SAE AMS4520M-2021 PDF

Full title and description

SAE AMS4520M-2021 — Leaded Phosphor Bronze Strip 88.5Cu - 4.0Sn - 4.0Pb - 3.0Zn - 0.26P, Cold Rolled, Half Hard (H02). This aerospace material specification defines the chemical composition, temper, form (strip), and general acceptance requirements for the specified leaded phosphor bronze alloy.

Abstract

AMS4520M is an SAE (AMS) material specification that covers a single leaded phosphor bronze alloy supplied as cold‑rolled strip in a half‑hard temper (H02). The document provides alloy chemistry limits, mechanical/physical requirements for the H02 temper, dimensional/form tolerances for strip product, and typical inspection/testing and certification requirements used by aerospace and related industries. The 2021 "M" revision is the latest published revision of the AMS4520 series.

General information

• Status: Revised / Current (revision AMS4520M).
• Publication date: April 28, 2021 (AMS4520M revision published 04/28/2021).
• Publisher: SAE International (Aerospace Material Specification - AMS).
• ICS / categories: Aerospace materials; Nonferrous alloys; Copper alloys; Material specifications (AMS).
• Edition / version: AMS4520M (2021 revision, designation "M").
• Number of pages: 5 pages (typical AMS4520M document length).

Scope

This specification covers a copper‑based alloy (leaded phosphor bronze) furnished in the form of cold‑rolled strip and specified in the half‑hard temper (H02). It establishes the alloy’s chemical composition limits, required mechanical properties and temper, dimensional and form tolerances for strip, and inspection/acceptance criteria used for purchase and quality assurance in aerospace and related industries.

Key topics and requirements

• Chemical composition: leaded phosphor bronze with nominal composition 88.5% Cu, 4.0% Sn, 4.0% Pb, 3.0% Zn, 0.26% P (composition limits and analysis requirements specified in the standard).
• Product form and temper: cold‑rolled strip supplied half‑hard (H02) with specified mechanical properties for that temper.
• Mechanical and physical requirements: tensile/elongation/other mechanical acceptance criteria appropriate to H02 temper (as defined in the text of the AMS).
• Dimensional tolerances and surface condition: strip width, thickness and edge/flatness tolerances and acceptable surface conditions for aerospace use.
• Inspection, testing and certification: chemical analysis, mechanical testing, sampling plans, and supplier certification/traceability requirements for AMS compliance.
• Packaging and marking: requirements to preserve material condition and provide identification and traceability to the AMS4520M specification.

Typical use and users

The standard is used by aerospace OEMs, suppliers and procurement organizations specifying bronze strip for components such as electrical contacts, bearings, bushings, springs, shims, and other formed parts where leaded phosphor bronze properties (good formability, bearing/sliding characteristics, and machinability) are required. Typical users include materials engineers, purchasing agents, quality/inspection departments, and manufacturers of nonferrous strip products.

Related standards

AMS4520M is part of the AMS family for nonferrous alloys (issued under the AMS D Nonferrous Alloys Committee) and follows the historical AMS4520 series (earlier revisions A through L). Related documents include other AMS and industry specifications covering bronze and copper alloys, as well as applicable test method standards for chemical analysis and mechanical testing used in aerospace procurement.

Keywords

SAE AMS4520M, AMS4520, leaded phosphor bronze, bronze strip, copper alloy, cold rolled strip, H02, half‑hard, chemical composition, aerospace material specification, SAE International.

FAQ

Q: What is this standard?

A: SAE AMS4520M-2021 is an aerospace material specification that defines the requirements for a leaded phosphor bronze alloy supplied as cold‑rolled strip in a half‑hard condition.

Q: What does it cover?

A: It covers alloy chemistry, temper/mechanical requirements for H02 (half‑hard), dimensional and form tolerances for strip, inspection and testing requirements, and supplier certification/traceability needed for purchase and acceptance.

Q: Who typically uses it?

A: Aerospace OEMs and suppliers, materials and procurement engineers, quality and inspection teams, and manufacturers of nonferrous strip and formed components (electrical contacts, springs, bearings, shims, etc.).

Q: Is it current or superseded?

A: The AMS4520M revision (designated "M") is the current revision published in 2021 and supersedes earlier revisions (for example AMS4520L and prior). Publication/revision information is shown on the SAE AMS record.

Q: Is it part of a series?

A: Yes — AMS4520M is part of the AMS4520 series (historical revisions A through L) and is managed under SAE’s AMS (Aerospace Material Specification) system by the AMS D Nonferrous Alloys Committee.

Q: What are the key keywords?

A: Leaded phosphor bronze, copper alloy, strip, cold rolled, H02, half‑hard, AMS4520M, SAE, aerospace material specification.