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Antique Copper / 4mm ID Round Jump Rings
20 Gauge - Sawcut - Open - Plated Brass
TierraCast 4mm Round Jump Rings are made with 20 gauge (0.8mm) wire and have an inside diameter (ID) of approx 4mm and an outside diameter (OD) of approx 5.4mm with an aspect ratio of 4.7 (AR). These are sawcut plated brass open jump rings.
Use these jumprings for making chainmail jewelry or to attach charms to bracelets, clasps onto chain, etc.
TierraCast is a USA based company that specializes in quality pewter cast components for the jewelry making industry. The TierraCast product line provides affordable, quality components that compliment a wide range of jewelry and beadwork.
- Round Open Jump Rings
- Plated Brass
- 20 Gauge (0.8mm)
- ID (mm) 3.78 - ID (in) .149
- OD (mm) 5.40 - OD (in) .213
- Aspect Ratio (AR) 4.7
This item is available in the following finishes
Gauge - GA - AWG - this is the thickness of the wire. Most jump rings are manufactured using standard wire that is measured in gauges. We list our wire and jump rings using the AWG or American Wire Gauge system.
ID - inside diameter - measurement of the closed jump ring from inside edge to inside edge across the center.
OD - outside diameter - measurement of the closed jump ring from the outside edge to outside edge across the center.
AR - Aspect Ratio - specific to chainmail designs measures the inside diameter (ID) of the jump ring by the thickness (Gauge) of the wire or AR = ID / GA. This is a guideline measurement to determine whether a certain size jump ring will work with the weave you plan to use.
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