BS ISO 12273-2010 PDF

Full title and description

STB BS ISO 12273-2010 — Aerospace — Nuts, anchor, self-locking, floating, self-aligning, two lug, with MJ threads, classifications: 900 MPa (at ambient temperature)/235 °C, 900 MPa (at ambient temperature)/315 °C and 900 MPa (at ambient temperature)/425 °C — Dimensions. This publication gives the dimensional specifications for a family of two-lug anchor nuts with an integral self‑locking feature intended for aerospace product standardization and procurement.

Abstract

Specifies the dimensions of floating, self‑aligning, two‑lug anchor nuts with MJ threads and a self‑locking feature produced by forming the upper portion out‑of‑round. Covers three strength/temperature classifications (900 MPa at ambient / 235 °C; 900 MPa at ambient / 315 °C; 900 MPa at ambient / 425 °C) and is intended for compilation and use in aerospace product standards.

General information

• Status: Published (confirmed).
• Publication date: September 2010.
• Publisher: International Organization for Standardization (published as ISO 12273:2010; available/adopted in national collections as BS ISO / STB BS ISO variants).
• ICS / categories: 49.030.30 (Aerospace engineering; aerospace fasteners/assemblies).
• Edition / version: Edition 2 (ISO 12273:2010).
• Number of pages: 3 pages.

(Core bibliographic details above are taken from the ISO record; examples of national adoption identifiers such as "STB BS ISO 12273-2010" appear in specialist standards catalogues/resellers.)

Scope

This standard defines only the dimensional requirements for the specified type of two‑lug floating anchor nuts with MJ threads and a formed self‑locking feature. It is limited to the three listed classifications by strength and elevated temperature and is intended for use when compiling aerospace product standards and procurement specifications rather than providing material, heat‑treatment or finish prescriptions beyond those necessary to define the part dimensions and classifications.

Key topics and requirements

• Dimensional drawings and tolerances for floating, self‑aligning two‑lug anchor nuts with MJ threads.
• Definition of the self‑locking feature achieved by forming the nut upper portion out‑of‑round.
• Classifications for mechanical strength and elevated temperature performance: 900 MPa at ambient with rated capability at 235 °C, 315 °C and 425 °C.
• Intended application limited to aerospace product standards and assemblies; not a general commercial fastener specification.
• Reference to ISO/TC 20/SC 4 as the responsible technical committee for related aerospace fastener standards.

Typical use and users

Used by aerospace design and stress engineers, fastener and component manufacturers, OEM procurement and quality teams, engineering drawing and specification writers, and conformity assessment bodies preparing or checking parts lists and procurement documents for aircraft and aerospace hardware where two‑lug anchor nuts with MJ threads are required. Also used by national standards bodies when adopting or re‑publishing the ISO text under local designations (e.g., BS ISO, STB BS ISO).

Related standards

ISO 12273:2010 superseded ISO 12273:1997 (withdrawn). Related work is carried out under ISO/TC 20/SC 4 (aerospace fasteners); other complementary ISO and national standards covering aerospace fasteners, thread forms, test methods and material/finish requirements should be considered together with this dimensional standard when preparing procurement or manufacturing specifications. National adoptions and reseller catalogues may list the standard as BS ISO 12273-2010 or STB BS ISO 12273-2010.

Keywords

aerospace; anchor nut; two‑lug nut; floating nut; self‑aligning; self‑locking; MJ threads; dimensions; fasteners; ISO 12273.

FAQ

Q: What is this standard?

A: ISO 12273:2010 (also distributed/available under national adoption identifiers such as BS ISO / STB BS ISO 12273-2010) is an international dimensional standard for floating, self‑aligning two‑lug anchor nuts with MJ threads and an integral self‑locking feature, intended for aerospace use.

Q: What does it cover?

A: It covers only the dimensions and related tolerances for the specified anchor nut types and the defined strength/temperature classifications (900 MPa / 235 °C, 315 °C and 425 °C). It is intended for use in aerospace product standards and procurement documentation.

Q: Who typically uses it?

A: Aerospace designers, manufacturing and fastener suppliers, procurement and quality teams, standards committees and conformity assessment bodies that manage or verify parts lists and specifications for aircraft and aerospace assemblies.

Q: Is it current or superseded?

A: ISO 12273:2010 is Edition 2 published September 2010. The ISO record shows the publication was reviewed and confirmed (most recently in 2021) and remains current in the ISO catalogue. The prior edition ISO 12273:1997 was withdrawn.

Q: Is it part of a series?

A: It is a standalone dimensional standard for a specific nut form but sits within a family of aerospace fastener standards maintained by ISO/TC 20/SC 4; users should check other ISO and national standards for complementary requirements (threads, materials, testing).

Q: What are the key keywords?

A: aerospace, anchor nut, two‑lug, floating, self‑aligning, self‑locking, MJ thread, dimensions, fastener classifications.