Yes, the heading explicitly covers parts of anchors and grapnels, and they share the single subheading 731600 with complete articles. However, if a part is more specifically described by another heading — for example, a shackle or chain — it may be classified there instead. The General Rules of Interpretation and any applicable chapter notes govern borderline cases.

No. All iron or steel anchors and grapnels, regardless of design, fall under heading 7316. Design type affects performance and commercial value but is not a classification criterion at the heading or subheading level.