A bitter feud has erupted in a ritzy beachside suburb after a customer complained to the owner of a cheese company about finding a metal bolt in her purchase.

Julia Sakr said she had bought a block of Maffra Cheese at her local supermarket, the Fruitlologist in Bondi, in Sydney's eastern suburbs.

'I had a hankering for cheddar cheese and crackers and I saw this gourmet piece of cheese,' the pregnant mother said in a TikTok video shared on Saturday.

Ms Sakr said when she arrived home she opened the cheese and discovered a small metal nut inside of it.

'I broke up the top piece, and I saw on the backside of it a bolt. Like a metal bolt, you know, like a tool,' she said.