Questions asking for information about a known LEGO element/brick. Use the [Identification] tag for questions about unknown pieces or sets.

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20
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5answers
3k views

What is the largest single LEGO piece?

What is the largest single LEGO piece ever produced? This does not include LEGO affiliates like Duplo. Clarifications It must be a purchasable block. By largest, I mean largest by Volume/Weight of ...
20
votes
3answers
2k views

What is inside the “weight element” brick?

I own a few bricks that contain a weight inside of them. 52g according to Lego. What exactly is inside of these bricks that makes them heavy?
18
votes
7answers
2k views

Why did Technic bricks have holes in the studs?

Lego Technic (/ Expert Builder) bricks have always had a very different design than the normal Lego brick, with peg holes lining the sides serving fairly obvious purposes, but they also have had (as ...
18
votes
1answer
801 views

Why aren't LEGO bricks cubic?

The height of the 1x1x1 LEGO brick is 6/5 times its width. Is there any particular reason for these proportions? And especially why not making a cubic brick (it would have made SNOT building easier)? ...
17
votes
5answers
2k views

What is the smallest LEGO component?

When I purchase bulk LEGO bricks, one of the first things I do is to tip the whole lot into a mesh bag and give them a good soak in the bath (of course, I remove all the electrical bits etc. first). ...
16
votes
3answers
1k views

What causes these 'bite marks' that appear consistently on new bricks?

I purchased a set (second hand) which has the following defects on the 75°-sloped, inverted 2x1x3 blocks: I assumed they were teeth-marks and asked the seller for replacements, and he found and ...
16
votes
2answers
870 views

Why are LEGO slope bricks textured?

Why is the slope part of bricks textured instead of the usual flat & glossy edge? Are there any non-textured forms of these bricks?
15
votes
4answers
15k views

What are the dimensions of a LEGO brick?

What are the real world dimensions of bricks? (starting with 1x1 brick) Plates? Studs? Does LEGO think of this in metric or imperial units or something else?
15
votes
1answer
1k views

How can I determine the name of a brick?

Over the vast years of collecting bricks of various sizes and sets, I find that during my free builds I run low on a specific type. How can I go about identifying what the brick is named and what ...
14
votes
1answer
431 views

Is there a convention for part and/or set numbers?

Is there any rhyme or reason to the way LEGO part are named? Failing that, is there any other sort of taxonomy that we can use to find specific parts? Along the same lines, my impression is that ...
14
votes
1answer
895 views

What does imprinted information inside bricks mean?

I just randomly checked the imprinted information inside some of the bricks in my Lego sets and found that it varied. I found several different types of information: Most pieces have Lego copyright ...
13
votes
10answers
2k views

What pieces are prone to breaking?

I've had a few pieces break over the years, which was a real bummer as I was not expecting them to. What are some commonly used pieces that are prone to breaking? Pieces that should be handled ...
13
votes
2answers
570 views

What are the arched things above a wheel called?

I have a bunch of second hand bricks and some are "wheel wells" for the lack of better words. I would like to find out how I use them for example at bricklink, but then I need to find the name for ...
13
votes
2answers
2k views

Why does LEGO now use studless technic designs?

It seems to me that sometime between 1998 and 2006 (between the Mindstorms RCX and NXT), LEGO switched from using studded technic bricks (like this:) to studdless beams (like this): In my ...
12
votes
3answers
337 views

How to find out if an element is out of production

Is there a way to know if Lego has officially stopped making a certain Lego element? As an example, from the 580 Lego set, I haven't seen this conveyor belt (along with those wheels and the ...
12
votes
2answers
2k views

Is it possible to change the battery in a 54604 light brick?

I got 4 of these in in a bulk lot of Lego, but the lamp is getting quite dim in a couple of them. Is it possible to change the battery in a 54604 light brick? It looks like the brick should open, ...
12
votes
1answer
876 views

Is there difference between different colors of LEGO axles?

There are a few different colors of LEGO Technic axles, but not enough to really use for artistic variation - black, grey, some beige, and recently I have started seeing blue. The particular color ...
11
votes
5answers
2k views

Are companies producing custom molded LEGO pieces legally entitled to do so?

We have seen (or I have seen, given I am a member of a few popular BIONICLE fan sites) an uproar from custom molding companies -- that is, companies that create their own LEGO pieces. My question is ...
11
votes
4answers
2k views

What is the rarest LEGO production element (colour/shape combination)?

What is the rarest LEGO element according to the following criteria: Genuine LEGO elements, not those available through third party vendors or otherwise modified elements. (So nothing from ...
11
votes
1answer
235 views

Why do the tubes in the Seattle Space Needle Architecture set need to be cut?

I just received the Seattle Space Needle from the Architecture series. There are tubes that the builder is required to cut to a certain length for the model. This is the first time I've encountered ...
10
votes
4answers
7k views

How much does a LEGO brick weigh?

I am trying to do a science project and I need the exact weight of one of the LEGO pieces. I am using it as a counter balance on my scale. What is the weight of a 1x4 LEGO brick?
10
votes
0answers
300 views

What's the exact opacity and translucency of transparent bricks?

As answered in this question, transparent bricks are made of PC (polycarbonate) and as listed in this answer and on Brickipedia there are fourteen transparent colors: 40 Transparent (clear) 41 ...
9
votes
3answers
333 views

Any reasons for the introduction of the new-style raised arch?

The new-style raised arch (to the left, 92950) got introduced in 2009, and has been gradually replacing the old-style arch (to the right, 3455) across the board. However, after four years, not only ...
9
votes
1answer
669 views

What are all the different ways that LEGO pieces join together?

Has anyone made a list of all of the different types of connections between LEGO bricks? Obviously there's the stud connection - but there's also the ball and socket joint, the more recent ...
8
votes
8answers
1k views

Are there any mirrored LEGO bricks?

I recently built LEGO Creator 5770: Lighthouse Island which features a clever trick to build the lighthouse's lantern, using stickers on on a Slope Brick 2x2 and Slope Top 1x2x2/3: Step 54 from ...
8
votes
1answer
580 views

Why does the Erling brick have a ridge below its outward facing stud?

Why does the Erling brick (#4070) have a ridge below its outward facing stud? Whereas the more versatile and less common #87087 does not? The #87087 piece also has a better use in SNOT usage, as it ...
8
votes
3answers
3k views

How accurate is the ultrasound sensor when moving?

Can I use an ultrasound sensor while the Robot is moving, or will it give bad data?
8
votes
1answer
660 views

What are the angles used in angle connectors and liftarms?

LEGO makes Technic Angle Connectors, like these: (Here are names and part numbers). They also make angular liftarms, like these: (part 32348). That last part has an angle of 53.5 degrees. ...
8
votes
3answers
429 views

Does the basic 2 x 4 brick have a common nickname?

Some bricks, such as the Erling brick, seem to have common nicknames in the LEGO building community. As the basic 2 x 4 brick appears to be the foundation of the system, it is reasonable to suppose ...
8
votes
1answer
399 views

Which BIONICLE set did this mask came from?

I just unearthed a rather wealthy stash of semi-rare Great Kanohi masks. Never knew I collected them! Anyway, among them was this clear transparent Kaukau (Great Mask of Water Breathing): You may ...
8
votes
2answers
753 views

How is the LEGO plastic different from Megablok plastic?

It's obvious that LEGO has better quality control, but what about the plastic they use? Megabloks look cheap and the parts seem to vary in color in a side by side comparison next to LEGO brand ...
7
votes
4answers
702 views

does Lego make bricks with a stone, brick or concrete block design?

Does Lego make the bricks with a stone, brick or concrete block finish on the sides? I would like to use these for walls and buildings on a train layout. Thanks!
7
votes
2answers
877 views

Why does Lego restrict the number of colors per shape?

There are many shapes and many colors of Lego elements. Some color/shapes are rare and hard to find. Why does Lego restrict the number of colors available per shape?
7
votes
3answers
6k views

What is the average price per piece?

Some LEGO pieces are probably more expensive than others, but what is the average price per piece of LEGO pieces, when sold as part of a kit? Is there any place containing statistics or graphs about ...
7
votes
1answer
682 views

Why was the 1x1 round brick changed?

The first 1x1 round bricks had no lip, just like most bricks: Brick, Round 1 x 1 Old - No Bottom Lip A lip was then added: Brick, Round 1 x 1 Solid Stud Why? Later, a hole was added in the ...
7
votes
2answers
1k views

How does LEGO handle the breakage of Hero Factory sockets?

My son has a slowly growing collection of Hero Factory figures, and they have accumulated a consistent problem: socket connector cracking. The tips of the angular part of the limb which connects to a ...
7
votes
1answer
246 views

Can I take an old LEGO winch apart?

I have an old LEGO winch that looks like #73037 It has been "restrung" but it is very stiff and it looks like it has some of the old string stuck between the rotating and non-rotating parts. It ...
6
votes
1answer
312 views

What is the true angle of a cheese slope?

What is the true angle of a cheese slope? Bricklink lists it as "Slope 30 1 x 1 x 2/3" while LDraw and Peeron list it as "Slope Brick 31 1 x 1 x 2/3". Why do these sources disagree, and what is the ...
6
votes
2answers
775 views

How to sort complete sets from box of unsorted LEGO

My son has thousands of pieces of LEGO, but he has them all dumped in a box. Is there any way to figure out what sets they went to if I don't remember the names of them?
6
votes
1answer
235 views

How many styles of element separators has LEGO produced?

I used to use other LEGO elements to separate tightly bound pieces in my collection. My thumb nail and I were quite pleased when I first discovered an actual brick separator LEGO introduced to ease ...
6
votes
2answers
3k views

What are the exact dimensions of a DUPLO brick?

The dimensions of LEGO brick are documented well, but what about DUPLO bricks? If have only found the general statements that DUPLO is twice as large as LEGO but no exact numbers. What about the ...
6
votes
2answers
188 views

Which “Real World” Company was the first to have its' name featured in an actual (numbered) Lego set?

Excluding the Lego company, which "Real World" Company was the first to have its' name featured in an actual Lego set?
6
votes
1answer
252 views

How do they decide when to remove an element from production, and what happens to the molds when they are retired?

We all know certain LEGO elements are no longer being produced. How do they decide when to remove an element from production, and what happens to the molds when they are retired?
6
votes
1answer
187 views

Why are 2/3 height bricks with studs on the side 2 studs deep?

This question is regarding the 2/3 height bricks with studs on the side. The two that I am aware of are 99206 and 87609: If you haven't seen them before, these are functionally somewhat similar to ...
6
votes
1answer
905 views

How many hours of travel does it take to wear out LEGO monorail tires?

I've seen some pretty impressive LEGO tire driven/cushioned monorail displays that put miles of wear on the track and the train cars that ride on it. I'm hoping a monorail expert can tell me (about) ...
5
votes
2answers
243 views

Are those bowls genuine LEGO pieces?

I've been sieving through my video collection and came across a video from 2011. It's part of a series of Ninjago videos giving you tips on fun things you could do with the Spinners. At the end of the ...
5
votes
2answers
229 views

Parts in Lego Set

I am building an inventory of all my Lego pieces and I am looking for a website that can give the pieces in a set with only the set number. It would be easier if there was information for many Lego ...
5
votes
1answer
243 views

Will using a bright LED to light my MOC harm my LEGO?

I'm building a LEGO model and planning on lighting it with a bank of 5 battery operated LEDs. I know sunlight negatively affects several LEGO colors. Will a bright LED harm the elements in my MOC the ...
5
votes
1answer
193 views

Electric, Plug Holder 4.5V/12V what is it for?

I have seen the Electric, Plug Holder 4.5V/12V on bricklink a few times and have often wondered what it is for. According to Bricklink, it was only ever produced in Light Gray and appeared in 3 ...
5
votes
1answer
305 views

Are the older (hollow underneath) brick elements considered “collectable”?

I know. I know. All LEGO elements are collectable. I mean are the older, tubeless bricks valued above and beyond the fact that they are still viable pieces to build with?