'close-knit ties' is correct and usable in written English.
You can use it when referring to strong bonds, relationships, or friendships. For example, "The close-knit ties between the members of the extended family were impressive to observe."
Looking back on photo albums, we see close-knit ties of family and friends; we see grandparents, no longer here, filled with great pride.
The weight of the French delegation that flew from Paris to Libreville for the funeral on June 16th of Omar Bongo Ondimba, Africa's longest-serving leader and object of a big corruption case in France, reflects the close-knit ties the country has kept with leaders of former African colonies, however unsavoury.
It is these close-knit ties of people who may not have any kind of connection to al-Qaeda that make Yemen a completely different battlefield to Afghanistan or Pakistan.
The social networks span from close knit ties between neighbours and extended family to more organised community groups and right up to partnerships between community groups and externally-resourced organisations, such as NGOs and local government departments.
Second, the old close-knit family and community ties that once supported child-rearing have been severed by industrialization and urbanization, and not much has emerged to take their place.
Still, the case has some members of Vancouver's close-knit Bikram yoga community reconsidering their ties to the yoga guru.
The move to secure the A.I.G. documents for all parties is related to the close-knit nature of the entities, which had close ties until recently.
A close-knit minority within the Sunni minority, they exploited ties of region, clan and family to seize control of the army, then the state.
A close-knit brotherhood — it's nearly all male — that shares school ties, board memberships and rituals like hunting and wine-tasting, the French business elite is a surprisingly small coterie in a nation of more than 60 million people.
A close-knit summer colony.
