The importance of selecting or replacing hydraulic hoses and couplings ... has an inside diameter of 4/16” or ¼”. 100R5 and 100R14 hoses are exceptions. They ... Hose ID: Size affects fluid ...

SAE Standard J517 provides general, dimensional, and performance specs for the 100R hose series, which are the most common hoses used in hydraulic systems. Here’s an overview of SAE specifications.

S = Hose size: This is the inside diameter of the hose. The correct size will keep pressure loss to a minimum and avoid hose damage during heat generation or excessive turbulence.