> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt # 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. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=POLOLU-951:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart. - **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/POLOLU-951:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.) - **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there. - **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works) - **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt ## 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)