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This is Stainless Steel Extension Spring 22.1mm x 3.2mm manufactured by RS Pro. The manufacturer part number is 821-419. It has 22.1mm free length. Its spring rate is about 0.407n/mm . The product is made from highly stable and reliable stainless steel. The wire has 0.45mm diameter. It has a maximum 42.30mm extended length . Moreover, it has an initial tension about 8.91n . The product has 3.2mm external diameter.
For more information please check the datasheets.
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