How to cut an M4 through screw during door handle installation?

Learn how to correctly shorten an M4 through screw

Installing a door handle may seem simple, but it can also hold a few surprises. For example, what should you do if the M4 through screw that holds the handle is too long and protrudes from the other side? How can you cut it without damaging the door? This is the subject of this article, where we show you a simple and effective method for shortening an M4 through screw. You will see that it is easier than you think!

What is an M4 screw and what is it used for?

If you are a passionate DIY enthusiast or a professional installer, you have surely already heard of M4 screws. But do you really know what they are and what they are used for?

An M4 screw is a specific type of screw that meets sizing standards defined by the international standard ISO 68-1. The "M" in M4 refers to the metric standard, meaning it follows international standards for thread dimensions and shape; whilst the number "4" indicates the nominal diameter of the screw in millimetres. Metric screws are commonly used in industrial applications, but also in DIY and joinery.

An M4 screw is used to fix parts together, particularly metal or plastic parts. In the case of a door handle, the M4 screw would be used to fix the handle to the mount, whether it is a wooden, metal or other material door. This particular screw is often chosen for its moderate size, suitable for the fixing requirements of door handles.

M4 screws can be manufactured from different materials, such as steel, stainless steel, brass, etc., depending on the specific needs of the application and aesthetic preferences. Cutting or shortening an M4 screw may be necessary when its standard length is not suitable for the thickness of the material to be fixed.

What tools and materials are needed to cut an M4 through screw?

You have purchased a new door handle, but when it comes to installation, you realise that the M4 through screw is too long. To shorten it, you will need the following items:

• A hacksaw or wire cutters: the hacksaw allows for a precise cut, but if it is not available, pliers can be an effective alternative, although potentially less precise.
• A vice: this is a device that allows you to hold the screw in place whilst you saw it. It prevents the screw from moving or slipping and ensures a straight and clean cut. However, in some cases, a pair of pliers can also do the job, although the vice provides superior stability.
• A file: this is a tool that allows you to smooth the edges of the screw after cutting. It prevents the screw from being too sharp or chipped and makes it easier to screw onto the door handle.
• A tape measure or ruler: this is a measuring instrument that allows you to determine the length you need for your screw. It prevents you from cutting too much or too little material.
• A marker or pencil: this is an accessory that allows you to mark the cutting point on the screw. It ensures optimal precision when sawing.

How to cut the M4 through screw without damaging the thread?

Once you have gathered all the necessary tools and materials, you can proceed with cutting the screw. Here are the steps to follow:

• Measure the length you need for your screw. To do this, place the door handle on the hole provided for this purpose and insert the screw into the hole. Mark the point where the screw protrudes from the other side of the door with the marker or pencil.
• Remove the handle and screw from the door. Place the screw in the vice ensuring that the cutting mark is visible and accessible. Tighten the vice to hold the screw firmly.
• Take the hacksaw and begin to saw the screw following the cutting mark. Make regular and firm movements, without forcing or hesitating. Ensure that the blade is perpendicular to the screw to obtain a straight cut.
• Once you have cut the screw, remove it from the vice. Take the file and pass it over the edges of the screw to soften and even them out. Be careful not to file the thread, which must remain intact in order to screw correctly.

If you would like to simplify cutting your screw, we invite you to watch this video that we have made especially for you.

What are the tips for checking that the screw is the correct length and for fixing it correctly to the door handle?

You have successfully cut your screw, but how do you know if it is the correct length and how do you fix it to your door handle?

To check that your screw is the correct length, place it back in the handle hole and make it emerge on the other side of the door. The head of the screw should be flush with the hole, without protruding or going in too deep.

To fix your screw to your handle, use a screwdriver suitable for the type of head on your screw (flat, cross, star, etc.). Screw gently but firmly, without forcing or unscrewing. The handle must be securely fixed, without play or movement. If your handle has two holes, repeat the operation with a second screw identical to the one you have just cut. Ensure that both screws are aligned and symmetrical.

And there you have it, you have successfully cut a screw to the correct length for your door handle! You can now enjoy your new handle, which will make opening and closing your door easier.