SAE AMS6371M-2022 PDF

Full title and description

SAE International — AMS6371M: Steel, Mechanical Tubing 0.95Cr - 0.20Mo (0.28 - 0.33C) (SAE 4130). This aerospace material specification defines requirements for aircraft‑quality, low‑alloy chromium‑molybdenum mechanical tubing (commonly referred to as SAE/AISI 4130).

Abstract

AMS6371M specifies chemical composition (nominally ~0.95% Cr, 0.20% Mo, with carbon in the 0.28–0.33% range), general manufacturing forms and finishes for mechanical tubing, and the acceptance tests and mechanical property requirements appropriate for aircraft‑quality 4130 tubing. It provides dimensional, chemical, and mechanical acceptance criteria intended to ensure suitability for structural and mechanical applications in aerospace and related industries.

General information

• Status: Revised (current revision AMS6371M).
• Publication date: October 4, 2022 (AMS6371M revision date).
• Publisher: SAE International (SAE).
• ICS / categories: Metallurgy — Iron and steel products; relevant ICS headings include 77.140 (iron and steel products) and 77.140.75 (steels pipes and tubes for specific use).
• Edition / version: AMS6371M (2022 revision).
• Number of pages: 7 pages (AMS6371M document).

Scope

This specification covers aircraft‑quality, low‑alloy chromium‑molybdenum steel supplied in the form of mechanical tubing. It defines chemical composition limits, manufacturing and finishing conditions, and acceptance tests required to verify conformance for aerospace applications. It is applicable where SAE/AISI 4130 mechanical tubing is required to meet aviation quality and traceability expectations.

Key topics and requirements

• Chemical composition: Chromium ~0.95%, Molybdenum ~0.20%, Carbon range 0.28–0.33% (SAE 4130 alloy basis).
• Mechanical property requirements: tensile and elongation minima, hardness limits and acceptance criteria appropriate for mechanical tubing used in aircraft applications.
• Manufacturing and finishes: permitted tube forms, surface finish/defect acceptance, and any specified heat‑treat or normalization conditions needed to meet property requirements.
• Dimensional and tolerance controls for tubing sizes and wall thicknesses intended for mechanical use.
• Required inspection and testing: chemical analysis, mechanical testing, and applicable nondestructive or destructive tests to demonstrate conformance (as specified in the document).
• Identification, certification, and traceability requirements for aerospace procurement (material certifications and documentary evidence of conformance).

Typical use and users

Users typically include aerospace and defense OEMs, aircraft structural component manufacturers, specialty tubing producers, material procurement and quality engineers, metallurgists, and maintenance/repair organizations requiring traceable 4130 mechanical tubing for structural and mechanical assemblies. The specification is used to procure tubing for landing gear components, control systems, fittings, and other mechanical parts where strength, toughness, and traceability are required.

Related standards

AMS6371M is part of the AMS material specifications covering 4130 (Cr‑Mo) alloy forms. Closely related AMS documents include AMS6370 (4130 — bars, forgings, and rings) and earlier AMS6371 revisions (AMS6371L, AMS6371K, etc.), which AMS6371M supersedes as the 2022 revision. The AMS E Carbon and Low Alloy Steels Committee issues these related AMS documents.

Keywords

AMS6371M, SAE 4130, chromium‑molybdenum steel, mechanical tubing, aircraft‑quality tubing, low‑alloy steel, AMS material specification, tubing acceptance tests, aerospace materials.

FAQ

Q: What is this standard?

A: AMS6371M is an SAE International aerospace material specification that defines requirements for steel mechanical tubing made to the 4130 (Cr‑Mo) alloy composition, intended for aircraft and related uses.

Q: What does it cover?

A: It covers chemical composition, manufacturing/finish conditions, dimensional tolerances, mechanical property minima, and inspection/testing/traceability requirements for aircraft‑quality mechanical tubing of SAE/AISI 4130 composition.

Q: Who typically uses it?

A: Aerospace OEMs, tubing manufacturers, metallurgists, purchasing and quality assurance engineers, and maintenance/repair organizations that require certified 4130 mechanical tubing for structural and mechanical components.

Q: Is it current or superseded?

A: AMS6371M is the current revised edition as of October 4, 2022; it supersedes earlier AMS6371 revisions (for example AMS6371L).

Q: Is it part of a series?

A: Yes — AMS6371 is part of the AMS family of material specifications for carbon and low‑alloy steels maintained by the AMS E Carbon and Low Alloy Steels Committee; related AMS documents address other product forms of the same alloy (for example AMS6370 for bars and forgings).

Q: What are the key keywords?

A: AMS6371M, SAE 4130, chromium‑molybdenum, 0.95Cr 0.20Mo, 0.28–0.33% C, mechanical tubing, aircraft‑quality steel, aerospace material specification.