Hapstone RS Sharpening System: Is it the KME Killer?

Hapstone RS Modular Sharpening System

The Hapstone RS is an exceptional knife sharpening system created by the Ukrainian team of Hapstone. With a focus on efficiency and ease of use, this system is perfect for maintaining sharpness in your kitchen knives, tools in your repair shop, or blades used in your hobbies. After investing five years in its development, the Hapstone RS has emerged as one of the finest knife sharpeners on the market, thanks to its unique design and outstanding performance.

The Key Features of the Hapstone RS Modular Sharpening System

The Hapstone RS Modular Sharpening System stands out from the competition due to its impressive features. Let's take a closer look at what makes this system exceptional:

1. Efficient and easy-to-use knife sharpening system

Designed to keep your kitchen knives, repair shop tools, and hobby blades sharp, the Hapstone RS is engineered for efficiency and ease of use. Its user-friendly design ensures that even beginners can achieve professional-level results with minimal effort.

2. Unique design and exceptional performance

The Hapstone RS is the result of meticulous design and engineering, culminating in a sharpening system that delivers exceptional performance. Its innovative features set it apart from conventional sharpeners, making it a preferred choice for knife enthusiasts and professionals alike.

3. Versatile system accommodating a wide range of knife sizes and thicknesses

Whether you have small paring knives or large chef knives, the Hapstone RS can handle them all. Designed to sharpen all types of knives, it accommodates knife lengths ranging from 40mm to 230mm. Furthermore, it can handle knife thicknesses up to 6mm, ensuring that you can sharpen a diverse collection of blades with ease.

4. Secure and consistent sharpening with innovative knife-holding design

One of the standout features of the Hapstone RS is its secure knife-holding design, which ensures consistent sharpening results. The system firmly holds the knife in place, eliminating any wobbling or instability during the sharpening process. This innovative design provides you with the confidence to sharpen your knives accurately and efficiently.

5. Magnetic 360° quick release ball pivot for total sharpening freedom

The Hapstone RS takes convenience to the next level with its magnetic 360° quick release ball pivot. This feature allows you to rotate the knife freely while maintaining a secure grip, granting you the flexibility to sharpen different parts of the blade without having to reposition the knife constantly. Say goodbye to awkward angles and hello to total sharpening freedom!

6. Durable and long-lasting materials ensuring performance and stability

The durability of the Hapstone RS is unparalleled. Constructed with high-quality materials, this sharpening system is built to withstand rigorous use. Its sturdy construction ensures stability during sharpening, providing a solid platform for achieving consistent and precise results every time.

7. Stone usage: 6" x 1" (150 x 25 mm) and 4" x 1" (10 x 25 mm)

The Hapstone RS is compatible with sharpening stones of different sizes. It accommodates 6" x 1" (150 x 25 mm) stones, ideal for general sharpening and shaping, as well as 4" x 1" (10 x 25 mm) stones, perfect for fine-tuning and polishing. This flexibility allows you to tailor your sharpening process according to your specific needs and preferences.

The 4" x 1" (10 x 25 mm) stones are a standard size for the MKE sharpener.

8. Maximum number of clamps on the bar: 4

The Hapstone RS features a bar that can hold up to four clamps simultaneously. This feature is particularly useful if you want to sharpen multiple knives or need to switch between different grits of sharpening stones quickly. With the ability to accommodate multiple clamps, the Hapstone RS streamlines the sharpening process, saving you time and effort.

It also aids in maintaining blade stability, especially on flexible or hard to clamp knives.

9. Weight: 88.18 oz (2.5 kg)

Despite its robust construction, the Hapstone RS remains relatively lightweight at 88.18 oz (2.5 kg). This makes it easy to transport or store when not in use, ensuring that you can take your sharpening system with you wherever you go.

10. System sizes: 11"х5.5"х7.4" (280х143х188mm)

The Hapstone RS boasts a compact size, measuring 11"х5.5"х7.4" (280х143х188mm). Its compact footprint ensures that it won't take up excessive space on your countertop or workbench, making it suitable for any kitchen or workshop setup.

11. Minimum blade length: 1.6" (40 mm)

Whether you're dealing with a small pocket knife or a large chef's knife, the Hapstone RS can accommodate various blade lengths. Its minimum blade length requirement of 1.6" (40 mm) ensures that even the tiniest knives can be sharpened effectively.

12. Maximum blade length: 9.1" (230 mm)

For those who work with longer blades, the Hapstone RS has you covered. With a maximum blade length allowance of 9.1" (230 mm), you can confidently sharpen your longer knives without worrying about any restrictions.

13. Maximum blade thickness: 0.3" (6 mm)

The Hapstone RS can handle knives with varying thicknesses. With a maximum blade thickness capacity of 0.3" (6 mm), it accommodates even the thickest of blades, ensuring that your sharpening needs are met across a wide range of knife types.

14. Minimum sharpening angle: 12°

If you prefer a shallower edge angle for precise cuts, the Hapstone RS allows for a minimum sharpening angle of 12°. This level of customization enables you to sharpen your knives to your desired specifications, achieving optimal performance for your specific cutting tasks.

15. Maximum sharpening angle: 30°

For knives that require a steeper edge angle for enhanced durability, the Hapstone RS provides a maximum sharpening angle of 30°. This broader range of angles caters to different types of knives, ensuring that you can sharpen each blade to its optimum performance level.

How to Set Up and Use the Hapstone RS Modular Sharpening System

Now that we've explored the key features of the Hapstone RS, let's delve into how to set up and use this exceptional sharpening system effectively. By following these steps, you'll be on your way to achieving razor-sharp edges with ease:

1. Unboxing and assembly

When you first receive your Hapstone RS, it's important to carefully unbox and inspect all the components. Ensure that everything is included and in good condition. The system is designed for easy assembly, so you'll be up and running in no time. Follow the provided instructions to put the system together securely.

2. Adjusting the sharpening angle

The Hapstone RS allows you to adjust the sharpening angle to suit your preferences and the specific knife you're working with. Begin by loosening the angle adjustment knob, which is conveniently located on the back of the system. Once loosened, select the desired angle using the angle cube, and then tighten the knob to secure the angle in place. you can use the inbuilt fine tuning screw to dial the angle to the exact angle you desire.

3. Selecting and attaching sharpening stones

Choosing the right sharpening stones is crucial for achieving the desired results. Consider the initial condition of your blade and determine whether a coarse, medium, or fine grit stone is appropriate. The Hapstone RS supports stone sizes of 6" x 1" (150 x 25 mm) and 4" x 1" (10 x 25 mm), so select stones within these dimensions.

Attach the selected sharpening stone to the stone holder by tightening the screws firmly but not excessively. It's important to ensure that the stone is securely fastened to prevent any movement during sharpening.

The 6" x 1" (150 x 25 mm) stones are preferred as the lock into the system with the dovetail ends.

4. Using the sharpening system step-by-step

Now that your Hapstone RS is set up and ready to go, let's explore the step-by-step process for using the system effectively:

Preparing the knife

  1. Ensure the knife is clean and free of any debris or oils.
  2. Secure the knife in the system's knife holder, ensuring it is stable and properly positioned for sharpening.

Establishing the bevel

  1. Begin with the coarsest grit stone suitable for your knife's condition.
  2. Apply a few drops of water or honing oil to the surface of the stone to facilitate the sharpening process.
  3. Holding the knife at the desired angle, gently glide the blade across the stone, moving from the base to the tip in a smooth, controlled motion.
  4. Maintain a consistent pressure and speed throughout the sharpening process, ensuring even contact between the blade and the stone.
  5. Repeat this process on both sides of the blade, gradually working your way from the heel to the tip.

Refining the edge

  1. Once you've established the bevel with the coarse grit stone, progress to a finer grit stone for refining the edge.
  2. Follow the same technique as before, maintaining the desired sharpening angle and using gentle, controlled strokes to sharpen both sides of the blade.
  3. Repeat this step with progressively finer grit stones until you've achieved the desired level of sharpness and edge refinement.
  4. Recheck your angle during the process as the metal removal may slightly change the working angle.

Polishing and stropping

  1. For an extra polished finish, you can use a leather strop or honing compound to further refine the edge and remove any remaining burrs.
  2. Apply a small amount of honing compound to the leather strop.
  3. Holding the knife at the desired angle, gently glide the blade across the strop, alternating sides, and maintaining consistent pressure.
  4. Repeat this process several times until you've achieved the desired level of sharpness and smoothness.

With the Hapstone RS, you have the freedom to experiment and find the sharpening technique that works best for you. Remember to maintain a consistent sharpening angle, apply even pressure, and take your time to ensure excellent results.

Tips and Techniques for Achieving Excellent Results

While the Hapstone RS Modular Sharpening System is designed to be user-friendly and efficient, incorporating some tips and techniques can help you elevate your sharpening game and achieve even better results. Here are some key tips to keep in mind:

1. Understanding different types of sharpening stones

Sharpening stones come in various materials and grit levels, each serving a specific purpose. It's important to familiarize yourself with the different types of stones available and their recommended uses. Some common types of sharpening stones include:

  • Oil stones: Made from natural or synthetic materials and require the use of honing oil to facilitate the sharpening process.
  • Water stones: Soak in water before use and provide excellent sharpening performance. They are often preferred for their fast cutting action.
  • Diamond stones: Embedded with industrial-grade diamonds, these stones are incredibly durable and offer exceptional sharpening speed.

By understanding the characteristics and benefits of each type of sharpening stone, you can select the most suitable one for your specific needs and achieve optimal sharpening results.

2. Choosing the right sharpening angle

The sharpening angle plays a crucial role in determining the cutting performance and durability of your knife's edge. Different types of knives and cutting tasks require specific angles. Here are some general guidelines to consider:

  • Lower angles (12°-18°): Ideal for tasks that require precision and clean cuts, such as filleting fish or slicing delicate ingredients.
  • Medium angles (20°-25°): Suitable for most everyday kitchen tasks, offering a good balance between sharpness and durability.
  • Higher angles (26°-30°): Recommended for heavy-duty tasks and knives that require extra strength and durability, such as cleavers or hunting knives.

It's important to note that these angles can vary based on personal preference and the intended use of the knife. Experimentation is key to finding the sharpening angle that suits you best.

3. Maintaining consistency in sharpening

Consistency is key when sharpening your knives. By maintaining a consistent sharpening angle, pressure, and stroke length, you can ensure that each side of the blade receives equal attention and achieves a uniform edge. This consistency also helps in developing muscle memory, allowing you to replicate the sharpening technique accurately each time.

4. Proper knife handling and pressure

When using the Hapstone RS or any sharpening system, it's crucial to handle the knife with care and maintain a firm grip. Proper knife handling minimizes the risk of accidents and ensures a steady and controlled sharpening process.

Additionally, applying the right amount of pressure during sharpening is essential. Too much pressure can cause excessive material removal, leading to an uneven edge or unnecessary blade wear. Conversely, too little pressure may result in an ineffective sharpening process. Find a balance that allows you to maintain control and achieve the desired results.

5. Using honing compounds and strops for finishing touches

To achieve an extra level of sharpness and polish, consider incorporating honing compounds and leather strops into your sharpening routine. Honing compounds are abrasive substances applied to a strop, and they help remove micro burrs and refine the edge, resulting in a razor-sharp finish.

Apply a small amount of honing compound to the leather strop, and with gentle strokes, run the knife along the strop's surface, alternating sides. This final step helps refine the edge and ensures a clean, polished finish.

Remember, honing compounds and strops are optional additions to your sharpening process. Experiment with different compounds and techniques to find the combination that delivers the desired level of sharpness for your knives.

By incorporating these tips and techniques into your sharpening routine, you can maximize the performance of the Hapstone RS and achieve exceptional results with every sharpening session.

Comparing the Hapstone RS Modular Sharpening System with Other Options

Hapstone RS KME and Worksharp Precison comparison

With numerous knife sharpening options available on the market, it's important to understand how the Hapstone RS Modular Sharpening System compares to other alternatives. Let's explore some common options and highlight the advantages that the Hapstone RS offers:

1. Traditional sharpening methods

Traditional sharpening methods, such as using a sharpening stone by hand, have been employed for centuries. While these methods can yield satisfactory results with practice, they often require more time and effort to achieve consistent sharpening angles. The Hapstone RS, on the other hand, provides a secure platform and adjustable sharpening angles, ensuring more precise and efficient sharpening with less room for error.

2. Benchtop sharpening systems

Benchtop sharpening systems are designed to provide stability and consistency during sharpening. However, many of these systems have limited adjustability and can be bulky, occupying valuable countertop or workspace. The Hapstone RS offers a modular and compact design that doesn't compromise on stability. Its versatility and adjustable sharpening angles make it a more flexible and convenient option.


3. Electric sharpeners

Electric sharpeners are known for their convenience and speed. However, they can be limited in terms of adjustability and the quality of the sharpening results. The Hapstone RS provides a more precise and controlled sharpening process, allowing for greater customization and achieving superior sharpness and edge refinement.

When comparing the Hapstone RS Modular Sharpening System with other options, its exceptional performance, adjustable sharpening angles, versatility, and compact design make it a standout choice for those seeking professional-level sharpening results.


1. Is the Hapstone RS Modular Sharpening System suitable for beginners?

Absolutely! The Hapstone RS is designed to be user-friendly, making it a great option for beginners. Its modular design and adjustable sharpening angles allow for easy customization and precise sharpening, even for those new to the sharpening process.

2. Can the Hapstone RS sharpen different types of knives?

Yes, the Hapstone RS is designed to sharpen all types of knives, from kitchen knives to pocket knives and even chisels. Its versatility and adjustable sharpening angles ensure that you can achieve optimal results regardless of the knife type.

3. Does the Hapstone RS come with sharpening stones?

The Hapstone RS does not come with sharpening stones included. However, it is compatible with various sharpening stones that you can purchase separately. The system supports stone sizes of 6" x 1" (150 x 25 mm) and 4" x 1" (10 x 25 mm).

4. How long does it take to set up the Hapstone RS?

Setting up the Hapstone RS is relatively quick and straightforward. With the provided instructions, you can assemble the system in a matter of minutes and be ready to start sharpening your knives.

5. Can I achieve a razor-sharp edge with the Hapstone RS?

Yes, the Hapstone RS is capable of delivering razor-sharp edges. By following the proper sharpening techniques and using the appropriate sharpening stones, you can achieve exceptional sharpness and edge refinement with this system.


The Hapstone RS Modular Sharpening System is a remarkable tool that brings professional-level sharpening capabilities to the comfort of your own home or workshop. Its unique design, outstanding performance, and user-friendly features make it a top choice for both novice sharpeners and seasoned professionals. With its exceptional adjustability, secure knife-holding design, and compatibility with a wide range of knife sizes and sharpening stones, the Hapstone RS sets a new standard for precision and efficiency in knife sharpening.

Investing in the Hapstone RS means investing in the longevity and performance of your knives. By maintaining optimal sharpness, you can enjoy effortless cutting, precision, and control in your culinary adventures, repair projects, or hobbies. Experience the difference for yourself and unleash the true potential of your blades with the Hapstone RS Modular Sharpening System.

The Hapstone RS sharpening system outshines the competition, surpassing not only the Worksharp Precision and the KME sharpening system in quality, precision, and stone options but also offering a superior double clamp option.

While both the Worksharp Precision and the KME sharpening system feature single clamp designs, the Hapstone RS takes it a step further with its double clamp configuration. This innovative feature provides enhanced stability and balance during the sharpening process, ensuring consistent and precise results.

The double clamp option of the Hapstone RS offers the ability to securely hold the blade from both sides, minimizing any potential movement or wobble. This translates into improved control and accuracy, allowing you to achieve razor-sharp edges with unmatched confidence and ease.

By investing in the Hapstone RS and its double clamp system, you gain an advantage over the limitations of the single clamp designs offered by its competitors. Experience the pinnacle of sharpening perfection and elevate your sharpening game to new heights.

Choose the Hapstone RS sharpening system with its superior double clamp option and enjoy the ultimate sharpening experience that sets the standard for quality, precision, and versatility.