Is there an industry standard on size for the loose balls in cup and cone hubs?

Not sure if it’s universal, but the size is on here:

https://www.parktool.com/blog/repair-help/hub-overhaul-and-adjustment

It’s in section 5. I did have to buy some recently, I think for the my rear wheel after I lost a couple in the hub shell 🙄

I may have some knocking about if it’s rear ones you need.

Cheers @malv173. Have an engineering place locally that should have them. Feeling a bit rough after the constant crappy weather riding and figure after 2 years of service they’re probably due replacing anyway. Any recommendations on grease?

Juice lubes white grease is our choice for the bike fleet. Lasts and lasts.