# Ball caster 3/8 inch metal ball

Manufacturer: Pololu  |  MPN: 951  |  Category: caster
Canonical: https://partsgraph.ai/catalog/parts/pololu-ball-caster-38
Image: https://partsgraph.ai/catalog/img/pololu-ball-caster-38.jpg (photo: Pololu; sha256 5dc785c3c083)

## Attributes (each with provenance)

- **Ball diameter**: 3/8
  - source: https://www.pololu.com/product/951
  - quote: "Pololu Ball Caster with 3/8″ Metal Ball Mechanical Components » Ball Casters &raq"
- **Assembled height (with spacers)**: 0.4 to 0.6 ″
  - source: https://www.pololu.com/product/951
  - quote: "ter metal ball. The height of the assembled kit ranges from 0.4″ to 0.6″, depending on the combination of included spacers used. Alt"
- **Height (no spacers)**: 0.4 ″
  - source: https://www.pololu.com/product/951
  - quote: "″ #2 screws and nuts . The total height of the ball caster, 0.4″, can be increased to about 0.6″ using the included spacers."
- **Housing material**: ABS
  - source: https://www.pololu.com/product/951
  - quote: "ed hardware. Overview This ball caster kit includes a black ABS housing, a 3/8″ diameter metal ball, two spacers (1/16″ and"
- **Ball material**: metal ball
  - source: https://www.pololu.com/product/951
  - quote: "Pololu Ball Caster with 3/8″ Metal Ball Mechanical Components » Ball Casters » Pololu B"
- **Mounting screw size**: #2
  - source: https://www.pololu.com/product/951
  - quote: "tal ball, two spacers (1/16″ and 1/8″ thick), and two 7/16″ #2 screws and nuts . The total height of the ball caster, 0.4″"
- **Weight (no spacers or screws)**: 0.14 oz
  - source: https://www.pololu.com/product/951
  - quote: "lastic ball 0.40″ 0.53″ 0.03 oz 3/8″ metal ball 0.40″ 0.53″ 0.14 oz 1/2″ plastic ball 0.53″ 0.58″ 0.07 oz 1/2″ metal ball 0.53″"
- **Distance between screw holes**: 0.53 ″
  - source: https://www.pololu.com/product/951
  - quote: "es weight with no spacers or screws 3/8″ plastic ball 0.40″ 0.53″ 0.03 oz 3/8″ metal ball 0.40″ 0.53″ 0.14 oz 1/2″ plastic ba"

## Vendors

- Pololu: https://www.pololu.com/product/951 (~USD 2.95, indicative as of 2026-08-18)

## Datasheets

- Ball caster product page: https://www.pololu.com/product/951

Used in builds: 2wd-robot (roles: caster)

Machine feed of the whole catalogue: https://partsgraph.ai/catalog/feed.json