Setobrick

LEGO part 57909a: Technic Brick Special 2 x 2 with Solid Ball and Axle Hole

Technic Special1 colours47 sets

LEGO part LEGO part 57909a: Technic Brick Special 2 x 2 with Solid Ball and Axle Hole

Specifications

Reference57909a
CategoryTechnic Special
MaterialABS plastic
Colours1
Sets47
Listed pieces139
First appearance2007
Latest appearance2013
Most common colourDark Bluish Gray
Main themesNinjago, Exo-Force, Space
SetopediaData: Rebrickable
Spec sheet updated on 2026-09-29

LEGO part 57909a, Technic Brick Special 2 x 2 with Solid Ball and Axle Hole, belongs to the Technic Special category. It exists in 1 colours and appears in 47 sets of our database, from 2007 to 2013, for a total of 139 listed pieces. Its most common colour is Dark Bluish Gray.

Number 57909a is the LEGO mould number, the one embossed under the part or inside the studs. It is the reference used by Rebrickable, BrickLink and the Pick a Brick service to name the shape regardless of colour: each shape and colour combination then gets its own element number.

Part 57909a through the years

The oldest set in our database that contains part 57909a is 7692 MX-71 Recon Dropship, released in 2007 in the Space theme. No set in our database uses it after 2013, the year of 70003 Eris' Eagle Interceptor. To get it today, look for older sets or buy it second-hand.

Its peak year is 2011, with 9 sets containing it. The set with the most copies is 2509 Earth Dragon Defense: 7 copies, against an average of 3 per set.

It is spread across several themes, led by Ninjago (19%), Exo-Force (19%) and Space (13%). With 47 sets, it ranks no. 1,710 of 2,731 parts in our database and no. 24 of 44 in the Technic Special category.

Sets containing part 57909a, by period

PeriodSets
20079
20086
20094
20105
20119
20127
20137

Colours of part 57909a

Part 57909a exists in a single colour: dark bluish gray.

Colour (element ID)SetsPiecesExample sets
Dark Bluish Gray47139952525079450

Where to buy part 57909a

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

Search part 57909a on AmazonPick a Brick (lego.com)BrickLink entryRebrickable entry

Sets that include part 57909a

Sets ranked by popularity that include at least one part 57909a, in any colour.

Related parts

Often found with part 57909a

Parts that share the most sets with part 57909a, based on set inventories.

More parts in the Technic Special category

All parts in the Technic Special category

Frequently asked questions

How many LEGO sets include part 57909a?

Part 57909a (Technic Brick Special 2 x 2 with Solid Ball and Axle Hole) appears in 47 sets listed on Setopedia, from 2007 to 2013, in any colour.

Which LEGO set contains the most copies of part 57909a?

Set 2509 Earth Dragon Defense, released in 2011, contains 7 copies, the highest count in our database. On average, a set containing part 57909a has 3.

Which colours does LEGO part 57909a come in?

1 colours are listed for part 57909a. The most common is Dark Bluish Gray, found in 47 sets.

Is LEGO part 57909a still used in recent sets?

Not in our database: its last set dates from 2013 (70003 Eris' Eagle Interceptor). Look for it in second-hand sets or on BrickLink.

Where can I buy LEGO part 57909a individually?

Single parts 57909a 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.

How do I identify a LEGO part number?

The mould number is embossed under the part or inside the studs. For the Technic Brick Special 2 x 2 with Solid Ball and Axle Hole, it is number 57909a, shared by all its colours.