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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.

Checking

7713 Bridge Walker vs. White Lightning

632 pieces in 140 part and color combinations, plus 4 minifigures.

The official piece count includes the 25 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.

Every bag and the box. Shake out each bag, check its corners and seams, and look inside the empty box.
Inside what you have built. Small pieces lodge inside tubes, under plates and between studs. Turn the model over and look.
The last few steps. Compare each recent step with its parts callout. A piece used in the wrong place earlier leaves you one short later.
Look-alike colors. 4 parts in this set come in two colors that are easy to mix up; they are listed below.
The spare pieces. This set comes with 15 spare pieces, marked on each row of the checklist. One may be the piece you need.
The floor and your building area. Check under furniture, the chair and the edges of your building surface.

Look-alike colors in this set

These parts appear in this set in two colors that are easy to confuse. If you are one short in one color, check whether it went in where the other color belongs. Each color has its own element ID in the parts list at the back of the instructions.

Brick Round 1 x 1 Open Stud Red ×2 Trans-Red ×4 Trans-Red is see-through: hold the piece up to a light.
Hinge Cylinder 1 x 2 Locking with 2 Click Fingers and Axle Hole, 9 Teeth Black ×2 Dark Bluish Gray ×1 Black is darker than Dark Bluish Gray.
Plate 1 x 6 Black ×2 Dark Bluish Gray ×2 Black is darker than Dark Bluish Gray.
Technic Brick 1 x 2 [1 Pin Hole] Black ×4 Dark Bluish Gray ×9 Black is darker than Dark Bluish Gray.

Piece checklist

Technic Pins 127 pieces

Technic Pin Double with Axle Hole Black Part 32138 Element 4130597 or 4119589 ×8
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Black Part 32054 Element 4140801 or 4107742 ×16
Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Black Part 6558 Element 655826 1 spare in the box ×18
Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 7 spares in the box ×37
Technic Rotation Joint Ball Loop with Two Perpendicular Pins with Friction Black Part 47455 Element 4272426 or 4213374 ×6
Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×33
Technic Pin 1/2 without Friction Ridges Light Bluish Gray Part 4274 Element 4274194 or 4211483 1 spare in the box ×1
Technic Rotation Joint Ball Loop with Two Perpendicular Pins with Friction Red Part 47455 Element 4298041 or 4220519 ×8

Plates Special 43 pieces

Plate Special 1 x 2 Side Handle [Free Ends] Black Part 2540 Element 4140588 or 254026 ×2
Plate Special 1 x 2 [Side Handle Closed Ends] Black Part 48336 Element 4225201 ×2
Technic Plate 2 x 4 [3 Holes] Dark Bluish Gray Part 3709 Element 4227398 ×16
Bracket 1 x 2 - 2 x 2 Light Bluish Gray Part 44728 Element 6117967 or 6009014 ×15
Plate Special 2 x 2 with 1 Pin Hole [Split Underside Ribs] Light Bluish Gray Part 2444 Element 4211359 or 2444194 ×4
Plate Special 1 x 1 with Clip Horizontal [Thick U Clip] Red Part 6019 Element 601971 or 601921 ×2
Bracket 3 x 2 - 2 x 2 [aka Space Seat] Sand Blue Part 4598 Element 4265058 ×1
Plate Special 1 x 2 [Side Handle Closed Ends] White Part 48336 Element 6552125 or 4222017 ×1

Technic Bricks 40 pieces

Technic Brick 1 x 14 [13 Pin Holes] Black Part 32018 Element 4107558 ×9
Technic Brick 1 x 2 [1 Pin Hole] Black Part 3700 Element 370026 Also in Dark Bluish Gray ×4
Technic Brick 1 x 2 with Axle Hole Type 2 [X Opening] Black Part 32064b ×4
Technic Brick 1 x 8 [7 Pin Holes] Black Part 3702 Element 370226 ×6
Technic Brick 1 x 2 [1 Pin Hole] Dark Bluish Gray Part 3700 Element 4211111 Also in Black ×9
Technic Brick 1 x 2 [2 Pin Holes] Dark Bluish Gray Part 32000 Element 4210762 ×2
Technic Brick 1 x 6 [5 Pin Holes] Dark Bluish Gray Part 3894 Element 4210917 or 3894199 ×2
Technic Brick 1 x 4 [3 Pin Holes] Light Bluish Gray Part 3701 Element 4211441 ×2
Technic Brick 1 x 2 with Axle Hole Type 2 [X Opening] White Part 32064b ×2

Bricks Round and Cones 33 pieces

Brick Round 2 x 2 with Axle Hole Black Part 3941 Element 614376 or 614326 ×4
Brick Round 2 x 2 x 2 Robot Body, Axle Holder 'X' Orientation Black Part 30361b ×2
Brick Round 4 x 4 with 4 Side Pin Holes and Center Axle Hole Black Part 6222 Element 6533083 or 4290056 ×1
Cone 2 x 2 x 2, Open Stud Black Part 3942c Element 6092664 or 6022160 ×1
Cone 4 x 4 x 2, Axle Hole [Plain] Black Part 3943b Element 4143243 or 394326 ×6
Brick Round 2 x 2 Dome Top, Blocked Open Stud, Bottom Axle Holder Lime Part 30367b ×5
Brick Round 1 x 1 Open Stud Red Part 3062b Element 306221 Also in Trans-Red ×2
Brick Round 1 x 1 Open Stud Trans-Neon Green Part 3062b Element 6514237 or 6238675 ×8
Brick Round 1 x 1 Open Stud Trans-Red Part 3062b Element 6514235 or 6238673 Also in Red ×4

Plates Round Curved and Dishes 31 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 Trans-Neon Green Part 6141 Element 6240223 or 3005749 2 spares in the box ×30

Technic Special 27 pieces

Technic Brick Special 2 x 2 with Pin Hole, with 2 Rotation Joint Sockets Black Part 48172 Element 6296186 or 4275826 ×1
Technic Brick Special 2 x 2 with Pin Hole, Rotation Joint Ball Half [Horizontal Top] Dark Bluish Gray Part 48170 Element 6279898 or 4227395 ×4
Technic Brick Special 2 x 2 with Pin Hole, Rotation Joint Ball Half [Horizontal Top], Rotation Joint Socket Dark Bluish Gray Part 47452 Element 6021206 or 4636472 ×2
Technic Brick Special 2 x 2 with Pin Hole, Rotation Joint Ball Half [Vertical Side] Dark Bluish Gray Part 48171 Element 6492115 or 6343337 ×4
Technic Brick Special 2 x 2 with Pin Hole, Rotation Joint Socket Dark Bluish Gray Part 48169 Element 6278974 or 4225973 ×4
Technic Brick Special 2 x 3 with Pin Holes, Rotation Joint Ball Half [Horizontal Top], Rotation Joint Socket Dark Bluish Gray Part 47454 Element 4220507 ×2
Technic Brick Special 2 x 3 with Pin Holes, Rotation Joint Ball Half [Vertical Side], Rotation Joint Socket Dark Bluish Gray Part 47432 Element 4235573 ×2
Technic Tooth 1 x 3 with Axle Hole [Rounded Underside] Trans-Neon Green Part 41669 Element 4163577 ×6
Technic Tooth 1 x 3 with Axle Hole [Rounded Underside] Trans-Red Part 41669 Element 4163567 ×2

Bricks Sloped 24 pieces

Brick Sloped 2 x 2 No Studs, with 3 Side Pistons Raised Edges Black Part 30603 Element 4163524 ×5
Brick Sloped 45° 2 x 2 Black Part 3039 Element 303926 ×12
Brick Sloped Inverted 33° 3 x 2, Connections between Studs, Ovoid Bottom Pin Dark Bluish Gray Part 3747b Element 4211064 ×3
Brick Sloped 33° 3 x 1 White Part 4286 Element 6632142 or 428601 ×2
Brick Sloped Inverted 34° 3 x 1 with Internal Stopper White Part 4287b ×2

Technic Beams 18 pieces

Technic Beam 1 x 11.5 Double Bent Thick Black Part 32009 Element 6271152 or 4111998 ×4
Technic Beam 1 x 3 Thick Black Part 32523 Element 4142822 or 3252326 ×1
Technic Beam 1 x 3 Thin Black Part 6632 Element 6331723 or 4107828 ×4
Technic Beam 1 x 9 Bent (6 - 4) Thick Black Part 6629 Element 6279881 or 4119800 ×8
Technic Beam 2 x 4 L-Shape Thick Black Part 32140 Element 6271825 or 4120017 ×1

Technic Axles 17 pieces

Technic Axle 10 Black Part 3737 Element 373726 ×4
Technic Axle 4 Black Part 3705 Element 370526 ×2
Technic Axle 8 Black Part 3707 Element 370726 ×4
Technic Axle 3 with Stud Dark Bluish Gray Part 6587 Element 6587199 or 6129590 ×5
Technic Axle 3 Light Bluish Gray Part 4519 Element 4211815 ×2

Supports, Girders and Cranes 14 pieces

Support 1 x 1 x 5 1/3 Spiral Staircase Axle Black Part 40244 Element 4155558 ×14

Projectiles / Launchers 13 pieces

Launcher, Technic Competition Cannon, Round Bottom with Same Color Ends Black Part 32074c01 Element 4118816 or 4118815 ×1
Projectile, Technic Competition Arrow, Liftarm Shaft with Hollow Lime Rubber End (57028) Light Bluish Gray Part 57028c03 ×1
Projectile, Weapon Disc 2 x 2 with Marbled Yellow Pattern Lime Part 53993pat0001 Element 4494395 ×10
Launcher 2 x 3 x 4 2/3, Disc Trans-Brown Part 53990 Element 4292137 ×1

Bricks 12 pieces

Brick 1 x 2 Dark Bluish Gray Part 3004 Element 4211088 ×3
Brick 1 x 4 Dark Bluish Gray Part 3010 Element 4211103 ×2
Brick 2 x 2 Dark Bluish Gray Part 3003 Element 4211060 ×3
Brick 2 x 4 Dark Bluish Gray Part 3001 Element 4211085 ×2
Brick 1 x 2 Light Bluish Gray Part 3004 Element 4211388 ×2

Tiles Special 12 pieces

Tile Special 2 x 3 with 2 Clips [Angled Clips] Black Part 30350a Element 4194067 ×2
Tile Special 2 x 2 with Top Pin Light Bluish Gray Part 2460 Element 4211365 ×4
Tile Special 1 x 2 Grille with Bottom Groove Trans-Neon Green Part 2412b Element 4272661 or 4109766 ×6

Wheels and Tyres 12 pieces

Wheel 30.4 x 20 without Pinholes, with Reinforced Rim Black Part 56145 Element 4299389 or 4284946 ×4
Technic Wedge Belt Wheel [aka Pulley] Light Bluish Gray Part 4185 Element 6321743 or 4494222 ×4
Technic Wedge Belt Wheel [aka Pulley] Lime Part 4185 Element 6335116 or 4494219 ×4

Bars, Ladders and Fences 10 pieces

Antenna 8H Whip Black Part 2569 Element 6265148 or 6164379 ×3
Bar, 4 Top Bars, Palm Tree Top Black Part 2566 Element 4532220 or 4159103 ×2
Lever Small Base with Black Lever Black Part 298c02 Element 73587 2 spares in the box ×2
Bar 1L with Clip Dark Bluish Gray Part 48729a Element 4222196 ×2
Bar 4L (Lightsaber Blade / Wand) White Part 30374 Element 6116602 or 4129836 ×1

Bricks Curved 8 pieces

Brick Curved 2 x 2 with Lip, No Studs White Part 30602 Element 4195869 ×2
Brick Curved 3 x 1 No Studs White Part 50950 Element 6548268 or 4249112 ×6

Plates Wedged 7 pieces

Wedge Plate 3 x 6 Cut Corners Black Part 2419 Element 241926 ×2
Wedge Plate 4 x 4 Cut Corner Black Part 30503 Element 4160025 ×2
Wedge Plate 4 x 6 Cut Corners Black Part 32059 Element 4129572 ×3

Electronics 4 pieces

Cable, Fiber Optics, Wide 24L / 19.2cm Trans-Clear Part 40002c24 Element 4143325 ×2
Light Brick 2 x 4 [Red LED] Trans-Clear Part 54605 Element 4283931 ×2

Technic Connectors 4 pieces

Technic Axle and Pin Connector Angled #4 - 135° Dark Bluish Gray Part 32192 Element 6262899 or 4210688 ×2
Technic Axle 1.5 with Perpendicular Axle Connector (Technic Pole Reverser Handle) Light Bluish Gray Part 6553 Element 4211536 ×2

Tiles 4 pieces

Tile 2 x 2 with Groove Black Part 3068b Element 306826 ×1
Tile 1 x 1 with Groove Red Part 3070b Element 307021 1 spare in the box ×2
Tile 2 x 2 with Groove Red Part 3068b Element 306821 ×1

Transportation - Sea and Air 4 pieces

Technic Cylinder 4 x 4 with Pin Holes and Centre Bar, Closed Sides on Bar Black Part 41531 Element 6116995 or 4262615 ×4

Large Buildable Figures 3 pieces

Large Figure Foot, Toa Metru Black Part 47298 Element 4586836 or 4218517 ×1
Large Figure Foot, with 3 Holes, Visorak Black Part 50858 Element 4242035 ×2

Windscreens and Fuselage 3 pieces

Windscreen 5 x 2 x 1 2/3 Trans-Brown Part 6070 Element 4204624 ×3

Minifig Shields, Weapons, & Tools 2 pieces

Weapon Spear Gun with Rounded Trigger and Thin Spear Base Black Part 30088 Element 4287672 ×2

Technic Bushes 2 pieces

Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Light Bluish Gray Part 32123b Element 6271165 or 4211573 1 spare in the box ×2

Transportation - Land 2 pieces

Fairing 1 x 4 Side Flaring Intake with Two Pins White Part 30647 Element 4153705 ×2

Stickers 1 piece

Sticker Sheet for Set 7713-1 [No Color/Any Color] Part 56579 Element 4295421 ×1

Tubes and Hoses 1 piece

Hose, Ribbed 7mm D. 24L / 19.2cm Pearl Light Gray Part 78c24 Element 4495197 or 4275390 ×1

Minifigures 4 figures

Ha-Ya-To Minifigure, checked as a whole figure ×1
Devastator with Pearl Light Gray Torso Minifigure, checked as a whole figure ×2
Meca One 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.