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Hexagonal nut with flange EN 1661, steel 10, zinc-plated, blue passivated (A2K)
Hexagonal nut with flange EN 1661, steel 10, zinc-plated, blue passivated (A2K) - 1
Hexagonal nut with flange EN 1661, steel 10, zinc-plated, blue passivated (A2K) - 2

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Hexagonal nut with flange EN 1661, steel 10, zinc-plated, blue passivated (A2K)

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ISO EN 1661 replaces DIN 6923 | There is some similarity | Fine thread removed | Width across flats for size M10 changed from 15 mm to 16 mm.