🔍 Key Concepts

• Difference between shaft diameter and hole diameter in Figure B • Definition of interference fit vs clearance fit vs running fit • What a tolerance value represents in drafting/dimensioning

💭 Think About

• Compare the .255 dimension of the upper piece in Figure B with the .250 dimension of the lower piece. Does the part slide in easily or need to be forced in? • Ask yourself whether the drawing is specifying a gap, an overlap, or a permissible range of sizes. • Which of the answer choices describes the basic type of fit shown, and which describes a specific numerical amount?

✅ Before You Answer

• Calculate the numerical difference between the two dimensions in Figure B and note its sign (+ or -). • Decide whether that difference indicates clearance (space) or interference (overlap). • Check if the wording of the choice refers to a type of fit or a specific size/tolerance value and match that to what the figure is really showing.