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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.

Ultimate Builders Set

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3800 Ultimate Builders Set

322 pieces in 70 part and color combinations.

LEGO counts 321 pieces. This inventory comes from a separate parts catalog and lists 322; 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

Black 148 pieces

  • Arm Piece with Pin, 2 Fingers Black Part 6048a Element 604826 ×4
  • Large Figure Throwing Disk, MindStorms Print Black Part 32171pr0062 ×6
  • Rubber Band Small 13mm (Square Cross Section) Black Part 71509 Element 4141606 or 4107153 ×4
  • String Cord Medium Thickness 200cm Black Part 14728c200 Element 4513695 ×1
  • Technic Axle 10 Black Part 3737 Element 373726 ×1
  • Technic Axle 2 Notched Black Part 32062 Element 4109810 or 3206226 ×5
  • Technic Axle 3 Black Part 4519 Element 6238084 or 451926 ×5
  • Technic Axle 5 Black Part 32073 Element 4114740 ×4
  • Technic Axle Connector with Axle Hole Black Part 32039 Element 4107081 or 3203926 ×4
  • Technic Axle and Pin Connector Angled #4 - 135° Black Part 32192 Element 6262897 or 4121610 ×2
  • Technic Axle and Pin Connector Perpendicular Black Part 6536 Element 6261371 or 4173668 ×6
  • Technic Axle and Pin Connector Perpendicular Double Black Part 32291 Element 6280394 or 4140430 ×4
  • Technic Beam 1 x 15 Thick Black Part 32278 Element 4542573 or 4128603 ×6
  • Technic Beam 1 x 3 Thin Black Part 6632 Element 6331723 or 4107828 ×4
  • Technic Beam 1 x 4 Thin Black Part 32449 Element 6327548 or 4142236 ×4
  • Technic Beam 2 x 4 L-Shape Thick Black Part 32140 Element 6271825 or 4120017 ×4
  • Technic Beam 3 x 5 L-Shape Thick Black Part 32526 Element 4142823 or 3252626 ×2
  • Technic Brick 1 x 1 with Pin Hole Black Part 6541 Element 654126 ×14
  • Technic Brick 1 x 8 [7 Pin Holes] Black Part 3702 Element 370226 ×4
  • Technic Pin Connector Plate 1 x 2 x 1 2/3 [Two Holes On Top] Black Part 32530 Element 4144024 ×6
  • Technic Pin Connector Plate with One Hole (Single on Bottom) Black Part 32529 Element 4144023 ×2
  • Technic Pin Connector Round [No Slot] Black Part 75535 Element 75619 ×4
  • Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Black Part 6558 Element 655826 ×26
  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 1 spare in the box ×20
  • Technic Turntable Large Type 1 Base, 56 Tooth Black Part 2856 Element 4490248 or 285626 ×1
  • Tyre 15 x 6 Offset Tread Small Black Part 3641 Element 4501046 or 364126 ×4
  • Wire with Brick 2 x 2 x 2/3 Pair, 69L Black Part 5306bc069 Element 75782 ×1

Light Gray 76 pieces

  • Motor, 9V Mini [Old Style] Light Gray Part 71427c01 Element 4107786 ×1
  • Plate Round 1 x 1 with Solid Stud Light Gray Part 6141 Element 614102 1 spare in the box ×36
  • Plate Special 1 x 2 with Door Rail Light Gray Part 32028 Element 4109642 ×4
  • Plate Special 2 x 2 with 2 Pin Holes Light Gray Part 2817 Element 281702 ×4
  • Pneumatic Switch with Top Studs Light Gray Part 75215 Element 4190775 or 75215 ×1
  • Technic Axle Connector with Axle Hole Light Gray Part 32039 Element 4106469 ×4
  • Technic Axle Pin without Friction Ridges Lengthwise Light Gray Part 3749 Element 4184168 or 4154179 ×6
  • Technic Beam 1 x 3 Thin Light Gray Part 6632 Element 4107825 ×2
  • Technic Beam 1 x 4 Thin with Stud Connector Light Gray Part 2825 Element 4107133 or 282502 ×2
  • Technic Bush 1/2 Smooth with Axle Hole Reduced Light Gray Part 32123a ×5
  • Technic Gear 12 Tooth Double Bevel Light Gray Part 32270 Element 4141454 or 4125322 ×3
  • Technic Gear 20 Tooth Bevel Light Gray Part 32198 Element 4206307 or 4121640 ×1
  • Technic Gear 20 Tooth Double Bevel with Axle Hole Type 2 [X Opening] Light Gray Part 32269 Element 4141455 ×3
  • Technic Gear Rack 1 x 4 Light Gray Part 3743 Element 374302 ×4

Blue 68 pieces

  • Pneumatic Pump 1 x 5.5 Blue Part 74982 ×1
  • Technic Axle Connector Ridged [with x Hole x Orientation] Blue Part 6538b Element 4113807 or 4107802 ×2
  • Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole Blue Part 32184 Element 4128599 ×4
  • Technic Beam 1 x 15 Thick Blue Part 32278 Element 6057799 or 4144299 ×5
  • Technic Beam 1 x 3 Thick Blue Part 32523 Element 4509376 or 4144284 ×6
  • Technic Beam 1 x 3 Thin Blue Part 6632 Element 6344176 or 4107829 ×2
  • Technic Beam 1 x 4 Thin Blue Part 32449 Element 6488701 or 4144283 ×4
  • Technic Beam 1 x 5 Thick Blue Part 32316 Element 4142134 or 4128591 ×8
  • Technic Beam 1 x 7 Bent (4 - 4) Thick Blue Part 32348 Element 6345498 or 6302340 ×2
  • Technic Beam 1 x 7 Thick Blue Part 32524 Element 4506043 or 4144285 ×4
  • Technic Beam 3 x 5 L-Shape with Quarter Ellipse Thin Blue Part 32250 Element 6371955 or 6339225 ×4
  • Technic Beam Triangle Thin [Type I] Blue Part 2905 Element 4254627 or 4142541 ×2
  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Blue Part 32054 Element 4140800 or 4107741 ×24

Dark Gray 8 pieces

  • Technic Axle 3 with Stud Dark Gray Part 6587 Element 4113884 or 658727 ×4
  • Technic Pin 3/4 Dark Gray Part 32002 Element 4109854 ×4

Trans-Clear 8 pieces

  • Hose, Pneumatic 4mm D. 195L Trans-Clear Part 5102c195 ×1
  • Pneumatic Cylinder with 2 Inlets Medium (48mm) with Black Top Trans-Clear Part 2793c01 Element 4144055 ×1
  • Technic Brick 4 x 6 with 2 x 4 Opening Trans-Clear Part 32531 Element 4144160 ×2
  • Technic Brick 6 x 8 with 4 x 6 Opening Trans-Clear Part 32532 Element 4144161 ×2
  • Technic Gearbox 2 x 4 x 3 1/3 Trans-Clear Part 6588 Element 6507887 or 6254290 ×1
  • Technic Turntable Large Type 1 Top, 56 Tooth Trans-Clear Part 2855 Element 4144289 or 4144287 ×1

White 6 pieces

  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) White Part 4032a Element 6601914 or 403201 ×2
  • Technic Axle 5.5 with Stop [Flat Short End] White Part 32209 Element 4120471 ×2
  • Technic Tread Hub White Part 32007 Element 4107487 ×2

Yellow 3 pieces

  • Technic Beam 3 x 5 L-Shape Thick Yellow Part 32526 Element 4144022 ×2
  • Technic Reel 3 x 2 Yellow Part 32012 Element 4297401 or 4120070 ×1

Trans-Neon Green 2 pieces

  • Technic Beam 1 x 9 Bent (7 - 3) Thick Trans-Neon Green Part 32271 Element 4144326 ×2

Trans-Neon Orange 2 pieces

  • Technic Beam 1 x 9 Bent (7 - 3) Thick Trans-Neon Orange Part 32271 Element 4144325 ×2

[No Color/Any Color] 1 piece

  • CD-Rom, Ultimate Builders Set (Set 3800) [No Color/Any Color] Part 4153273 ×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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