Heavy-Duty Excavator (42121-1) is a Technic LEGO set released in 2021 with 569 pieces. Browse the parts list, minifigures, and verify loose bricks with our free scanner. This set includes 116 unique part types.
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Building instructions
Official LEGO instructions — read on BrickID
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Parts in this set
116 parts · page 1 of 3 · updating…
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Brick Special 1 x 1 with Studs on 2 Sides47905 · ×1 · Red -
![Cone 1 x 1 [Top Groove]](https://cdn.rebrickable.com/media/parts/elements/4529234.jpg)
Cone 1 x 1 [Top Groove]59900 · ×4 · Red -
Equipment Hose Nozzle / Gun with Side String Hole Simplified60849 · ×2 · Light Bluish Gray -
Hinge Cylinder 1 x 2 Locking with 2 Click Fingers and Axle Hole, 7 Teeth57360 · ×1 · Black -
Hinge Plate 1 x 2 Locking with 1 Finger on Side, without Groove44567b · ×1 · Black -
Light Cover 1 x 1 Round with Internal Bar / Bionicle Barraki Eye58176 · ×1 · Trans-Orange -
Plate 1 x 23023 · ×1 · Yellow -
Plate 1 x 33623 · ×1 · Red -
Plate 1 x 43710 · ×1 · Yellow -
Plate 2 x 23022 · ×1 · Black -
Plate 4 x 63032 · ×1 · Yellow -
Plate Round 1 x 1 with Solid Stud6141 · ×4 · White -
Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper)15573 · ×1 · Black -
Plate Special 1 x 2 with Pin Hole Underneath18677 · ×2 · Black -
Plate Special 2 x 2 with Groove and Center Stud (Jumper)87580 · ×4 · Red -
Slope 18° 2 x 1 x 2/3 with 4 Slots / Grate61409 · ×4 · Black -
Slope 30° 1 x 1 x 2/3 (Cheese Slope)54200 · ×1 · Black -
![Slope Curved 2 x 1 No Studs [1/2 Bow]](https://cdn.rebrickable.com/media/parts/elements/6029946.jpg)
Slope Curved 2 x 1 No Studs [1/2 Bow]11477 · ×1 · Red -
Slope Curved 2 x 2 x 2/315068 · ×4 · Yellow -
Sticker Sheet for Set 42121-172184 · ×1 · [No Color/Any Color] -
Technic Axle 2 Notched32062 · ×6 · Red -
Technic Axle 34519 · ×13 · Light Bluish Gray -
Technic Axle 3 with Stop24316 · ×10 · Reddish Brown -
Technic Axle 43705 · ×6 · Black -
Technic Axle 4 with Stop87083 · ×2 · Dark Bluish Gray -
Technic Axle 532073 · ×1 · Light Bluish Gray -
![Technic Axle 5.5 with Stop [Rounded Short End]](https://cdn.rebrickable.com/media/parts/elements/4508553.jpg)
Technic Axle 5.5 with Stop [Rounded Short End]59426 · ×1 · Dark Bluish Gray -
Technic Axle 63706 · ×1 · Red -
Technic Axle 744294 · ×1 · Yellow -
Technic Axle 960485 · ×1 · Light Bluish Gray -
Technic Axle and Pin Connector Angled #132013 · ×1 · Black -
Technic Axle and Pin Connector Angled #2 - 180°32034 · ×3 · Black -
Technic Axle and Pin Connector Angled #6 - 90°32014 · ×3 · Black -
![Technic Axle and Pin Connector Block 4 x 3 x 2 1/2 [Linear Actuator Holder]](https://cdn.rebrickable.com/media/parts/elements/4528038.jpg)
Technic Axle and Pin Connector Block 4 x 3 x 2 1/2 [Linear Actuator Holder]61904 · ×1 · Dark Bluish Gray -
Technic Axle and Pin Connector Perpendicular6536 · ×8 · Black -
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole32184 · ×1 · Black -
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole32184 · ×5 · Light Bluish Gray -
Technic Axle and Pin Connector Perpendicular Double Split41678 · ×4 · Light Bluish Gray -
Technic Axle and Pin Connector Perpendicular Split92907 · ×1 · Light Bluish Gray -
Technic Axle and Pin Connector Perpendicular Triple63869 · ×4 · Light Bluish Gray -
Technic Axle and Pin Connector Perpendicular Triple63869 · ×2 · Black -
Technic Axle and Pin Connector Toggle Joint Smooth32126 · ×2 · Black -
![Technic Axle Connector Smooth [with x Hole + Orientation]](https://cdn.rebrickable.com/media/parts/elements/4519010.jpg)
Technic Axle Connector Smooth [with x Hole + Orientation]59443 · ×1 · Yellow -
Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle11214 · ×7 · Red -
Technic Axle Pin 3L with Friction Ridges Lengthwise and 2L Axle18651 · ×12 · Black -
Technic Axle Pin with Friction Ridges Lengthwise43093 · ×14 · Blue -
Technic Axle Pin without Friction Ridges Lengthwise3749 · ×2 · Tan -
Technic Beam 1 x 11 Thick32525 · ×5 · Dark Bluish Gray