ISO 7043-2012 PDF

Full title and description

Prevailing torque type hexagon nuts with flange (with non‑metallic insert), style 2 — Product grades A and B. This International Standard specifies the characteristics, dimensions and mechanical/property class requirements for metric prevailing‑torque hexagon nuts with flange incorporating a non‑metallic insert (style 2) for use with coarse‑thread sizes M5 through M20 and product grades A and B as appropriate.

Abstract

ISO 7043:2012 defines the form, fit and functional requirements for prevailing‑torque hexagon flange nuts with a non‑metallic insert (style 2). It covers thread sizes M5–M20, designates product grade A for threads up to and including M16 and product grade B for threads above M16, and applies to nuts made to property classes 8, 9 and 10. The standard also notes that the nut dimensions correspond to those given in ISO 4161 and references other relevant ISO standards for thread and material specifications.

General information

• Status: Published / current (confirmed review in 2022).
• Publication date: September 2012 (Edition 3, 2012‑09).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 21.060.20 (Fasteners — nuts).
• Edition / version: Edition 3 (2012).
• Number of pages: 7 pages (original English edition).

Key bibliographic details above are taken from the ISO bibliographic record for ISO 7043:2012.

Scope

This standard specifies the characteristics of prevailing torque type hexagon nuts with flange (with non‑metallic insert), style 2, covering coarse metric threads from nominal diameter M5 through M20 inclusive; it defines product grade A for threads up to and including M16 and product grade B for threads above M16, and applies to nuts in property classes 8, 9 and 10. The standard states that the nut dimensions correspond to ISO 4161 and points users to other ISO standards for additional thread and material requirements.

Key topics and requirements

• Definition and application of prevailing‑torque hexagon flange nuts with non‑metallic insert (style 2).
• Thread size range: M5 to M20 (coarse pitches) and assignment of product grades A and B by nominal diameter.
• Mechanical/property class requirements (property classes 8, 9 and 10) and relevant mechanical performance expectations for those classes.
• Dimensional specifications aligned with ISO 4161, with additional features to provide prevailing torque (insert geometry and fit).
• Normative and informative references for complementary requirements (ISO thread standards, material/property standards and inspection/tolerance standards).

Typical use and users

Engineers, fastener designers and manufacturers, procurement and quality assurance personnel, and maintenance teams use ISO 7043:2012 when specifying or producing prevailing‑torque hexagon flange nuts with non‑metallic inserts for mechanical assemblies where vibration resistance or prevailing torque retention is required. It is also used by test laboratories and conformity assessment bodies when verifying that supplied fasteners meet the specified dimensional and mechanical criteria.

Related standards

ISO 7043:2012 references and is commonly used alongside several other ISO standards, including ISO 4161 (nut dimensions), ISO 261 and ISO 724 (metric thread designations and pitches), ISO 898‑2 (mechanical properties of nuts), ISO 965‑2 (tolerances for threads), ISO 2320 (prevailing torque type nuts — test procedures) and ISO 4759‑1 (tolerance classes and inspection). It also replaces earlier editions ISO 7043:1997 and ISO 7043:1983.

Keywords

prevailing torque nut, hexagon nut with flange, non‑metallic insert, style 2, product grade A, product grade B, metric threads M5–M20, property class 8, 9, 10, fasteners, ISO 7043

FAQ

Q: What is this standard?

A: ISO 7043:2012 is an International Standard that specifies the characteristics and dimensional/mechanical requirements for prevailing‑torque hexagon nuts with flange incorporating a non‑metallic insert (style 2), for metric coarse threads M5 through M20.

Q: What does it cover?

A: It covers nut form, dimensional limits, product grade assignment (A and B by diameter ranges), applicable property classes (8, 9 and 10) and references to complementary ISO thread and test standards; it ensures interchangeability and performance expectations for prevailing‑torque flange nuts with non‑metallic inserts.

Q: Who typically uses it?

A: Fastener manufacturers, mechanical and design engineers, purchasing/specification teams, quality/control laboratories and maintenance professionals use this standard when producing, specifying, purchasing or testing prevailing‑torque flange nuts.

Q: Is it current or superseded?

A: ISO 7043:2012 (Edition 3) is the current published edition; the ISO bibliographic record shows the standard was published in September 2012 and that this version was reviewed and confirmed (remained current) during ISO’s 2022 review cycle. It replaced the 1997 and 1983 editions.

Q: Is it part of a series?

A: It is a stand‑alone ISO standard for a specific fastener type but is routinely used together with related ISO standards that govern metric thread definitions, tolerances, material/mechanical properties and test methods (for example ISO 4161, ISO 261, ISO 724, ISO 898‑2, ISO 965‑2, ISO 2320 and ISO 4759‑1).

Q: What are the key keywords?

A: Prevailing‑torque nut, flange nut, non‑metallic insert, hexagon nut, M5–M20, product grade A, product grade B, property class 8/9/10.