DIN EN 4321:2006-03
Действует
Aerospace series - Bolts, double hexagon head with lockwire holes, relieved shank, long thread, in heat resisting nickel base alloy NI-PH2601 (Inconel 718), silver plated - Classification: 1550 MPa (at ambient temperature)/650 °C; German and English version EN 4321:2004
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