DIN 3900 is for Compression couplings (LL series) with tapered stud end.
DIN 3900 determines the design and dimensions of extra-light duty series (LL) compression couplings with tapered stud end and with type W port as in DIN 3861, rated for nominal pressures up to 100 bar, for use in compression coupling assemblies.
LL series compression couplings are often used in central lubrication system tube fittings.
Standard references as follows:
DIN 3861 : 2016 NON-SOLDERING COMPRESSION FITTINGS - COMPRESSION RINGS - DESIGN
DIN 3859-1 E : 2005 COMPRESSION COUPLINGS - PART 1: TECHNICAL DELIVERY CONDITIONS
DIN 3858 E : 2005 WHITWORTH PIPE THREADS FOR PIPE COUPLINGS - PARALLEL INTERNAL THREADS AND TAPER EXTERNAL THREADS - DIMENSIONS
DIN 3901 E : 2001 NON-SOLDERING COMPRESSION FITTINGS WITH CUTTING RING - DOUBLE ENDED STUD ENDS WITH PARALLEL THREAD FOR STUB ENDS TYPE A
DIN 3852-1 E : 2014 STUD ENDS AND PORTS OF FITTINGS, VALVES AND PLUG SCREWS - PART 1: DIMENSIONS FOR METRIC FINE PITCH THREAD
DIN 3852-2 E : 2014 STUD ENDS AND PORTS OF FITTINGS, VALVES AND PLUG SCREWS - PART 2: DIMENSIONS FOR PIPE THREAD
DIN EN ISO 4042 E : 2001 FASTENERS - ELECTROPLATED COATINGS
DIN 3853 E : 2001 NON-SOLDERING AND SOLDERING COMPRESSION FITTINGS - STUD ENDS FOR USE WITH UNION NUT; DESIGN SHEET
DIN 158-1 E : 1997 METRIC TAPER EXTERNAL AND MATING PARALLEL INTERNAL SCREW THREADS - PART 1: DIMENSIONS, TOLERANCES AND INSPECTION
