ISO 14541 Standard Dimensions and requirements for screw-to-connect quick-action couplings for general purpose
ISO 14541 specifies the dimensional and performance requirements for hydraulic screw-to-connect quick-action couplings for general use.
ISO 14541 Standard Dimensional requirements
-
a Radius or combined radius-chamfer
- b The valve shape is optional
- c The female half and the male sleeve should be designed to guarantee relative rotation between the connected halves
- The size designation corresponds to the nominal hose size of the hose recommended for use with the coupling: see ISO 4397
- The shape of the sleeve can be round with wrench flats or hexagonal.
| Body Size mm |
Body Size inch |
Da | φD1 | φD2 | φD3 | L1 max. |
L2 max. |
L3 | L4 | L5 min |
L6 ±0.3 |
R max. |
| 6.3 | 1/4" | M24x2 | 2.5 | 12.85 12.95 |
24.40 24.50 |
3.5 | 0.5 | 1 1.5 |
14.65 14.75 |
11.5 | 15.2 | 0.5 |
| 10 | 3/8" | M28x2 | 3.0 | 17.35 17.45 |
28.45 28.55 |
3.8 | 0.5 | 1 2 |
14.95 15.05 |
12.1 | 14.1 | 0.5 |
| 12.5 | 1/2" | M36x2 | 4.5 | 21.90 22.00 |
36.50 36.70 |
4.5 | 0.5 | 1.5 2.5 |
16.95 17.05 |
11.3 | 16.3 | 0.5 |
| 20 | 3/4" | M42x2 | 5.4 | 27.85 27.95 |
42.70 42.80 |
7.5 | 0.5 | 1.5 2.5 |
20.85 21.00 |
11.0 | 21.5 | 0.5 |
| a Thread D conforms to ISO 724; tolerances conform to ISO 965-1, grade 7G. | ||||||||||||
ISO 14541 Standard Performance requirements
Couplings conforming to this International Standard shall meet or exceed the performance requirements specified in the table below.
| Body Size mm |
Body Size inch |
Max. Working Pressure | Min. Burst Pressure | Rated flow rate | Max. Pressure drop at rated flow rate | Rated surge flow rate | Max. Fluid spillage | |
| Coupled | Uncoupled | |||||||
| MPa (bar)a | MPa (bar) | MPa (bar) | l/min | kPa (bar) | l/min | ml | ||
| 6.3 | 1/4" | 35 (350) | 140 (1400) | 140 (1400) | 12 | 250 (2,5) | 36 | 0,8 |
| 10 | 3/8" | 30 (300) | 120 (1200) | 120 (1200) | 23 | 200 (2) | 69 | 1,4 |
| 12.5 | 1/2" | 30 (300) | 120 (1200) | 120 (1200) | 45 | 150 (1,5) | 135 | 2,7 |
| 20 | 3/4" | 25 (250) | 100 (1000) | 100 (1000) | 106 | 220 (2,2) | 318 | 9,3 |
| a, 1 bar= 100 kPa = l05 Pa= 0,1 MPa; 1 Pa= 1 N/m2. | ||||||||
- The performance requirements apply to couplings made from carbon steel. The use of any combination of other materials and the related performance requirements shall be agreed upon between the customer and the manufacturer.
- The maximum working pressure shall be verified by a pressure impulse test conducted in accordance with ISO 7241-2 for 200 000 cycles in the uncoupled condition and 500 000 cycles in the coupled condition. The type, size, and tolerance class of the thread used on the counterpart of the coupling should be recorded in the test report.
- The minimum burst pressure shall be verified in the coupled and uncoupled conditions by testing in accordance with ISO 7241-2.
- The pressure drop at the rated flow rate, fluid loss, and surge flow rate capability shall be verified by testing in accordance with ISO 7241-2.
- Couplings shall be designed to be connected at 33 % of the maximum working pressure, which is considered to be the residual working pressure in one coupling half. Couplings shall pass the endurance test specified in ISO 7241-2 by connecting 100 times with an internal pressure of 33 % of the maximum working pressure without any damage to the coupling’s functionality.
