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Hi Kevin, Glad to oblige. My 2002 Wicks Aircraft Supply Catalog contains tables (presumably from the spec.) for MIL-H-8794 Aeroquip or Stratoflex hoses which that the hose a "Tube Size" of 1/4" is .188 I.D. and .516 O.D., their Pt. No. 303-4H. The hose that is actually .25 (1/4") I.D. is indicated as being for a 5/16" tube is Pt. No. 303-5H. The 3/8" "Tube Size" is actually .313 I.D. and .672 O.D, Pt. No. 303-6H. The table for Stratoflex MIL-H-83797 hose similarly indicates that for a 1/4" "Tube Size", the actual hose I.D. is 7/32", and for 3/8" I.D. is 11/32". Interestingly, the data for the MIL-H-27267 Teflon hose with exterior stainless braid shows a "Tube Size" of 5/16" and an I.D. of 3/16" for Pt. No. 666-4, and a "Tube Size" of 15/32" and an I.D. of 5/16" for Pt. No. 666-6. For MIL-H-6000 hose no "Tube Size" is shown, hose I.D. 1/4" being indicated for Pt. No. MIL-H-6000-1/4 and 3/8" for Pt. No. MIL-H-6000-3/8. They did not list 303 hose or 306 hose.
