Acronym   Notes
AEM Ethylene Acrylate Rubber Hose material resistant to oil, heat and ozone
AN Army-Navy Army & Navy standard for pipe fittings, similar to JIC
AR Aramid Heat resistant fibre used as a reinforcement for hoses
BAR Metric unit of pressure, 1 bar = approx 14.7psi
BSP British Standard Pipe British standard for pipe threads
BSW British Standard Whitworth Archaic British imperial unit based screw thread standard.
CM Chloropolyethylene Abrasion resistant outer layer for hoses.
CO Cotton Used as a reinforcement
CR Chloroprene Rubber Hose material also known as Neoprene.
CSM Chlorosulfonated Polyethylene Abrasion resistant outer layer for hoses.
D Diameter
DIN Deutsches Institut für Normung German standards institute
DN Data Norm Cohline’s way of demonstrating interchangeability of hoses and fittings
ECO Epichlorohydrin Copolymer Rubber Similar to NBR but with better heat, oil and petrol resistance.
EPDM Ethylene Propylene Diene Monomer Hose material suited to coolant, brake & clutch fluid and NOT Fuels.
FPM Fluoroelastomer Hose material, used for fuel lines also known as Viton or FKM
HIPHL Used to denote extra properties of PA tube in this case plasticised, heat and light stabilised.
HNBR Hydrogenated Nitrile Butadiene Rubber Like NBR but with superior resistance to oil, gas and steam
ID Inside Diameter
JIC Joint Industry Council Pipe fittings using a 37° sealing surface similar to AN.
L Length
NBR Nitrile Butadiene Rubber Oil resistant rubber used for fuel etc.
NPT National Pipe Taper American standard for pipe fittings.
NPTF National Pipe Taper Fuel American standard for fuel pipe fittings.
NW Nenn Weite (Nominal Width) A measurement not using a conventional scale.
OD Outside Diameter The measurement across the outside of a cylindrical object.
PA Polyamide Rigid plastic used for hoses also known as Nylon.
PSI Pounds per Square Inch Imperial unit of pressure.
PVC Polyvinyl Chloride Hose material
RME Rapeseed Methyl Ester Bio diesel
SW Schlüsselweite (Spanner Width) Measurement across the flat sides of a nut, bolt head etc, spanner jaw size