<h1>Input-output norms restrict imported casing pipe inputs to specified API standards and require net-to-net use in exports.</h1> Standard input-output norms under the Foreign Trade Policy permit casing pipes of OD 114 mm to 508 mm conforming to API Specification 5CT or equivalent, manufactured from Seamless Steel or ERW Steel. Specified inputs include plain-end seamless or ERW pipes, coupling stock, finished thread inserts and cross overs with indicated quantities. The norms require net-to-net accountability for certain components and mandate that applicants ensure imported goods are the ones used or required in the declared export product; schedules determine allowable input proportions for resultant products.