Section hatching conventions In technical drawing, the pattern used to hatch a sectioned area does not have to be limited to simple diagonal lines; other standardized patterns may be used when appropriate (for example, material-specific symbols).

Introduction / Context:
Section views expose interior features by conceptually cutting an object and showing the cut surface. The visual cue for this cut surface is the hatch (section) pattern. Many learners assume hatching must always be diagonal lines; in fact, standards allow a variety of patterns, including material-specific symbols, so long as clarity and consistency are maintained.

Given Data / Assumptions:

• A section view is being created to reveal interior geometry.
• Standards such as ANSI and ISO provide default and material-specific hatch patterns.
• The goal is legibility and unambiguous material/part identification.

Concept / Approach:
The general-purpose (default) hatch is a set of evenly spaced diagonal lines. However, drafting standards also include patterns that indicate materials such as cast iron, steel, concrete, wood, and more. A drafter may select an appropriate pattern if it improves communication, provided that identical parts share identical hatching and adjacent parts are distinguishable by angle or spacing differences.

Step-by-Step Solution:

Verification / Alternative check:
Review the legend or notes to confirm that any non-default pattern is identified if there could be ambiguity. Cross-check with company or project standards to ensure pattern use is permitted.

Why Other Options Are Wrong:
“Incorrect” ignores the allowance for material patterns. “Only allowed in architectural drawings” is too narrow; mechanical and civil drawings also use varied patterns. “Depends on ISO vs. ANSI standards” is misleading; both families allow more than one pattern. “Allowed only for plastic parts” is arbitrary and not a standards-based rule.

Common Pitfalls:
Overusing exotic patterns that reduce legibility, mixing patterns for the same part across views, or choosing line spacing too fine for the plot scale.

Final Answer:
Correct