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United Kingdom
This is Stainless Steel Extension Spring 27.7mm x 5.5mm manufactured by RS Pro. The manufacturer part number is 821-447. It has 27.7mm free length. It has looped ends . Its spring rate is about 0.11n/mm . The product is made from highly stable and reliable stainless steel. The wire has 0.5mm diameter. It has a maximum 80mm extended length . Moreover, it has an initial tension about 6.5n . The product has 5.5mm external diameter.
For more information please check the datasheets.
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