Arukh HaShulchan, Orach Chaim 308:28-36

Sugya Map

• Issue: The definition of keli she-melachto le-issur (utensils designated for prohibited labor) and the conditions for their use on Shabbat.
• Nafka Mina: Whether a tool that possesses a secondary permissible use retains its status as muktzah when the primary prohibited use is dominant.
• Primary Sources: Shabbat 123a, Shulchan Aruch, Orach Chaim 308:3, Arukh HaShulchan, Orach Chaim 308:28-36.

Text Snapshot

• Ref: Arukh HaShulchan, Orach Chaim 308:31
• Nuance: R' Epstein writes: "וכל דבר שעיקרו למלאכת איסור... אף על גב דחזי נמי למלאכת היתר." Note the af al gav—he insists that the ikkar (essence) of the vessel dictates its halachic category, regardless of the tzorech (need) for a secondary permitted function.

Readings

• Magen Avraham (308:12): Argues that if a vessel is used for both (e.g., a hammer for nuts), it is not muktzah. He prioritizes the actual usage over the factory designation.
• Arukh HaShulchan: Counters by defining muktzah through the lens of heker (recognition). The ikkar of the tool governs its status unless the owner explicitly reclassifies it.

Friction

• Kushya: If the tool can be used for permitted tasks, why treat it as muktzah? Isn't the heftza (object) objectively useful for hetter?
• Terutz: The Arukh HaShulchan posits that muktzah is a psychological-legal construct. If the common usage is issur, the tzura (form) of the vessel is "prohibited." The hetter is incidental, not essential.

Intertext

• Parallel: Shulchan Aruch, Orach Chaim 308:3 regarding the kurdum (ax). The consensus aligns with the Arukh HaShulchan that common usage defines the keli.

Psak/Practice

The Arukh HaShulchan demands we prioritize the ikkar of the tool. If you aren't using it for that ikkar, you generally cannot move it unless you have a tzorech gufo (need for the body of the tool) or tzorech mekomo (need for its space).

Takeaway

Don't be fooled by a tool's potential for hetter; if its ikkar is issur, the Arukh HaShulchan treats the issur as its defining legal "soul."