ISO 12261-2023 PDF

Full title and description

ISO 12261:2023 — Aerospace — Screws, pan head, internal offset cruciform ribbed or unribbed drive, pitch diameter shank, long length MJ threads, metallic material, coated or uncoated, strength classes less than or equal to 1 100 MPa — Dimensions. This International Standard specifies the dimensional requirements for a family of pan‑head aerospace screws with internal offset cruciform drives and long MJ threads, intended for metallic materials with or without coating and for specified strength classes.

Abstract

This document specifies the dimensions of pan head screws with internal offset cruciform ribbed or unribbed drive, pitch diameter shank and long length MJ threads, in metallic material, coated or uncoated, with strength classes less than or equal to 1 100 MPa. It is intended for use in the compilation of aerospace product standards.

General information

• Status: Published.
• Publication date: 2023-11 (Edition 3, published 1 November 2023).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 49.030.20.
• Edition / version: Edition 3 (2023).
• Number of pages: 2.

Key bibliographic and lifecycle details (status, edition, publication date and ICS) are recorded in the ISO registry for this standard.

Scope

Specifies dimensional characteristics for pan‑head screws with an internal offset cruciform drive (ribbed or unribbed), a pitch‑diameter shank and long MJ threads. Applies to metallic materials (coated or uncoated) with strength classes up to 1 100 MPa and is intended for use when compiling aerospace product standards and technical specifications where these fasteners are referenced. The standard replaces the previous 2016 edition.

Key topics and requirements

• Defined nominal dimensions and tolerances for pan‑head screws with internal offset cruciform drives.
• Designation of shank type (pitch‑diameter shank) and long MJ thread form.
• Applicability to metallic materials, both coated and uncoated.
• Strength class limit: materials with strength classes less than or equal to 1 100 MPa.
• Intended use as a dimensional reference for aerospace product standards and related specifications.

Typical use and users

Used by aerospace engineers, fastener designers and manufacturers, component and assembly designers, procurement and quality assurance teams in the aerospace supply chain, and standards authors compiling or referencing fastener dimensions in aerospace product standards and technical drawings.

Related standards

The 2023 edition replaces ISO 12261:2016. Related materials and fastener standards typically referenced alongside this document include other ISO fastener dimension and mechanical property standards (for example standards on thread forms, mechanical properties of fasteners and coating practices) and documents produced by ISO/TC 20/SC 4 (Aerospace fasteners). Users should consult their national adoption documents for harmonized or regulatorily mandated variants.

Keywords

ISO 12261, pan head screw, internal offset cruciform drive, MJ thread, pitch diameter shank, aerospace fasteners, screw dimensions, strength class ≤ 1100 MPa.

FAQ

Q: What is this standard?

A: ISO 12261:2023 is an International Standard that defines the dimensional requirements for a specific family of pan‑head aerospace screws with internal offset cruciform drives and long MJ threads.

Q: What does it cover?

A: It covers the nominal dimensions, tolerances and applicability (material/coating and strength class limits) for the specified screw type so they can be consistently referenced in aerospace product standards and technical documentation.

Q: Who typically uses it?

A: Aerospace designers, fastener manufacturers, procurement and quality teams, standards authors and any organization that specifies or procures these types of screws for aerospace applications.

Q: Is it current or superseded?

A: Current — ISO 12261:2023 (Edition 3, published November 2023) is the active edition and replaces ISO 12261:2016.

Q: Is it part of a series?

A: It is one of the aerospace fastener dimension standards maintained under ISO/TC 20/SC 4. While not a numbered multi‑part series itself, it is related conceptually to other ISO standards that cover fastener dimensions, thread forms and mechanical properties used in aerospace engineering.

Q: What are the key keywords?

A: Pan head, internal offset cruciform drive, ribbed, MJ thread, pitch diameter shank, aerospace fastener, dimensions, strength class 1100 MPa.