# Expressing a dimension as $18.3^{-0.00}_{+0.02}$ mm is the case of-

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Expressing a dimension as $18.3^{-0.00}_{+0.02}$ mm is the case of-
1. Unilateral tolerance
2. Bilateral tolerance
3. Limiting dimensions
4. All of the options

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Correct Answer - Option 1 : Unilateral tolerance

Explanation:

• Tolerance is the difference between the upper limit and the lower limit of a dimension.
• Tolerance Zone is the zone between the maximum and minimum limit size.
• Unilateral Tolerance: The dimension of a part is allowed to vary only on one side of the basic size, i.e. tolerance lies wholly on one side of the basic size either above or below it.
• Bilateral Tolerance: The dimension of the part is allowed to vary on both sides of the basic size, i.e. the limits of tolerance lie on either side of the basic size.

For example:

$18.3_{ - 0.05}^{+ 0.05}$: Upper limit = 18.35; Lower limit = 18.25 ⇒ Bilateral tolerance​

$18.3_{ +0.02}^{ -0.00}$: Upper limit = 18.32; Lower limit = 18.3 ⇒ Unilateral tolerance