What Size Lag Bolts For Tv Mount Are Necessary

January 25, 2023 6 min read

what size lag bolts for tv mount

Lag bolts are the better version of screw bolts with more grip and convenience. Once you determinewhat size lag bolt for  TV mount needed, the whole process gets easier from there. 

There are several lag bolt sizes available in the market. But you won't need to know about them all. In most cases, M4, M6. And M8 is the standard choice. But sometimes, you might need to know about M10 or M12. 

Here, we will try to introduce the process of determining the size of the lag bolt that you will need. And then we will describe how to use them to mount the tv on the wall safely.

What Is Lag Bolt

what is a lag bolt

Even though bolts have been in existence since the 1400s, lag bolts are new in the market. This was designed to hold onto heavy weighted projects. 

When it came to the market, it was used on barrels, also known as lags. When the barrels were made and shipped to long distanced places, lag bolts were the best bolts to secure them.

They are not much different than the regular bolts, but still they are not the same. In lag bolts, the ends are tapering. And it doesn’t need a nut to secure. 

It works like a screw. The thread of lag bolts are designed to work on their own. These bolts are used in places where they  stay exposed. Thus the bolts are given metal protection to preserve the antic look and serve the purpose.

What Size Lag Bolt Is Necessary For TV Mounting

lag bolts for tv mount

When we try to define the size of the lag bolt for TV mounting, it mostly depends on the size and the brand of the TV. They tell you what size you need.

In most cases you will find the TV company is collaborating with VESA (Video Electronic Standard Association). They have some standard measurements that fit for mounting TV on the wall. There are square shaped holes in the back. By measuring the distance between the holes, you will get the feasible lag bolts for your TV mount. 

Here are some most commonly used lagbolts sizes for hanging Tv mount.


It is the smallest size of the lag bolt. If the TV company has recommended VESA 75, then you need to choose M4. It is 75 mm × 75 mm. In inches, it's approximately 3" × 3". 

Also with VESA 100, the measurement is 100 mm × 100 mm, which is 4" × 4" (approx) and with VESA 100 / 200, the measurement is 100 mm × 200 mm, which is 4" × 8". 

M4 is the smallest possible lag bolt for TV mounting. They are capable of holding on the pressure. Using a large bolt means you will be using an unfit lag bolt and that can cause friction. Sometimes it can even be loose and that will ultimately cause damage to the fitting.

If your TV is small in size and doesn’t have VESA, then M4 lag bolt is recommended. 


For VESA 100 / 200, you can also use  M6, but it shouldn’t be the first choice if you have M4. The best fit of M6 is VESA 200. It is measured as 200 mm × 200 mm, (8" × 8" approx). 

M6 is the lag bolt of medium size. It is specially used for TV more than 41". M6 is also termed as a standard sized for TV mounting if you are not sure whether you should select the large one or the small one.


It is not the largest size of lag bolt, but compared to M4 and M6 it is larger. For VESA 400, it measures 400 mm × 400 mm, (16" × 16" approx.), M8 is recommended. 

M8 is for large Tvs. Especially the room theaters.

In the market, you will find larger sizes like M10 and M12. These are not generally used for TVs. But special cases exist. All the TVs nowadays come with mounting manuals. There, you can also determine which one to use or if you do need larger lag bolts. 

How To Use Lag Bolts In Wall Tv Mounting

what size lag bolts for tv wall mount

If you haven’t used lag bolts for TV mounting before, then find the whole step by step process below. They are described in general terms so that you can understand what you need.

Step 1: Check Out The Tools Of The Tool Box

For mounting TV, you will find several kit boxes or tool boxes with the mounting bracket. Check what the screws and bolts are. You will need a drill machine to work with which often doesn’t come with the tool box. Also try to get hold on the drilling pins of the drill machine in different sizes.

Step 2: Look For The Stud Wall And Mark The Drilling Places

In the tool box, you will find the stud finder. Use it to determine where you have the stud. Once that is done, determine where you want the TV to be mounted. 

Then hold the mount onto the wall and mark with the pencil where you want the drilling. That way, ensure that you don't make any mistakes. At first, start with 4 holes, then if you need more you can put them.

Related Stud: How to mount a tv on the wall without studs

Step 3: Choose The Bolt And Drilling

Using the VESA code, try to determine what type of bolt you will require. Depending on the size of the lag bolt, choose the drill pin. Try not to use a larger drill than the lag bolt. Otherwise it will lose its grip.

Step 4: Putting The Lag Bolts

For this, you might need help from a second person. Ask them to hold the mount against the wall and you put the lag bolt in the drilled holes. As the head of the lag bolts are hex headed, you can't use a regular screwdriver. Rather use a ratchet or a nut driver. Make sure they are well fitted so that you can tighten the lag bolt properly to get the best grip.

Step 5: Put More Lag Bolts If Necessary 

Once you have set the mount bracket, try to determine if you need more bolts. In case of large TVs, even if you have used large lag bolts, try to use at least six bolts. This is for safety purposes. In general, mounts do come with access so that you can use multiple lag bolts. 

Frequently Asked Questions 

Are TV mounting bolts universal?

Sizes of the TV mounting screws are a very important part of ensuring safety. Thus, it was supposed to have a universal size of screw. But unfortunately only the one with VESA has universal measurements. 

How do I know if my TV mount is strong enough?

Generally in Television, size and weight are inseparable. The bigger the television, the heavier it is. Mounts will have a greatest weight rating, as well as a scope of VESA principles that are viable. However, as long as your screen falls inside the standard rules, the mount ought to effectively hold the heaviness of your television.

What weight is too heavy to mount a TV?

A guideline is as much as 80 pounds of weight is upheld by a solitary stud. Contingent upon the wall type, you could track down just a solitary stud. In cases like these, it is ideal to utilize a drywall holder that can uphold as much as eighty pounds of weight. Getting the right equipment is significant for setting up the television securely.

Final Words

When it comes to hanging TV on the wall, the first thing to do is, ensuring security. That is why sizes of lag bolts for TV mounting matters. Once you knowwhat size lag bolts for TV mount are necessary, you can arrange the tools you need to work with. 

It is not true that the large lag bolts are always the best choice. First of all, the large lag bolts can cause unnecessary friction into the mount bracket. And secondly, they create unwanted big holes in the wall. So work with the right size to get the best out of the situation. 


  1. https://rtbolts.myshopify.com/products/m8-complete-tv-wall-mount-bracket-bolts-lag-screws-stainless-vesa-400?variant=1023652941 

  2. https://eagletvmounting.com/what-size-lag-bolts-for-tv-mount/ 

  3. https://www.oldwestiron.com/blogs/news/tool-talk-everything-you-need-to-know-about-lag-bolts

  4. https://eagletvmounting.com/what-size-lag-bolts-for-tv-mount/#:~:text=So%2C%20the%20most%20common%20screw,depending%20on%20exceptions%20as%20well.

  5. https://youtu.be/vnJJvP2zgD0