View orientation convention: For elongated parts (screws, bolts, shafts, tubes), are they usually shown vertically in the front view?

Introduction / Context:
Standards and good drafting practice emphasize clear, stable arrangements that communicate shape with minimal views. Elongated parts (screws, bolts, shafts, tubes) are typically oriented so that their long axis is easy to dimension and recognize in the principal views.

Given Data / Assumptions:

• Conventional orthographic drawings are used (first- or third-angle).
• Goal is maximum clarity and efficient dimensioning.
• “Usually” refers to common drafting practice, not a mandatory rule in all cases.

Concept / Approach:
In many textbooks and industry examples, elongated components are presented horizontally in the front view. This allows overall length to be dimensioned along a horizontal baseline, with end features (heads, threads, keyways) easily shown. Vertical orientation is not forbidden, but it is not the default “usually” claimed in the stem. The governing principle is selecting a front view that best shows the characteristic shape; for screws and shafts, that is often a horizontal front view.

Step-by-Step Solution:

Verification / Alternative check:
Survey standard examples in mechanical drawing references: most depict bolts/shafts lying horizontally in the front view for readability and space economy on the sheet. Many title blocks and projection layouts fit these parts better horizontally.

Why Other Options Are Wrong:

• Correct claim of vertical-only is too rigid and contradicts common practice.
• “Only tubes vertical” is arbitrary and unsupported.
• “ISO fixes vertical only” is incorrect; standards do not mandate a single orientation.
• 45° orientation is not a standard convention for principal views.

Common Pitfalls:
Believing there is a universal mandated orientation; ignoring the design intent and dimensioning strategy; assuming assembly drawing conventions apply to all part drawings.

Final Answer:
Incorrect: they are commonly oriented horizontally in the front view for clarity