ISO 10512-2025 PDF

Full title and description

ISO 10512:2025 — Fasteners — Prevailing torque hexagon nuts — Regular nuts (with non‑metallic insert), with fine pitch thread. This International Standard specifies dimensions, mechanical characteristics and requirements for prevailing‑torque hexagon regular nuts with a non‑metallic insert, intended for metric fine pitch thread sizes from 8 mm to 39 mm, in steel and stainless steel, and in product grades A and B.

Abstract

This edition (Edition 3, 2025) defines the characteristics of prevailing‑torque hexagon regular nuts (with non‑metallic insert) in steel and stainless steel with metric fine pitch thread 8 mm to 39 mm, and product grades A and B. It explains the dimensional relationship between overall nut height and the prevailing‑torque feature and references ISO 898‑2 and ISO 8673 for related dimensional/property specifications.

General information

• Status: Published.
• Publication date: June 2025 (Edition 3 published June 2025; commonly listed as 13 June 2025 in commercial catalogs).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 21.060.20 (Fasteners).
• Edition / version: Edition 3 (2025).
• Number of pages: 6 pages (concise technical standard).

Scope

ISO 10512:2025 specifies the characteristics and requirements for prevailing‑torque type hexagon regular nuts with a non‑metallic insert and metric fine pitch threads from nominal diameters 8 mm up to 39 mm. It covers material types (steel and stainless steel), product grades A and B, dimensional criteria (including overall nut height and height of the prevailing‑torque feature), and references relevant property classes and stainless‑steel grades that may be selected from ISO 898‑2 or ISO 3506‑2 where applicable. The document supersedes the 2012 edition.

Key topics and requirements

• Definition and dimensions for prevailing‑torque hexagon regular nuts with a non‑metallic insert (fine pitch threads, 8 mm–39 mm).
• Product grading: product grade A and product grade B designations and applicability by diameter.
• Dimensional relationship between m_min (baseline nut height) and the added prevailing‑torque feature; guidance referencing ISO 898‑2 and ISO 8673.
• Materials: permitted steel and stainless‑steel options and reference to selections from ISO 3506‑2 for stainless grades.
• Conformity and application notes for cases where alternate specifications are requested.

Typical use and users

Used by fastener manufacturers, mechanical design and application engineers, procurement and quality assurance teams in automotive, aerospace, machinery and general engineering sectors, and by standards committees and conformity assessment bodies that specify or verify threaded fastener components. The standard is appropriate for designers specifying prevailing‑torque locking nuts where fine pitch metric threads are required.

Related standards

Key referenced and related standards include ISO 898‑2 (mechanical properties of nuts – product grades), ISO 8673 (dimensional references for certain nut styles), ISO 3506‑2 (mechanical properties of corrosion‑resistant stainless steel fasteners), and the previous edition ISO 10512:2012 which this 2025 edition replaces.

Keywords

prevailing torque nut, hexagon nut, non‑metallic insert, fine pitch thread, metric threads, fasteners, ISO 10512, product grade A, product grade B, nut dimensions, mechanical properties.

FAQ

Q: What is this standard?

A: ISO 10512:2025 is an International Standard that defines the characteristics, dimensions and requirements for prevailing‑torque hexagon regular nuts with a non‑metallic insert for metric fine pitch threads.

Q: What does it cover?

A: It covers dimensional specifications, applicable thread diameters (8 mm–39 mm), product grades (A and B), permitted materials (steel and stainless steel), and references other ISO standards for property classes and related dimensions.

Q: Who typically uses it?

A: Fastener manufacturers, design and application engineers, procurement and QA personnel across industries that require locking hexagon nuts with fine pitch threads, plus standards bodies and test laboratories.

Q: Is it current or superseded?

A: Current — ISO 10512:2025 (Edition 3) was published in June 2025 and replaces the earlier ISO 10512:2012 edition.

Q: Is it part of a series?

A: It is part of the family of ISO fastener standards (ICS 21.060.20) and is cross‑referenced with other ISO documents on fastener dimensions and mechanical properties such as ISO 898‑2, ISO 8673 and ISO 3506‑2.

Q: What are the key keywords?

A: Prevailing‑torque nut, hexagon nut, non‑metallic insert, fine pitch, metric thread, fasteners, product grade, ISO 10512.