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DIN 3865 standard pdf specifies nipple 24 degree cone with o-ring connection, for compression tube fittings according to DIN EN ISO 8434-1 and ISO 8434-4, and ISO 12151 part 2 and DIN 20078-8, DIN 20078-9 hose fittings, it is used with metric female nuts, one is tube union nut(DIN 3870 compression nut), another one is steel wire-through nut also called “DKO Swivel”.
DIN 3865 Dimensions and designation
Fittings, nuts as per DIN EN ISO 8434-1 standards, interface at manufacturer’s discretion
Type A design with Weld-on Nipple
Type B design for use with hose fittings and swivel adapters.
Dimensions of DIN 3865 fittings
Material
For type A, 24 degree cone weld-on nipple should be weldable steel, for type B, 24 degree compression tube fittings should be C35 or C45 steel. O-ring shall be made of NBR with 90 IRHD, other materials being the subject of agreement.
Usage
The 24° sealing cones with O-ring listed in this standard are used for connection to
a) L and S series cutting ring connection according to DIN EN ISO 8434-1 and ISO 8434-4, Our Part No series of 2C, 2C9, CC, BC, 3C etc.
b) Corresponding hose fittings form D (series L) according to DIN 20078-4 or form E (series S) according to DIN 20078-5, Our part No series of 20511 20411 20591
For hose fittings with sealing cone form B, the requirements, assembly instructions and test specified in DIN 20078-1, the dimensions in DIN 20078-8 (L series) or DIN 20078-9 (S series).
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