# Pololu Ball Caster with 3/8" Metal Ball **Type:** Product page · **SKU:** POLOLU-951 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia) **Page:** https://core-electronics.com.au/pololu-ball-caster-with-3-8-metal-ball.html ([markdown](https://core-electronics.com.au/pololu-ball-caster-with-3-8-metal-ball.html.md)) This small ball caster uses a 3/8" diameter metal ball. The height of the assembled kit ranges from 0.4" to 0.6". ## Pricing - **Price:** $5.30 (inc GST) — $4.82 AUD, exc GST - **Quantity discounts:** 10+ $4.63 (exc GST) · 25+ $4.48 (exc GST) ## Availability & dispatch - In stock, ships same business day if ordered before 2PM (Australia/Sydney). - We can dispatch 4 today, and up to 500 more in 4–7 days. ## Description | [![](https://core-electronics.com.au/attachments/localcontent/0J9813_9356b4aacb.jpg)](https://core-electronics.com.au/attachments/localcontent/0J9813_7392413c21f.jpg) | |---| | Pololu ball caster with 3/8" metal ball with included hardware. | This ball caster kit includes a black ABS housing, a 3/8" diameter metal ball, two spacers (1/16" and 1/8" thick), and two [7/16" #2 screws](https://core-electronics.com.au/machine-screw-2-56-7-16-length-phillips-25-pack.html) and [nuts](https://core-electronics.com.au/machine-hex-nut-2-56-25-pack.html). The total height of the ball caster, 0.4", can be increased to about 0.6" using the included spacers. The two included #2 screws can be used to mount the ball caster to your chassis, or you can use your own #2 or M2 screws if your application requires a different length. Note that Pololu's ball casters are designed for small robots; they are not intended to bear more than a few pounds. With more weight than this, friction between the ball and the housing will generally keep it from rolling well. For detailed dimensions, see the dimension diagram (164k pdf). **Comparison of Pololu ball casters** | [![](https://core-electronics.com.au/attachments/localcontent/0J6616_206725e12f0.jpg)](https://core-electronics.com.au/attachments/localcontent/0J6616_15804c1ec4a.jpg) | |---| | Pololu ball casters with plastic and metal balls. Ball diameter from left to right: 1", 3/4", 1/2", and 3/8". | | Pololu ball caster ball diameter | height with no spacers | distance between screw holes | weight with no spacers or screws | |---|---|---|---| | [3/8" plastic ball](https://core-electronics.com.au/pololu-ball-caster-with-3-8-plastic-ball.html) | 0.40" | 0.53" | 0.03 oz | | [3/8" metal ball](https://core-electronics.com.au/pololu-ball-caster-with-3-8-metal-ball.html) | 0.40" | 0.53" | 0.14 oz | | [1/2" plastic ball](https://core-electronics.com.au/pololu-ball-caster-with-1-2-plastic-ball.html) | 0.53" | 0.58" | 0.07 oz | | [1/2" metal ball](https://core-electronics.com.au/pololu-ball-caster-with-1-2-metal-ball.html) | 0.53" | 0.58" | 0.32 oz | | [3/4" plastic ball](https://core-electronics.com.au/pololu-ball-caster-with-3-4-plastic-ball.html) | 0.88" | 0.24" | 0.25 oz | | [3/4" metal ball](https://core-electronics.com.au/pololu-ball-caster-with-3-4-metal-ball.html) | 0.82" | 0.61" | 1.05 oz | | [1" plastic ball, ball bearings](https://core-electronics.com.au/pololu-ball-caster-with-1-plastic-ball-and-plastic-rollers-46014.html) | 1.10" | 0.48" | 0.65 oz | | [1" plastic ball, plastic rollers](https://core-electronics.com.au/pololu-ball-caster-with-1-plastic-ball-and-plastic-rollers.html) | 1.10" | 0.48" | 0.58 oz | | [1" plastic ball (old version)](https://core-electronics.com.au/pololu-ball-caster-with-1-plastic-ball.html) | 1.10" | 0.70" | 0.36 oz | **People often buy this product together with:** | [![Pololu Ball Caster with 3/8](https://core-electronics.com.au/attachments/localcontent/0J9801_23343c330c.jpg)](https://core-electronics.com.au/pololu-ball-caster-with-3-8-plastic-ball.html) | [Pololu Ball Caster with 3/8" Plastic Ball](https://core-electronics.com.au/pololu-ball-caster-with-3-8-plastic-ball.html) | |---|---| | [![QTR-8A Reflectance Sensor Array](https://core-electronics.com.au/attachments/localcontent/0J615_3227af1af2.jpg)](https://core-electronics.com.au/qtr-8a-reflectance-sensor-array.html) | [QTR-8A Reflectance Sensor Array](https://core-electronics.com.au/qtr-8a-reflectance-sensor-array.html) | |---|---| | [![Pololu Micro Metal Gearmotor Bracket Pair - Black](https://core-electronics.com.au/attachments/localcontent/0J1128_293715d398.jpg)](https://core-electronics.com.au/pololu-micro-metal-gearmotor-bracket-pair-black.html) | [Pololu Micro Metal Gearmotor Bracket Pair - Black](https://core-electronics.com.au/pololu-micro-metal-gearmotor-bracket-pair-black.html) | |---|---| **Dimensions** | Ball diameter: | 0.375 in | |---|---| | Weight: | 4 g[1](https://core-electronics.com.au/#note1) | **General specifications** | Ball material: | metal | |---|---| **Notes:** 1Without screws or spacers. **File downloads** - **Dimension diagram of the Pololu Ball Caster with 3/8" Ball (164k pdf)** - **3D model of the Pololu Ball Caster with 3/8" Ball (2MB step)** ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/p/o/pololu_ball_caster_with_3_8_inch_metal_ball__pololu_951__00.jpg)