BlockTalk Find Your Set

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LEGO Missing Piece Checker

Rule out the usual hiding places first. If the piece really is gone, check the set piece by piece and leave with the element ID LEGO asks for, or a link to buy the part.

Universal Building Set

Checking

8040 Universal Building Set

162 pieces in 51 part and color combinations.

LEGO counts 163 pieces. This inventory comes from a separate parts catalog and lists 162; the two do not always count the same elements, so their totals differ. Spare parts are counted in neither figure.

Before you call it missing

Builders who report a missing piece often find it in one of these places. Tick each one off as you look.

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Piece checklist

Plates 42 pieces

  • Plate 1 x 2 Black Part 3023 Element 302326 ×7
  • Plate 1 x 4 Black Part 3710 Element 371026 ×2
  • Plate 2 x 3 Black Part 3021 Element 302126 ×4
  • Plate 2 x 6 Black Part 3795 Element 379526 ×2
  • Plate 1 x 2 Light Gray Part 3023 Element 302302 ×2
  • Plate 1 x 4 Light Gray Part 3710 Element 371002 ×4
  • Plate 1 x 8 Light Gray Part 3460 Element 346002 ×1
  • Plate 1 x 2 Yellow Part 3023 Element 302324 ×10
  • Plate 1 x 4 Yellow Part 3710 Element 371024 ×4
  • Plate 1 x 6 Yellow Part 3666 Element 366624 ×2
  • Plate 2 x 2 Yellow Part 3022 Element 4613978 or 302224 ×2
  • Plate 4 x 8 Yellow Part 3035 Element 303524 ×2

Technic Bricks 30 pieces

  • Technic Brick 1 x 16 [15 Pin Holes] Black Part 3703 Element 370326 ×2
  • Technic Brick 1 x 2 [1 Pin Hole] Black Part 3700 Element 370026 ×4
  • Technic Brick 1 x 8 [7 Pin Holes] Black Part 3702 Element 370226 ×2
  • Technic Brick 1 x 12 [11 Pin Holes] Yellow Part 3895 Element 6262393 or 389524 ×2
  • Technic Brick 1 x 2 [1 Pin Hole] Yellow Part 3700 Element 370024 ×8
  • Technic Brick 1 x 4 [3 Pin Holes] Yellow Part 3701 Element 370124 ×4
  • Technic Brick 1 x 6 [5 Pin Holes] Yellow Part 3894 Element 389424 ×2
  • Technic Brick 1 x 8 [7 Pin Holes] Yellow Part 3702 Element 370224 ×6

Technic Pins 22 pieces

  • Technic Pin with Friction Ridges Lengthwise, without Center Slots Black Part 4459 ×8
  • Technic Axle Pin without Friction Ridges Lengthwise Light Gray Part 3749 Element 4184168 or 4154179 ×6
  • Technic Pin without Friction Ridges Lengthwise Light Gray Part 3673 Element 4184166 or 367302 ×8

Technic Bushes 12 pieces

  • Technic Bush Light Gray Part 3713 Element 4125313 or 659002 ×10
  • Technic Bush 1/2 Toothed Type I [+ Opening] Light Gray Part 4265a Element 426502 ×2

Technic Axles 11 pieces

  • Technic Axle 10 Black Part 3737 Element 373726 ×2
  • Technic Axle 4 Black Part 3705 Element 370526 ×3
  • Technic Axle 6 Black Part 3706 Element 370626 ×4
  • Technic Axle 8 Black Part 3707 Element 370726 ×2

Technic Gears 11 pieces

  • Technic Gear 14 Tooth Bevel Light Gray Part 4143 Element 414352 or 414302 ×2
  • Technic Gear 24 Tooth Crown with Flat Teeth Light Gray Part 3650a ×1
  • Technic Gear 24 Tooth [Old Style - Three axle holes] Light Gray Part 3648a ×2
  • Technic Gear 8 Tooth Light Gray Part 3647 Element 364702 ×5
  • Technic Gear Rack 1 x 4 Light Gray Part 3743 Element 374302 ×1

Wheels and Tyres 9 pieces

  • Tyre 43 x 17 Black Part 3634 Element 4523564 or 363426 ×4
  • Technic Wedge Belt Wheel [aka Pulley] Light Gray Part 4185 Element 4100502 or 418502 ×1
  • Wheel with Split Axle hole Light Gray Part 3482 Element 348202 ×4

Technic Special 6 pieces

  • Technic Plate 1 x 4 with Toothed Ends Light Gray Part 4263 Element 4225508 or 4189319 ×3
  • Technic Plate 1 x 6 with Toothed Ends Light Gray Part 4262 Element 4240413 or 4109661 ×3

Plates Special 4 pieces

  • Technic Plate 2 x 4 [3 Holes] Yellow Part 3709 Element 370924 ×2
  • Technic Plate 2 x 8 [7 Holes] Yellow Part 3738 Element 4624216 or 373824 ×2

Pneumatics 4 pieces

  • Pneumatic Switch with Top Studs Light Gray Part 75215 Element 4190775 or 75215 ×1
  • Technic Pneumatic Distribution Block 2 x 4 [Complete Assembly] Light Gray Part 4692c01 ×1
  • Pneumatic Cylinder with 1 Inlet Medium (48mm) Red Part 4688c01 ×1
  • Pneumatic Pump Old Style Red Part 4701c01 ×1

Technic Connectors 4 pieces

  • Technic Axle and Pin Connector Light Gray Part 3651 Element 4105243 or 365102 ×4

Technic Steering, Suspension and Engine 2 pieces

  • Technic Steering Arm Light Gray Part 4261 Element 4225506 or 4189316 ×2

Tiles 2 pieces

  • Tile 1 x 2 with Groove Light Gray Part 3069b Element 306902 ×2

Tubes and Hoses 2 pieces

  • Hose, Pneumatic 4mm D. 76L Black Part 5102c76 ×1
  • Hose, Pneumatic 4mm D. 50L / 400mm Light Gray Part 5102c50 ×1

Bricks 1 piece

  • Brick 2 x 4 Black Part 3001 Element 300126 ×1

Tick each piece as you find it, or mark it missing.

When a piece really is missing

Ask LEGO

LEGO takes requests for pieces missing from a new set through its customer service site. The form asks for the set number and each piece's element ID, the number printed beside the piece in the parts list at the back of the instructions. This checker lists both.

Request a replacement from LEGO

Buy the piece

Mark a piece missing and your list links it to an eBay search for that part, which also covers pieces from older or second-hand sets.

Keep a record

Copy or download your missing list (the CSV opens in any spreadsheet), or print the whole checklist and tick pieces off on paper. Your marks stay in this browser, so you can check a big set over several sittings.

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