LONDON — Fears of a Chinese takeover of companies important to national security have felled deals around the world both big and small. Now even the sale of a minor airplane parts maker is being closely examined for serious risks.

In delaying the proposed takeover of the parts maker, Northern Aerospace, by a rival owned by a Chinese conglomerate, British government officials appear worried that even a small supplier to Airbus and Boeing could have important national security implications.

It is the latest instance of countries around the world showing skepticism about Chinese money. Lawmakers in Washington are battling with President Trump over whether to lift penalties on ZTE, a Chinese telecommunications company whose phones were barred for sale on American military bases. And in Australia, lawmakers are considering whether to block Huawei, China’s biggest telecom company, from contracts to upgrade that country’s wireless networks to the next-generation 5G standard.

Governments from the United States to Germany worry that China will effectively buy up the technologies it needs to create state-funded Chinese giants that would rival those from America and Europe.