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Aerospace series. Screw, 100° countersunk normal head, Spiral Drive Recess, coarse tolerance normal shank, long thread, in alloy steel, cadmium plated. Classification- 1 100 MPa (at ambient temperature)/235 °C. Original standard UNE-EN 4851-2022 in PDF full version. Additional info + preview on request

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Aerospace series. Externally threaded fastener, 100° countersunk normal head, Spiral Drive Recess. Classification- 1 100 MPa (at ambient temperature)/425 °C. Original standard UNE-EN 4853-2022 in PDF full version. Additional info + preview on request

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Operation of electrical installations Part 2- National annexes. Original standard UNE-EN 50110-2-2024 in PDF full version. Additional info + preview on request

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Railway applications Fixed installations Electrical safety, earthing and the return circuit Part 1- Protective provisions against electric shock. Original standard UNE-EN 50122-1-2023 in PDF full version. Additional info + preview on request

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Railway applications Fixed installations Electrical safety, earthing and the return circuit Part 2- Provisions against the effects of stray currents caused by DC traction systems. Original standard UNE-EN 50122-2-2023 in PDF full version. Additional info + preview on request

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Railway applications - Fixed installations - Electrical safety, earthing and the return circuit Part 3- Mutual Interaction of AC and DC traction systems. Original standard UNE-EN 50122-3-2023 in PDF full version. Additional info + preview on request

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