How many pieces does the LEGO Heavy-Duty Excavator (42121-1) have?

The LEGO Heavy-Duty Excavator set (42121-1) contains 569 pieces. It was released in 2021 as part of the LEGO Technic theme.

How can I find missing parts for LEGO set 42121-1?

On BrickMissing you can check which parts from the LEGO Heavy-Duty Excavator (42121-1) you already own. Add your LEGO collection and we'll show exactly which of the 569 pieces you're missing and which you already have.

Can I build the LEGO Heavy-Duty Excavator with parts I already have?

Use BrickMissing's free parts checker to find out. Add LEGO sets you own to your collection and we'll cross-reference all 569 parts to show your buildability percentage and which specific pieces you still need.

What theme is the LEGO Heavy-Duty Excavator from?

The LEGO Heavy-Duty Excavator (42121-1) belongs to the LEGO Technic theme. You can browse all Technic sets on BrickMissing to find more sets from this theme.

Heavy-Duty Excavator

🏷️ 42121-1•🎨 Technic•📅 2021•🧱 569 parts•Intermediate

The LEGO Technic Heavy-Duty Excavator (42121-1) offers an intricate look at construction machinery. This 569-piece model features a shovel that moves up and down, a movable arm, and running belts for movement. The excavator body rotates 360 degrees, and its cabin includes a driver's seat and control panel. The set comes with LEGO brick ‘stones’ for digging and four cones. As a 2-in-1 build, the model reconstructs into a tracked tractor equipped with a backhoe, demonstrating Technic's mechanical design principles.

Parts Inventory

🧱 569 parts

Part	Color	Qty
Technic Gear 8 Tooth [Reinforced] 10928	Dark Bluish Gray	6×
Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle 11214	Red	7×
Slope Curved 2 x 1 No Studs [1/2 Bow] 11477	Red	1×
Technic Beam 1 x 5 Thin with Axle Holes on Ends 11478	Black	2×
Technic Panel Fairing #22 5L Small Smooth, Side A 11947	Yellow	1×
Slope Curved 2 x 2 x 2/3 15068	Yellow	4×
Technic Link Tread with Beveled Edge 15379	Black	86×
Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) 15573	Black	1×
Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening] 18575	Tan	1×
Technic Axle Pin 3L with Friction Ridges Lengthwise and 2L Axle 18651	Black	12×

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Slope Curved 2 x 2 x 2/3	15068	Yellow	4×
Technic Link Tread with Beveled Edge	15379	Black	86×
Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper)	15573	Black	1×
Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening]	18575	Tan	1×
Technic Axle Pin 3L with Friction Ridges Lengthwise and 2L Axle	18651	Black	12×
Technic Pin Connector Round 1L [Beam]	18654	Black	5×
Technic Pin Connector Round 1L [Beam]	18654	Light Bluish Gray	1×
Plate Special 1 x 2 with Pin Hole Underneath	18677	Black	2×
Technic Turntable Large Type 3 Top, 60 Tooth	18938	Black	1×
Technic Turntable Large Type 3 Base	18939	Light Bluish Gray	1×
Technic Pin Connector Hub with 1 Axle	22961	Dark Bluish Gray	7×
Technic Panel Curved and Bent 6 x 3	24116	Yellow	3×
Technic Panel Curved and Bent 6 x 3	24116	Trans-Clear	1×
Technic Digger Bucket 4 x 7	24120	Dark Bluish Gray	1×
Tile Special 1 x 2 Grille with Bottom Groove	2412b	Black	4×
Technic Axle 3 with Stop	24316	Reddish Brown	10×
Technic Pin Connector Hub with 2 Axles	27940	Dark Bluish Gray	1×
Plate 2 x 2	3022	Black	1×
Plate 1 x 2	3023	Yellow	1×
Plate 4 x 6	3032	Yellow	1×
Tile 1 x 2 with Groove	3069b	Light Bluish Gray	2×
Tile 1 x 1 with Groove	3070b	Red	2×
Technic Brick 1 x 2 [2 Pin Holes]	32000	Black	1×
Technic Pin 3/4	32002	Tan	4×
Technic Beam 1 x 11.5 Double Bent Thick	32009	Yellow	2×
Technic Axle and Pin Connector Angled #1	32013	Black	1×
Technic Axle and Pin Connector Angled #6 - 90°	32014	Black	3×
Technic Axle and Pin Connector Angled #2 - 180°	32034	Black	3×
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole]	32054	Light Bluish Gray	6×
Technic Axle 2 Notched	32062	Red	6×
Technic Beam 1 x 6 Thin	32063	Yellow	4×
Technic Axle 5	32073	Light Bluish Gray	1×
Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced	32123b	Yellow	5×
Technic Axle and Pin Connector Toggle Joint Smooth	32126	Black	2×
Technic Beam 2 x 4 L-Shape Thick	32140	Yellow	6×
Technic Beam 2 x 4 L-Shape Thick	32140	Black	2×
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole	32184	Light Bluish Gray	5×
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole	32184	Black	1×
Technic Gear 20 Tooth Bevel	32198	Tan	1×
Technic Beam 3 x 5 L-Shape with Quarter Ellipse Thin	32250	Black	6×
Technic Gear 12 Tooth Double Bevel	32270	Black	3×
Technic Beam 1 x 9 Bent (7 - 3) Thick	32271	Black	4×
Technic Beam 1 x 15 Thick	32278	Dark Bluish Gray	6×
Technic Beam 1 x 5 Thick	32316	Black	5×
Technic Beam 1 x 3 Thick	32523	Black	2×
Technic Beam 1 x 3 Thick	32523	Yellow	5×
Technic Beam 1 x 7 Thick	32524	Yellow	4×
Technic Beam 1 x 7 Thick	32524	Dark Bluish Gray	1×
Technic Beam 1 x 11 Thick	32525	Yellow	2×
Technic Beam 1 x 11 Thick	32525	Dark Bluish Gray	5×
Technic Beam 3 x 5 L-Shape Thick	32526	Yellow	3×
Technic Beam 3 x 5 L-Shape Thick	32526	Black	5×
Plate 1 x 3	3623	Red	1×
Technic Axle 4	3705	Black	6×
Technic Axle 6	3706	Red	1×
Plate 1 x 4	3710	Yellow	1×
Technic Bush	3713	Light Bluish Gray	1×
Technic Axle Pin without Friction Ridges Lengthwise	3749	Tan	2×
Technic Connector Beam 3 x 3	39793	Black	3×
Technic Pin Long without Friction Ridges, with Anti-Roll Notch	39888	Tan	4×
Technic Beam 1 x 9 Thick	40490	Black	4×
Technic Beam 1 x 9 Thick	40490	White	1×
Technic Beam 1 x 2 Thin	41677	Black	10×
Technic Axle and Pin Connector Perpendicular Double Split	41678	Light Bluish Gray	4×
Technic Driving Ring Connector Smooth [2 rounded and 2 flat side walls]	42195	Light Bluish Gray	3×
Technic Pin 1/2	4274	Light Bluish Gray	15×
Technic Pin Long with Friction Ridges Lengthwise, 1 Center Slot	42924	Black	63×
Technic Axle Pin with Friction Ridges Lengthwise	43093	Black	14×
Technic Axle 7	44294	Yellow	1×
Hinge Plate 1 x 2 Locking with 1 Finger on Side, without Groove	44567b	Black	1×
Technic Pin Connector Perpendicular 2 x 2 Bent	44809	Yellow	2×
Technic Pin Connector Hub with 2 Pins with Friction Ridges Lengthwise [Small Squared Pin Holes]	44874	Light Bluish Gray	5×
Technic Axle 3	4519	Light Bluish Gray	13×
Brick Special 1 x 1 with Studs on 2 Sides	47905	Red	1×
Slope 30° 1 x 1 x 2/3 (Cheese Slope)	54200	Black	1×
Hinge Cylinder 1 x 2 Locking with 2 Click Fingers and Axle Hole, 7 Teeth	57360	Black	1×
Light Cover 1 x 1 Round with Internal Bar / Bionicle Barraki Eye	58176	Trans-Orange	1×
Technic Axle 5.5 with Stop [Rounded Short End]	59426	Dark Bluish Gray	1×
Technic Axle Connector Smooth [with x Hole + Orientation]	59443	Yellow	1×
Cone 1 x 1 [Top Groove]	59900	Red	4×
Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole	60483	Dark Bluish Gray	20×
Technic Axle 9	60485	Light Bluish Gray	1×
Equipment Hose Nozzle / Gun with Side String Hole Simplified	60849	Light Bluish Gray	2×
Technic Pin with Friction Ridges Lengthwise with No Center Slots	61332	Black	38×
Slope 18° 2 x 1 x 2/3 with 4 Slots / Grate	61409	Black	4×
Plate Round 1 x 1 with Solid Stud	6141	White	4×
Technic Universal Joint 3L [Complete Assembly]	61903	Light Bluish Gray	4×
Technic Axle and Pin Connector Block 4 x 3 x 2 1/2 [Linear Actuator Holder]	61904	Dark Bluish Gray	1×
Technic Pin Connector Round [Slotted]	62462	Black	4×
Technic Axle and Pin Connector Perpendicular Triple	63869	Black	2×
Technic Axle and Pin Connector Perpendicular Triple	63869	Light Bluish Gray	4×
Technic Panel Fairing # 4 Small Smooth Long, Side B	64391	Yellow	1×
Technic Panel Fairing # 3 Small Smooth Long, Side A	64683	Yellow	1×
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [2 Lateral Holes, Small Pin Hole]	65304	Red	4×
Technic Axle and Pin Connector Perpendicular	6536	Black	8×
Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise [Square Holes]	65487	Yellow	5×
Technic Pin Connector Hub Perpendicular 3L with 4 Pins (Squared Holes)	65489	Light Bluish Gray	1×
Technic Gear 12 Tooth Bevel	6589	Tan	1×
Technic Beam 1 x 3 Thin	6632	Yellow	2×
Technic Beam 2 x 3 L-Shape with Quarter Ellipse Thick	71708	Yellow	4×
Technic Beam 2 x 3 L-Shape with Quarter Ellipse Thick	71708	Black	2×
Sticker Sheet for Set 42121-1	72184	Unknown	1×
Tile 2 x 4 with Groove	87079	Yellow	1×
Technic Axle 4 with Stop	87083	Dark Bluish Gray	2×
Plate Special 2 x 2 with Groove and Center Stud (Jumper)	87580	Red	4×
Technic Linear Actuator Mini with Dark Bluish Gray Head and Orange Axle	92693	Light Bluish Gray	2×
Technic Axle and Pin Connector Perpendicular Split	92907	Light Bluish Gray	1×
Technic Gear 16 Tooth Reinforced [New Style]	94925	Light Bluish Gray	4×
Tile Round 1 x 1	98138	Trans-Clear	2×
Tile Round 1 x 1	98138	Light Bluish Gray	1×
Technic Beam Triangle Thin [Type II]	99773	Black	4×

Build DNA

Parts inventory insights for Heavy-Duty Excavator

569 pieces puts this build -12% against the average Technic set and +6% against the average 2021 release.

LEGOTECHNIC

Vs average Technic set

-12%-78 parts

This set569

Average set647

Average Technic set: 647 pieces across 450 other sets.

Vs average 2021 set

+6%+30 parts

This set569

Average set539

Average 2021 set: 539 pieces across 471 other sets.

Color profile

12different colors

Dominant color

Black

Black317x

56%

Light Bluish Gray77x

14%

Yellow60x

11%

Dark Bluish Gray51x

Unique parts

5.5 pieces per unique type

104

Repeat factor

Average pieces per unique type.

Most used part

Technic Link Tread with Beveled Edge

86x

Results are based on official LEGO part inventories. Accuracy improves as you confirm set completeness.

This site is not affiliated with or endorsed by the LEGO Group.

Build Insights🧩104unique parts🎨12different colors📊47.4avg. parts per color🏆86×Technic Link Tread with Beveled Edge

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