Assembly section conventions — when not to hatch components In an assembly sectional view, which items are normally shown without section lines (unhatched) or filled solid black to avoid confusion?

Introduction / Context:
Section views of assemblies help reveal how components fit together. However, hatching every cut object can clutter the view and imply continuity where there should be separations. Drafting standards therefore exempt certain standardized hardware from hatching.

Given Data / Assumptions:

• The view is an assembly section (multiple parts together).
• Standard hardware like bolts, nuts, pins, washers, and rivets are present.
• Goal: maintain clarity and avoid misleading the reader.

Concept / Approach:
Fasteners are conventionally not sectioned in assembly sections. They are either left blank (no hatch) or rendered solid for emphasis. This prevents visual “merging” of adjacent hatched parts and keeps attention on mating features like seats, counterbores, or bearing surfaces.

Step-by-Step Solution:
Cut through the assembly along the designated plane.Apply hatching only to structural parts (housings, brackets, etc.).Leave standardized fasteners unhatched or solid black, per company standard.Ensure hatch angles differ between adjacent parts to aid distinction.

Verification / Alternative check:
Check standard references: fasteners and some shafts/keys are customarily unsectioned in assembly sections to avoid confusing crosshatch patterns.

Why Other Options Are Wrong:

• Bolts or Rivets (alone): true but incomplete; the rule applies to all fasteners.
• Thin parts: may require adjusted hatch spacing, not blanket omission.

Common Pitfalls:
Hatching nuts/bolts leading to visual noise, using identical hatch angles for adjacent parts, or forgetting to remove hidden lines where the section reveals internal edges.

Final Answer:
All fasteners