![](/globalassets/inriver/kaller/image/primaryproductimage/kaller_r15_prod.png?width=640)
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R
The R series was named because the tube is roll formed and therefore permanently closed, making these springs non-repairable.
R series springs are available with Ø12, Ø15, and Ø19 mm tube diameters and with stroke lengths up to 125 mm.There are 4 color-coded models, all with preset forces.An adjustable model (black) is also available. It can beordered either set to a specific charge pressure or it can be adjusted by customers with the appropriate charging equipment and training.
![Overload protection system icon](/contentassets/a2fbf8c970b94ebb812b6f99baad2cb6/icon-badge-over-load-protection-system.png)
![](/contentassets/9bbaab688fce43c6ba711bbf16657bf7/icon-badge-over-pressure-protection-system.png)
![](/contentassets/c687a4dd93c74273a84c598a043a4103/icon-badge-over-stroke-protection-system.png)
![](/contentassets/5eb3c58ee5f942eeb0a51692b348e184/icon-badge-ped-approved.png)
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