For Chasiss Building, pinion gears, motor installation can be used to solder in oilites / ball bearings, not recommended for leadwire solder.
Slot Fox Lead Free Silver Solder (solid, no flux core)
Most Silver - Highest strength
Nominal composition = 5.5 - 6.0% silver , remainder tin
Tensile strength of 10,000-14,000 psi
1/16" Diameter, Approximately 17 grams (4')