ISO 8434-1 Connectors shall be designated by an alphanumeric code to facilitate ordering.
They shall be designated by the word “Connector” followed by ISO 8434-1, followed by a spaced hyphen, then the connector style letter symbols, followed by a spaced hyphen, then the series letter(s), immediately followed by the outside diameter of the tube with which they are to be connected.
For weld nipples, a multiplication sign (×) shall then follow, then the tube wall thickness.
There shall be no spaces on either side of the multiplication symbol. For stud ends (connector ends), a multiplication symbol followed by the thread designation of the stud end, followed by a spaced hyphen and the sealing type shall be added.
The letter symbol designation of the connector style shall have three parts: the connection end type, immediately followed by the shape of the connector and by the indication that a complete connector is ordered.
Connection end type Symbol
Bulkhead BH
Swivel with O-ring SWO
Weld-on/weld-in WD
Stud SD
Reducer RD
Shape Symbol
Straight S
Elbow E
45° elbow E45
Tee T
Run tee RT
Branch tee BT
Cross K
Component type Symbol
Nut N
Cutting ring CR
Locknut LN
Nipple NP
Plug PL
Completeness indication Symbol
Complete connector C
Stud end sealing types Symbol
Metal-to-metal sealing B
Elastomeric sealing E
O-ring sealing F
EXAMPLE 1 A stud straight connector, including O-ring without cutting ring and nut, with a heavy-duty stud connection end having an M18 × 1,5 thread in accordance with ISO 6149-2, to be connected to a 12 mm OD tube, is designated for ordering as follows: Connector ISO 8434-1 - SDS - S12×M18 - F