This International Standard specifies basic tests to verify the stability of counterbalanced fork-lift trucks. It applies to counterbalanced fork-lift trucks with tiltable or non-tiltable masts, whether rider-controlled or with a separate operator, of rated capacity up to and including 50 000 kg (110 000 lb). It also applies to trucks operating under the same conditions when equipped with load-handling attachments. This International Standard does not apply to trucks with retractable devices such as a mast or fork, or when handling suspended loads which may swing freely. NOTE - Additional tests for industrial trucks operating in special con- ditions of stacking with pre-determined offset will form the subject of a separate International Standard.