Mishnah Kelim 13:6-7

Sugya Map: The Ontology of "Functional Parts"

• Issue: When does a component of a vessel attain independent tumah (impurity) status, and what is the minimum functional threshold?
• Nafka Mina: Whether a broken tool retains "vessel" status via its remaining functional parts vs. whether the parts themselves are "vessels" (klei metal).
• Primary Sources: Mishnah Kelim 13:6-7, Shabbat 81a.

Text Snapshot: The Minimalist Definition

Mishnah Kelim 13:6 states: "The minimum size for all these instruments: so that they can perform their usual work." The Mishna employs a functionalist teleology: the tumah is not inherent to the material volume but to the residual melacha (functionality). The dikduk here is subtle—the Mishnah moves from the whole tool to its fragments, shifting the locus of impurity from the "object" to the "serviceability" of the part.

Readings

• Rash MiShantz: Emphasizes that "teeth" (chafin) of a lock are independently susceptible if they are detachable and functional, distinguishing between permanently fixed components and modular ones Rash on Kelim 13:6.
• Tosafot Yom Tov: Notes that while raw metal "golemim" are clean, once a part is set into a finished vessel, it gains status, even if it lacked independent utility before integration Tosafot Yom Tov on Kelim 13:6:2.

Friction: The "Missing Component" Paradox

Kushya: If a stylus is clean when missing its point, yet a lock’s tooth is impure when standing alone, why does the Mishnah seem to vacillate on what constitutes a "vessel"? Terutz: The status follows the ikar (primary component). If the ikar remains, the object is a vessel; if a secondary part (like a decorative seal) is missing, the tool remains a vessel. The "teeth" of a lock are considered distinct, high-utility tools themselves, whereas the "point" of a stylus is an essential, non-independent extension.

Intertext

• Halachic Parallel: The principle that metal serving wood is clean, wood serving metal is susceptible mirrors the rules of bitul in Shulchan Aruch, Orach Chaim 301 regarding accessories (tashmishin) to vessels.

Psak/Practice

The heuristic is functional integrity. In modern contexts, if a component’s removal renders the device incapable of its primary melacha, the vessel loses its status. However, if the component itself possesses independent, recognizable utility (like a specialized drill bit), it retains status as a kli in its own right.

Takeaway

Impurity in Kelim is not a property of matter, but a tether to human utility; when the melacha survives in the fragment, the tumah survives with it.