A ton-force is one of various units of force defined as the weight of one ton due to standard gravity. The precise definition depends on the definition of ton used.
The tonne-force (tf or tf) is equal to the weight of one 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.
STF may refer to:
HD 130603 is a double star in the northern constellation of Boötes. As of 2010.476, the components have an angular separation of 2.06″ along a position angle of 54.7°.