Universal Building Set (733-1) is a Universal Building Set LEGO set released in 1980 with 504 pieces. Browse the parts list, minifigures, and verify loose bricks with our free scanner. Collectors browsing Universal Building Set sets use this inventory to verify loose parts, compare color variants, and read official build manuals without downloading PDFs. This set includes 140 unique part types.
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Buying checklist
Quick context before you buy this set used or verify a marketplace listing.
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Release year
1980 (46 years ago — may be retired)
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Catalog scale
504 parts listed · 140 inventory lines tracked
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Minifigures
No minifigs in inventory (brick-only or Technic set)
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Build manual
No digital manual in our catalog — check the box tab or LEGO.com
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Build complexity
Large set — expect sticker sheets or multiple subassemblies; inspect photos closely
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Gray era
Pre-2004 set — may use old light/dark gray instead of bluish gray
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Shipping weight (est.)
~1,144 g for parts inventory (excludes box/minifig packaging)
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Before you buy used
Run the completion checker, compare photos to the inventory, and check live listings for sealed pricing
Related sets in this theme
Market value
No estimate on BrickID yet
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Parts in this set
140 parts · page 1 of 3 · updating…
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Antenna 1 x 4 with Rounded Top3957a · ×1 · Light Gray -
Baseplate 32 x 323811 · ×1 · Green -
Bracket 2 x 2 - 2 x 23956 · ×2 · Light Gray -
Brick 1 x 13005 · ×16 · Red -
Brick 1 x 13005 · ×4 · Blue -
Brick 1 x 23004 · ×23 · Red -
Brick 1 x 23004 · ×4 · Trans-Clear -
Brick 1 x 23004 · ×8 · Blue -
Brick 1 x 33622 · ×8 · Red -
Brick 1 x 33622 · ×4 · Blue -
Brick 1 x 43010 · ×4 · Blue -
Brick 1 x 43010 · ×21 · Red -
Brick 1 x 43010 · ×2 · Trans-Clear -
Brick 1 x 63009 · ×6 · Blue -
Brick 1 x 63009 · ×18 · Red -
Brick 1 x 83008 · ×4 · Blue -
Brick 1 x 83008 · ×14 · Red -
Brick 2 x 2 without Inside Ridges3003a · ×2 · Red -
Brick 2 x 2 without Inside Ridges3003a · ×2 · Blue -
Brick 2 x 3 without Cross Supports3002a · ×2 · Blue -
Brick 2 x 3 without Cross Supports3002a · ×2 · Red -
Brick 2 x 4 without Cross Supports3001a · ×1 · Blue -
Brick 2 x 4 without Cross Supports3001a · ×2 · Red -
Brick Round 1 x 1 Open Stud3062b · ×2 · Trans-Yellow -
Brick Round 1 x 1 Open Stud3062b · ×4 · Light Gray -
Brick Round 2 x 2 with Axle Hole3941 · ×2 · Light Gray -
Brick Sloped 33° 3 x 23298 · ×3 · Blue -
Brick Sloped 33° 3 x 63939 · ×1 · Trans-Clear -
Brick Sloped 45° 2 x 1 Double / Inverted with Hollow Bottom3049c · ×2 · Blue -
Brick Sloped 45° 2 x 1 Double without Bottom Pin3044a · ×2 · Blue -
Brick Sloped 45° 2 x 1 Triple with Hollow Underside3048a · ×2 · Blue -
Brick Sloped 45° 2 x 1 with Bottom Pin3040b · ×4 · Red -
Brick Sloped 45° 2 x 1 with Bottom Pin3040b · ×4 · Blue -
Brick Sloped 45° 2 x 23039 · ×8 · Blue -
Brick Sloped 45° 2 x 23039 · ×3 · Trans-Clear -
Brick Sloped 45° 2 x 2 Double3043 · ×2 · Blue -
Brick Sloped 45° 2 x 2 Double Concave3046a · ×8 · Blue -
Brick Sloped 45° 2 x 2 Double Convex3045 · ×8 · Blue -
Brick Sloped 45° 2 x 33038 · ×4 · Blue -
Brick Sloped 45° 2 x 3 Double3042 · ×1 · Blue -
Brick Sloped 45° 2 x 43037 · ×16 · Blue -
Brick Sloped 45° 2 x 4 Double3041 · ×3 · Blue -
Brick Sloped 65° 2 x 2 x 2 Smooth without Bottom Tube3678a · ×4 · Trans-Clear -
Brick Sloped Inverted 33° 3 x 2, No Connections between Studs, Ovoid Bottom Pin3747a · ×3 · Blue -
Brick Sloped Inverted 45° 2 x 13665 · ×10 · Blue -
Brick Sloped Inverted 45° 2 x 13665 · ×8 · Red -
![Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes]](https://cdn.rebrickable.com/media/parts/elements/366021.jpg)
Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes]3660 · ×2 · Red -
![Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes]](https://cdn.rebrickable.com/media/parts/elements/366023.jpg)
Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes]3660 · ×12 · Blue