For most people, this is all you’ll need.

2/3/4 thread sergers

Mid-range and premium sergers normally let you do 2 thread stitches too.

This gives you more stitch options to play with, like the 2 thread overlock, 2 thread rolled hem, and 2 thread mock flatlock.

You can’t add this feature later, so now is the time to consider it.

5 thread sergers?

There’s some confusion online about 5 thread sergers.

Generally, you can’t buy a domestic 5 thread serger (industrial sergers are a different story).

I have looked at every major manufacturer’s website in the US and UK (Elna, Brother, Janome, Pfaff, Juki, Singer, Bernina, and Husqvarna).

Today it’s just 4 thread sergers on sale, and in the past there were 3 thread sergers.

If you see a “serger” with more than 4 threads, it’s nearly always a combination machine that combines a serger with a coverstitch machine.

Coverstitches are normally used to hem stretch garments. If you want to do this too, you might want to consider a combination machine.

There are lots of comments online from buyers who say they don’t like switching between serging and coverstitching though.

Adjustable pressure:

adjustable pressure dial on serger

Adjustable pressure lets you change how hard the presser foot is pushing down on your fabric.

You’ll need it to create more pressure to feed thick fabric through the machine, and reduce the pressure for very light fabric.

Most machines have a dial with 3 levels, and a few have 5 levels for more finetuning.

I would avoid ones where it’s just a screw with no markings.

It’s harder to change the pressure accurately without markings. And tricky to get back to normal pressure.

Adjustable stitch length & width:

4 thread overlock stitch on floral georgette

You’ll need to adjust the length and width of your stitches based on how loosely woven a fabric is or how thick/thin it is.

Air threading:

Air threading on the Janome Airthread 2000d. Video credit:

Premium sergers thread the loopers using compressed air.

You just insert your thread inside a hole, push a button or pull a handle, and *tada* it’s threaded! This makes threading the loopers very fast and easy.

A side effect of this is that changing thread colors often (to match your project) won’t be scary anymore. There’s no threading to dread!

Automatic tension:

A few premium sergers can choose tension settings for you automatically.

You select the type of stitch you want, the machine senses the thickness of your fabric, and then it chooses the tension settings for you.

Normally it’s a hassle figuring out the correct tension settings for each fabric. So a machine that can do it for you is a massive time saver.

It’s great for the less patient, and those who have experienced a manual serger before and hate figuring out tension settings.

Differential feed:

serger differential feed dial
The differential feed setting dial. Switch it to ‘2’ to gather the fabric, or ‘0.7’ to stretch the fabric. Photo credit: @GutStoff (Instagram)

Today all modern sergers have a differential feed system.

This will let you stretch out or gather fabric as you’re overlocking.

Why would you want to use differential feed?

Fix puckering seams

If you’re experiencing puckering seams, stretching out the fabric slightly will solve this. It will create a flat, smooth seam.

Fix stretched out seams

If your seam is stretched out, you can very slightly gather the material while serging to create a flat seam.

You might have to do this when sewing stretchy knits.

Create gathers

You can quickly gather fabric if you want to create ruffles or a gathered skirt.

Just turn up the differential feed setting to the max.

It’s so much faster than creating gathers on a sewing machine.

Create “lettuce leaf” edge
Lettuce edge sleeves on a knit dress. Photo credit: Miss Selfridge

The serger can stretch the edge of knit fabrics to create this decorative hem.

How does it work?

Changing the differential feed setting lets you make the front and back feed dogs move at different speeds.

Note: feed dogs are the jagged metal bars under the presser foot.

You can make the back feed dog move faster than the front one to stretch the fabric.

You can make the front feed dog move faster than the back one to gather the fabric.

Or you can keep both feed dogs moving at the same speed for normal serging.

Easy lower looper design

lower looper switch on serger
The switch pulls out the lower looper.

Look for an easy to thread lower looper.

It might be labeled something like “easy” or “F.A.S.T” lower looper threading system.

The lower looper is normally hidden inside the machine, so threading it can be very tricky.

If a serger is designed to let the lower looper come out, you’ll be able to thread it in plain sight.

It makes the threading process much easier.

See the video below; the switch pulls out the lower looper.

‘F.A.S.T’ lower looper system on Brother 4234d. Video credit: Brother EU

Easy rolled hem conversion:

serger rolled hem
A rolled hem on cotton fabric. I’m using a contrasting color.

In the past you had to change the needle plate before you could switch from overlock stitches to rolled hem stitches.

This was pretty frustrating and made the process longer.

Today you don’t have to change the plate.

Look for features like “instant rolled hems” or “easy rolled hems” for sergers that have this (most do).

Easy to thread:

color-coded stitch illustrations on serger
color-coded threading diagrams on serger

Look for color-coded threading guides printed on the machine. These will tell you where to place the threads without you going back to your manual every time.

I also recommend picking a modern serger with an easy to thread lower looper. I would not buy a serger without this.

Free arm:

serger free arm
Free arm on Brother 4234d. Video credit: Brother EU

A free arm is a tube-shaped sewing area. It makes sewing tubes of fabric easier.

You slide your sleeve or trouser hem onto the free arm. This turns the fabric for you as you stitch.

Not all sergers have this.

High presser foot lift:

presser foot lift measured on brother 4234d

The higher the presser foot lift, the more fabric you can fit underneath for stitching.

This is useful when working with thick fabrics.

The highest height I have seen so far is 5 to 6 mm.

Needle threader:

serger needle threader

This will thread the needles for you. No more poking threads through the eye of a needle.

A must-have for those who struggle with their eyesight.

Here’s how it works on the Brother 4234d:

Needle threader in action. Video credit: Brother EU

Retractable cutting knife:

This will let you serge without cutting the fabric.

Most modern sergers have this.

Spreader (or 2 thread converter):

Sergers that can make 2 thread stitches come with a “spreader”. This is also known as a “2 thread converter” (Elna) or “subsidiary looper” (Babylock).

This is a device that sits on your upper looper and lets you make 2 thread stitches.

Some premium models have the spreader built-in.

You won’t have to find your spreader and attach it every time you want a 2 thread stitch. You also won’t risk losing it.

Related posts:

Here’s my roundup of the best overlockers available.

Here’s how overlockers are different to normal sewing machines.

If you’re not sure what stitches an overlocker makes, or when you would actually use certain ones, check out my beginners guide to overlock stitches. There are lots of close-up photos.

I also asked industry experts what makes an overlocker good or bad quality? This is a really eye-opening read. Learn what sacrifices manufacturers make for cheap overlockers.

Now it’s your turn

I’d like to hear from you 🙂

Do you have any questions about what to look for in a serger?

Maybe you don’t understand a confusing serger term?

Or you have extra tips on what serger features to consider?

Let me know by leaving a comment below.


Phone call with a technician at BSK Ltd on 17 Feb. 2020.

Phone calls with salespeople at, Frank Nutt Sewing Machines Ltd, Gur Enterprise (UK) LTD trading as GUR Sewing Machines, and Lords Sew-Knit Centre on 27 Feb. 2020.

Annette. ‘Sergers’. She’s A Sewing Machine Mechanic blog. [online] Available at: [accessed: 29 Feb. 2020]

BP Sewing Machine Youtube video. (2017). ‘How to blow out Brother Serger 1034 D (Pat K)’. [online] Available at: [accessed: 02 March 2020]

Brother EU. Brother overlocker 4234d instructional DVD. [online] Available at: [accessed: 22 March 2020] ‘The AirThread 2000D: Award Winning Machine’. [online] Available at: [accessed: 22 March 2020]

@GutStoff. Instagram. (2018). [online] Accessible at: [accessed: 6 March 2020] ‘Miss Selfridge – Grey Lettuce Edge Mini Dress’. [online] Available at: [accessed: 22 March 2020]

8 thoughts on “How to Choose a Serger or Overlocker: 21 Factors to Consider (+ Checklist)”

    • Hi Chrissy,

      My articles on US sergers have been delayed while I finish up my UK ones. In the meantime, the general points I make in this post still apply in the US.

      Think about what specific features you need, and how often you’ll use your machine. This will help you narrow down certain models.

      For example, do you need a serger with any of these features?
      – 2 thread stitch ability (a lightweight stitch for finishing lightweight fabrics)
      – air threading
      – automatic tension
      – a needle threader
      – a free arm

      These are some of the big differences between sergers.

      If you sew often, I recommend avoiding machines at the lowest price point. The build quality won’t be as good. More info about that here:

      Otherwise, all sergers will create a professional-looking overlock stitch.

      In terms of brands:
      Brother sergers are a good budget option. Their manual threading system is excellent.
      Babylock is a well-respected brand for premium overlockers. Juki has a great air threaded model too.
      And Singer’s reputation for build quality is very poor according to UK serger specialists. So I wouldn’t buy a Singer.

      Sara 🙂

  1. From everything you’ve said, I think I (total beginner to overlocking but sewing on “normal” machines for 60 odd years) need a mid-range overlocker with 2 thread ability and possibly a needle threader. Was looking at the Husqvarna s15 but gone off it now. There’s a Jaguar machine, forgotten model number, that looks better. Any advice would be much appreciated. Budget, could go to £900 but would prefer £400-ish as not sure how much I would end up using it.

    • Hi Jill,

      A good mid-range overlocker with 2 thread stitches and a built-in needle threader is the Brother 4234d. It comes with a blind hem foot and waste bin included. I reviewed it here and gave suggestions for alternatives if it’s unavailable:

      Are you talking about the Jaguar 489? It’s a mid-range machine that can do 2 thread stitches. I think the threading system on that one is pretty good. It’s worth calling a seller to ask if it has a built-in needle threader. I’m looking at product descriptions now and it’s not mentioned on some websites, but from the photos, it looks like it might have it. Ask them if it’s a separate accessory or built-in too.

      The big difference between mid-range (about £400) and premium overlockers (£900) are these 2 features: air threading and automatic tension.

      Air threading is when the machine automatically threads the 2 looper threads for you with the push of a button. It will save you from the frustration of threading these tricky areas. It also stops the looper threads from catching each other and breaking while you’re in the middle of sewing, because each thread is protected in its own tube.

      Automatic tension is when the machine senses the thickness of your fabric, and then chooses the best tension settings for you.

      Neither of these features are essential for most people, but if you want a really easy to operate overlocker, it might be worth it for you.

      I hope this helps. Let me know if you have any follow-up questions.

      Sara 🙂

  2. Hi Chrissy,

    I am looking for a serger that I can sew a tube shape, I want a seam long wise. I am wanting to make neck gaiters and I don’t want a seam that sticks out (if that makes sense) like when you sew anything regularly. I was trying this Singer Overlock (Mod. 14U354) and it looks like the fabric can only be fed through on one side so that would make it so I cannot due a seam down the middle between two ends. Please help, I would so appreciate your expertise. 🙂

    • Hi Erica,

      All sergers can sew a tube, but the seam will stick out. I had a quick look at a store-bought fleece neck gaiter my dad has, and the tube is sewn together with an overlock stitch that sticks out a bit.
      I also had a look at some online photos of other neck gaiters made from thin stretchy fabric. It looks like they’re using a flatlock stitch to create the tube, and a cover stitch to fold and sew the top and bottom edges.

      That probably made no sense lol. Here’s what I mean by ‘flatlock’ and ‘cover’ stitches.

      A flatlock stitch is used to join pieces of fabric together. It creates a strong seam that’s completely flat, so there’s no seam allowance sticking out. You’ll normally see it on activewear. Photo here:

      I’m not aware of any domestic flatlock machines, they’re all big industrial ones.

      Most overlockers advertise being able to do a flatlock stitch, but they mean a faux flatlock. It’s a decorative stitch and doesn’t have the strength of a real flatlock. It looks different too. Here’s a photo of a faux flatlock made using my domestic serger (brother 4234d):

      A cover stitch is used to hem stretch fabrics. On the outside, it looks like 2 rows of “straight” stitching, but on the inside it has “ladders” that allow the stitch to stretch. You’ll nearly always see this on the hems of t-shirts. Photo here:

      You could use this to create a similar effect to a flatlock. So one option is to sew the tube together using a serger, then topstitch the seam down using a cover stitch so that it doesn’t stick out. It’s a bulkier finish, but it looks similar. More info here:

      You can buy domestic cover stitch machines and sergers separately, or 2 in 1 machines that combine them both.

      Ok, that was quite a long answer.

      Quick summary: all overlockers will create a seam that sticks out. They can make faux flatlock stitches that won’t stick out, but it’s not a very strong stitch. Proper flatlock machines are not available for home sewists. The next best option is to buy a 2-in-1 cover stitch and serger machine to create a similar-looking stitch, but it will be bulky.

      I said all this because I’m assuming you want a store-bought finish, but as you can see, it’s a lot of work and machinery.

      If I was making a neck gaiter for personal use, I would just sew it together with a zig zag, mock overlock, or twin needle stitch on my sewing machine.

      I hope this helps,

      Sara 🙂

  3. I went to buy a domestic sewing machine and thy have a sale promo at the moment and together with the sewing machine I bought an overlock Necchi L234A. Never heard of it! But It’s all the same bc Im a beginner and don’t know much about sewing machines either. Can you tell me if it’s a quality server and if I will be able to find parts in case it gets damaged. Or if I should defined change it at the store I bought. Please I hope to hear from you . Thank you

    • Hi Awilda,

      I’ve seen Necchi sewing machines before in Lidl but I haven’t looked into the brand. If it was cheap then it won’t have the same build quality as more expensive machines, but it will still get the job done. Especially if you’re not using it frequently. I would just keep it. Good luck with your new sewing journey! 🙂


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