BS EN 12320:2021 pdf free download – Building hardware一Padlocks and padlock fittings一Requirements and test methods.
It is not allowed to drill or widen the diameter of the hole in order to place a screw with a bigger diameter than is possible to attach in the first attempt. The load shall be applied without removing and re-inserting the screw.
The pulling test is conducted with one screw only at the same time.
It is not allowed to lubricate the screw or the plug during the attempt to attach the screw.
On a screw which is attached into the plug a pulling test shall be performed. The pulling test shall continue until either:
— The value in Table 2 for the grade has been reached; or
— The whole cylinder or plug is removed; or
— The screw breaks; or
— The screw is completely withdrawn from the plug;
— The screw cannot be inserted or does not grip in the plug.
More than one pulling test is allowed on the same cylinder with different screw diameters within the required time for the test.
The time restarts when the pulling force starts to pull. The time will be stopped when the screw is out of the cylinder. If a second attempt with an additional screw will be made, the time shall restart when screwing in the additional screw.
The screw shall be applied axial (tolerance ± 5°) to the rotation of the cylinder plug. The maximum screwing torque is 12 Nm.
The required pulling force shall linearly increase from 0 kN up to the force which is stated for the chosen grade in Table 2 within a period of 30 s ± 5 s. The maximum force shall be held for 5 seconds.
After the test in accordance with 5.5.3 the padlock should not open manually with a torque applied of
maximum 5 Nm.
5.5.5 Resistance to torque on cylinder plug or locking mechanism (Requirement in 4.5.5)
Mount the padlock in a suitable holding fixture and apply a torque M2 (Table 2) by means of an appropriate tool (test tools 5.1.3) inserted into the keyway as shown in Figure B.1. The tool used shall be
attempted to be inserted into the keyway with a maximum of five blows with a 300 g hammer. The torque shall be applied once in alternate directions.
If the torque test required cannot he applied, the padlock shall he deemed to have passed the test.
5.5.6 Resistance to pulling of shackle or staple (Requirements in 4.5.6)
Mount the padlock or staple in test-rigs as shown in Figure B.3 adapted to the form of the device under test, and apply a pull force F2 (Table 2) to the shackle/staple by means of a circular drawing bar with a diameter equal to maximum 80% of the horizontal shackle clearance, or maximum 80% of the internal diameter, or horizontal clearance of the staple.
5.5.7 Resistance to twisting of shackle or staple (Requirements in 4.5.7)
Mount the padlock or staple in test-rigs as shown in Figure B.4 adapted to the form of the device under test, and apply a torque M3 (Table 2) to the shackle/staple by means of a loading device which makes contact at points corresponding to half the internal height of the shackle/staple limited to 25 mm maximum.
Support the padlock body similarly at half its height.
5.5.8 Resistance to cutting of shackle or staple (Requirements in 4.5.8)
5.5.8.1 General
Where there is sufficient access, as indicated by the accessibility checks below, subject the shackle or the staple to a cutting force of F3 (Table 2) applied by means of special jaws as shown in Figure B.5. Where restricted access is indicated, the same test shall be carried out, with the force F3, reduced to that of a lower grade, as determined by the accessibility check. If there is less than a 7 mm of shackle/staple exposed during the accessibility check, the component is considered to have passed the cutting test, and no further assessment is necessary.