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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.

Science & Technology Base Set

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9632 Science & Technology Base Set

349 pieces in 81 part and color combinations, plus 2 minifigures.

LEGO counts 352 pieces. This inventory comes from a separate parts catalog and lists 357, including the 8 parts inside the minifigures; 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 64 pieces

  • Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Black Part 6558 Element 655826 ×8
  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 ×24
  • Technic Pin 3/4 Dark Bluish Gray Part 32002 Element 32002199 or 4211050 ×6
  • Technic Pin Long without Friction Ridges - Single Slot Light Bluish Gray Part 32556a Element 4211709 ×2
  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Red Part 32054 Element 4140806 or 4125198 ×14
  • Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×10

Technic Axles 44 pieces

  • Technic Axle 10 Black Part 3737 Element 373726 ×2
  • Technic Axle 12 Black Part 3708 Element 370826 ×2
  • Technic Axle 4 Black Part 3705 Element 370526 ×8
  • Technic Axle 6 Black Part 3706 Element 370626 ×2
  • Technic Axle 8 Black Part 3707 Element 370726 ×2
  • Technic Axle 3 with Stud Dark Bluish Gray Part 6587 Element 6587199 or 6129590 ×4
  • Technic Axle 3 Light Bluish Gray Part 4519 Element 4211815 ×8
  • Technic Axle 5 Light Bluish Gray Part 32073 Element 32073194 or 4211639 ×4
  • Technic Axle 2 Notched Red Part 32062 Element 4142865 ×12

Technic Beams 34 pieces

  • Technic Beam 1 x 11.5 Double Bent Thick Blue Part 32009 Element 6271153 or 4112000 ×2
  • Technic Beam 1 x 9 Bent (6 - 4) Thick Blue Part 6629 Element 6279882 or 4182884 ×4
  • Technic Beam 2 x 4 L-Shape Thick Blue Part 32140 Element 6271829 or 4168114 ×8
  • Technic Beam Triangle Thin [Type I] Dark Bluish Gray Part 2905 Element 4210689 ×2
  • Technic Beam 1 x 15 Thick White Part 32278 Element 4542578 or 4227533 ×8
  • Technic Beam 1 x 3 Thick White Part 32523 Element 6632140 or 4208160 ×2
  • Technic Beam 1 x 5 Thick White Part 32316 Element 4249021 or 4140465 ×2
  • Technic Beam 1 x 7 Thick White Part 32524 Element 6564912 or 6318056 ×2
  • Technic Beam 1 x 9 Thick White Part 40490 Element 6001831 or 4156341 ×4

Technic Bushes 32 pieces

  • Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 ×16
  • Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Yellow Part 32123b Element 6271167 or 3212324 ×16

Technic Connectors 32 pieces

  • Technic Axle and Pin Connector Angled #3 - 157.5° Black Part 32016 Element 6261386 or 4107082 ×4
  • Technic Axle Connector Ridged [with x Hole x Orientation] Light Bluish Gray Part 6538b Element 4211543 ×8
  • Technic Axle Connector with Axle Hole Red Part 32039 Element 4118897 ×10
  • Technic Axle and Pin Connector Angled #2 - 180° Red Part 32034 Element 6351572 or 4234429 ×4
  • Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Red Part 42003 Element 6273712 or 4175442 ×4
  • Technic Pin Connector Round [No Slot] Red Part 75535 Element 75854 ×2

Technic Gears 28 pieces

  • Technic Worm Gear Black Part 4716 Element 6037533 or 471626 ×2
  • Technic Gear 12 Tooth Bevel Light Bluish Gray Part 6589 Element 6589194 or 4565450 ×6
  • Technic Gear 16 Tooth with Round Holes [Old Style] Light Bluish Gray Part 4019 Element 4562487 or 4211563 ×2
  • Technic Gear 24 Tooth Crown with Reinforcements [New Style] Light Bluish Gray Part 3650c Element 4211434 ×4
  • Technic Gear 24 Tooth [New Style with Single Axle Hole] Light Bluish Gray Part 3648b Element 4211565 ×4
  • Technic Gear 40 Tooth Light Bluish Gray Part 3649 Element 6195314 or 4285634 ×2
  • Technic Gear 8 Tooth Light Bluish Gray Part 3647 Element 4211432 or 3647194 ×6
  • Technic Gear Rack 1 x 4 Light Bluish Gray Part 3743 Element 6457283 or 4211450 ×2

Wheels and Tyres 24 pieces

  • Technic Wedge Belt Wheel Tire Black Part 2815 Element 6028041 or 281526 ×4
  • Tyre 30.4 x 14 Offset Tread Black Part 30391 Element 4140670 or 3039126 ×4
  • Tyre 43.2 x 22 ZR Black Part 44309 Element 4184286 ×4
  • Technic Wedge Belt Wheel [aka Pulley] Light Bluish Gray Part 4185 Element 6321743 or 4494222 ×4
  • Wheel 18mm x 14mm with Axle Hole, Fake Bolts and Shallow Spokes Light Bluish Gray Part 55982 Element 4490127 ×4
  • Wheel 30.4 x 20 without Pinholes, with Reinforced Rim Light Bluish Gray Part 56145 Element 4297210 ×4

Technic Bricks 22 pieces

  • Technic Brick 1 x 12 [11 Pin Holes] Blue Part 3895 Element 389523 ×2
  • Technic Brick 1 x 16 [15 Pin Holes] Blue Part 3703 Element 370323 ×4
  • 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 ×4
  • Technic Brick 1 x 6 [5 Pin Holes] Blue Part 3894 Element 389423 ×2
  • Technic Brick 1 x 8 [7 Pin Holes] Blue Part 3702 Element 370223 ×4
  • Technic Brick 1 x 2 with Axle Hole Type 2 [X Opening] White Part 32064b ×2

Plates Special 16 pieces

  • Technic Plate 2 x 4 [3 Holes] Blue Part 3709 Element 370923 ×6
  • Technic Plate 2 x 6 [5 Holes] Blue Part 32001 Element 4114027 or 3200123 ×8
  • Technic Plate 2 x 8 [7 Holes] Blue Part 3738 Element 373823 ×2

Plates 12 pieces

  • Plate 1 x 2 Blue Part 3023 Element 302323 ×8
  • Plate 1 x 4 Blue Part 3710 Element 371023 ×4

String, Bands and Reels 12 pieces

  • String Cord Thin (0.5mm) 200cm Black Part 56823c200 Element 4276325 or 71162 ×1
  • String with End Studs 21L Overall Black Part 14226c21 Element 4109617 ×4
  • Technic Reel 3 x 2 Blue Part 32012 Element 4107179 ×1
  • Technic Rubber Belt Medium [24mm ID] [Round Cross Section] Red Part 85544 Element 4544145 or 4544143 ×2
  • Rubber Belt Small [15mm ID] [Round Cross Section] White Part 85543 Element 6699001 or 4580665 ×2
  • Technic Rubber Belt Large [33mm ID] [Round Cross Section] Yellow Part 85546 Element 4544151 or 70905 ×2

Magnets and Holders 6 pieces

  • Magnet Cylindrical Black Part 73092 Element 73092 ×3
  • Magnet Holder 2 x 3 Black Part 2607 Element 260726 ×3

Non-System Parts 6 pieces

  • Science & Technology Panel - Circle Large Trans-Dark Blue Part 57046a ×1
  • Science & Technology Panel - Circle Small Trans-Dark Blue Part 57046b ×1
  • Science & Technology Panel - Curved Trans-Dark Blue Part 57046c ×1
  • Science & Technology Panel - Triangle Large Trans-Dark Blue Part 57046d ×1
  • Science & Technology Panel - Triangle Medium Trans-Dark Blue Part 57046e ×1
  • Science & Technology Panel - Triangle Small Trans-Dark Blue Part 57046f ×1

Gear Parts 4 pieces

  • Storage Bin, Dacta, Medium [New Style] Blue Part 54187 ×1
  • Storage Bin Lid, Dacta [For New Style Trays] Trans-Clear Part 54190 ×1
  • Storage / Sorting Tray, Dacta [For New Style Storage Bins] White Part 54358 ×1
  • Storage / Sorting Tray, Dacta, 13 Cups [For New Style Storage Bins] White Part 54572 ×1

Technic Beams Special 4 pieces

  • Technic Beam 3 x 0.5 Liftarm with Boss and Pin / Crank Light Bluish Gray Part 33299a Element 4211688 ×4

Technic Special 4 pieces

  • Technic Cam Dark Bluish Gray Part 6575 Element 6575199 or 4210759 ×4

Bricks Round and Cones 2 pieces

  • Brick Round 2 x 2 with Axle Hole White Part 3941 Element 6601920 or 614351 ×2

Tiles 2 pieces

  • Tile 1 x 4 with Groove White Part 2431 Element 6548255 or 243101 ×2

Bricks Special 1 piece

  • Brick Special 2 x 6 x 2 Weight with Sealed Bottom and Dimples on Ends Black Part 73090b Element 6094053 or 73843 ×1

Minifigures 2 figures

  • White Torso with Flowers, Orange Legs, Black Ponytail (3626b Head) Minifigure, checked as a whole figure ×1
  • White Torso with Surfboard, Green Legs, Red Cap (3626b Head) Minifigure, checked as a whole figure ×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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