42121-1

Heavy-Duty Excavator

Set number: 42121-1
Year: 2021
Theme: Technic
Parts: 569
Minifigures: 0

Building instructions

The building instructions are on the official LEGO website. We do not host any instructions ourselves; the link below takes you to the official page.

View building instructions on LEGO.com (opens an external website)This set on Rebrickable (opens an external website)

Parts list – 42121-1 Heavy-Duty Excavator

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131 lines, 589 pieces

Parts list of set 42121-1
Part	Name	Colour	Quantity	Note
58176	Light Cover 1 x 1 Round with Internal Bar / Bionicle Barraki EyeBars, Ladders and Fences	Trans-Orange	1×
11477	Brick Curved 2 x 1 No Studs [1/2 Bow]Bricks Curved	Red	1×
15068	Brick Curved 2 x 2 x 2/3Bricks Curved	Yellow	4×
59900	Cone 1 x 1 [Top Groove]Bricks Round and Cones	Red	4×
61409	Brick Sloped 18° 2 x 1 x 2/3 with 4 Slots / GrateBricks Sloped	Black	4×
54200	Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)Bricks Sloped	Black	1×
47905	Brick Special 1 x 1 with Studs on 2 SidesBricks Special	Red	1×
57360	Hinge Cylinder 1 x 2 Locking with 2 Click Fingers and Axle Hole, 7 TeethHinges, Arms and Turntables	Black	1×
44567b	Hinge Plate 1 x 2 Locking with 1 Finger on Side, without GrooveHinges, Arms and Turntables	Black	1×
60849	Equipment Hose Nozzle / Gun with Side String Hole SimplifiedMinifig Accessories	Light Bluish Gray	2×
3023	Plate 1 x 2Plates	Yellow	1×
3623	Plate 1 x 3Plates	Red	1×
3710	Plate 1 x 4Plates	Yellow	1×
3022	Plate 2 x 2Plates	Black	1×
3032	Plate 4 x 6Plates	Yellow	1×
6141	Plate Round 1 x 1 with Solid StudPlates Round Curved and Dishes	White	4×
15573	Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper)Plates Special	Black	1×
18677	Plate Special 1 x 2 with Pin Hole UnderneathPlates Special	Black	2×
87580	Plate Special 2 x 2 with Groove and Center Stud (Jumper)Plates Special	Red	4×
72184	Sticker Sheet for Set 42121-1Stickers	[No Color/Any Color]	1×
32062	Technic Axle 2 NotchedTechnic Axles	Red	6×
4519	Technic Axle 3Technic Axles	Light Bluish Gray	13×
24316	Technic Axle 3 with StopTechnic Axles	Reddish Brown	10×
3705	Technic Axle 4Technic Axles	Black	6×
87083	Technic Axle 4 with StopTechnic Axles	Dark Bluish Gray	2×
32073	Technic Axle 5Technic Axles	Light Bluish Gray	1×
59426	Technic Axle 5.5 with Stop [Rounded Short End]Technic Axles	Dark Bluish Gray	1×
3706	Technic Axle 6Technic Axles	Red	1×
44294	Technic Axle 7Technic Axles	Yellow	1×
60485	Technic Axle 9Technic Axles	Light Bluish Gray	1×
32525	Technic Beam 1 x 11 ThickTechnic Beams	Dark Bluish Gray	5×
32525	Technic Beam 1 x 11 ThickTechnic Beams	Yellow	2×
32009	Technic Beam 1 x 11.5 Double Bent ThickTechnic Beams	Yellow	2×
32278	Technic Beam 1 x 15 ThickTechnic Beams	Dark Bluish Gray	6×
60483	Technic Beam 1 x 2 Thick with Pin Hole and Axle HoleTechnic Beams	Dark Bluish Gray	20×
41677	Technic Beam 1 x 2 ThinTechnic Beams	Black	10×
32523	Technic Beam 1 x 3 ThickTechnic Beams	Black	2×
32523	Technic Beam 1 x 3 ThickTechnic Beams	Yellow	5×
6632	Technic Beam 1 x 3 ThinTechnic Beams	Yellow	2×
32316	Technic Beam 1 x 5 ThickTechnic Beams	Black	5×
11478	Technic Beam 1 x 5 Thin with Axle Holes on EndsTechnic Beams	Black	2×
32063	Technic Beam 1 x 6 ThinTechnic Beams	Yellow	4×
32524	Technic Beam 1 x 7 ThickTechnic Beams	Dark Bluish Gray	1×
32524	Technic Beam 1 x 7 ThickTechnic Beams	Yellow	4×
32271	Technic Beam 1 x 9 Bent (7 - 3) ThickTechnic Beams	Black	4×
40490	Technic Beam 1 x 9 ThickTechnic Beams	Black	4×
40490	Technic Beam 1 x 9 ThickTechnic Beams	White	1×
71708	Technic Beam 2 x 3 L-Shape with Quarter Ellipse ThickTechnic Beams	Black	2×
71708	Technic Beam 2 x 3 L-Shape with Quarter Ellipse ThickTechnic Beams	Yellow	4×
32140	Technic Beam 2 x 4 L-Shape ThickTechnic Beams	Black	2×
32140	Technic Beam 2 x 4 L-Shape ThickTechnic Beams	Yellow	6×
32526	Technic Beam 3 x 5 L-Shape ThickTechnic Beams	Black	5×
32526	Technic Beam 3 x 5 L-Shape ThickTechnic Beams	Yellow	3×
32250	Technic Beam 3 x 5 L-Shape with Quarter Ellipse ThinTechnic Beams	Black	6×
99773	Technic Beam Triangle Thin [Type II]Technic Beams	Black	4×
39793	Technic Connector Beam 3 x 3Technic Beams	Black	3×
32000	Technic Brick 1 x 2 [2 Pin Holes]Technic Bricks	Black	1×
3713	Technic BushTechnic Bushes	Light Bluish Gray	1×
32123b	Technic Bush 1/2 Smooth with Axle Hole Semi-ReducedTechnic Bushes	Yellow	5×
59443	Technic Axle Connector Smooth [with x Hole + Orientation]Technic Connectors	Yellow	1×
32013	Technic Axle and Pin Connector Angled #1Technic Connectors	Black	1×
32034	Technic Axle and Pin Connector Angled #2 - 180°Technic Connectors	Black	3×
32014	Technic Axle and Pin Connector Angled #6 - 90°Technic Connectors	Black	3×
61904	Technic Axle and Pin Connector Block 4 x 3 x 2 1/2 [Linear Actuator Holder]Technic Connectors	Dark Bluish Gray	1×
6536	Technic Axle and Pin Connector PerpendicularTechnic Connectors	Black	8×
32184	Technic Axle and Pin Connector Perpendicular 3L with Centre Pin HoleTechnic Connectors	Black	1×
32184	Technic Axle and Pin Connector Perpendicular 3L with Centre Pin HoleTechnic Connectors	Light Bluish Gray	5×
41678	Technic Axle and Pin Connector Perpendicular Double SplitTechnic Connectors	Light Bluish Gray	4×
92907	Technic Axle and Pin Connector Perpendicular SplitTechnic Connectors	Light Bluish Gray	1×
63869	Technic Axle and Pin Connector Perpendicular TripleTechnic Connectors	Black	2×
63869	Technic Axle and Pin Connector Perpendicular TripleTechnic Connectors	Light Bluish Gray	4×
32126	Technic Axle and Pin Connector Toggle Joint SmoothTechnic Connectors	Black	2×
42195	Technic Driving Ring Connector Smooth [2 Rounded and 2 Flat Side Walls]Technic Connectors	Light Bluish Gray	3×
65489	Technic Pin Connector Hub Perpendicular 3L with 4 Pins (Squared Holes)Technic Connectors	Light Bluish Gray	1×
22961	Technic Pin Connector Hub with 1 AxleTechnic Connectors	Dark Bluish Gray	7×
65487	Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise [Centered Friction Ridge]Technic Connectors	Yellow	5×
27940	Technic Pin Connector Hub with 2 AxlesTechnic Connectors	Dark Bluish Gray	1×
44874	Technic Pin Connector Hub with 2 Pins with Friction Ridges Lengthwise [Small Squared Pin Holes]Technic Connectors	Light Bluish Gray	5×
44809	Technic Pin Connector Perpendicular 2 x 2 BentTechnic Connectors	Yellow	2×
18654	Technic Pin Connector Round 1L [Beam]Technic Connectors	Black	5×
18654	Technic Pin Connector Round 1L [Beam]Technic Connectors	Light Bluish Gray	1×
62462	Technic Pin Connector Round [Slotted]Technic Connectors	Black	4×
6589	Technic Gear 12 Tooth BevelTechnic Gears	Tan	1×
32270	Technic Gear 12 Tooth Double BevelTechnic Gears	Black	3×
94925	Technic Gear 16 Tooth Reinforced [New Style]Technic Gears	Light Bluish Gray	4×
32198	Technic Gear 20 Tooth BevelTechnic Gears	Tan	1×
18575	Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening]Technic Gears	Tan	1×
10928	Technic Gear 8 Tooth [Reinforced]Technic Gears	Dark Bluish Gray	6×
18939	Technic Turntable Large Type 3 BaseTechnic Gears	Light Bluish Gray	1×
18938	Technic Turntable Large Type 3 Top, 60 ToothTechnic Gears	Black	1×
24116	Technic Panel Curved and Bent 6 x 3Technic Panels	Trans-Clear	1×
24116	Technic Panel Curved and Bent 6 x 3Technic Panels	Yellow	3×
64683	Technic Panel Fairing # 3 Small Smooth Long, Side ATechnic Panels	Yellow	1×
64391	Technic Panel Fairing # 4 Small Smooth Long, Side BTechnic Panels	Yellow	1×
11947	Technic Panel Fairing #22 5L Small Smooth, Side ATechnic Panels	Yellow	1×
11214	Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L AxleTechnic Pins	Red	7×
18651	Technic Axle Pin 3L with Friction Ridges Lengthwise and 2L AxleTechnic Pins	Black	12×
43093	Technic Axle Pin with Friction Ridges LengthwiseTechnic Pins	Blue	14×
3749	Technic Axle Pin without Friction Ridges LengthwiseTechnic Pins	Tan	2×
4274	Technic Pin 1/2 without Friction RidgesTechnic Pins	Light Bluish Gray	15×
32002	Technic Pin 3/4Technic Pins	Tan	4×
65304	Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [2 Lateral Holes, Small Pin Hole]Technic Pins	Red	4×
32054	Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole]Technic Pins	Light Bluish Gray	6×
42924	Technic Pin Long with Friction Ridges Lengthwise, 1 Center SlotTechnic Pins	Blue	63×
39888	Technic Pin Long without Friction Ridges, with Anti-Roll NotchTechnic Pins	Tan	4×
61332	Technic Pin with Friction Ridges Lengthwise with No Center SlotsTechnic Pins	Black	38×
24120	Technic Digger Bucket 4 x 7Technic Special	Dark Bluish Gray	1×
92693	Technic Linear Actuator Mini with Dark Bluish Gray Head and Orange AxleTechnic Special	Light Bluish Gray	2×
15379	Technic Link Tread with Beveled EdgeTechnic Special	Black	86×
61903	Technic Universal Joint 3L [Complete Assembly]Technic Steering, Suspension and Engine	Light Bluish Gray	4×
3070b	Tile 1 x 1 with GrooveTiles	Red	2×
3069b	Tile 1 x 2 with GrooveTiles	Light Bluish Gray	2×
87079	Tile 2 x 4 with GrooveTiles	Yellow	1×
98138	Tile Round 1 x 1Tiles Round and Curved	Light Bluish Gray	1×
98138	Tile Round 1 x 1Tiles Round and Curved	Trans-Clear	2×
2412b	Tile Special 1 x 2 Grille with Bottom GrooveTiles Special	Black	4×
58176	Light Cover 1 x 1 Round with Internal Bar / Bionicle Barraki EyeBars, Ladders and Fences	Trans-Orange	1×	Spare
54200	Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)Bricks Sloped	Black	1×	Spare
60849	Equipment Hose Nozzle / Gun with Side String Hole SimplifiedMinifig Accessories	Light Bluish Gray	1×	Spare
6141	Plate Round 1 x 1 with Solid StudPlates Round Curved and Dishes	White	1×	Spare
3713	Technic BushTechnic Bushes	Light Bluish Gray	1×	Spare
32123b	Technic Bush 1/2 Smooth with Axle Hole Semi-ReducedTechnic Bushes	Yellow	1×	Spare
18654	Technic Pin Connector Round 1L [Beam]Technic Connectors	Black	1×	Spare
18654	Technic Pin Connector Round 1L [Beam]Technic Connectors	Light Bluish Gray	1×	Spare
4274	Technic Pin 1/2 without Friction RidgesTechnic Pins	Light Bluish Gray	2×	Spare
32002	Technic Pin 3/4Technic Pins	Tan	1×	Spare
61332	Technic Pin with Friction Ridges Lengthwise with No Center SlotsTechnic Pins	Black	2×	Spare
15379	Technic Link Tread with Beveled EdgeTechnic Special	Black	4×	Spare
3070b	Tile 1 x 1 with GrooveTiles	Red	1×	Spare
98138	Tile Round 1 x 1Tiles Round and Curved	Light Bluish Gray	1×	Spare
98138	Tile Round 1 x 1Tiles Round and Curved	Trans-Clear	1×	Spare