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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 with Flex System

Checking

8074 Universal Building Set with Flex System

317 pieces in 73 part and color combinations.

LEGO counts 313 pieces. This inventory comes from a separate parts catalog and lists 317; 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

Technic Pins 49 pieces

  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 ×18
  • Technic Axle Pin without Friction Ridges Lengthwise Light Gray Part 3749 Element 4184168 or 4154179 ×12
  • Technic Pin 1/2 without Friction Ridges Light Gray Part 4274 Element 427402 ×12
  • Technic Pin without Friction Ridges Lengthwise Light Gray Part 3673 Element 4184166 or 367302 ×7

Plates 46 pieces

  • Plate 1 x 2 Black Part 3023 Element 302326 ×11
  • Plate 1 x 4 Black Part 3710 Element 371026 ×8
  • Plate 1 x 6 Black Part 3666 Element 366626 ×2
  • Plate 1 x 8 Black Part 3460 Element 346026 ×2
  • Plate 2 x 2 Black Part 3022 Element 302226 ×4
  • Plate 2 x 2 Corner Black Part 2420 Element 242026 ×2
  • Plate 1 x 1 Yellow Part 3024 Element 302424 ×2
  • Plate 1 x 2 Yellow Part 3023 Element 302324 ×3
  • Plate 1 x 4 Yellow Part 3710 Element 371024 ×8
  • Plate 1 x 6 Yellow Part 3666 Element 366624 ×2
  • Plate 2 x 6 Yellow Part 3795 Element 379524 ×2

Technic Bricks 46 pieces

  • Technic Brick 1 x 10 [9 Pin Holes] Black Part 2730 Element 273026 ×2
  • Technic Brick 1 x 12 [11 Pin Holes] Black Part 3895 Element 389526 ×2
  • 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 ×8
  • Technic Brick 1 x 4 [3 Pin Holes] Black Part 3701 Element 370126 ×8
  • Technic Brick 1 x 6 [5 Pin Holes] Black Part 3894 Element 389426 ×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 16 [15 Pin Holes] Yellow Part 3703 Element 370324 ×4
  • Technic Brick 1 x 2 [1 Pin Hole] Yellow Part 3700 Element 370024 ×4
  • Technic Brick 1 x 4 [3 Pin Holes] Yellow Part 3701 Element 370124 ×2
  • 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 ×4

Technic Special 39 pieces

  • Technic Flex Cable End with Pin Connection [Old Style - No Clamp] Dark Gray Part 2900 ×20
  • Technic Flex Cable 11L Light Gray Part flex08c11 ×4
  • Technic Flex Cable 13L Light Gray Part flex08c13 ×1
  • Technic Flex Cable 19L Light Gray Part flex08c19 ×2
  • Technic Flex Cable 7L Light Gray Part flex08c07 ×2
  • Technic Flex Cable 9L Light Gray Part flex08c09 ×1
  • Technic Plate 1 x 4 with Toothed Ends Light Gray Part 4263 Element 4225508 or 4189319 ×2
  • Technic Plate 1 x 8 with Toothed Ends Light Gray Part 4442 Element 444252 or 444202 ×3
  • Technic Plate 1 x 5 with Toothed Ends, 2 Studs and Center Axle Hole Yellow Part 2711 Element 4280163 or 4225493 ×4

Technic Bushes 37 pieces

  • Technic Bush Light Gray Part 3713 Element 4125313 or 659002 ×12
  • Technic Bush 1/2 Toothed Type I [+ Opening] Light Gray Part 4265a Element 426502 ×25

Technic Axles 29 pieces

  • Technic Axle 10 Black Part 3737 Element 373726 ×4
  • Technic Axle 12 Black Part 3708 Element 370826 ×3
  • Technic Axle 2 Black Part 3704 Element 370426 ×2
  • Technic Axle 3 Black Part 4519 Element 6238084 or 451926 ×4
  • Technic Axle 4 Black Part 3705 Element 370526 ×6
  • Technic Axle 6 Black Part 3706 Element 370626 ×4
  • Technic Axle 8 Black Part 3707 Element 370726 ×6

Technic Gears 16 pieces

  • Technic Worm Gear Black Part 4716 Element 6037533 or 471626 ×2
  • Technic Gear 14 Tooth Bevel Light Gray Part 4143 Element 414352 or 414302 ×3
  • Technic Gear 16 Tooth with Round Holes [Old Style] Light Gray Part 4019 Element 4107176 or 401902 ×2
  • Technic Gear 24 Tooth Crown with Reinforcements [New Style] Light Gray Part 3650c Element 365002 ×2
  • Technic Gear 24 Tooth [Old Style - Three axle holes] Light Gray Part 3648a ×2
  • Technic Gear 8 Tooth Light Gray Part 3647 Element 364702 ×3
  • Technic Gear Rack 1 x 4 Light Gray Part 3743 Element 374302 ×1
  • Technic Turntable Large Type 1, 56 Tooth [Complete Assembly] Light Gray Part 2856c01 Element 74643 ×1

Technic Beams 15 pieces

  • Technic Beam 1 x 4 Thin with Stud Connector Light Gray Part 2825 Element 4107133 or 282502 ×15

Wheels and Tyres 12 pieces

  • Tyre 30 x 20 Solid Balloon Black Part 2857 ×4
  • Technic Wedge Belt Wheel [aka Pulley] Light Gray Part 4185 Element 4100502 or 418502 ×4
  • Wheel 20 x 30 Technic White Part 4266 Element 4248155 or 426601 ×4

Plates Special 9 pieces

  • Technic Plate 2 x 4 [3 Holes] Black Part 3709 Element 370926 ×3
  • 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 ×4

Technic Connectors 4 pieces

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

Tubes and Hoses 4 pieces

  • Hose Rigid 3mm D. 14L / 11.2cm Dark Gray Part 75c14 ×2
  • Hose Rigid 3mm D. 5L / 4.0cm Dark Gray Part 75c05 Element 4189401 or 4119069 ×1
  • Hose Rigid 3mm D. 6L / 4.8cm Dark Gray Part 75c06 Element 4188673 ×1

String, Bands and Reels 3 pieces

  • Rubber Band Small 13mm (Square Cross Section) Black Part 71509 Element 4141606 or 4107153 1 spare in the box ×2
  • String Cord Medium Thickness 100cm Black Part 14728c100 Element 6003316 or 4500573 ×1

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

Bricks Round and Cones 1 piece

  • Brick Round 2 x 2 with Axle Hole Trans-Yellow Part 3941 Element 6514285 or 6273155 ×1

Plates Round Curved and Dishes 1 piece

  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Light Gray Part 4032a Element 403202 ×1

Supports, Girders and Cranes 1 piece

  • Hook, Technic - Large Black Part 70496 Element 70644 ×1

Tiles Round and Curved 1 piece

  • Tile Round 2 x 2 with Bottom Cross Light Gray Part 4150 Element 415052 or 415002 ×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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