This International Standard specifies the dimensions of floating, self-aligning, two lug anchor nuts, with MJ threads and a self-locking feature achieved by forming the upper portion out-of-round, of classifications: 900 MPa /235 ℃ , 900 MPa /315 ℃ and 900 MPa /425 ℃ . 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.
BS A 320-1997由英国标准学会 GB-BSI 发布于 1997-10-15,并于 1997-10-15 实施,于 2010-10-31 废止。
BS A 320-1997 在中国标准分类中归属于: J13 紧固件,在国际标准分类中归属于: 49.030.30 螺母。
BS A 320-1997 双耳浮动自锁紧自调整MJ螺纹固定螺母分类:900MPa(室温)/235℃、900MPa(室温)/315℃、900MPa(室温)/425℃.尺寸 于 2010-10-31 变更为 BS ISO 12273-2010 航空航天.等级为:900 MPa(环境温度)/235℃,900 MPa(环境温度)/315℃和900 MPa(环境温度)/425℃, 带MJ螺纹自动对准双耳浮动托板自锁螺母.尺寸规格。
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