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ISO 9139:1998 Aerospace - Nuts, plain or slotted (castellated) - Procurement specification
standard by International Organization for Standardization, 12/01/1998
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Full Description
This International Standard specifies the required characteristics for metric plain or slotted (castellated) nuts, with MJ threads according to ISO 5855-2, for use in aerospace construction.
It is applicable to nuts as defined above, provided that reference is made to this International Standard in the relevant definition document.