PREN 4178:2014被替代
Aerospace Series - Screws, Pan Head, Six Lobe Recess, Coarse Tolerance Normal Shank, Medium Length Thread, In Titanium Alloy, Anodized, Mos[2] Lubricated - Classification: 1100 Mpa (At Ambient Temperature)/315 Degrees C
出版：Aerospace & Defence Industries Association of Europe
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