BS A 317-1997 带MJ螺纹的标称高度和标称交叉平面的平六角头螺母分类:600MPa(室温)/120℃、600MPa(室温)/235℃、900MPa(室温)/425℃、1100MPa(室温)/235℃、1100MPa(室温)/315℃、1100MPa(室温)/650℃、1210MPa(室温)/730℃、1250MPa(室温)/235℃、1550MPa(室温)/600℃.尺寸
Nuts, hexagonal, plain, normal height, normal across flats, with MJ threads, classifications - 600 MPa (at ambient temperature)/120 °C, 600 MPa (at ambient temperature)/235 °C, 900 MPa (at ambient temperature)/425 °C, 1100 MPa (at ambient temperature)/235
This International Standard specifies the dimensions of plain, hexagonal nuts, normal height, normal across flats, with MJ threads, of classifications: 600 MPa /120℃ , 600 MPa /235 ℃ , 900 MPa/ 425 ℃ . 1 100 MPa /235 ℃ , 1 100 MPa /315 ℃ , 1 100 MPa /650 ℃ , 1 210 MPa /730 ℃ , 1 250 MPa /235 ℃ and 1 550 MPa /600 ℃ .
Nuts provided with holes are intended to be used with lockwire in conformity with ISO 245.
This International Standard is only applicable for the compilation of aerospace product standards.
note:1) Corresponds to the minimum tensile stress which the nut is able to withstand at ambient temperature without breaking or cracking when tested with a bolt of a higher strength class.
2) Maximum temperature that the nut is able to withstand, without permanent alteration to its original characteristics, after ambient temperature has been restored. The maximum temperature is conditioned by the material or by the surface treatment.