Mishnah Kelim 13:4-5

Sugya Map: The Ontology of "Functional Remnants"

• Core Issue: Does the loss of a primary functional component render a metal tool tahor (clean), or does the residual mass maintain its status as a keli?
• Primary Sources: Mishnah Kelim 13:4-5, Rambam, Hilkhot Kelim 11:2-3, Rash mi-Shantz, Kelim 13:4.
• Nafka Mina: Can a fragmented tool be repurposed for a secondary function? If a tool is "broken" but still retains a shem keli (the name/identity of the vessel), it remains tamei.

Text Snapshot

Mishnah Kelim 13:4 states: "If its shaft-socket is broken it is clean." The dikduk here is precise: the beit yad (socket) is the structural anchor. Without it, the tool loses its shem keli entirely. Contrast this with the zomalister (forked tool), where the loss of one functional end is superseded by the utility of the other. The leshon conveys a hierarchy of form: function follows anatomy.

Readings

• Rambam: Focuses on ferzela hinduvah (hardened steel edge). He posits that the hisum (the attachment of the steel blade to the iron body) defines the tool. If the hisum is lost, the tool is tahor because the "effective" part is gone; it is no longer a functioning implement.
• Rash mi-Shantz: Emphasizes mlechet cheresh (craftsmanship). He argues that if a tool—even when broken—can still perform a shadow of its original work (e.g., a magrifah functioning like a hammer), it retains impurity. The chiddush is that tuma follows potentiality, not just original intent.

Friction

Kushya: If the sira (saw) loses alternating teeth, why is it tahor when it can still physically cut? Terutz: The mishnah defines a "tool" by its shiur (measure). If the remaining teeth cannot span a mela sit (a specific width of four fingers), it ceases to be a "saw" and becomes "scrap metal." It is not about the capacity to cut, but the capacity to perform melacha in a professional, standard manner.

Intertext

• Shabbat 105b: The definition of mela sit as a foundational measurement of utility.
• Shulchan Aruch, Orach Chayim 308:35: Defines the threshold of what constitutes a "broken" vessel in the context of muktzeh and tuma.

Psak/Practice

The halachic heuristic here is "functional continuity." If a broken object can still serve a standard, recognized role (even if inferior to its original purpose), it remains a keli. If the breakage destroys the "socket" or the "hardened edge," it is tahor. In modern terms: if the "chassis" of the tool is gone, the tool is gone.

Takeaway

Impurity in Kelim is not a property of the material, but of the form. If the geometry of the tool no longer supports its standard use, the tuma evaporates.