Basic Building Set (740-1) is a Basic LEGO set released in 1985 with 530 pieces. Browse the parts list, minifigures, and verify loose bricks with our free scanner. Collectors browsing Basic sets use this inventory to verify loose parts, compare color variants, and read official build manuals without downloading PDFs. This set includes 143 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
1985 (41 years ago — may be retired)
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Catalog scale
530 parts listed · 143 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.)
~1,184 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
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Market value
No estimate on BrickID yet
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Parts in this set
143 parts · page 1 of 3 · updating…
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Baseplate 16 x 323857 · ×1 · Light Gray -
![Battery Box, 4.5V, 4 x 24, 3 x C-Cell with Switch [Complete Assembly]](https://cdn.rebrickable.com/media/parts/ldraw/7/73264c01.png)
Battery Box, 4.5V, 4 x 24, 3 x C-Cell with Switch [Complete Assembly]4350c02 · ×1 · Light Gray -
Bracket 2 x 2 - 2 x 23956 · ×2 · Black -
Brick 1 x 13005 · ×6 · Trans-Clear -
Brick 1 x 13005 · ×8 · Red -
Brick 1 x 13005 · ×16 · Yellow -
Brick 1 x 23004 · ×16 · Yellow -
Brick 1 x 23004 · ×8 · Red -
Brick 1 x 33622 · ×6 · Red -
Brick 1 x 33622 · ×12 · Yellow -
Brick 1 x 43010 · ×6 · Red -
Brick 1 x 43010 · ×10 · Yellow -
Brick 1 x 63009 · ×12 · Yellow -
Brick 1 x 63009 · ×10 · Red -
Brick 1 x 83008 · ×4 · Red -
Brick 1 x 83008 · ×4 · Yellow -
Brick 2 x 23003 · ×8 · Red -
Brick 2 x 23003 · ×5 · Yellow -
Brick 2 x 33002 · ×4 · Red -
Brick 2 x 43001 · ×1 · Yellow -
Brick 2 x 43001 · ×5 · Red -
Brick 2 x 83007 · ×2 · Yellow -
Brick Round 1 x 1 Open Stud3062b · ×6 · Black -
Brick Round 2 x 2 with Axle Hole3941 · ×4 · Black -
Brick Sloped 33° 3 x 14286 · ×4 · Yellow -
Brick Sloped 33° 3 x 23298 · ×3 · Yellow -
Brick Sloped 45° 2 x 1 Double / Inverted with Hollow Bottom3049c · ×1 · Red -
Brick Sloped 45° 2 x 1 Double with Ovoid Bottom Pin3044b · ×1 · Red -
Brick Sloped 45° 2 x 1 with Bottom Pin3040b · ×6 · Red -
Brick Sloped 45° 2 x 1 with Bottom Pin3040b · ×8 · Yellow -
Brick Sloped 45° 2 x 23039 · ×12 · Red -
Brick Sloped 45° 2 x 23039 · ×2 · Yellow -
Brick Sloped 45° 2 x 2 Double3043 · ×2 · Red -
Brick Sloped 45° 2 x 2 Double Concave3046a · ×12 · Red -
Brick Sloped 45° 2 x 2 Double Convex3045 · ×2 · Yellow -
Brick Sloped 45° 2 x 33038 · ×8 · Red -
Brick Sloped 45° 2 x 43037 · ×8 · Red -
Brick Sloped 45° 2 x 43037 · ×4 · Yellow -
Brick Sloped 45° 2 x 4 Double3041 · ×1 · Red -
Brick Sloped 45° 2 x 84445 · ×6 · Red -
Brick Sloped Inverted 33° 3 x 2, No Connections between Studs, Ovoid Bottom Pin3747a · ×5 · Red -
Brick Sloped Inverted 33° 3 x 2, No Connections between Studs, Ovoid Bottom Pin3747a · ×3 · Yellow -
Brick Sloped Inverted 34° 3 x 1 without Internal Stopper4287a · ×4 · Red -
Brick Sloped Inverted 34° 3 x 1 without Internal Stopper4287a · ×2 · Yellow -
Brick Sloped Inverted 45° 2 x 13665 · ×18 · Red -
Brick Sloped Inverted 45° 2 x 13665 · ×6 · Yellow -
![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 · ×4 · Red -
![Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes]](https://cdn.rebrickable.com/media/parts/elements/366024.jpg)
Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes]3660 · ×2 · Yellow