Foresters Friendly Society has entered an agreement with CS Healthcare, a specialist health insurance provider.
The agreement marks the first ever occasion on which two UK friendly societies have come together to offer each others' members direct access to their products and services.
Foresters Friendly Society members between 18 and 75 years old will be offered CS Healthcare's private health insurance product, Your Choice, normally only for civil servants, public sector or not-for-profit organisations.
CS Healthcare policyholders will be offered Foresters Friendly Society 50+ Life Plan.
Neil Armitage, marketing director, Foresters Friendly Society, said: "As consumer trust in the banking sector continues to erode, now is the ideal time for mutual organisations to be pooling their resources, sharing ideas and working to ensure they offer a sum greater than their parts to offer their members greater choice without compromising their traditional values."
Russell Stephens, director of marketing, distribution and membership services at CS Healthcare, added that he hoped this was the first of many mutuals working together.