# Ball bearing, W420, universal wheel

> Ball caster universal wheel W420 for robotics, used as a front support wheel on platforms with 2 drive wheels or in 3-wheel configurations where low weight matters. Nylon holder with a 15 mm steel ball, mounted at 2 points 40 mm apart, mounting hole diameter 3.1 mm, total assembly height 20 mm. The ball can be removed for cleaning. Reference 9139.

- Page: https://sigmanortec.ro/en/ball-bearing-w420-universal-wheel
- Price: 5.02 RON
- Availability: In stock; 1-2 zile
- Reference: 9139 · EAN: 5949431768903
- Category: Mechanical components > Wheels
- Package (shipping data): 0.02 kg
- Updated: 2026-09-14
- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Prices: RON, VAT included; prices and stock as of 2026-10-22 01:32 (Europe/Bucharest)

## Description

Universal ball caster wheel for robotics, ideal as a front support for 2-wheel drive platforms and 3-wheel configurations where low weight matters. The nylon support reduces friction and ensures smooth rolling with the 15 mm steel ball, it is simply fixed in two points at 40 mm, and the ball can be easily removed for cleaning and maintenance.
Nylon support with a metal ball (ball caster) used as a unique front wheel for robots with only 2 drive wheels on the back. It is ideal in 3-wheel models that require low weight. The nylon support ensures minimal friction with the steel ball.
The support is attached to the chassis in 2 points.
The steel ball can be removed from the support for cleaning the assembly.
Specifications:
Steel ball diameter: 15mm
Support material: Nylon
Support mounting holes distance: 40mm
Mounting hole diameter: 3.1mm
Total height of the assembly: 20mm