Chart of Mandrel Sizes for Making Jump Rings

Jump rings are usually designated by their outside dimensions. This is a chart of mandrel sizes and wire gauges required to make jump rings of a predetermined size. These values are for round wire cut using a saw with a number zero (#0) piercing blade.

Jump Ring Diameter	Wire Gauge	Mandrel
4 mm	20 ga. (0.75 mm)	2.5 mm
5 mm	20 ga. (0.75 mm)	3.5 mm
5 mm	18 ga. (1 mm)	3 mm
6 mm	18 ga. (1 mm)	4 mm
6.5 mm	16 ga. (1.25 mm)	4 mm
7 mm	18 ga. 1 mm)	5 mm
7 mm	16 ga. (1.25 mm)	4.5 mm
7.5 mm	16 ga. (1.25 mm)	5 mm
8 mm	18 ga. (1 mm)	6 mm
9 mm	18 ga. (1 mm)	7 mm
9 mm	16 ga. (1.25 mm)	6.5 mm
9 mm	14 ga. (1.5 mm)	6 mm
12.5 mm	14 ga. (1.5 mm)	9.5 mm

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