LEGO 42121
Heavy-Duty Excavator

LEGO 42121 Heavy-Duty Excavator box image
Set number
42121
Theme
Technic
Pieces
569 pcs
Year
2021
Lowest new price¥20,698〜Used avg¥5,114as of 7/26
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“Heavy-Duty Excavator” is LEGO® “Technic” theme set number 42121. Released in 2021, it has 569 pieces. With Re:GO you can automatically work out what percentage of this set you can build from the LEGO parts you already own, along with the missing parts and an estimated cost. Use the links below to compare prices on Amazon, Rakuten, Yahoo! Shopping, Mercari and Yahoo! Auctions, and find the best deal on new, used, or individual parts.

Part breakdown 116 types

Color split (most first)
Black×240
Light Bluish Gray×77
Blue×77
Yellow×60
Dark Bluish Gray×51
Red×31
Tan×13
Reddish Brown×10
White×5
Trans-Clear×3
Trans-Orange×1
[No Color/Any Color]×1
Main parts (most used first)
15379 Technic Link Tread with Beveled Edge
Black · ×86
42924 Technic Pin Long with Friction Ridges Lengthwise, 1 Center Slot
Blue · ×63
61332 Technic Pin with Friction Ridges Lengthwise with No Center Slots
Black · ×38
60483 Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole
Dark Bluish Gray · ×20
4274 Technic Pin 1/2
Light Bluish Gray · ×15
43093 Technic Axle Pin with Friction Ridges Lengthwise
Blue · ×14
4519 Technic Axle 3
Light Bluish Gray · ×13
18651 Technic Axle Pin 3L with Friction Ridges Lengthwise and 2L Axle
Black · ×12
24316 Technic Axle 3 with Stop
Reddish Brown · ×10
41677 Technic Beam 1 x 2 Thin
Black · ×10
6536 Technic Axle and Pin Connector Perpendicular
Black · ×8
11214 Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle
Red · ×7
22961 Technic Pin Connector Hub with 1 Axle
Dark Bluish Gray · ×7
10928 Technic Gear 8 Tooth [Reinforced]
Dark Bluish Gray · ×6
32054 Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole]
Light Bluish Gray · ×6
32062 Technic Axle 2 Notched
Red · ×6
32140 Technic Beam 2 x 4 L-Shape Thick
Yellow · ×6
32250 Technic Beam 3 x 5 L-Shape with Quarter Ellipse Thin
Black · ×6
32278 Technic Beam 1 x 15 Thick
Dark Bluish Gray · ×6
3705 Technic Axle 4
Black · ×6
18654 Technic Pin Connector Round 1L [Beam]
Black · ×5
32123b Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced
Yellow · ×5
32184 Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole
Light Bluish Gray · ×5
32316 Technic Beam 1 x 5 Thick
Black · ×5

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