Setobrick

LEGO part 3668: Brick Special 2 x 6 x 1 1/3 with Axle Holes and 2 x 4 Recessed, Ridges at Underside

Bricks Special2 colours72 sets

LEGO part LEGO part 3668: Brick Special 2 x 6 x 1 1/3 with Axle Holes and 2 x 4 Recessed, Ridges at Underside

Specifications

Reference3668
CategoryBricks Special
MaterialABS plastic
Colours2
Sets72
Listed pieces139
First appearance2023
Latest appearance2026
Element (Dark Bluish Gray)6454959
Most common colourDark Bluish Gray
SetopediaData: Rebrickable
Spec sheet updated on 2026-09-29

LEGO part 3668, Brick Special 2 x 6 x 1 1/3 with Axle Holes and 2 x 4 Recessed, Ridges at Underside, belongs to the Bricks Special category. It exists in 2 colours and appears in 72 sets of our database, from 2023 to 2026, for a total of 139 listed pieces. Its most common colour is Dark Bluish Gray.

Number 3668 identifies the shape and is moulded under the part. Each colour also has its own element ID, the one Pick a Brick uses: in dark bluish gray, it is 6454959.

Part 3668 through the years

The oldest set in our database that contains part 3668 is 10318 Concorde, released in 2023 in the Icons theme. It is still in use: the most recent set featuring it, 75426 Millennium Falcon, dates from 2026.

Its peak year is 2025, with 25 sets containing it. The set with the most copies is 72044 Mario Kart : Piranha Plant Power-Up Pursuit: 5 copies, against an average of 1.9 per set.

It is spread across several themes, led by Speed Champions (38%), City (17%) and Super Mario (10%). With 72 sets, it ranks no. 1,351 of 2,731 parts in our database and no. 48 of 71 in the Bricks Special category.

Sets containing part 3668, by period

PeriodSets
202314
202415
202525
202618

Colours of part 3668

Even its least common colour, black, can be found in 2 sets.

Colour (element ID)SetsPiecesExample sets
Dark Bluish Gray645495971136103187692376921
Black6612905236050977264

Where to buy part 3668

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

Search part 3668 on AmazonPick a Brick (lego.com)BrickLink entryRebrickable entry

Sets that include part 3668

Sets ranked by popularity that include at least one part 3668, in any colour.

Related parts

Often found with part 3668

Parts that share the most sets with part 3668, based on set inventories.

More parts in the Bricks Special category

All parts in the Bricks Special category

Frequently asked questions

How many LEGO sets include part 3668?

Part 3668 (Brick Special 2 x 6 x 1 1/3 with Axle Holes and 2 x 4 Recessed, Ridges at Underside) appears in 72 sets listed on Setopedia, from 2023 to 2026, in any colour.

Which LEGO set contains the most copies of part 3668?

Set 72044 Mario Kart : Piranha Plant Power-Up Pursuit, released in 2025, contains 5 copies, the highest count in our database. On average, a set containing part 3668 has 1.9.

Which colours does LEGO part 3668 come in?

2 colours are listed for part 3668. The most common is Dark Bluish Gray, found in 71 sets.

What is the rarest colour of part 3668?

According to our inventories, it is black, found in only 2 sets (60509 Harbor Freight Train with Crane & Truck, 77264 Jaguar Project 7 & Land Rover Defender).

What is the element ID of part 3668 in dark bluish gray?

In dark bluish gray, part 3668 has element ID 6454959. Number 3668 is the mould number, the same for every colour.

Is LEGO part 3668 still used in recent sets?

Yes: it appears in sets released in 2026, such as 75426 Millennium Falcon.

Where can I buy LEGO part 3668 individually?

Single parts 3668 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.