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Upper knife for your Serger LMB 237

Blades for Overlockers Upper knife LMB 237

Make sure you always have extra lock blades at home.

Order here the serger knife LMB 237

How to find the right knife for your lock machine.
Print the overlock knives template.
Find the lock knife on this PDF that most likes to your knife, and place your knife on the picture to compare. It has to match really well otherwise it doesn't fit.
Below the example is the order number, put this order number at the top in the search bar and click on ‘search’, now you can see the price and you can easely order the knife.
Real-size PDF of all knife sets
Real-size PDF of all lower knifes
Real-size PDF of all upper knifes

Please note that ordering can only be done online,
Unfortunately, it may be that some of the blades on the list are no longer available.
In this case, you cannot find them on our site, and they also cannot be ordered.

Here you can see a video how easy it is to replace the blades on yourself

Help my Lock machine doesn’t cut the fabric properly anymore:

If the fabric is not properly cut by the lock machine,
or the machine pulls the fabric into the machine,
then the knives are probably bone or damaged.
After using often the serger machine, the knives become blunt.
Especially when you use thick and special fabrics.
Often it happens when you accidentally sew on a pin,
even then the machine will no longer cut properly.

Each serger has an upper and lower knife.
Regularly check that the blades are sharp by passing your nail along the knife.
You will feel an unevenness immediately.
To have perfect sewing results, replace regularly new blades in your lock machine.
When changing the blades, make sure that the bottom knife stays just below the needle plate.
The upper blade should fall over the lower blade at the deepest point.

Can I change the knives by myself?

You can easily fix the new lock knives in your machine.
The video below shows you how this works.
Make sure that the lower blade is just slightly below the stitch plate,
and that the upper Blade, falls over the lower blade at the deepest position.

Here you can see a film how you can easily replace the locker blades yourself

Matri Sewing Machines

Are you looking for a sewing machine that delivers on its promises? With Matri, you can order with complete confidence. Thousands of customers have already found the perfect sewing machine through our online store – quickly delivered, fairly priced, and backed by genuine service.

Why choose Matri?

  • Reliable quality – Our sewing machines are thoroughly tested and selected for durability, ease of use, and precision.

  • Fast delivery from our own stock – Order today, and in many cases, have it at home tomorrow.

  • Personal advice – Not sure what to choose? Our customer service is happy to offer honest and expert advice, even after your purchase.

  • Fair pricing – No hidden surprises. Just clear prices and often great deals.

Experience since 1929

For over 90 years, Matri has been a trusted name for sewing machines, overlock machines, embroidery machines, and all related accessories. With nearly a century of craftsmanship and practical experience, we know exactly what matters to our customers: user-friendly machines, reliable quality, and excellent service. Whether you’re just starting to sew or looking for an advanced machine for professional use, Matri offers a carefully curated selection, backed by expert advice and fast delivery through our webshop.

Worry-free online shopping

Whether you’re a beginner or have been creating for years, at Matri you’ll find exactly what you need. Order safely, quickly, and with the peace of mind that you’re choosing an online store that truly cares about its customers.

Matri.eu – quality and service for all your sewing, overlock, and embroidery machines, all online.

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Delivery Information

Delivery and ShippingDelivery and Shipping

Free shipping for all orders over € 50,-

Orders under € 50,- costs € 4.95 (Within the EU)

All new Machines and Dress-forms are sent FREE with track-trace code
We ship parts and accessories as standard shipping. This delivery takes longer, see the table below.
(Unless it is specifically stated with a product that it will be shipped later)

  • If your order has been shipped with Track Trace, please check the status of the shipment every day.
  • When ordering, make sure that you fill in everything correctly, address changes are no longer possible after completing the order.

Average delivery time after items leave our warehouse are as follows :

  With track trace code Standard Shipping
The Netherlands 1 to 2 working days 3 to 5 working days
Belgium 1 to 2 working days 3 to 6 working days
France 3 to 5 working days 6 to 12 working days
Germany 1 to 3 working days 3 to 6 working days
United Kingdom 3 to 5 working days 6 to 12 working days
Spain 3 to 5 working days 6 to 12 working days
Italie 3 to 5 working days 6 to 12 working days
Other EU 5 to 7 working days 6 to 15 working days
Outside Europe 15 to 17 working days 15 to 30 working days

Shipping costs outside the EU is € 15,- and outside Europe is € 30,-