DIN 7644 is for Compression couplings with spherical liner; male studed banjo bolts for ring type nipples
DIN 7644 standard is included in DIN Handbook 348. Applies to male studded banjo bolts which are used in conjunction with compression couplings with spherical liner as specified in DIN 3863 and ring type nipples as specified in DIN 7642 Part 1 (at present at the stage of draft).
Hydraulic banjo fittings size chart as follow:
Standard references:
DIN 7601 : 1998 COMPRESSION COUPLINGS WITH BALL-TYPE NIPPLES - COMPLETE UNIONS AND SURVEY
DIN 7642 : 1997 COMPRESSION COUPLINGS - RING TYPE NIPPLES FOR BRAZED CONNECTION
DIN 3850 : 1998 COMPRESSION FITTINGS - SUMMARY
DIN HDBK 348 : 3ED 2015
