Metal vessels, whether they are flat or form a receptacle, are susceptible to impurity. On being broken they become clean. If they were re-made into vessels they revert to their former impurity. Rabban Shimon ben Gamaliel says: this does not apply to every form of impurity but only to that contracted from a corpse.

Every metal vessel that has a name of its own [is susceptible to impurity,] Except for a door, a bolt, a lock, a socket under a hinge, a hinge, a clapper, and the [threshold] groove under a door post, since these are intended to be attached to the ground.

If vessels are made from iron ore, from smelted iron, from the hoop of a wheel, from sheets, from plating, from the bases, rims or handles of vessels, from chippings or filings, they are clean. Rabbi Yohanan ben Nuri says: even those made of pieces of vessels. From [vessels that are made] of fragments of vessels, from pieces of old vessels, or from nails that were known to have been made from vessels, are unclean. [If they were made] from ordinary nails: Bet Shammai says: they are unclean, And Bet Hillel says that they are clean.

If unclean iron was smelted together with clean iron and the greater part was from the unclean iron, [the vessel made of the mixture] is unclean; If the greater part was from the clean iron, the vessel is clean. If each was half, it is unclean. The same law also applies to a mixture of cement and cattle dung. A door bolt is susceptible to impurity, but [one of wood] that is only plated with metal is not susceptible to impurity. The clutch and the crosspiece [of a lock] are susceptible to impurity. A door-bolt: Rabbi Joshua says: he may remove it from one door and hang it on another on Shabbat. Rabbi Tarfon says: it is like all other vessels and may be carried about in a courtyard.

A metal spindle-knob:Rabbi Akiva says it is susceptible to impurity But the sages say it is not susceptible. If it was only plated [with metal] it is clean. A spindle, a distaff, a rod, a double flute and a pipe are susceptible to impurity if they are of metal, but if they are only plated [with metal] they are clean. If a double flute has a receptacle for the wings it is susceptible to impurity in either case.

A curved horn is susceptible to impurity but a straight one is clean. If its mouthpiece was covered with metal it is unclean. If its broad side [is covered with metal]: Rabbi Tarfon says it is susceptible to impurity But the sages say it is clean. While they are joined together the whole is susceptible to impurity. Similarly: the branches of a candlestick are clean. And the cups and the base are susceptible to impurity, But while they are joined together the whole is susceptible to impurity.

A helmet is susceptible to impurity but the cheek-pieces are clean, But if they have a receptacle for water they are susceptible to impurity. All weapons of war are susceptible to impurity: a javelin, a spear-head, metal boots, and a breastplate are susceptible to impurity. All women's ornaments are susceptible to impurity: a golden city (a tiara), a necklace, ear-rings, finger-rings, a ring whether it has a seal or does not have a seal, and nose-rings. If a necklace has metal beads on a thread of flax or wool and the thread broke, the beads are still susceptible to impurity, since each one is a vessel in itself. If the thread was of metal and the beads were of precious stones or pearls or glass, and the beads were broken while the thread alone remained, it is still susceptible to impurity. The remnant of a necklace [is susceptible] as long as there is enough for the neck of a little girl. Rabbi Eliezer says: even if only one ring remained it is unclean, since it also is hung around the neck.

If an earring was shaped like a pot at its bottom and like a lentil at the top and the sections fell apart, the pot-shaped section is susceptible to impurity because it is a receptacle, while the lentil shaped section is susceptible to impurity in itself. The hooklet is clean. If the sections of an ear-ring that was in the shape of a cluster of grapes fell apart, they are clean.