<h1>Reversible tapping chucks: input-output norms set allowable imported inputs, quantities and net-to-net treatment for bearings and components.</h1> Input-output norms for Reversible Tapping Chucks TA 20 permit alloy steel rounds/bars at 2.47 kg per kg of export product and treat deep groove ball bearings, shoulder sleeve bearings, shims, and discs/retaining rings on a net-to-net basis; applicants must ensure imported goods are those used or required in the export product.