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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.

MT-21 Mobile Mining Unit

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7648 MT-21 Mobile Mining Unit

123 pieces in 60 part and color combinations, plus 2 minifigures.

The official piece count includes the 7 parts inside the set's minifigures, which this inventory lists separately. 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

Plates 16 pieces

  • Plate 1 x 4 Black Part 3710 Element 371026 ×1
  • Plate 1 x 8 Black Part 3460 Element 346026 ×4
  • Plate 2 x 10 Black Part 3832 Element 383226 ×2
  • Plate 1 x 2 Blue Part 3023 Element 302323 ×4
  • Plate 2 x 6 Light Bluish Gray Part 3795 Element 4211452 or 3795194 ×1
  • Plate 1 x 3 White Part 3623 Element 6552105 or 6550144 ×2
  • Plate 2 x 4 White Part 3020 Element 6552098 or 302001 ×2

Plates Special 12 pieces

  • Plate Special 1 x 2 with Clips Horizontal [Thick U-Clips] Black Part 60470a Element 4537901 ×2
  • Plate Special 2 x 2 with Towball Black Part 3729 Element 4124111 or 4107856 ×1
  • Plate Special 1 x 1 with Clip Light, Bar Hole [Thick Ring] Light Bluish Gray Part 4081b Element 6281998 or 4632575 ×2
  • Plate Special 1 x 2 [Side Handle Closed Ends] Light Bluish Gray Part 48336 Element 4244627 ×1
  • Plate Special 2 x 2 with Towball Socket, Short, 4 Slots Light Bluish Gray Part 3730 Element 4272037 or 4211447 ×1
  • Plate Special 1 x 2 Side Handle [Free Ends] Orange Part 2540 Element 4190164 or 4163269 ×2
  • Plate Special 1 x 1 with Clip Vertical [Thick U Clip] White Part 4085c Element 408501 ×1
  • Plate Special 1 x 2 with Handle on End [Closed Ends] White Part 60478 Element 6552131 or 4515364 ×2

Bricks 11 pieces

  • Brick 1 x 4 without Bottom Tubes Trans-Brown Part 3066 Element 6514079 or 6245290 ×2
  • Brick 1 x 2 White Part 3004 Element 6548257 or 4613964 ×5
  • Brick 1 x 6 White Part 3009 Element 6552097 or 6548259 ×1
  • Brick 2 x 4 White Part 3001 Element 6552094 or 300101 ×3

Bricks Sloped 9 pieces

  • Brick Sloped 45° 2 x 1 with Bottom Pin White Part 3040b Element 6552115 or 4121932 ×2
  • Brick Sloped 45° 2 x 2 White Part 3039 Element 6552103 or 303901 ×2
  • Brick Sloped Inverted 45° 2 x 1 White Part 3665 Element 6552106 or 366501 ×2
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] White Part 3660 Element 366001 ×3

Hinges, Arms and Turntables 8 pieces

  • Hinge Brick 1 x 6 Locking with 1 Finger Vertical End and 2 Fingers Vertical End, 9 Teeth Black Part 30388 Element 4226509 or 3038826 ×2
  • Hinge Panel 2 x 4 x 3 1/3 Locking Dual 2 Fingers White Part 44572 Element 4610912 or 4519984 ×2
  • Hinge Plate 1 x 2 Locking with 2 Fingers on Side, 9 Teeth White Part 60471 Element 6615546 or 4515337 ×2
  • Hinge Plate 1 x 4 Locking Dual 1 Finger White Part 44568 Element 6276043 or 4193479 ×2

Plates Round Curved and Dishes 8 pieces

  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Light Bluish Gray Part 2654 Element 4278273 or 4276273 ×1
  • Plate Round 1 x 1 with Solid Stud Orange Part 6141 Element 4157103 1 spare in the box ×4
  • Plate Round 1 x 1 with Solid Stud Trans-Neon Green Part 6141 Element 6240223 or 3005749 1 spare in the box ×2
  • Dish 2 x 2 Inverted [Radar] White Part 4740 Element 6601845 or 474001 ×1

Wheels and Tyres 8 pieces

  • Wheel Hard Plastic Small (22mm D. x 24mm) Orange Part 6118 Element 4505861 ×8

Bricks Round and Cones 6 pieces

  • Brick Round 2 x 2 with Axle Hole Black Part 3941 Element 614376 or 614326 ×2
  • Cone 1 x 1 [No Top Groove] Black Part 4589 Element 4518219 or 458926 ×2
  • Brick Round 1 x 1 with Fins, Open Stud Dark Bluish Gray Part 4588 Element 6331222 or 6321195 ×1
  • Cone 1 x 1 [No Top Groove] Trans-Dark Blue Part 4589 Element 618843 ×1

Bars, Ladders and Fences 5 pieces

  • Bar 1L with Clip Black Part 48729a Element 4272218 1 spare in the box ×3
  • Bar, 4 Top Bars, Palm Tree Top Black Part 2566 Element 4532220 or 4159103 ×1
  • Antenna 1 x 4 with Rounded Top White Part 3957a ×1

Bricks Special 5 pieces

  • Brick Special 2 x 4 with Pins Light Bluish Gray Part 6249 Element 6356158 or 4211676 ×3
  • Brick Special 1 x 2 with Vertical Clip [Thick U Clip] White Part 30237a ×2

Technic Bricks 5 pieces

  • Technic Brick 1 x 4 [3 Pin Holes] White Part 3701 Element 6601913 or 370101 ×5

Technic Pins 4 pieces

  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 1 spare in the box ×2
  • Technic Pin without Friction Ridges Lengthwise Light Bluish Gray Part 3673 Element 4211807 or 3673194 1 spare in the box ×2

Bricks Curved 3 pieces

  • Brick Curved 3 x 1 No Studs White Part 50950 Element 6548268 or 4249112 ×3

Rock 3 pieces

  • Rock 1 x 1 Jewel / Gem 24 Facet Trans-Neon Green Part 30153 Element 6247790 or 4114505 ×3

Tiles Special 3 pieces

  • Tile Special 1 x 2 Grille with Bottom Groove Orange Part 2412b Element 4125254 or 3933106 ×3

Flags, Banners and Signs 2 pieces

  • Road Sign Clip-on 2 x 2 Round White Part 30261 Element 6317571 or 4116816 ×2

Minifig Accessories 2 pieces

  • Equipment Goblet / Glass Black Part 2343 Element 6247194 or 4223189 ×1
  • Equipment Radio [Extended Handle, Compact Speaker Grille] Black Part 3962b Element 396226 ×1

Minifig Upper Body 2 pieces

  • Arm Mechanical Straight (Droid) [2 Clips at 90°] Black Part 59230 Element 4505757 1 spare in the box ×2

Technic Beams 2 pieces

  • Technic Beam 1 x 5 Thick White Part 32316 Element 4249021 or 4140465 ×2

Tiles 2 pieces

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

Large Buildable Figures 1 piece

  • Large Figure Weapon Spear, Drill with Axle and Hole Black Part 40340 Element 4507190 or 4227078 ×1

Minifig Shields, Weapons, & Tools 1 piece

  • Tool Circular Saw Dark Bluish Gray Part 30194 Element 4211080 ×1

Pneumatics 1 piece

  • Pneumatic T-Piece (T Bar) [New Style] Light Bluish Gray Part 4697b Element 4211508 1 spare in the box ×1

Stickers 1 piece

  • Sticker Sheet for Set 7648-1 [No Color/Any Color] Part 62069 Element 4520966 ×1

Technic Axles 1 piece

  • Technic Axle 2 Notched Red Part 32062 Element 4142865 ×1

Technic Connectors 1 piece

  • Technic Axle and Pin Connector Perpendicular Double Split Black Part 41678 Element 4162857 ×1

Windscreens and Fuselage 1 piece

  • Windscreen 5 x 4 x 3 Trans-Orange Part 30251 Element 4519985 ×1

Minifigures 2 figures

  • Martian Minifigure, checked as a whole figure ×1
  • Mars Astronaut, Orange Sunglasses, Stubble 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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