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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

8050 Universal Building Set

142 pieces in 41 part and color combinations.

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

Light Gray 61 pieces

  • Battery Box, 4.5V, 4 x 24, 3 x C-Cell with Switch [Complete Assembly] Light Gray Part 4350c02 ×1
  • Electric Connector, 2 Way Male Squared Narrow Long [Complete Assembly] Light Gray Part 766c01 ×2
  • Motor, 4.5V Type 2 for 2-Prong Connectors with Middle Pin Light Gray Part 6216b ×1
  • Technic Axle Pin without Friction Ridges Lengthwise Light Gray Part 3749 Element 4184168 or 4154179 ×4
  • Technic Axle and Pin Connector Light Gray Part 3651 Element 4105243 or 365102 ×8
  • Technic Bush Light Gray Part 3713 Element 4125313 or 659002 ×9
  • 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 40 Tooth Light Gray Part 3649 Element 364902 ×1
  • Technic Gear 8 Tooth Light Gray Part 3647 Element 364702 ×4
  • Technic Gear Rack 1 x 4 Light Gray Part 3743 Element 374302 ×1
  • Technic Pin without Friction Ridges Lengthwise Light Gray Part 3673 Element 4184166 or 367302 ×11
  • Technic Plate 1 x 8 with Toothed Ends Light Gray Part 4442 Element 444252 or 444202 ×3
  • Technic Steering Arm Light Gray Part 4261 Element 4225506 or 4189316 ×2
  • Technic Steering Pulley Large Light Gray Part 3736 Element 373602 ×1
  • Technic Universal Joint 4L [Complete Assembly] Light Gray Part 9244 Element 9244 ×1
  • Technic Wedge Belt Wheel [aka Pulley] Light Gray Part 4185 Element 4100502 or 418502 ×2
  • Tile 1 x 2 with Groove Light Gray Part 3069b Element 306902 ×2
  • Wheel with Split Axle hole Light Gray Part 3482 Element 348202 ×4
  • Wire 12V / 4.5V with Two Leads [Undetermined Length] Light Gray Part 74503 ×1

Blue 41 pieces

  • Plate 1 x 2 Blue Part 3023 Element 302323 ×6
  • Plate 1 x 6 Blue Part 3666 Element 366623 ×8
  • Technic Brick 1 x 12 [11 Pin Holes] Blue Part 3895 Element 389523 ×4
  • Technic Brick 1 x 16 [15 Pin Holes] Blue Part 3703 Element 370323 ×8
  • Technic Brick 1 x 2 [1 Pin Hole] Blue Part 3700 Element 370023 ×4
  • Technic Brick 1 x 4 [3 Pin Holes] Blue Part 3701 Element 370123 ×2
  • Technic Brick 1 x 6 [5 Pin Holes] Blue Part 3894 Element 389423 ×4
  • Technic Brick 1 x 8 [7 Pin Holes] Blue Part 3702 Element 370223 ×5

Black 31 pieces

  • String Cord Medium Thickness 50cm Black Part 7916c50 ×1
  • Technic Axle 10 Black Part 3737 Element 373726 ×1
  • Technic Axle 12 Black Part 3708 Element 370826 ×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 Pin with Friction Ridges Lengthwise, without Center Slots Black Part 4459 ×12
  • Technic Rubber Belt Medium [26mm ID] [Round Cross Section] Black Part 85545 ×2
  • Tyre 43 x 17 Black Part 3634 Element 4523564 or 363426 ×4

Red 9 pieces

  • Plate 2 x 6 Red Part 3795 Element 379521 ×4
  • Plate 4 x 6 Red Part 3032 Element 303221 ×1
  • Technic Plate 2 x 4 [3 Holes] Red Part 3709 Element 370921 ×3
  • Technic Plate 2 x 8 [7 Holes] Red Part 3738 Element 373821 ×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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