BlockTalk Find Your Set

Free tool

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.

Mindstorms Education NXT Base Set

Checking

9797 Mindstorms Education NXT Base Set

442 pieces in 99 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.

Show

Piece checklist

Black 133 pieces

  • Cable, Connector, 20cm for NXT Black Part 55804 Element 6089561 or 4297187 ×1
  • Cable, Connector, 35cm for NXT Black Part 55805 Element 6178439 or 6089560 ×4
  • Cable, Connector, 50cm for NXT Black Part 55806 Element 6178448 or 6089559 ×2
  • Cable, Converter, 35cm for NXT Black Part 54690 Element 6124624 or 4494063 ×3
  • Cable, USB, 2m for NXT Black Part 57482 Element 4532371 ×1
  • Electric Adapter / Transformer, 120V - 10V AC Black Part 45541 ×1
  • Hair Ponytail Black Part 6093 Element 609376 or 609326 ×1
  • 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 ×6
  • Technic Axle 6 Black Part 3706 Element 370626 ×4
  • Technic Axle 8 Black Part 3707 Element 370726 ×2
  • Technic Axle Connector Smooth [with x Hole + Orientation] Black Part 59443 Element 6084612 or 4512363 ×4
  • Technic Axle and Pin Connector Angled #2 - 180° Black Part 32034 Element 6271869 or 4107783 ×2
  • Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole Black Part 32184 Element 6276951 or 4121667 ×8
  • Technic Gear 12 Tooth Double Bevel Black Part 32270 Element 4177431 ×4
  • Technic Gear 36 Tooth Double Bevel Black Part 32498 Element 4255563 or 4177434 ×2
  • Technic Knob Wheel Black Part 32072 Element 6284188 or 4248204 ×4
  • Technic Pin Double with Axle Hole Black Part 32138 Element 4130597 or 4119589 ×2
  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Black Part 32054 Element 4140801 or 4107742 ×8
  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 ×60
  • Technic Wedge Belt Wheel Tire Black Part 2815 Element 6028041 or 281526 ×4
  • Tyre 24 x 14 Shallow Tread (Tread Small Hub) Black Part 30648 Element 4524358 or 4153005 ×2
  • Tyre 56 x 26 Balloon Black Part 55976 Element 6495636 or 4297209 ×4

Light Bluish Gray 128 pieces

  • Brick 1 x 2 Light Bluish Gray Part 3004 Element 4211388 ×8
  • Brick 2 x 2 Light Bluish Gray Part 3003 Element 4211387 ×4
  • Plate 1 x 2 Light Bluish Gray Part 3023 Element 4211398 or 3023194 ×4
  • Plate 1 x 4 Light Bluish Gray Part 3710 Element 4211445 ×4
  • Technic Axle 3 Light Bluish Gray Part 4519 Element 4211815 ×14
  • Technic Axle 5 Light Bluish Gray Part 32073 Element 32073194 or 4211639 ×8
  • Technic Axle and Pin Connector Perpendicular Light Bluish Gray Part 6536 Element 6261375 or 4211775 ×20
  • Technic Beam 3 x 0.5 Liftarm with Boss and Pin / Crank Light Bluish Gray Part 33299a Element 4211688 ×2
  • Technic Brick 1 x 16 [15 Pin Holes] Light Bluish Gray Part 3703 Element 4211443 ×4
  • Technic Brick 1 x 2 [1 Pin Hole] Light Bluish Gray Part 3700 Element 4211440 ×4
  • Technic Brick 1 x 4 [3 Pin Holes] Light Bluish Gray Part 3701 Element 4211441 ×4
  • Technic Brick 1 x 6 [5 Pin Holes] Light Bluish Gray Part 3894 Element 4211466 ×4
  • Technic Brick 1 x 8 [7 Pin Holes] Light Bluish Gray Part 3702 Element 4211442 ×4
  • Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 ×10
  • Technic Gear 16 Tooth with Round Holes [Old Style] Light Bluish Gray Part 4019 Element 4562487 or 4211563 ×4
  • Technic Gear 24 Tooth Crown with Reinforcements [New Style] Light Bluish Gray Part 3650c Element 4211434 ×2
  • Technic Gear 40 Tooth Light Bluish Gray Part 3649 Element 6195314 or 4285634 ×2
  • Technic Pin Connector Hub Perpendicular 3 x 3 Bent with 4 Pins (Pin Ridges Across Part) Light Bluish Gray Part 55615 Element 4296059 ×6
  • Technic Pin Connector Hub Perpendicular 3L with 4 Pins Light Bluish Gray Part 48989 Element 4225033 ×2
  • Technic Plate 2 x 4 [3 Holes] Light Bluish Gray Part 3709 Element 4211444 ×2
  • Technic Plate 2 x 6 [5 Holes] Light Bluish Gray Part 32001 Element 4211542 ×2
  • Technic Plate 2 x 8 [7 Holes] Light Bluish Gray Part 3738 Element 4211449 ×2
  • Technic Wedge Belt Wheel [aka Pulley] Light Bluish Gray Part 4185 Element 6321743 or 4494222 ×4
  • Technic Worm Gear Light Bluish Gray Part 4716 Element 4211510 ×2
  • Wheel 18 x 14 with Pin Hole, Fake Bolts and Shallow Spokes Light Bluish Gray Part 55981 Element 6109684 or 4299119 ×2
  • Wheel 30.4 x 20 without Pinholes, with Reinforced Rim Light Bluish Gray Part 56145 Element 4297210 ×4

Dark Bluish Gray 77 pieces

  • Technic Axle 5.5 with Stop [Rounded Short End] Dark Bluish Gray Part 59426 Element 4508553 ×2
  • Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Dark Bluish Gray Part 42003 Element 6273715 or 4210857 ×4
  • Technic Axle and Pin Connector Perpendicular Double Dark Bluish Gray Part 32291 Element 6280395 or 4210655 ×2
  • Technic Beam 1 x 11 Thick Dark Bluish Gray Part 32525 Element 4603472 or 4534914 ×2
  • Technic Beam 1 x 11.5 Double Bent Thick Dark Bluish Gray Part 32009 Element 6271155 or 4210668 ×4
  • Technic Beam 1 x 13 Thick Dark Bluish Gray Part 41239 Element 4522937 or 4261932 ×2
  • Technic Beam 1 x 15 Thick Dark Bluish Gray Part 32278 Element 32278199 or 4542576 ×4
  • Technic Beam 1 x 3 Thick Dark Bluish Gray Part 32523 Element 32523199 or 4210751 ×10
  • Technic Beam 1 x 5 Thick Dark Bluish Gray Part 32316 Element 32316199 or 4210686 ×4
  • Technic Beam 1 x 7 Thick Dark Bluish Gray Part 32524 Element 4495931 or 4210752 ×4
  • Technic Beam 1 x 9 Bent (6 - 4) Thick Dark Bluish Gray Part 6629 Element 6279883 or 4210638 ×4
  • Technic Beam 1 x 9 Thick Dark Bluish Gray Part 40490 Element 4645730 or 4210757 ×6
  • Technic Beam 2 x 4 L-Shape Thick Dark Bluish Gray Part 32140 Element 6271830 or 4210667 ×4
  • Technic Beam 3 x 5 L-Shape Thick Dark Bluish Gray Part 32526 Element 4210753 ×8
  • Technic Beam 3 x 5 L-Shape with Quarter Ellipse Thin Dark Bluish Gray Part 32250 Element 32250199 or 6327165 ×4
  • Technic Brick 1 x 2 with Axle Hole Type 2 [X Opening] Dark Bluish Gray Part 32064b ×2
  • Technic Gear 24 Tooth [New Style with Single Axle Hole] Dark Bluish Gray Part 3648b Element 6133119 or 4514558 ×4
  • Technic Gear 8 Tooth Dark Bluish Gray Part 3647 Element 4514559 ×4
  • Technic Turntable Large Type 2, 24/56 Tooth with Black Outside Gear Section [Complete Assembly] Dark Bluish Gray Part 50163 Element 4520872 or 4235858 ×1
  • Tile 1 x 2 with Groove Dark Bluish Gray Part 3069b Element 4211052 ×2

Blue 47 pieces

  • Ball, Hard Plastic, 51mm (approx. 6 studs diameter) Blue Part 41250 Element 4100758 ×1
  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×10
  • Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Blue Part 6558 Element 4514553 ×36

Yellow 13 pieces

  • Minifig Head Standard Grin Print [Blocked Open Stud] Yellow Part 3626bpr0001 Element 6020398 ×1
  • Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Yellow Part 32123b Element 6271167 or 3212324 2 spares in the box ×10
  • Technic Rubber Belt Large [33mm ID] [Round Cross Section] Yellow Part 85546 Element 4544151 or 70905 ×2

Red 12 pieces

  • Ball, Hard Plastic, 51mm (approx. 6 studs diameter) Red Part 41250 Element 4156530 ×1
  • Hat / Cap Long Peak [Plain] Red Part 4485 Element 448521 ×1
  • Technic Axle 2 Notched Red Part 32062 Element 4142865 ×8
  • Technic Rubber Belt Medium [24mm ID] [Round Cross Section] Red Part 85544 Element 4544145 or 4544143 ×2

Very Light Bluish Gray 12 pieces

  • Battery Pack, Rechargeable, 7.4V NXT [DC plug] Very Light Bluish Gray Part 87662 Element 4565588 ×1
  • Hub, NXT Brick with Dark Bluish Gray Base [Complete Assembly] Very Light Bluish Gray Part 53788 Element 6034375 or 6006064 ×1
  • Motor, NXT Very Light Bluish Gray Part 53787 Element 6122000 or 4297008 ×3
  • Sensor, Light, NXT Very Light Bluish Gray Part 55969 Element 6036227 or 4296917 ×1
  • Sensor, Sound, NXT Very Light Bluish Gray Part 55963 Element 6115463 or 4629679 ×1
  • Sensor, Touch, NXT Very Light Bluish Gray Part 53793 Element 4296929 ×2
  • Sensor, Ultrasonic, NXT Very Light Bluish Gray Part 53792 Element 6115469 or 4297174 ×1
  • Storage / Sorting Tray, Dacta [For New Style Storage Bins] Very Light Bluish Gray Part 54358 ×1
  • Storage Bin, Dacta, Medium [New Style] Very Light Bluish Gray Part 54187 ×1

Tan 10 pieces

  • Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×8
  • Technic Gear 20 Tooth Double Bevel with Axle Hole Type 2 [X Opening] Tan Part 32269 Element 4514555 ×2

White 4 pieces

  • Light Brick 1 x 2 with Single Side Light White Part 6035 Element 4603220 or 74880 ×3
  • Torso, Sailboat with Sunset Print, Yellow Arms and Hands White Part 973c01h01pr1204 Element 4275606 ×1

Orange 2 pieces

  • Hips and Orange Legs Orange Part 970c34 Element 6329305 or 4602964 ×1
  • Storage / Sorting Tray, Dacta, 13 Cups [For New Style Storage Bins] Orange Part 54572 ×1

Trans-Clear 1 piece

  • Storage Bin Lid, Dacta [For New Style Trays] Trans-Clear Part 54190 ×1

Trans-Green 1 piece

  • Brick 1 x 2 without Bottom Tube Trans-Green Part 3065 Element 6514266 or 6244908 ×1

Trans-Red 1 piece

  • Brick 1 x 2 without Bottom Tube Trans-Red Part 3065 Element 6514263 or 6244905 ×1

Trans-Yellow 1 piece

  • Brick 1 x 2 without Bottom Tube Trans-Yellow Part 3065 Element 6514265 or 6244907 ×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.

We value your privacy

We use cookies 🍪 for analytics and to improve your experience. Read our privacy policy