SAE AS3625B-2024 PDF
Name in English:
St SAE AS3625B-2024
Name in Russian:
Ст SAE AS3625B-2024
Original standard SAE AS3625B-2024 in PDF full version. Additional info + preview on request
Full title and description
SAE AS3625B-2024 — NUT, SELF-LOCKING, DOUBLE HEXAGON, REDUCED ENVELOPE, UNS S66286; silver‑plated threads only. This aerospace technical standard defines the requirements for a reduced‑envelope, self‑locking double‑hexagon nut manufactured from UNS S66286 (A‑286) with silver‑plated threads and intended for aerospace propulsion and related fastener applications.
Abstract
AS3625B specifies geometry, material, plating, and key performance/acceptance criteria for a self‑locking double‑hexagon nut with a reduced envelope, restricted to UNS S66286 (A‑286) material and silver‑plated threads. The document is short (technical data sheet length) and is intended to provide procurement, manufacturing and inspection requirements for this specific fastener type used in aerospace propulsion and structural assemblies.
General information
- Status: Reaffirmed (AS3625B).
- Publication date: Reaffirmed April 10, 2024 (AS3625B revision date shown as 2024‑04‑10 / published 1 April 2024 in supplier listings).
- Publisher: SAE International (SAE Mobilus / SAE standards program).
- ICS / categories: Fasteners — Nuts (ICS 21.060.20) and Aerospace fasteners (ICS 49.030.30).
- Edition / version: AS3625B (current reaffirmation 2024). Historical versions: AS3625 (2011), AS3625A (2012).
- Number of pages: 3 pages (technical standard / data sheet length).
Scope
This standard covers the definition, allowable material (UNS S66286 / A‑286), thread plating requirement (silver plated threads only), and the essential form and functional features of the self‑locking, double‑hexagon, reduced‑envelope nut used in aerospace propulsion and related applications. It is focused on a single fastener type and is intended for use in procurement, manufacturing, incoming inspection and acceptance of parts meeting the specified configuration and material requirements.
Key topics and requirements
- Designation and exact product title: NUT, SELF‑LOCKING, DOUBLE HEXAGON, REDUCED ENVELOPE (AS3625B).
- Material requirement: UNS S66286 (A‑286) — precipitation‑hardenable high‑strength alloy suitable for elevated/cryogenic temperature service.
- Plating/coating: silver‑plated threads only (thread plating specified as silver in the standard title).
- Geometry: double‑hexagon configuration with reduced envelope and self‑locking feature (dimensional/profile requirements defined in the standard).
- Inspection/acceptance: expected to include dimensional checks, material/heat‑treatment verification, plating inspection and functional locking performance (standard text provides acceptance criteria).
Typical use and users
Primary users are aerospace OEMs, propulsion system manufacturers, fastener suppliers, quality and procurement engineers, and maintenance organizations specifying or procuring high‑strength, temperature‑resistant locking nuts for engine and airframe applications. The standard is used to ensure consistent form, material and plating for critical fasteners.
Related standards
Related documents in the AS3625 family and SAE fastener documents include the original AS3625 (issued 2011) and AS3625A (revised 2012), with AS3625B as the reaffirmed 2024 release. Other nearby SAE fastener standards (same series) such as AS3623B and similar AS3xxx series standards address related bolt/nut geometries and materials used in aerospace applications.
Keywords
AS3625B, nut, self‑locking, double hexagon, reduced envelope, UNS S66286, A‑286, silver‑plated threads, aerospace fastener, SAE standard, propulsion fasteners
FAQ
Q: What is this standard?
A: SAE AS3625B‑2024 is an SAE technical standard that specifies the requirements for a self‑locking, double‑hexagon, reduced‑envelope nut made from UNS S66286 (A‑286) with silver‑plated threads; the document was reaffirmed in April 2024.
Q: What does it cover?
A: It covers the designation/title, permitted material (UNS S66286 / A‑286), the requirement that threads be silver‑plated, the specific double‑hexagon reduced envelope form with self‑locking function, and associated acceptance/inspection criteria for procurement and quality control.
Q: Who typically uses it?
A: Aerospace and propulsion OEMs, fastener manufacturers and distributors, procurement and quality engineers, and repair/maintenance organizations that need to specify or verify this exact fastener configuration and material for critical aerospace applications.
Q: Is it current or superseded?
A: AS3625B is the current reaffirmed release (reaffirmed April 10, 2024). It supersedes earlier revisions (AS3625 issued June 7, 2011; AS3625A revised April 12, 2012). Users should confirm the latest status/purchase the official SAE document for the definitive text.
Q: Is it part of a series?
A: Yes — it is part of the SAE aerospace fastener standards family (AS36xx series and related AS documents) covering bolts, nuts and other fastener geometries and materials for aerospace applications; related items include AS3625 (previous editions) and nearby AS362x standards.
Q: What are the key keywords?
A: Self‑locking nut, double hexagon, reduced envelope, UNS S66286, A‑286, silver plated threads, aerospace fastener, SAE AS3625B.