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Discover the magic of Heavy-Duty Excavator from the Technic collection. Where creativity meets imagination.

Heavy-Duty Excavator
LEGO® Technic

Heavy-Duty Excavator

Set #42121

569
Pieces
2021
Year

Investment Analysis

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Complete Specifications

Theme Technic

Parts Parts Inventory

All 104 unique parts • Total pieces: 564

Technic Link Tread with Beveled Edge
Technic Link Tread with Beveled Edge
Part #: 15379 Color: Black Category: 26
86×
Technic Pin Long with Friction Ridges Lengthwise, 1 Center Slot
Technic Pin Long with Friction Ridges Lengthwise, 1 Center Slot
Part #: 42924 Color: Blue Category: 53
63×
Technic Pin with Friction Ridges Lengthwise with No Center Slots
Technic Pin with Friction Ridges Lengthwise with No Center Slots
Part #: 61332 Color: Black Category: 53
38×
Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole
Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole
Part #: 60483 Color: Dark Bluish Gray Category: 51
20×
Technic Pin 1/2
Technic Pin 1/2
Part #: 4274 Color: Light Bluish Gray Category: 53
15×
Technic Axle Pin with Friction Ridges Lengthwise
Technic Axle Pin with Friction Ridges Lengthwise
Part #: 43093 Color: Blue Category: 53
14×
Technic Axle 3
Technic Axle 3
Part #: 4519 Color: Light Bluish Gray Category: 46
13×
Technic Axle Pin 3L with Friction Ridges Lengthwise and 2L Axle
Technic Axle Pin 3L with Friction Ridges Lengthwise and 2L Axle
Part #: 18651 Color: Black Category: 53
12×
Technic Beam 1 x 2 Thin
Technic Beam 1 x 2 Thin
Part #: 41677 Color: Black Category: 51
10×
Technic Axle 3 with Stop
Technic Axle 3 with Stop
Part #: 24316 Color: Reddish Brown Category: 46
10×
Technic Axle and Pin Connector Perpendicular
Technic Axle and Pin Connector Perpendicular
Part #: 6536 Color: Black Category: 12
Technic Pin Connector Hub with 1 Axle
Technic Pin Connector Hub with 1 Axle
Part #: 22961 Color: Dark Bluish Gray Category: 12
Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle
Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle
Part #: 11214 Color: Red Category: 53
Technic Gear 8 Tooth [Reinforced]
Technic Gear 8 Tooth [Reinforced]
Part #: 10928 Color: Dark Bluish Gray Category: 52
Technic Axle 2 Notched
Technic Axle 2 Notched
Part #: 32062 Color: Red Category: 46
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole]
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole]
Part #: 32054 Color: Light Bluish Gray Category: 53
Technic Axle 4
Technic Axle 4
Part #: 3705 Color: Black Category: 46
Technic Beam 1 x 15 Thick
Technic Beam 1 x 15 Thick
Part #: 32278 Color: Dark Bluish Gray Category: 51
Technic Beam 3 x 5 L-Shape with Quarter Ellipse Thin
Technic Beam 3 x 5 L-Shape with Quarter Ellipse Thin
Part #: 32250 Color: Black Category: 51
Technic Beam 2 x 4 L-Shape Thick
Technic Beam 2 x 4 L-Shape Thick
Part #: 32140 Color: Yellow Category: 51
Technic Pin Connector Hub with 2 Pins with Friction Ridges Lengthwise [Small Squared Pin Holes]
Technic Pin Connector Hub with 2 Pins with Friction Ridges Lengthwise [Small Squared Pin Holes]
Part #: 44874 Color: Light Bluish Gray Category: 12
Technic Beam 1 x 3 Thick
Technic Beam 1 x 3 Thick
Part #: 32523 Color: Yellow Category: 51
Technic Beam 1 x 5 Thick
Technic Beam 1 x 5 Thick
Part #: 32316 Color: Black Category: 51
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole
Part #: 32184 Color: Light Bluish Gray Category: 12
Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced
Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced
Part #: 32123b Color: Yellow Category: 54
Technic Beam 3 x 5 L-Shape Thick
Technic Beam 3 x 5 L-Shape Thick
Part #: 32526 Color: Black Category: 51
Technic Beam 1 x 11 Thick
Technic Beam 1 x 11 Thick
Part #: 32525 Color: Dark Bluish Gray Category: 51
Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise [Square Holes]
Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise [Square Holes]
Part #: 65487 Color: Yellow Category: 12
Technic Pin 3/4
Technic Pin 3/4
Part #: 32002 Color: Tan Category: 53
Slope Curved 2 x 2 x 2/3
Slope Curved 2 x 2 x 2/3
Part #: 15068 Color: Yellow Category: 37
Tile Special 1 x 2 Grille with Bottom Groove
Tile Special 1 x 2 Grille with Bottom Groove
Part #: 2412b Color: Black Category: 15
Technic Beam 1 x 6 Thin
Technic Beam 1 x 6 Thin
Part #: 32063 Color: Yellow Category: 51
Technic Beam 1 x 9 Bent (7 - 3) Thick
Technic Beam 1 x 9 Bent (7 - 3) Thick
Part #: 32271 Color: Black Category: 51
Technic Beam 1 x 7 Thick
Technic Beam 1 x 7 Thick
Part #: 32524 Color: Yellow Category: 51
Technic Pin Long without Friction Ridges, with Anti-Roll Notch
Technic Pin Long without Friction Ridges, with Anti-Roll Notch
Part #: 39888 Color: Tan Category: 53
Technic Beam 1 x 9 Thick
Technic Beam 1 x 9 Thick
Part #: 40490 Color: Black Category: 51
Technic Axle and Pin Connector Perpendicular Double Split
Technic Axle and Pin Connector Perpendicular Double Split
Part #: 41678 Color: Light Bluish Gray Category: 12
Cone 1 x 1 [Top Groove]
Cone 1 x 1 [Top Groove]
Part #: 59900 Color: Red Category: 20
Slope 18° 2 x 1 x 2/3 with 4 Slots / Grate
Slope 18° 2 x 1 x 2/3 with 4 Slots / Grate
Part #: 61409 Color: Black Category: 3
Plate Round 1 x 1 with Solid Stud
Plate Round 1 x 1 with Solid Stud
Part #: 6141 Color: White Category: 21
Technic Universal Joint 3L [Complete Assembly]
Technic Universal Joint 3L [Complete Assembly]
Part #: 61903 Color: Light Bluish Gray Category: 25
Technic Pin Connector Round [Slotted]
Technic Pin Connector Round [Slotted]
Part #: 62462 Color: Black Category: 12
Technic Axle and Pin Connector Perpendicular Triple
Technic Axle and Pin Connector Perpendicular Triple
Part #: 63869 Color: Light Bluish Gray Category: 12
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [2 Lateral Holes, Small Pin Hole]
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [2 Lateral Holes, Small Pin Hole]
Part #: 65304 Color: Red Category: 53
Technic Beam 2 x 3 L-Shape with Quarter Ellipse Thick
Technic Beam 2 x 3 L-Shape with Quarter Ellipse Thick
Part #: 71708 Color: Yellow Category: 51
Plate Special 2 x 2 with Groove and Center Stud (Jumper)
Plate Special 2 x 2 with Groove and Center Stud (Jumper)
Part #: 87580 Color: Red Category: 9
Technic Gear 16 Tooth Reinforced [New Style]
Technic Gear 16 Tooth Reinforced [New Style]
Part #: 94925 Color: Light Bluish Gray Category: 52
Technic Beam Triangle Thin [Type II]
Technic Beam Triangle Thin [Type II]
Part #: 99773 Color: Black Category: 51
Technic Panel Curved and Bent 6 x 3
Technic Panel Curved and Bent 6 x 3
Part #: 24116 Color: Yellow Category: 40
Technic Axle and Pin Connector Angled #2 - 180°
Technic Axle and Pin Connector Angled #2 - 180°
Part #: 32034 Color: Black Category: 12
Technic Connector Beam 3 x 3
Technic Connector Beam 3 x 3
Part #: 39793 Color: Black Category: 51
Technic Driving Ring Connector Smooth [2 rounded and 2 flat side walls]
Technic Driving Ring Connector Smooth [2 rounded and 2 flat side walls]
Part #: 42195 Color: Light Bluish Gray Category: 12
Technic Gear 12 Tooth Double Bevel
Technic Gear 12 Tooth Double Bevel
Part #: 32270 Color: Black Category: 52
Technic Beam 3 x 5 L-Shape Thick
Technic Beam 3 x 5 L-Shape Thick
Part #: 32526 Color: Yellow Category: 51
Technic Axle and Pin Connector Angled #6 - 90°
Technic Axle and Pin Connector Angled #6 - 90°
Part #: 32014 Color: Black Category: 12
Technic Beam 1 x 5 Thin with Axle Holes on Ends
Technic Beam 1 x 5 Thin with Axle Holes on Ends
Part #: 11478 Color: Black Category: 51
Technic Pin Connector Perpendicular 2 x 2 Bent
Technic Pin Connector Perpendicular 2 x 2 Bent
Part #: 44809 Color: Yellow Category: 12
Technic Axle and Pin Connector Toggle Joint Smooth
Technic Axle and Pin Connector Toggle Joint Smooth
Part #: 32126 Color: Black Category: 12
Technic Beam 2 x 4 L-Shape Thick
Technic Beam 2 x 4 L-Shape Thick
Part #: 32140 Color: Black Category: 51
Tile 1 x 1 with Groove
Tile 1 x 1 with Groove
Part #: 3070b Color: Red Category: 19
Equipment Hose Nozzle / Gun with Side String Hole Simplified
Equipment Hose Nozzle / Gun with Side String Hole Simplified
Part #: 60849 Color: Light Bluish Gray Category: 27
Tile 1 x 2 with Groove
Tile 1 x 2 with Groove
Part #: 3069b Color: Light Bluish Gray Category: 19
Technic Beam 1 x 3 Thin
Technic Beam 1 x 3 Thin
Part #: 6632 Color: Yellow Category: 51
Technic Beam 1 x 11 Thick
Technic Beam 1 x 11 Thick
Part #: 32525 Color: Yellow Category: 51
Technic Beam 2 x 3 L-Shape with Quarter Ellipse Thick
Technic Beam 2 x 3 L-Shape with Quarter Ellipse Thick
Part #: 71708 Color: Black Category: 51
Technic Axle 4 with Stop
Technic Axle 4 with Stop
Part #: 87083 Color: Dark Bluish Gray Category: 46
Technic Axle and Pin Connector Perpendicular Triple
Technic Axle and Pin Connector Perpendicular Triple
Part #: 63869 Color: Black Category: 12
Technic Linear Actuator Mini with Dark Bluish Gray Head and Orange Axle
Technic Linear Actuator Mini with Dark Bluish Gray Head and Orange Axle
Part #: 92693 Color: Light Bluish Gray Category: 26
Technic Beam 1 x 3 Thick
Technic Beam 1 x 3 Thick
Part #: 32523 Color: Black Category: 51
Plate Special 1 x 2 with Pin Hole Underneath
Plate Special 1 x 2 with Pin Hole Underneath
Part #: 18677 Color: Black Category: 9
Technic Axle Pin without Friction Ridges Lengthwise
Technic Axle Pin without Friction Ridges Lengthwise
Part #: 3749 Color: Tan Category: 53
Technic Beam 1 x 11.5 Double Bent Thick
Technic Beam 1 x 11.5 Double Bent Thick
Part #: 32009 Color: Yellow Category: 51
Technic Axle Connector Smooth [with x Hole + Orientation]
Technic Axle Connector Smooth [with x Hole + Orientation]
Part #: 59443 Color: Yellow Category: 12
Tile Round 1 x 1
Tile Round 1 x 1
Part #: 98138 Color: Light Bluish Gray Category: 67
Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper)
Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper)
Part #: 15573 Color: Black Category: 9
Technic Axle 9
Technic Axle 9
Part #: 60485 Color: Light Bluish Gray Category: 46
Technic Panel Fairing #22 5L Small Smooth, Side A
Technic Panel Fairing #22 5L Small Smooth, Side A
Part #: 11947 Color: Yellow Category: 40
Sticker Sheet for Set 42121-1
Sticker Sheet for Set 42121-1
Part #: 72184 Color: [No Color/Any Color] Category: 58
Plate 2 x 2
Plate 2 x 2
Part #: 3022 Color: Black Category: 14
Technic Axle and Pin Connector Block 4 x 3 x 2 1/2 [Linear Actuator Holder]
Technic Axle and Pin Connector Block 4 x 3 x 2 1/2 [Linear Actuator Holder]
Part #: 61904 Color: Dark Bluish Gray Category: 12
Tile Round 1 x 1
Tile Round 1 x 1
Part #: 98138 Color: Trans-Clear Category: 67
Technic Panel Fairing # 4 Small Smooth Long, Side B
Technic Panel Fairing # 4 Small Smooth Long, Side B
Part #: 64391 Color: Yellow Category: 40
Technic Panel Fairing # 3 Small Smooth Long, Side A
Technic Panel Fairing # 3 Small Smooth Long, Side A
Part #: 64683 Color: Yellow Category: 40
Technic Axle and Pin Connector Perpendicular Split
Technic Axle and Pin Connector Perpendicular Split
Part #: 92907 Color: Light Bluish Gray Category: 12
Technic Axle and Pin Connector Angled #1
Technic Axle and Pin Connector Angled #1
Part #: 32013 Color: Black Category: 12
Technic Axle 5
Technic Axle 5
Part #: 32073 Color: Light Bluish Gray Category: 46
Technic Brick 1 x 2 [2 Pin Holes]
Technic Brick 1 x 2 [2 Pin Holes]
Part #: 32000 Color: Black Category: 8
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole
Part #: 32184 Color: Black Category: 12
Technic Gear 20 Tooth Bevel
Technic Gear 20 Tooth Bevel
Part #: 32198 Color: Tan Category: 52
Plate 4 x 6
Plate 4 x 6
Part #: 3032 Color: Yellow Category: 14
Slope Curved 2 x 1 No Studs [1/2 Bow]
Slope Curved 2 x 1 No Studs [1/2 Bow]
Part #: 11477 Color: Red Category: 37
Plate 1 x 2
Plate 1 x 2
Part #: 3023 Color: Yellow Category: 14
Tile 2 x 4 with Groove
Tile 2 x 4 with Groove
Part #: 87079 Color: Yellow Category: 19
Technic Pin Connector Hub with 2 Axles
Technic Pin Connector Hub with 2 Axles
Part #: 27940 Color: Dark Bluish Gray Category: 12
Technic Pin Connector Hub Perpendicular 3L with 4 Pins (Squared Holes)
Technic Pin Connector Hub Perpendicular 3L with 4 Pins (Squared Holes)
Part #: 65489 Color: Light Bluish Gray Category: 12
Technic Beam 1 x 7 Thick
Technic Beam 1 x 7 Thick
Part #: 32524 Color: Dark Bluish Gray Category: 51
Technic Digger Bucket 4 x 7
Technic Digger Bucket 4 x 7
Part #: 24120 Color: Dark Bluish Gray Category: 26
Technic Panel Curved and Bent 6 x 3
Technic Panel Curved and Bent 6 x 3
Part #: 24116 Color: Trans-Clear Category: 40
Plate 1 x 3
Plate 1 x 3
Part #: 3623 Color: Red Category: 14
Technic Axle 6
Technic Axle 6
Part #: 3706 Color: Red Category: 46
Plate 1 x 4
Plate 1 x 4
Part #: 3710 Color: Yellow Category: 14
Technic Bush
Technic Bush
Part #: 3713 Color: Light Bluish Gray Category: 54
Technic Gear 12 Tooth Bevel
Technic Gear 12 Tooth Bevel
Part #: 6589 Color: Tan Category: 52
Technic Beam 1 x 9 Thick
Technic Beam 1 x 9 Thick
Part #: 40490 Color: White Category: 51
Technic Turntable Large Type 3 Base
Technic Turntable Large Type 3 Base
Part #: 18939 Color: Light Bluish Gray Category: 52
Technic Turntable Large Type 3 Top, 60 Tooth
Technic Turntable Large Type 3 Top, 60 Tooth
Part #: 18938 Color: Black Category: 52
Technic Pin Connector Round 1L [Beam]
Technic Pin Connector Round 1L [Beam]
Part #: 18654 Color: Light Bluish Gray Category: 12
Technic Axle 7
Technic Axle 7
Part #: 44294 Color: Yellow Category: 46
Hinge Plate 1 x 2 Locking with 1 Finger on Side, without Groove
Hinge Plate 1 x 2 Locking with 1 Finger on Side, without Groove
Part #: 44567b Color: Black Category: 18
Technic Pin Connector Round 1L [Beam]
Technic Pin Connector Round 1L [Beam]
Part #: 18654 Color: Black Category: 12
Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening]
Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening]
Part #: 18575 Color: Tan Category: 52
Brick Special 1 x 1 with Studs on 2 Sides
Brick Special 1 x 1 with Studs on 2 Sides
Part #: 47905 Color: Red Category: 5
Slope 30° 1 x 1 x 2/3 (Cheese Slope)
Slope 30° 1 x 1 x 2/3 (Cheese Slope)
Part #: 54200 Color: Black Category: 3
Hinge Cylinder 1 x 2 Locking with 2 Click Fingers and Axle Hole, 7 Teeth
Hinge Cylinder 1 x 2 Locking with 2 Click Fingers and Axle Hole, 7 Teeth
Part #: 57360 Color: Black Category: 18
Light Cover 1 x 1 Round with Internal Bar / Bionicle Barraki Eye
Light Cover 1 x 1 Round with Internal Bar / Bionicle Barraki Eye
Part #: 58176 Color: Trans-Orange Category: 32
Technic Axle 5.5 with Stop [Rounded Short End]
Technic Axle 5.5 with Stop [Rounded Short End]
Part #: 59426 Color: Dark Bluish Gray Category: 46

Charts Inventory Statistics

104
Unique Parts
564
Total Pieces
0
Minifigures
Inventory Version: 2

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