10x SK5 very sharp and strong blades for olfa knives 18mm - Top quality replacement blades for professionals
Looking for premium replacement blades that won't let you down in the middle of the job? The 10x SK5 Super Sharp and Powerful Blades for OLFA Knives 18mm (SKU: G01853) is the perfect choice for professionals and DIYers. Made from premium SK5 carbon steel, these blades provide exceptional sharpness, durability and long life for everyday demanding tasks. Forget about constantly replacing dull blades and get top performance with every cut.


Why choose SK5 steel blades for your olfa knife?
Safety and efficiency are key when working with olfa knives. Standard blades quickly chip or, worse, break under high pressure, which can lead to unwanted injuries. Our set of 10 replacement snap-off blades, 18 mm wide, are made from high-quality SK5 carbon steel. This steel is recognized in the industry for its exceptional strength, toughness and extremely high resistance to cracking and chipping.
Thanks to advanced steel processing technology, these blades have significantly improved wear resistance. This means they do not melt quickly, allowing you to work continuously and smoothly without constantly changing blades. Since SK-5 carbon steel is prone to reacting with moisture, these blades are additionally protected with a specialized black anti-corrosion coating, which effectively prevents rusting and significantly extends their service life.


Main advantages and benefits of using SK5 blades (SKU: G01853)
By choosing these professional replacement blades, you will experience an immediate difference in quality and speed of work. Here are the key benefits of this premium set:

Exceptional sharpness and durability: High-quality SK5 carbon steel ensures long-lasting and uncompromising sharpness, significantly reducing the effort required when cutting harder and more demanding materials.
Resistance to breaking under pressure: The material is metallurgically designed to withstand higher loads without dangerous chipping or unexpected blade cracking during operation.
Advanced anti-corrosion protection: A special black coating not only gives the blades a modern professional look, but also actively protects them from rust, moisture and external environmental influences.
Fast and safe segment breaking: Precisely positioned and manufactured notches allow for easy, clean and controlled breaking of worn segments, leaving you with a new, perfectly sharp tip immediately.
Universal dimension for wide compatibility: The standard size of 100 x 18 x 0.5 mm fits perfectly with most standard 18 mm olfa knives available on the market.



Product technical specifications
Every detail of these blades is carefully designed with maximum productivity and safety in mind. Below are the detailed technical specifications of the product:

Quantity in package: 10 pieces of premium snap-off blades
Dimensions of each blade: 100 mm (length) x 18 mm (width) x 0.5 mm (thickness)
Material: High quality carbon steel SK5
Surface protection: Black anti-corrosion coating
Blade design: Precise notches for easier, faster and more controlled segment breaking
Product code (SKU): G01853



Versatile use in the workshop, warehouse and household
These extremely strong blades are an indispensable tool for a wide range of craft and home tasks. Thanks to their optimal thickness of 0.5 mm and the exceptional strength of SK5 steel, they are ideal for precise and fast cutting of a wide range of materials, such as:

Thick cardboard, corrugated cardboard and various packaging materials
Wallpaper, foils and self-adhesive tapes
Carpets, textile floor coverings and linoleum
Hard rubber, leather and sealing materials
Plastic cable ties, thinner plastic and cable insulation

By purchasing this practical package, you will always have a superbly sharp blade at hand, regardless of whether you are undertaking home renovations, creative projects, laying flooring or everyday tasks in the warehouse and logistics.


Frequently Asked Questions (FAQ)
1. What makes SK5 steel a better choice than regular steel for olfa blades?
SK5 carbon steel is a high-quality steel with a high carbon content, which gives it exceptional hardness, toughness and wear resistance. SK5 steel blades stay sharp significantly longer than standard blades made from cheaper alloys and are much more resistant to chipping and dangerous breakage under high pressure.
2. How does the black anti-corrosion coating affect the performance and lifespan of the blade?
The black coating acts as an effective protective shield against moisture, hand sweat and other corrosive factors that could otherwise quickly cause carbon steel to rust. In addition to reliable rust protection, this coating also noticeably reduces friction during cutting, allowing for much smoother, cleaner and more precise cuts.
3. Do these blades fit all models of 18mm olfa knives?
Yes, these replacement blades have completely standard industry dimensions (100 x 18 x 0.5 mm). This means they are fully compatible with most standard 18 mm wide olfa knives from various manufacturers on the market, allowing you to easily use them with your existing tool.




Responsible persons:
GEKO - GEKO SPÓŁKA Z OGRANICZNĄ ODPOWIEDZIALNOŚCIA SPÓŁKA KOMANDYTOWA, ul. Spacerowa 3, 97-500 Kietlin, Poland, (+48) 446824004, geko@geko.pl
Distributor for Slovenia: Haloorodje.si, Online Sales, Rok Groznik sp, Podturn 42, 8350 Dolenjske Toplice, info@haloorodje.si, +38669731944, Slovenia
Product origin: China

Instructions for using the product:
• Check if your olfa knife uses 18mm breakable blades.
• Change the blade only when the blade is closed or safely retracted.
• Open the knife mechanism and carefully remove the old blade.
• Insert the new SK5 blade 18 mm into the guide until it clicks into place.
• Before use, check that the blade is stable and does not move sideways.
• Only pull the blade out as far as necessary for cutting.
• After finishing work, fully retract the blade into the handle.
The set contains 10 breakable blades measuring approximately 100 × 18 × 0.5 mm, made of SK5 carbon steel and with an anti-corrosion coating.

Useful tips for work:
• Blades are suitable for most classic 18mm olfa knives, but check compatibility with your model before use.
• They are suitable for various cutting applications, such as cardboard, foil, leather and some plastic materials.
• When the tip becomes blunt, use the next segment or replace the blade.
• For longer blade life, use on a suitable cutting surface and store in a dry place.

Warnings:
• CAUTION – the blades are very sharp.
• Use protective gloves when changing and breaking segments.
• Never cut towards your body or fingers.
• Remove broken segments immediately and safely.
• Do not use a damaged or bent blade.
• Keep blades in their original packaging and out of the reach of children.

Same summary

This set of very sharp and strong 18 mm wide blades is especially suitable for users who frequently cut a variety of materials - from paper to harder plastics or thinner boards. Blades like these work best for home use, small renovation jobs and for versatile use in the workshop or in the field, where fresh sharpness and the ability to quickly change blades are important. Although they provide a good balance between precision and power, they may not be the best choice for the most demanding construction jobs with very thick materials, where an extra long blade is needed. The special feature of this set is the high durability of the blades, which will be a practical choice for anyone looking for efficiency without complicated adjustments.

Recommendation source: Enaa guides and team experiences.

User view

Users of these types of blades most often choose them for everyday contact with materials such as cardboard, wallpaper, thin plastic elements and for quick repairs in the household or garage. The set is especially useful for anyone who often encounters a dull blade when working with olfa knives and is looking for an easy solution for quickly restoring sharpness. The blades are used by many people - from home craftsmen to maintenance workers, craftsmen and even modelers who need a precise and reliable cut.

Users also appreciate the wider range of Geko brand products, which is considered a reliable choice when the balance between quality and affordability is important.

Why buy at Enaa

When buying blades on Enaa, you can choose from a variety of proven products for home or professional use, with key information about dimensions and intended use clearly displayed. On our site, you can quickly compare products to help you decide on the most suitable set for you.

Answers to frequently asked questions

Are these blades suitable for all types of olfa knives with an 18 mm handle?

The blades are a universal size of 18 mm and are in principle compatible with most standard olfa knives that support this width. We recommend that you check the type of cutter and the blade change mechanism before use.

What materials are these blades best suited for?

These blades are best for cutting paper, cardboard, foil, thinner plastics, wallpaper and thin rubber. They are also occasionally suitable for thin boards or softer materials, although for very hard materials we recommend a more robust blade.

How often should the blade be replaced?

The frequency of replacement depends on the frequency and severity of use. If you notice that the blade is no longer cutting smoothly or requires more pressure, it is a good idea to replace it or break the blade for a fresh edge.

Can the blade be easily broken for a new cutting edge?

Yes, the blades are breakable in segments, allowing for quick and easy sharpening without the need for additional tools.

Are these blades safe to use even for less experienced users?

As long as you follow basic safety instructions, the blades are suitable for even the less experienced. However, it is important to use protective gloves when changing the blade and pay attention to correct installation.

Description updated: April 2026