The SAE standards for hose generally call for the hose to be marked with the ID of the hose – so 5/16 hose is nominally 5/16 ID. This is unlike tubing and pipe, where 5/16 is 5/16 OD.
The exception is SAE type 5 hose (I think it is supposed to be marked with the SAE standard 1005 on the layline of the hose). Type 5 hose is called “tubing size” and the ID of the hose is the same as the ID of the same size hydraulic tubing. So 5/16 type 5 hose is a bit under ¼” ID, and something like 7/16” OD. It is hydraulic hose rated at 5000 PSI or so, and is not fuel hose. Type 5 hose was originally created for use in aircraft during WWII, because you would not want to carry around the weight of metal tubing and the extra fluid contained in a larger ID hose – plus hose was a lot easier to inventory and replace than metal tubes on military airplanes being repaired around the world. Fuel hose is basically type 1, IIRC, rated to something like 1000 PSI. Made with an inner tube that is resistant to fuels and most solvents (though not all). The reinforcement is made to allow the hose to be more flexible and have shorter bend radius than hydraulic hoses. It also will work as suction hose, which many types of hydraulic hose will not. Never use anything except fuel hose in fuel system applications. Rick Brass Washington, NC I didn’t stay in a Holiday Inn last night, about 30 years ago I was an engineer for Aeroquip. From: CnC-List [mailto:[email protected]] On Behalf Of Charlie Nelson via CnC-List Sent: Sunday, April 24, 2016 10:44 PM To: [email protected] Cc: [email protected] Subject: Re: Stus-List Diesel fuel lines questions A word of warning--these hoses are notorious for variations between the OD and ID so do not assume that if your hose is marked 5/16" on the outside that the inside diameter (ID) will match your fittings. Depending on your hose source, a 5/16" OD hose could have a variety of IDs--some wall thicknesses are greater than others but this number is often not noted on the outside of the hose. If the hose is going on barbed fittings, some to this can be made up by the hose clamps (double always IMHO). However, a thick-walled 5/16" hose may never go over a 1/4" barb fitting. Charlie Nelson Water Phantom C&C 36 XL/kcb [email protected] <mailto:[email protected]>
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