Ball-lock, poppet-valve quick couplings to the ISO 7241 Series A interface, in sizes 6,3 to 51 mm. Maximum operating pressure falls with size, from 315 bar at 6,3 mm to 100 bar at 50 mm.
Prices on request. Contact us for availability and quotations.
An ISO 7241 Series A coupling is the ball-lock, poppet-valve pattern: the female half carries the locking balls and a sliding sleeve, the male half is a stepped probe that lifts the poppet as it enters. ISO 7241 states that Series A is used predominantly in Europe and is preferred worldwide for agricultural and forestry machinery.
Rated pressure is not one number. ISO 7241-1 Table 4 gives the maximum operating pressure by size: 315 bar at 6,3 and 10 mm, 250 bar at 12,5 and 20 mm, 200 bar at 25 and 31,5 mm, 160 bar at 40 mm and 100 bar at 50 mm, with a minimum burst of four times operating throughout. A 315 bar ISO-A coupling is only a 315 bar coupling in the two smallest sizes. In 2023 ISO renamed sizes 20, 40 and 50 to 19, 38 and 51 to align with ISO 4397; the couplings are unchanged.
These couplings are not designed to be connected or disconnected under pressure. ISO 7241-1 Table 5 gives the maximum residual pressure at which a coupling can still be connected by hand, and it falls steeply with size: 10 bar at 6,3 mm, 3,15 bar at 20 mm, 0,5 bar at 50 mm. On large sizes that is why decompression provision is fitted.
Series A, Series B and the ISO 16028 flat-face interface are three separate interfaces that do not mate with one another - there is no adapter, only a purpose-made transition coupling with two halves back to back. State size, interface, port thread and seal material at order.
| Interface Standard | ISO 7241 Series A - ball-lock, poppet-valve interface, used predominantly in Europe and preferred worldwide for agricultural and forestry machinery |
|---|---|
| Sizes | 6,3 / 10 / 12,5 / 19 (formerly 20) / 25 / 31,5 / 38 (40) / 51 (50). ISO 7241:2023 renamed sizes 20, 40 and 50 to 19, 38 and 51 to align with ISO 4397; the couplings are the same |
| Maximum Operating Pressure | Falls with size: 315 bar at 6,3 and 10; 250 bar at 12,5 and 20; 200 bar at 25 and 31,5; 160 bar at 40; 100 bar at 50 |
| Minimum Burst Pressure | Four times the maximum operating pressure at every size - 1260 bar at 6,3 and 10 down to 400 bar at 50 |
| Connection Under Pressure | Not designed to be connected or disconnected under pressure. Maximum residual pressure for connecting by hand: 10 bar at 6,3 and 10; 6,3 bar at 12,5; 3,15 bar at 20; 2,5 bar at 25; 1,25 bar at 31,5; 0,63 bar at 40; 0,5 bar at 50 |
| Interchange | Series A does not mate with ISO 7241 Series B or with ISO 16028 flat-face couplings; the interfaces are dimensioned against different sets of letters and share no dimension. Use a purpose-made transition coupling, not an adapter |
| Construction | Female half with locking balls and knurled sliding sleeve; male half a stepped probe that lifts the poppet on entry |
| Seal Material and Temperature | Not fixed by the standard - it is set by the maker. As a reference, FASTER rates its ISO 7241 part A interchange range (ANV) with NBR seals at -25 to +125 degrees C, and its own body pressures run 50 MPa at 1/4 in to 15 MPa at 2 in |
| Port Threads | BSPP female to ISO 1179-1, NPTF to ANSI B1.20.3, Rc to EN 10226-2, metric 24 degree cone to ISO 8434-1 L and S, JIC to ISO 8434-2, ORFS to ISO 8434-3 and SAE ORB to ISO 11926-1 are all offered in this class; state the port at order |
