What are these stress type hose fittings called?

I've searched but can't find what they are called.

I'm hoping they are replaceable without replacing the hoses?

Thanks

Strain relief.

Are you talking about the black flange pieces or the brass fitting on the hose. 

The black flange piece is a Bulk Head strain relief,  like these  http://www.westmarine.com/buy/t-h-marine--bulkhead-hydraulic-hose-strain-relief-kits--P015921091 The brass fittings look like flat faced hydraulic fittings and the hose itself looks like Synflex. 

 

However, one end will have to come off the hose to install the Bulkhead strain relief.  If you have the spare length, most any hydraulic shop can cut one fitting off, slide the strain relief on and crimp a new fitting on.  Probably cost you about $10 per hose to have that done.

 

To have new hoses made with the strain reliefs will be expensive.  The hose will probably run $10 or more per foot, and four new fittings will cost you about $5 each and then they charge a few dollars each to crimp them on.

 

Also, make sure they are the size diameter that fits your hose