# LEGO 8421-1 — Mobile Crane (2005)

Source: https://www.brickmissing.com/sets/8421-1-mobile-crane
Publisher: BrickMissing (https://www.brickmissing.com) — free LEGO parts checker. Not affiliated with the LEGO Group.

Command the most impressive machine on any LEGO construction site with the Technic Mobile Crane (8421-1). This authentic 2005 model features a fully functional pneumatic system that uses cylinders and an air pump to precisely raise and lower its massive boom. Power is delivered by an included motor and battery box, allowing the boom to extend telescopically to over 64 cm and lower the hook. Navigate the site with realistic six-wheel steering, where the wheels drive the pistons of the integrated V6 engine, a detail hobbyists will appreciate. Four retractable outriggers stabilize the impressive structure, which measures over 46 cm long, and the boom rotates a full 360 degrees for comprehensive coverage. Additionally, builders can transform this complex vehicle into an Aerial Lift using alternate instructions.

## Set facts

- Set number: 8421-1
- Name: Mobile Crane
- Theme: Technic
- Released: 2005
- Pieces: 1885
- Distinct part + colour lots: 201
- Build difficulty: intermediate
- Repairability: 2.5% of this set's lots are hard to replace (5 of 201 part+colour combinations appear in three or fewer sets in the entire LEGO catalog).

## Complete parts list (201 lots, 1885 pieces)

Prices are the official LEGO Pick a Brick price per individual part, where LEGO publishes one.

| Qty | Part | Colour | Part no. | LEGO element ID | LEGO price each |
| ---: | --- | --- | --- | --- | --- |
| 2 | String with End Studs 31L Overall | Black | 14226c31 | 6096956 | €3,00 |
| 1 | String Cord Medium Thickness 250cm | Black | 14728c250 | 6043668 | — |
| 2 | Plate 2 x 2 Corner | Yellow | 2420 | 242024 | €0,07 |
| 2 | Tile 1 x 4 with Groove | Yellow | 2431 | 243124 | €0,12 |
| 1 | Tile 1 x 4 with Groove | Black | 2431 | 243126 | €0,12 |
| 2 | Plate Special 2 x 2 with 1 Pin Hole [Split Underside Ribs] | Black | 2444 | 244426 | — |
| 4 | Brick 2 x 6 | Yellow | 2456 | 4181143 | €0,29 |
| 3 | Plate Round 2 x 2 with Rounded Bottom [Boat Stud] | Black | 2654 | 4278359 | €0,07 |
| 6 | Technic Slope Long 1 x 6 with 3 Pin Holes | Yellow | 2744 | 274424 | — |
| 234 | Technic Pin with Friction Ridges Lengthwise and Center Slots | Black | 2780 | 278026 | — |
| 1 | Pneumatic Pump New Style with Black Top | Yellow | 2797c02 | 4563134 | — |
| 1 | Plate Special 2 x 2 with 2 Pin Holes | Yellow | 2817 | 281724 | — |
| 1 | Technic Steering Wheel Small (3 Studs Diameter) | Light Bluish Gray | 2819 | 4580510 | €0,34 |
| 1 | Battery Box, 9V 4 x 14 x 4 with Dark Bluish Gray Base [Complete Assembly] | Yellow | 2847c03 | — | — |
| 6 | Technic Engine Cylinder with Side Slots | Dark Bluish Gray | 2850a | 32061199 | — |
| 6 | Technic Engine Piston Round | Yellow | 2851 | 4112203 | €0,18 |
| 6 | Technic Engine Connecting Rod | Light Bluish Gray | 2852 | 6000018 | €0,11 |
| 2 | Technic Engine Crankshaft | Light Bluish Gray | 2853 | 4211609 | €0,16 |
| 2 | Technic Engine Crankshaft Center | Dark Bluish Gray | 2854 | 2854199 | — |
| 14 | Technic Beam Triangle Thin [Type I] | Black | 2905 | 290526 | — |
| 2 | Wheel Spoked 2 x 2 with Pin Hole | Black | 30155 | 4156948 | — |
| 1 | Plate 2 x 3 | Yellow | 3021 | 302124 | €0,13 |
| 3 | Plate 2 x 2 | Yellow | 3022 | 302224 | €0,10 |
| 2 | Plate 1 x 2 | Dark Bluish Gray | 3023 | 4211063 | €0,08 |
| 13 | Plate 1 x 2 | Yellow | 3023 | 302324 | €0,08 |
| 1 | Plate 4 x 6 | Dark Bluish Gray | 3032 | 4211115 | €0,41 |
| 1 | Plate 2 x 8 | Yellow | 3034 | 303424 | €0,29 |
| 1 | Plate 4 x 8 | Dark Bluish Gray | 3035 | 4211061 | €0,46 |
| 2 | Grille 1 x 4 [Two Pins] | Yellow | 30622 | 4153120 | — |
| 4 | Tile 1 x 2 with Groove | Yellow | 3069b | 306924 | €0,07 |
| 12 | Technic Pin 3/4 | Dark Bluish Gray | 32002 | 32002199 | — |
| 8 | Technic Beam 1 x 11.5 Double Bent Thick | Dark Bluish Gray | 32009 | 6271155 | €0,39 |
| 1 | Technic Beam 1 x 11.5 Double Bent Thick | Yellow | 32009 | 6271150 | €0,39 |
| 2 | Technic Beam 1 x 11.5 Double Bent Thick | Black | 32009 | 6271152 | €0,39 |
| 8 | Technic Axle and Pin Connector Angled #1 | Light Bluish Gray | 32013 | 6296859 | €0,08 |
| 1 | Technic Axle and Pin Connector Angled #1 | Black | 32013 | 6284699 | €0,08 |
| 12 | Technic Axle and Pin Connector Angled #1 | Yellow | 32013 | 6329889 | €0,08 |
| 2 | Technic Axle and Pin Connector Angled #5 - 112.5° | Black | 32015 | 6271346 | €0,21 |
| 2 | Technic Axle and Pin Connector Angled #3 - 157.5? | Black | 32016 | 6261386 | €0,13 |
| 2 | Technic Beam 1 x 5 Thin | Light Bluish Gray | 32017 | 4503416 | €0,15 |
| 2 | Technic Brick 1 x 14 [13 Pin Holes] | Black | 32018 | 4107558 | €0,56 |
| 5 | Technic Brick 1 x 14 [13 Pin Holes] | Yellow | 32018 | 3201824 | — |
| 8 | Tyre 62.4 x 20 | Black | 32019 | 6411639 | €4,21 |
| 8 | Wheel 43.2 x 18 with Extended Axle Stem | Light Bluish Gray | 32020 | 4179382 | — |
| 2 | Technic Axle and Pin Connector Angled #2 - 180° | Light Bluish Gray | 32034 | 6346487 | €0,11 |
| 5 | Technic Axle and Pin Connector Angled #2 - 180° | Black | 32034 | 6271869 | €0,11 |
| 2 | Technic Axle Connector with Axle Hole | Black | 32039 | 3203926 | — |
| 6 | Technic Axle Connector with Axle Hole | Yellow | 32039 | 3203924 | — |
| 29 | Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] | Yellow | 32054 | 3205424 | — |
| 4 | Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] | Black | 32054 | 3205426 | — |
| 17 | Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] | Light Bluish Gray | 32054 | 4211865 | — |
| 14 | Technic Beam 3 x 3 L-Shape Thin | Black | 32056 | 3205623 | — |
| 24 | Technic Axle 2 Notched | Red | 32062 | 4142865 | €0,07 |
| 2 | Technic Brick 1 x 2 with Axle Hole Type 2 [X Opening] | Yellow | 32064b | — | — |
| 1 | Technic Beam 1 x 7 Thin | Black | 32065 | 6271573 | €0,28 |
| 1 | Technic Beam 1 x 7 Thin | Yellow | 32065 | 4114672 | — |
| 4 | Technic Knob Wheel | Yellow | 32072 | 6284189 | €0,27 |
| 40 | Technic Axle 5 | Light Bluish Gray | 32073 | 4211639 | €0,11 |
| 4 | Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced | Yellow | 32123b | 6271167 | €0,04 |
| 30 | Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced | Light Bluish Gray | 32123b | 6271165 | €0,04 |
| 4 | Technic Plate 1 x 5 with Smooth Ends, 4 Studs and Centre Axle Hole | Black | 32124 | 6280168 | €0,11 |
| 1 | Technic Pin Double with Axle Hole | Black | 32138 | 4119589 | — |
| 3 | Technic Pin Double with Axle Hole | Light Bluish Gray | 32138 | 4211888 | — |
| 32 | Technic Beam 2 x 4 L-Shape Thick | Dark Bluish Gray | 32140 | 6271830 | €0,15 |
| 6 | Technic Beam 2 x 4 L-Shape Thick | Yellow | 32140 | 6271828 | €0,15 |
| 2 | Technic Beam 2 x 4 L-Shape Thick | Black | 32140 | 6271825 | €0,15 |
| 3 | Technic Beam 2 x 4 L-Shape Thick | Black | 32140 | 6271829 | €0,15 |
| 28 | Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole | Black | 32184 | 6276951 | €0,12 |
| 7 | Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole | Light Bluish Gray | 32184 | 6276969 | €0,12 |
| 1 | Technic Gear 20 Tooth Bevel | Light Bluish Gray | 32198 | 6359714 | €0,56 |
| 15 | Technic Axle 5.5 with Stop [Flat Short End] | Dark Bluish Gray | 32209 | 4263624 | — |
| 6 | Technic Beam 3 x 5 L-Shape with Quarter Ellipse Thin | Black | 32250 | 6327162 | €0,42 |
| 4 | Technic Beam 5 x 7 L-Shape with Quarter Ellipse Thin | Black | 32251 | 3225126 | — |
| 5 | Technic Gear 20 Tooth Double Bevel with Axle Hole Type 2 [X Opening] | Light Bluish Gray | 32269 | 32269194 | — |
| 5 | Technic Gear 12 Tooth Double Bevel | Light Bluish Gray | 32270 | 32270194 | — |
| 3 | Technic Beam 1 x 9 Bent (7 - 3) Thick | Yellow | 32271 | 6276838 | €0,33 |
| 8 | Technic Beam 1 x 15 Thick | Yellow | 32278 | 4542579 | €0,42 |
| 6 | Technic Beam 1 x 15 Thick | Black | 32278 | 4542573 | €0,42 |
| 19 | Technic Beam 1 x 15 Thick | Light Bluish Gray | 32278 | 4542577 | €0,42 |
| 2 | Technic Axle and Pin Connector Perpendicular Double | Black | 32291 | 6280394 | €0,15 |
| 18 | Technic Beam 1 x 5 Thick | Yellow | 32316 | 4142133 | €0,19 |
| 24 | Technic Beam 1 x 5 Thick | Light Bluish Gray | 32316 | 4211651 | €0,19 |
| 1 | Technic Beam 1 x 5 Thick | Black | 32316 | 4142135 | €0,19 |
| 2 | Technic Pin Connector Block 1 x 5 x 3 | Light Bluish Gray | 32333 | 6271360 | €0,44 |
| 2 | Technic Beam 1 x 7 Bent (4 - 4) Thick | Light Bluish Gray | 32348 | 6278129 | €0,27 |
| 4 | Technic Beam 1 x 4 Thin | Yellow | 32449 | 6327559 | €0,19 |
| 17 | Technic Beam 1 x 4 Thin | Light Bluish Gray | 32449 | 6370947 | €0,19 |
| 1 | Technic Gear 36 Tooth Double Bevel | Black | 32498 | 4255563 | €0,90 |
| 2 | Technic Beam 1 x 3 Thick | Light Bluish Gray | 32523 | 4211655 | €0,10 |
| 12 | Technic Beam 1 x 3 Thick | Dark Bluish Gray | 32523 | 4210751 | €0,10 |
| 7 | Technic Beam 1 x 3 Thick | Yellow | 32523 | 4153707 | €0,10 |
| 29 | Technic Beam 1 x 7 Thick | Light Bluish Gray | 32524 | 4495930 | €0,25 |
| 10 | Technic Beam 1 x 7 Thick | Yellow | 32524 | 4495934 | €0,25 |
| 6 | Technic Beam 1 x 11 Thick | Light Bluish Gray | 32525 | 4611705 | €0,33 |
| 3 | Technic Beam 1 x 11 Thick | Yellow | 32525 | 6028107 | €0,33 |
| 11 | Technic Beam 3 x 5 L-Shape Thick | Light Bluish Gray | 32526 | 4211713 | €0,24 |
| 6 | Technic Beam 3 x 5 L-Shape Thick | Black | 32526 | 4158923 | €0,24 |
| 4 | Technic Beam 3 x 5 L-Shape Thick | Yellow | 32526 | 4144022 | €0,24 |
| 8 | Technic Beam 3 x 5 L-Shape Thick | Black | 32526 | 4142823 | €0,24 |
| 2 | Technic Pin Connector Plate with One Hole (Single on Bottom) | Black | 32529 | 4144023 | — |
| 13 | Technic Pin Long without Friction Ridges - Single Slot | Light Bluish Gray | 32556a | 4211709 | — |
| 4 | Technic Beam 3 x 0.5 Liftarm with Boss and Pin / Crank | Black | 33299a | 4156980 | — |
| 6 | Plate 1 x 8 | Yellow | 3460 | 346024 | €0,18 |
| 8 | Plate 1 x 8 | Dark Bluish Gray | 3460 | 4210998 | €0,18 |
| 6 | Plate 1 x 3 | Yellow | 3623 | 362324 | €0,07 |
| 2 | Plate 1 x 3 | Dark Bluish Gray | 3623 | 4211133 | €0,07 |
| 11 | Technic Gear 8 Tooth | Light Bluish Gray | 3647 | 3647194 | — |
| 1 | Technic Gear 24 Tooth [New Style with Single Axle Hole] | Light Bluish Gray | 3648b | 4211565 | — |
| 1 | Technic Gear 24 Tooth Crown with Reinforcements [New Style] | Light Bluish Gray | 3650c | 4211434 | — |
| 4 | Slope Inverted 45° 2 x 1 | Dark Bluish Gray | 3665 | 4211096 | €0,11 |
| 1 | Plate 1 x 6 | Light Bluish Gray | 3666 | 4211438 | €0,17 |
| 1 | Plate 1 x 6 | Black | 3666 | 366626 | €0,17 |
| 10 | Plate 1 x 6 | Yellow | 3666 | 366624 | €0,17 |
| 4 | Technic Brick 1 x 4 [3 Pin Holes] | Yellow | 3701 | 370124 | €0,17 |
| 4 | Technic Brick 1 x 8 [7 Pin Holes] | Yellow | 3702 | 370224 | €0,36 |
| 16 | Technic Brick 1 x 16 [15 Pin Holes] | Yellow | 3703 | 370324 | — |
| 2 | Technic Brick 1 x 16 [15 Pin Holes] | Dark Bluish Gray | 3703 | 4256828 | €0,82 |
| 34 | Technic Axle 4 | Black | 3705 | 370526 | €0,08 |
| 5 | Technic Axle 6 | Black | 3706 | 370626 | €0,12 |
| 7 | Technic Axle 8 | Black | 3707 | 370726 | €0,22 |
| 2 | Technic Axle 12 | Black | 3708 | 370826 | €0,27 |
| 16 | Plate 1 x 4 | Yellow | 3710 | 371024 | €0,12 |
| 52 | Technic Bush | Light Bluish Gray | 3713 | 6275844 | €0,05 |
| 17 | Technic Bush | Black | 3713 | 6332148 | €0,05 |
| 5 | Technic Axle 10 | Black | 3737 | 373726 | €0,25 |
| 9 | Technic Gear Rack 1 x 4 | Light Bluish Gray | 3743 | 6457283 | €0,19 |
| 2 | Technic Axle Pin without Friction Ridges Lengthwise | Tan | 3749 | 4666579 | €0,06 |
| 6 | Plate Special 1 x 2 with 1 Stud without Groove (Jumper) | Pearl Light Gray | 3794a | 4133560 | — |
| 2 | Plate Special 1 x 2 with 1 Stud without Groove (Jumper) | Warm Yellowish Orange | 3794a | 4243882 | — |
| 4 | Technic Brick 1 x 6 [5 Pin Holes] | Yellow | 3894 | 389424 | €0,29 |
| 3 | Brick Round 2 x 2 with Axle Hole | Trans-Neon Orange | 3941 | 611647 | — |
| 8 | Technic Gear 16 Tooth with Round Holes [Old Style] | Light Bluish Gray | 4019 | 4019194 | — |
| 3 | Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) | Black | 4032a | 403226 | €0,06 |
| 11 | Technic Beam 1 x 9 Thick | Dark Bluish Gray | 40490 | 4645730 | €0,29 |
| 4 | Technic Beam 1 x 9 Thick | Yellow | 40490 | 6115616 | €0,29 |
| 1 | Technic Beam 1 x 9 Thick | Light Bluish Gray | 40490 | 6102449 | €0,29 |
| 2 | Technic Beam 1 x 9 Thick | Black | 40490 | 4645732 | €0,29 |
| 14 | Technic Beam 1 x 13 Thick | Black | 41239 | 4522933 | €0,39 |
| 2 | Technic Beam 1 x 13 Thick | Light Bluish Gray | 41239 | 4522934 | €0,39 |
| 7 | Technic Beam 1 x 13 Thick | Yellow | 41239 | 4522935 | €0,39 |
| 14 | Tile 1 x 8 with Groove | Yellow | 4162 | 4189400 | €0,15 |
| 2 | Large Figure Skeletal, Limb 1 x 3 x 7 Beam with Axle Holes (Bohrok) | Black | 41672 | 4163139 | — |
| 6 | Technic Beam 1 x 2 Thin | Dark Bluish Gray | 41677 | 6338422 | €0,13 |
| 2 | Technic Beam 1 x 2 Thin | Black | 41677 | 6338428 | €0,13 |
| 12 | Technic Beam 1 x 2 Thin | Red | 41677 | 6371442 | €0,13 |
| 4 | Technic Beam 1 x 2 Thin | Light Bluish Gray | 41677 | 6348143 | €0,13 |
| 2 | Technic Axle and Pin Connector Perpendicular Double Split | Yellow | 41678 | 4187125 | — |
| 4 | Wedge 4 x 2 Right | Yellow | 41767 | 4160333 | — |
| 4 | Wedge 4 x 2 Left | Yellow | 41768 | 4160348 | — |
| 3 | Technic Wedge Belt Wheel [aka Pulley] | Light Bluish Gray | 4185 | 6321743 | €0,30 |
| 2 | Technic Wedge Belt Wheel [aka Pulley] | Black | 4185 | 6323668 | €0,30 |
| 19 | Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes | Light Bluish Gray | 42003 | 6273724 | €0,12 |
| 3 | Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes | Yellow | 42003 | 6273711 | €0,12 |
| 20 | Technic Pin 1/2 | Light Bluish Gray | 4274 | 4211483 | €0,05 |
| 1 | Motor, RC Race Buggy | Black | 42908 | 4177239 | — |
| 106 | Technic Axle Pin with Friction Ridges Lengthwise | Black | 43093 | 4206482 | €0,06 |
| 2 | Technic Beam 1 x 2 Thick | Yellow | 43857 | 4187122 | €0,12 |
| 1 | Technic Beam 1 x 2 Thick | Light Bluish Gray | 43857 | 4211862 | €0,12 |
| 2 | Technic Beam 1 x 2 Thick | Black | 43857 | 6057802 | €0,12 |
| 2 | Technic Beam 1 x 2 Thick | Black | 43857 | 4177444 | €0,12 |
| 30 | Technic Axle 7 | Light Bluish Gray | 44294 | 4211805 | €0,16 |
| 2 | Plate 1 x 10 | Black | 4477 | 447726 | €0,16 |
| 55 | Technic Axle 3 | Light Bluish Gray | 4519 | 4211815 | €0,05 |
| 1 | Pneumatic T-Piece (T Bar) [New Style] | Light Bluish Gray | 4697b | 4211508 | €0,13 |
| 1 | Technic Worm Gear | Light Bluish Gray | 4716 | 4211510 | — |
| 1 | Technic Worm Gear | Black | 4716 | 471626 | — |
| 1 | Pneumatic Switch with Pin Holes | Dark Bluish Gray | 47223a | 4237158 | — |
| 2 | Pneumatic Cylinder with 2 Inlets and Rounded End Medium (48mm) | Yellow | 47225 | 4205293 | — |
| 14 | Technic Pin Connector Hub Perpendicular 3L with 4 Pins | Light Bluish Gray | 48989 | 4225033 | — |
| 1 | Technic Turntable Large Type 2, 24/56 Tooth with Black Outside Gear Section [Complete Assembly] | Dark Bluish Gray | 50163 | 4235858 | — |
| 1 | Technic Axle 32 | Black | 50450 | 6210821 | €2,01 |
| 1 | Hose, Pneumatic 4mm D. 16L | Black | 5102c16 | 6352209 | — |
| 1 | Hose, Pneumatic 4mm D. 16L | Black | 5102c16 | 6352209 | — |
| 1 | Wire with Brick 2 x 2 x 2/3 Pair, 20L | Black | 5306bc020 | 4100355 | — |
| 2 | Pneumatic Cylinder Bracket | Yellow | 53178 | 4267463 | — |
| 1 | Sticker Sheet for Set 8421-1 | Unknown | 53535 | 4272325 | — |
| 2 | Plate Round 1 x 1 with Solid Stud | Trans-Red | 6141 | 6208450 | €0,04 |
| 6 | Plate Round 1 x 1 with Solid Stud | Trans-Clear | 6141 | 6514052 | €0,04 |
| 4 | Plate Round 1 x 1 with Solid Stud | Trans-Neon Orange | 6141 | 3005747 | — |
| 8 | Technic Axle and Pin Connector Perpendicular | Dark Bluish Gray | 6536 | 6261374 | €0,10 |
| 17 | Technic Axle and Pin Connector Perpendicular | Black | 6536 | 6261371 | €0,10 |
| 34 | Technic Axle and Pin Connector Perpendicular | Yellow | 6536 | 6261367 | €0,10 |
| 18 | Technic Axle and Pin Connector Perpendicular | Light Bluish Gray | 6536 | 6261375 | €0,10 |
| 15 | Technic Axle Connector Ridged [with x Hole x Orientation] | Black | 6538b | 4107083 | — |
| 27 | Technic Axle Connector Ridged [with x Hole x Orientation] | Light Bluish Gray | 6538b | 4211543 | — |
| 1 | Technic Driving Ring 2L, 4 Ridges | Red | 6539 | 4278957 | — |
| 2 | Technic Brick 1 x 1 with Pin Hole | Yellow | 6541 | 654124 | €0,07 |
| 5 | Technic Gear 16 Tooth with Clutch [Toothed] | Dark Gray | 6542a | 654227 | — |
| 2 | Technic Axle 1.5 with Perpendicular Axle Connector (Technic Pole Reverser Handle) | Black | 6553 | 4107765 | €0,19 |
| 158 | Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots | Black | 6558 | 655826 | — |
| 1 | Technic Gear Differential, 24 -16 Tooth with Clutch on Both Sides | Dark Bluish Gray | 6573 | 4211023 | — |
| 1 | Technic Axle 3 with Stud | Dark Bluish Gray | 6587 | 4211086 | — |
| 5 | Technic Gear 12 Tooth Bevel | Light Bluish Gray | 6589 | 4211539 | — |
| 3 | Technic Beam 1 x 9 Bent (6 - 4) Thick | Black | 6629 | 6279881 | €0,34 |
| 3 | Technic Beam 1 x 9 Bent (6 - 4) Thick | Yellow | 6629 | 6524459 | €0,34 |
| 2 | Technic Beam 1 x 3 Thin | Yellow | 6632 | 6344174 | €0,25 |
| 15 | Technic Beam 1 x 3 Thin | Light Bluish Gray | 6632 | 6360043 | €0,25 |
| 1 | Technic Changeover Catch - + opening | Red | 6641 | 4160522 | — |
| 1 | Hook, Technic - Large | Black | 70496 | 70644 | — |
| 2 | Technic Pin Connector Round [No Slot] | Black | 75535 | 75619 | — |
| 2 | Technic Gear 24 Tooth Clutch with Dark Bluish Gray Center | White | 76244 | 4107539 | — |

## Notes

- Track which of these parts you own and see what is missing: https://www.brickmissing.com/sets/8421-1-mobile-crane
- Inventory data is based on official LEGO inventories via the Rebrickable catalog, updated daily.
- Part images, minifigure lists and related sets are on the set page: https://www.brickmissing.com/sets/8421-1-mobile-crane