The jeweller's micro-torch is a small handheld torch producing a sharp, low-volume flame suitable for the soldering, re-tipping, and small-fabrication tasks at the bench that are too delicate for a full oxy-acetylene torch. Most modern designs are self-contained butane units, refillable from a domestic gas canister, while higher-capacity workshop tools use bottled oxy-propane or oxy-acetylene at low working pressures. The defining specification is the size of the flame, which on a typical butane unit is between 5 and 30 millimetres long at the working tip.

Form and Use

The torch typically incorporates a piezo ignition, an adjustable flame valve, and a refill port at the base. Working temperatures of around 1300°C are sufficient to flow easy and medium silver and gold solder, to anneal small components, and to fuse fine wire. The tool is held in one hand while the other holds tweezers or an articulated third hand, and the work is supported on a charcoal or magnesia soldering block.

Common bench tasks for the micro-torch include sizing rings, attaching jump rings and small bezels, repairing chain, and re-tipping worn prongs. For larger work involving heavy castings, the micro-torch has insufficient heat output and a full propane or oxy-fuel torch is used.

Safety

The fuel canister is pressurised and flammable; refilling is done away from open flame and in a ventilated area. Eye protection rated for the work, fire-rated bench surfaces, and a charged extinguisher are workshop standards. The flame retention chamber on the tip is small and can crack with heavy use; torches are inspected before each session for tip integrity, and the regulator is closed when the unit is set down on the bench.