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ISO 9139:1998
Aerospace - Nuts, plain or slotted (castellated) - Procurement specification
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.
International Organization for Standardization [iso]