What is bend radius?
The minimum bend radius represents the smallest diameter that a looped hose can achieve without damage and is measured as the distance to the inside edge of the hose (not the center line) when making a 90-degree bend.
A hydraulic hose is constructed of three layers: core, reinforcement, and cover. Reinforcement layers can be one or two layers of a braided textile or braided steel or four or six spiral layers of wound steel.
Braided steel is typically more flexible and has a tighter bend radius than spiral steel. Higher pressure hoses require there to be more layers of reinforcement which causes the hose to have a larger bend radius.
The number of braids or spirals also affects the bend radius. One layer of braids will not be as flexible as a two-layer braided hose. A four wire spiral wrapped hose will be more flexible than a six wire spiral wrapped hose and have a larger bend radius.
Bend Radius Damage on Hydraulic Hose
If you have this problem, your solution is to replace the hose assembly. You will want to re-route it to increase the bend in accordance with the manufacturer’s suggested bend requirement. Another suggestion is to run the hose straight out of the fitting’s crimped on shell for a distance of at least two times its inside diameter before it begins to bend.
Our hose and fitting technicians have years of experience working with a range of hydraulic hoses and can help your team determine the best options for applications with tight bend radius. Stop by one of our store locations or send us a message to learn more and discuss your hose application.