Brick Parts Guide: Every LEGO Part Type Explained
When you first start building MOCs, a parts list can look like a foreign language. What is the difference between a "1x2 brick" and a "1x2 plate"? And what exactly are tiles and plates?
Don't worry — this guide walks you through the whole classification system for brick parts. Get these categories straight and your ability to read a plan improves by roughly 80%.
1. Why Learn How Parts Are Categorized?
Knowing the categories is not just about naming things. It helps you:
- Pick parts fast: you know where to look when a step calls for something specific
- Read plans properly: parts lists and step images stop looking like a riddle
- Design better: choosing the right part type makes a model sturdier and cleaner
- Buy accurately: you can describe exactly what you need on a second-hand marketplace or in a parts shop
2. The Six Main Categories
1. Bricks
Key trait: a brick is three plates tall — the workhorse of any build.
| Common type | How it looks | Typical use |
|---|---|---|
| 1x1 brick | a single small cube | filling gaps, decoration, texture detail |
| 1x2 brick | two studs wide | the most-used basic brick |
| 1x4 brick | four studs wide | walls, beams, columns |
| 1x6 / 1x8 brick | longer | wide spans |
| 2x2 brick | square | corners, load-bearing walls |
| 2x4 brick | the standard brick | LEGO's most iconic part |
MOC tip: one long brick (1x6 or 1x8) holds better than several short bricks butted together, but short bricks are how you build a bumpy, textured surface.
2. Plates
Key trait: a plate is one third of a brick in height — the fine-tuning magician.
| Common type | Use |
|---|---|
| 1x1 plate | adjusting height by a hair, filling gaps |
| 1x2 plate | the most-used plate |
| 1x4 / 1x6 plate | wall decoration, roofing |
| 2x2 plate | square filling |
| 2x4 plate | floors, bases |
| 2x6 / 2x8 plate | large baseplates |
MOC tip: three plates stacked equal the height of one brick. This 3:1 ratio is the single most useful adjustment trick in MOC building.
3. Tiles
Key trait: no studs on top — the surface is completely smooth.
What they are for:
- floors, tabletops, roads
- decorative walls (a smooth face looks more realistic)
- carrying printed text or patterns
- the surface a minifigure stands on
Common sizes: 1x1 tile, 1x2 tile, 1x4 tile, 2x2 tile, 2x4 tile
MOC tip: in architectural MOCs, tiled floors look far more convincing than plain bricks. In cyberpunk scenes, tiles plus transparent parts equal neon lighting.
4. Slopes
Key trait: parts with an angled face, used for roofs, car noses, wings and more.
| Common type | Angle | Use |
|---|---|---|
| 30° slope | 30 degrees | roofs, ramps |
| 45° slope | 45 degrees | car fronts, castle roofs |
| inverted slope | slopes the other way | underside of eaves |
| curved slope | curved surface | rounded shapes |
MOC tip: use 45° slopes for castle roofs and 30° slopes for modern architecture — the result matches real-world proportions much better.
5. Technic Elements
Key trait: parts with holes and pins, used for mechanical structures and moving features.
Core parts:
- Technic bricks and beams: hole-punched beam parts, the skeleton of a build
- Pins: the connectors that join Technic beams
- Gears: drive and steering
- Axles: transferring rotational movement
- Linkages: parallelogram mechanisms
- Tracks: tanks, excavators and similar
MOC tip: mech MOCs need Technic parts at the joints. Joints built from basic bricks alone simply cannot carry the load.
6. Special Elements
Key trait: the odd-shaped parts that fit nowhere else, each with a very specific job.
| Type | Examples | Use |
|---|---|---|
| Door and window frames | doors and windows in many sizes | building openings |
| Fences and railings | 1x2x2 fence | balconies, barriers |
| Wheels and tires | many sizes | vehicles |
| Plants | leaves, flowers, trees | natural scenes |
| Minifigure accessories | weapons, tools, hats | dressing figures |
| Printed parts | bricks and plates with patterns | decoration, signage |
| Transparent parts | bricks in clear colors | windows, lighting effects, magic |
3. A Guide to Part Colors
The color range of brick parts is enormous. Here is how the common ones break down:
| Color family | Common colors | Where it works |
|---|---|---|
| Neutral | white, black, gray, dark gray | building bodies, mechs, vehicles |
| Warm | red, orange, yellow, brown | castles, vehicles, fire |
| Cool | blue, light blue, green, purple | water, sci-fi, cyberpunk |
| Special | transparent, pearl, metallic | windows, effects, decoration |
MOC tip: beginners should stick to 3-4 colors so the palette stays coherent. Classic combinations:
- Architecture: white + gray + brown (natural look)
- Mechs: gray + black + red (combat look)
- Sci-fi: silver-gray + blue + transparent blue (tech look)
4. The BrickLink Part Number System
If you plan to buy parts online, BrickLink part numbers are the worldwide ID card for a part.
Format examples:
3001 - 2x4 Brick
3003 - 1x1 Brick
3023 - 1x2 Plate
3068 - 2x2 Tile
How to find a part number:
- In BrickLink Studio, right-click the part and choose "Part ID"
- Search the part description on the BrickLink website
- Check the parts list in your instructions
5. Buying Advice for New Builders
Starter Pack (roughly 500 CNY budget)
Bricks (about 40%):
- 2x4 brick (50 each in white, gray and black)
- 1x2 brick (50 each in white and gray)
- 1x1 brick (30 each in white and gray)
Plates (about 30%):
- 2x4 plate (30 each in white and gray)
- 1x2 plate (30 each in white and gray)
- 1x1 plate (20 each in white and gray)
Tiles (about 15%):
- 1x2 tile (20 each in white and gray)
- 2x2 tile (10 each in white and gray)
Slopes (about 10%):
- 45° slope (10 each in gray and red)
Special elements (about 5%):
- transparent parts, windows and wheels, bought as needed
Money-saving trick: find a plan you like on BrickPlan, check its parts list, then buy exactly that full list in one order instead of stockpiling at random.
6. Common Questions
Q: How do I tell a brick from a plate? A: Look at the height. A brick is three plates tall. The quickest test: the side of a brick has three raised ridges, a plate has only one.
Q: Why won't my parts clutch tightly? A: It may be a batch issue (different brands use molds of different precision), or simply worn parts. The safest approach is to mix parts from the same brand.
Q: What is SNOT? A: SNOT means Studs Not On Top — a technique where parts are attached sideways instead of upward. It is extremely common for building facades and mech detailing.
Part knowledge is the foundation of MOC building. Get the foundation right and your ideas above it can grow freely. Bookmark this page and come back to it whenever you are building.