Correct option is D
Shaft basis system: In a shaft basis tolerance system, the upper deviation of the shaft is set to zero, meaning the maximum shaft size is equal to the basic size. The hole size varies to achieve the desired fit (clearance, transition, or interference).
· This system is used when the shaft is manufactured with a standard size, and the hole dimensions are adjusted.
· The tolerance limits apply to the hole, while the shaft remains at a fixed size.
· Hole Basis System: Lower deviation of the hole is zero. The hole size remains fixed, and the shaft size varies.
