A ton-force is one of various units of force defined as the weight of one ton due to standard gravity.
[note 1] The precise definition depends on the definition of ton used.
The tonne-force (tf or tf)[note 2] is equal to the weight of one (metric) tonne.
The long ton-force is equal to the weight of one long ton.
The short ton-force is equal to the weight of one short ton.