ISO/FDIS 9139

Aerospace — Nuts, plain or slotted (castellated) — Procurement specification

General information

Current stage: 50.20 Effective date: Feb 23, 2026

Originator: ISO

Owner: ISO/TC 20/SC 4

Type: International Standard

Scope

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.

Life cycle

PREVIOUSLY

PUBLISHED
ISO 9139:1998

NOW

IN_DEVELOPMENT
ISO/FDIS 9139
50.20 Proof sent to secretariat or FDIS ballot initiated: 8 weeks
Feb 23, 2026

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