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These jump ring mandrels from Durston have straight, closely spaced diameters for winding coils and cutting consistent jump rings, whether you're using a jump ring maker or coiling by hand. The smooth shafts feel solid in the hand so wire tracks evenly as you wrap and cut. Available in 20 individual sizes ranging from 2.5–12.0 mm, these mandrels are sold individually so you can build or replace exactly the sizes your bench requires.
| Detail | Value |
|---|---|
| Size Range | 2.5–12.0 mm (approx. 0.10–0.47") |
| Number of Sizes | 20 individual mandrel diameters |
| Mandrel Hole Detail | 2.5–4.0 mm solid; 4.5–12.0 mm with through-holes |
| Sold As | Individually |
| Brand | Durston |
| Part # | Mandrel Size |
|---|---|
| 143.101-25 | 2.5 mm (0.10") |
| 143.101-30 | 3.0 mm (0.12") |
| 143.101-35 | 3.5 mm (0.14") |
| 143.101-40 | 4.0 mm (0.16") |
| 143.101-45 | 4.5 mm (0.18") |
| 143.101-50 | 5.0 mm (0.20") |
| 143.101-55 | 5.5 mm (0.22") |
| 143.101-60 | 6.0 mm (0.24") |
| 143.101-65 | 6.5 mm (0.26") |
| 143.101-70 | 7.0 mm (0.28") |
| 143.101-75 | 7.5 mm (0.30") |
| 143.101-80 | 8.0 mm (0.31") |
| 143.101-85 | 8.5 mm (0.33") |
| 143.101-90 | 9.0 mm (0.35") |
| 143.101-95 | 9.5 mm (0.37") |
| 143.101-100 | 10.0 mm (0.39") |
| 143.101-105 | 10.5 mm (0.41") |
| 143.101-110 | 11.0 mm (0.43") |
| 143.101-115 | 11.5 mm (0.45") |
| 143.101-120 | 12.0 mm (0.47") |
The smallest mandrels (2.5–4.0 mm) are solid and best suited to very fine coils; larger diameters include a through-hole that helps when sliding off longer coils after cutting. Choose your size based on the finished inner diameter you need for your jump rings and the wire gauge you typically use. Need several sizes? Open the Quick Order tab to add multiple variants at once.
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