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. Collectors browsing Technic sets use this inventory to verify loose parts, compare color variants, and read official build manuals without downloading PDFs. 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 · ×2 · Black -
Technic Axle and Pin Connector Perpendicular Triple63869 · ×4 · Light Bluish Gray -
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 · ×2 · Yellow