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This is Steel Extension Spring 44.1mm x 6.3mm manufactured by RS Pro. The manufacturer part number is 751-859. It has 44.1mm free length. Its spring rate is about 1.06n/mm . The product is made from highly stable and reliable steel. The wire has 0.9mm diameter. It has a maximum 73.80mm extended length . Moreover, it has an initial tension about 37.1n . The product has 6.3mm external diameter.
For more information please check the datasheets.
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