This standard specifies the characteristics of screws@ pan head@ offset cruciform recess@ coarse tolerance normal shank@ medium length thread@ in alloy steel@ cadmium plated. Classification: 1 100 MPa 1) / 235 ??2) 1) Minimum tensile strength of the material at ambient temperature. 2) Maximum temperature that the screw can withstand without continuous change in its original characteristics@ after return to ambient temperature. The maximum temperature is determined by the surface treatment.
PREN 4138-2014由ASD-STAN - Aerospace and Defence Industries Association of Europe - Standardization 发布于 2014-06-01,并于 2014-07-24 实施。
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