# goBILDA 12 mm Linear Ball Bearing 57 mm (2-pack)

> goBILDA 1612-1221-0057 linear ball bearing, 2-pack: runs on 12 mm shafting, 21 mm outer diameter, 57 mm long (43 mm between the 1.2 mm retaining grooves), high-carbon steel housing and balls, plastic cage, rubber seals, 50 g each. The long version of the 30 mm bearing for stiffer, heavier linear axes; no load ratings are published.

- Manufacturer: goBILDA
- Part number: 1612-1221-0057
- Category: Bearings
- Canonical page: https://www.xirkit.io/products/gobilda-12-mm-linear-ball-bearing-57-mm-2-pack-3112
- Structured JSON: https://www.xirkit.io/products/gobilda-12-mm-linear-ball-bearing-57-mm-2-pack-3112/data.json
- Source: Xirkit structured parts catalog — every value traced to a cited document; unknowns are explicit.

## Key specifications

| Property | Value |
| --- | --- |
| Bearing type | linear ball |
| Bore (ID) | 12 mm |
| Outer diameter | 21 mm |
| Width | 57 mm |
| Seal | 2RS |
| Material | High-Carbon Steel Housing and Balls, Plastic Cage, Rubber Seals |
| Pack quantity | 2 |
| Weight | 50 g |
| Dimensions | 21 × 21 × 57 mm |

## Where to buy

| Supplier | Price | Stock | Checked | URL |
| --- | --- | --- | --- | --- |
| www.gobilda.com | 8.99 USD | in_stock | 2026-10-01 | https://www.gobilda.com/12mm-id-linear-ball-bearing-21mm-od-57mm-length-2-pack/ |

## FAQ

**How much does the goBILDA 12 mm Linear Ball Bearing 57 mm cost?**

From $8.99 at www.gobilda.com. Prices are observed unit prices before tax and shipping.

**What are the goBILDA 12 mm Linear Ball Bearing 57 mm dimensions?**

21 × 21 × 57 mm. A STEP model is available for enclosure fit checks.

**Where does this goBILDA 12 mm Linear Ball Bearing 57 mm data come from?**

Every value in this record is traced to a source — 2 documents including the board and chip datasheets — with the page and table cited per value. Unknowns are left explicit, never guessed.

## Sources

- [goBILDA 12 mm Linear Ball Bearing 57 mm (2-pack) datasheet](https://www.gobilda.com/12mm-id-linear-ball-bearing-21mm-od-57mm-length-2-pack/)
- [www.gobilda.com listing](https://www.gobilda.com/12mm-id-linear-ball-bearing-21mm-od-57mm-length-2-pack/)

## Part graph

### Alternatives (by use case)

- [goBILDA 4 mm V-Groove Bearing 10.5 mm OD (2-pack)](https://www.xirkit.io/products/gobilda-4-mm-v-groove-bearing-10-5-mm-od-2-pack-34f6) — Both serve linear motion and lifts — check the trade-offs; $5.99 vs $8.99
- [goBILDA 8 mm Linear Ball Bearing 45 mm (2-pack)](https://www.xirkit.io/products/gobilda-8-mm-linear-ball-bearing-45-mm-2-pack-3603) — Both serve linear motion and lifts — check the trade-offs; $8.99 vs $7.99
- [goBILDA 12 mm Linear Ball Bearing 30 mm (2-pack)](https://www.xirkit.io/products/gobilda-12-mm-linear-ball-bearing-30-mm-2-pack-36ac) — Both serve linear motion and lifts — check the trade-offs; $8.99 vs $5.99
- [goBILDA 6 mm Linear Ball Bearing 35 mm (2-pack)](https://www.xirkit.io/products/gobilda-6-mm-linear-ball-bearing-35-mm-2-pack-a41d) — Both serve linear motion and lifts — check the trade-offs; $8.99 vs $6.99
- [goBILDA 4 mm V-Groove Bearing 13 mm OD (2-pack)](https://www.xirkit.io/products/gobilda-4-mm-v-groove-bearing-13-mm-od-2-pack-abea) — Both serve linear motion and lifts — check the trade-offs; $5.99 vs $8.99