🔍 Key Concepts

• Carefully distinguish between length dimensions (along the shaft) and diameter dimensions (across the shaft). • Understand how threads are called out on a mechanical drawing, including the difference between pipe tap (usually internal) and external threads. • Notice how maximum and minimum diameters are shown with tolerance limits (e.g., two numbers stacked, like 1.522 / 1.5xx).

💭 Think About

• Look at where the 0.64 dimension arrows start and end. Is this showing a change in diameter (a step) or just the axial length of a cylindrical section? • Compare the text near the threaded portions: does it say 1-inch pipe thread on the outside of the shaft, or something else (e.g., a different diameter and a pipe tap inside)? • Find the largest diameter callout on the drawing. Does the note or tolerance there support the claim about the maximum shaft diameter?

✅ Before You Answer

• Verify whether the 0.64 dimension is parallel to the shaft centerline (length) or perpendicular (diameter). • Check if the notation "1.125 NF THD (BOTH ENDS)" and "1/8 PIPE TAP (BOTH ENDS)" match the description of 1-inch external pipe thread. • Confirm from the front view which circle represents the maximum outside diameter and read its full dimension (both upper and lower tolerance values).