House Brand Replacement Turntable Main Bearing Ball
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Family-Owned Authorized Dealer
Family-Owned Authorized Dealer
We're an authorized dealer for every brand listed on this site, so your warranty is valid and fully supported. We're a real brick-and-mortar shop in Chestertown, MD with shelves of actual inventory, not a drop-shipper. Family-owned and run for three generations, since 1978.
Delivery and Shipping
Delivery and Shipping
Free shipping for most items over $100! Local delivery up to 500 miles more with minimum qualifying purchase.
See our shipping policies for details. We will contact you after your order.
House Brand Replacement Turntable Main Bearing Ball
A replacement main bearing ball in multiple sizes and two grades: high-tolerance chrome or extremely-high-tolerance silicon nitride ceramic. These are The Listening Room's own aftermarket spare, not a factory fitted part for any particular turntable.
3/16th of an Inch
Common size for many US made tables and a common fitment for Rega and Pro-Ject turntables. 3/16th inch balls are more widely available than 5mm balls and come in higher tolerance grades at a lower price.
Our 3/16th chrome balls have a sphericity of .000010 inch.
Our 3/16th ceramic balls have a sphericity of .000003 inch and are made of trisilicon tetranitride (silicon nitride) which resists chipping and cracking much better than cheaper ceramics.
7/32nd of an Inch
Common size for Michell Turntables built after 1985. Used for both the main bearing and suspension columns.
Our 7/32nd chrome balls have a sphericity of .000010 inch.
Our 7/32nd ceramic balls have a sphericity of .000003 inch and are made of trisilicon tetranitride (silicon nitride) which resists chipping and cracking much better than cheaper ceramics.
5mm
Factory size Gold Note turntables. Pricier than their non-metric siblings but the true proper fit.
Our 5mm chrome balls have a sphericity of .000010 inch.
Our 5mm ceramic balls have a sphericity of .000005 inch and are made of trisilicon tetranitride (silicon nitride) which resists chipping and cracking much better than cheaper ceramics.
House Brand Main Bearing Ball Specifications
| Specification | Detail |
|---|---|
| Sizes | 3/16 inch (4.76mm), 7/32 inch (5.56mm), 5mm |
| Materials | Chrome, or ceramic (silicon nitride, Si3N4) |
| Chrome sphericity | .000010 inch (all sizes) |
| Ceramic sphericity | .000003 inch (3/16 and 7/32 inch), .000005 inch (5mm) |
| 3/16 inch fitment | Rega, Pro-Ject and many US made turntables |
| 7/32 inch fitment | Michell turntables built after 1985 (main bearing and suspension columns) |
| 5mm fitment | Gold Note turntables (factory size) |
| Quantity | One ball |
