Correct option is B
Bilateral tolerance is a type of dimensional tolerance in which variations are allowed on both sides of the nominal (basic) dimension.
· It is represented as ± value (e.g., 50 ± 0.1 mm means the actual size can vary between 49.9 mm and 50.1 mm).
· This type of tolerance ensures equal distribution of permissible error, making it useful for interchangeable parts and machining operations requiring symmetrical deviations.
· Bilateral tolerances are widely used in precision engineering, CNC machining, and manufacturing industries.
