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LEGO part 2851: Technic Engine Piston Round

Technic Steering, Suspension and Engine7 colours118 sets

LEGO part LEGO part 2851: Technic Engine Piston Round

Specifications

Reference2851
CategoryTechnic Steering, Suspension and Engine
MaterialABS plastic
Colours7
Sets118
Listed pieces630
First appearance1995
Latest appearance2026
Element (Yellow)4112203 · 285124
Most common colourYellow
Main themesTechnic, Racers, Icons
SetopediaData: Rebrickable
Spec sheet updated on 2026-09-29

LEGO part 2851, Technic Engine Piston Round, belongs to the Technic Steering, Suspension and Engine category. It exists in 7 colours and appears in 118 sets of our database, from 1995 to 2026, for a total of 630 listed pieces. Its most common colour is Yellow.

Number 2851 identifies the shape and is moulded under the part. Each colour also has its own element ID, the one Pick a Brick uses: in yellow, it is 4112203.

Part 2851 through the years

The oldest set in our database that contains part 2851 is 8440 Formula Flash, released in 1995 in the Technic theme. It is still in use: the most recent set featuring it, 42232 Koenigsegg Sadair's Spear Megacar, dates from 2026.

Its peak year is 2015, with 7 sets containing it. The set with the most copies is 8457 Power Puller: 20 copies, against an average of 5.3 per set.

The part is closely tied to the Technic theme: 93% of the sets that contain it belong to it. With 118 sets, it ranks no. 1,018 of 2,731 parts in our database and no. 7 of 32 in the Technic Steering, Suspension and Engine category.

Sets containing part 2851, by period

PeriodSets
1995-199917
2000-200932
2010-201942
2020-202627

Colours of part 2851

4 colours appear in only one set: dark bluish gray (8439 Front End Loader), rust (8437 Future Car), red (8414 Mountain Rambler) and dark turquoise (3057 Create 'n' Race - Master Builders).

Colour (element ID)SetsPiecesExample sets
Yellow4112203 · 285124104571421434215642127
Dark Gray4160859 · 285127828844084228459
Blue4182882 · 4161902218846110077
Dark Bluish Gray4251456168439
Rust148437
Red4107748128414
Dark Turquoise4141807113057

Where to buy part 2851

Setopedia shows no prices: they vary by colour, condition and seller. Amazon links are affiliate links.

Search part 2851 on AmazonPick a Brick (lego.com)BrickLink entryRebrickable entry

Sets that include part 2851

Sets ranked by popularity that include at least one part 2851, in any colour.

Related parts

Often found with part 2851

Parts that share the most sets with part 2851, based on set inventories.

More parts in the Technic Steering, Suspension and Engine category

All parts in the Technic Steering, Suspension and Engine category

Frequently asked questions

How many LEGO sets include part 2851?

Part 2851 (Technic Engine Piston Round) appears in 118 sets listed on Setopedia, from 1995 to 2026, in any colour.

Which LEGO set contains the most copies of part 2851?

Set 8457 Power Puller, released in 2000, contains 20 copies, the highest count in our database. On average, a set containing part 2851 has 5.3.

Which colours does LEGO part 2851 come in?

7 colours are listed for part 2851. The most common is Yellow, found in 104 sets.

What is the rarest colour of part 2851?

According to our inventories, it is dark turquoise, found in only 1 set (3057 Create 'n' Race - Master Builders).

What is the element ID of part 2851 in yellow?

In yellow, part 2851 has element ID 4112203 or 285124. Number 2851 is the mould number, the same for every colour.

Is LEGO part 2851 still used in recent sets?

Yes: it appears in sets released in 2026, such as 42232 Koenigsegg Sadair's Spear Megacar.

Where can I buy LEGO part 2851 individually?

Single parts 2851 can be ordered on Pick a Brick (lego.com) in colours currently produced, or on BrickLink for older colours. The part is also included in the sets listed on this page.