Corby bolt

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Corby boltCorby bolt

The fixing system of the handle with Corby bolts is a very interesting system in the world of knife makers but not only.

It is a threaded pin with two diameters that allows a mechanical fixing of the cheeks which in any case must be glued And subsequently the screw cuts on the pins are eliminated during the processing of the handle and the finished handle appears as if you used simple pins but in reality you made a mechanical tightening not just a planting as in the case of the pin.

Usually the internal diameter is 4 mm in diameter, and the external diameter is 6 mm in diameter, but there are also versions of 8 mm in external diameter although I think they are a bit large but it is a personal taste.

Corby Bolts are a very popular fastening system among knife makers and are used to create knife handles and other similar objects. These threaded pins offer excellent strength and stability to the handle. Their construction with two different diameters, one internal and one external, allows a secure grip and a mechanical fixing of the handle’s cheeks.

Here are some key features of Corby Bolt:

  1. Mechanical fastening: As you mentioned, Corby Bolts offer a mechanical fastening of the handle cheeks. This means that the cheek pads are not simply glued to the handle but are also securely fixed in place via the thread of the pins.
  2. Screw cuts removal: When machining the handle, screw cuts on the outer surface of the Corby Bolts can be eliminated so that the finished handle looks as if traditional pins were used. This gives a cleaner look to the handle.
  3. Customizable sizes: Corby Bolts are available in different sizes, such as 4 mm inner diameter and 6 mm outer diameter, but can also be obtained with different sizes, such as 8 mm outer diameter. The choice of size depends on the personal taste of the knife maker and the specifics of the project.
  4. Robustness: Thanks to their design and thread, Corby Bolts offer an extremely robust and durable fixing. These pins are ideal for knives and other objects that require a solid and durable grip.

Corby Bolts are a popular choice for knife makers and knife makers because they offer an effective method of securely attaching handle cheeks.

Their versatility in size makes them suitable for a variety of custom projects.

Corby bolt

 

 

As you can see the price for each piece is 3-4 euros, much or little is relative but compared to the pins it is a much higher cost.

Personally it is one of the systems that I prefer because it allows you to obtain an excellent level of centering and tightness of the handle that must still be glued but allows you to have a level of tightness of the handle higher than the simple pin.

If you make quality and valuable knives it is definitely not the cost of the corby bolt that affects your creation or even simply if you want to have a fixing system higher than the pin.

If you think about it, Bob Loveless himself had created the Loveless Pins because he wanted a more performing system than the simple pin that does its job but does not also guarantee the tightening of the cheeks of the handle that are entrusted only to the seal of the two-component glue.

Materials used:

Corby bolt

Each material has its own specific characteristics and advantages:

  1. 303 stainless steel: This type of stainless steel is known for its corrosion and rust resistance. It is a popular choice for knife parts that require strength and corrosion resistance. However, it may not be the best choice for handle cheeks if you want a lighter or decorative material.
  2. Aluminum: Aluminum is known to be lightweight and durable. It is often used for knife handles as it offers low weight, which can make the knife more manageable. It is available in different alloys that can vary in strength and hardness.
  3. Brass: Brass is a very popular material for knife handles due to its attractive aesthetics. It has a golden sheen and can be easily processed for decorative purposes. However, it is softer than steel and aluminum, so it may be less suitable for applications that require strength and durability.
  4. Copper: Copper is a material that offers a reddish sheen and can be used for decorative purposes on knife handles. Like brass, it is less durable than steel and aluminum, so it is more suitable for projects where aesthetic appearance takes priority over hardness.

The choice of material will depend on your personal preferences, the specific needs of the project and the desired characteristics for the handle of the knife.

Some knife makers can also combine different materials to achieve a unique and functional aesthetic appearance.

These corby bolts of the following image are custom versions handmade with a lathe by a gentleman who did me the courtesy, I did not have the key cut that I do before assembly but they are on the market and in the sites for makers.

Corby bolt

Mounting the corby bolt on the handle of the knife:

To mount this type of pin you need two drill bits with a diameter of 4.6 and 6.4 mm or a step drill with a diameter of 6/4 mm or a diameter of 8/4 mmCorby bolt coltellimania.com

 

Corby boltThere are also other possibilities to make the two punctures but the important thing is to leave material for the support and pull of the pin and have a depth that allows you to avoid once the key cut is removed from not having to remove too much material because the risk is to see the thread and consequently you have to start over.

Below you will find a section where you see the schematized assembly of the corby bolt, the maximum length is 24 mm and not 29 mm but nothing changes it is just a version that I had done.

Corby Bolt

 

 

 

 

 

 

It is important to carefully consider the assembly procedure to ensure that the fastening is robust and that the aesthetic appearance is as desired.

Below is a schematic overview of the Corby Bolt assembly process:

  1. Handle preparation: Make sure the handle of the knife is properly prepared, with the cheeks and holes ready for mounting the Corby Bolts.
  2. Tool choice: As you mentioned, you can use drill bits with a diameter of 4.6 mm and 6.4 mm or a step bit with a diameter of 6/4 mm or 8/4 mm. The choice of tools will depend on the size of the Corby Bolts and the size of the holes required.
  3. Hole Hole: Be careful to position the holes precisely so that the Corby Bolts align perfectly. Make sure the holes are deep enough to fully accommodate Corby Bolts and leave enough room for pins to rest and pull.
  4. Mounting Corby Bolts: Insert Corby Bolts through the holes, making sure they are aligned correctly. You can apply an adhesive to ensure a better fit between the Corby Bolts and the handle.
  5. Corby Bolt tightening: Use a torque wrench or Allen key to tighten Corby Bolts firmly. Be sure not to apply too much pressure, as this may damage the material or the thread of the pins.
  6. Cutting pins: Once tightened, you can cut off the excess pins so that the handle looks clean and even. Be sure to cut evenly on both sides.
  7. Sanding and finishing: After cutting the pins, do sanding and finishing the handle to achieve the desired shape and a smooth surface.
  8. Possible polishing: If necessary, you can further polish the handle to achieve a shiny or matte finish, depending on your preference.
  9. Check and Fix: Check the handle of the knife carefully to make sure the Corby Bolts are securely secured and the handle is well finished.

By carefully following these steps, you should be able to successfully mount Corby Bolts on the handle of the knife, achieving an aesthetically pleasing and functionally solid result.

Always remember to work carefully and precisely to get the best results.

Corby bolt

Corby bolt

Conclusions:

Corby Bolts represent an innovative and reliable fastening system in the world of knife makers and in the creation of handles for knives and other similar objects.

The main features that make them attractive include the mechanical fastening of the cheeks, the ability to eliminate screw cuts for a cleaner appearance, and the availability in different sizes to suit personal preferences and design requirements.

Their robustness makes them an excellent choice to ensure a solid and long-lasting grip.

Overall, Corby Bolts are an option to consider for anyone who wants to make high-quality, durable knife handles.

Personally the corby bolt I find a very interesting fixing system of the handles that allows you to tighten the handle even more objectively than the pin and leaves an aesthetic finish of the handle as if it is a simple pin.

An added value that you can give to your creations.

Clearly it has a higher cost than a pin and requires a few more steps during processing but certainly allows a more efficient fixing of the handle cheeks.

I do not recommend using it without also using two-component glue for fixing the handle.

Are You Experience?

Andrea


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Andrea F

Maker and Enthusiast of Knifemaking. Other: Engineer / Professional Blogger / Bass Player / Instructor of Boxing / Muay Thai / Brazilian Jiu Jitsu / Grappling / CSW / MMA / Self Defence / FMA / Dirty Boxing / Silat / Jeet Kune Do & Kali / Fencing Knife / Stick Fighting / Weapons / Firearms. Street Fight Mentality & Fight Sport! State Of Love And Trust!

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