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Amazon.com: M20 x 2.50 x 70 MM (FT) Coarse Thread DIN 933 / ISO 4017 Class 10.9 Hex Cap Screw (Bolt) Alloy Steel Black Oxide Pk 20 : Industrial & Scientific
What is the difference between ISO 4014 'hexagon head bolts' and ISO 4017 'hexagon head screws'? - Quora
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