ISO 7089-2000 PDF

Full title and description

ISO 7089:2000 — Plain washers — Normal series — Product grade A. International standard specifying dimensions, tolerances, hardness classes and technical delivery conditions for normal-series plain (flat) washers of product grade A for nominal thread diameters from 1.6 mm to 64 mm.

Abstract

This standard defines the geometry, dimensional tolerances and technical requirements for plain washers of the normal series (product grade A). It covers preferred and non‑preferred sizes, clearance‑hole diameters, outside diameters, thicknesses and relevant hardness classes (200 HV and 300 HV), and indicates typical suitability of the two hardness classes for use with specified fastener property classes.

General information

• Status: Published (confirmed at last systematic review).
• Publication date: June 2000 (Edition 2, 2000-06).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 21.060.30 (Washers, locking elements).
• Edition / version: Edition 2 (2000).
• Number of pages: 5 (ISO edition document length).

Scope

ISO 7089:2000 specifies the characteristics of normal‑series plain washers, product grade A, in hardness classes 200 HV and 300 HV for nominal thread diameters from 1.6 mm up to and including 64 mm. The standard gives nominal and limiting dimensions for bore (clearance) diameter, outside diameter and thickness, preferred and non‑preferred sizes, tolerance zones and basic technical delivery conditions. It also describes the intended use of the two hardness classes with specified fastener property classes.

Key topics and requirements

• Dimensional data: nominal bore (d_c), outside diameter (D) and thickness (h) for nominal thread diameters 1.6–64 mm (preferred and non‑preferred sizes).
• Tolerances and limits for hole, outside diameter and thickness appropriate to product grade A (normal series).
• Hardness classes: 200 HV and 300 HV and guidance on which fastener property classes they are suitable for.
• Technical delivery conditions including surface condition, removal of burrs and general workmanship.
• Reference to other standards for materials, coating and fastener compatibility (selection of material and corrosion protection not specified in full but cross‑referenced).
• Notes on special cases: selection guidance when clamping soft materials or using large clearance holes; recommendation to consult ISO 887 for other sizes if required.

Typical use and users

Commonly used by washer and fastener manufacturers, mechanical and product designers, purchasing/specification engineers, quality and inspection personnel, and maintenance teams. Typical applications include general mechanical assemblies, construction and machinery where standardized plain washers are required to ensure correct bearing, load distribution and assembly compatibility with specified bolt/nut property classes.

Related standards

Standards commonly referenced together with ISO 7089 include: ISO 887 (selection of sizes), ISO 3506‑1 (mechanical properties of stainless steel fasteners), ISO 3269 (inspection acceptance conditions for fasteners), ISO 4759 (tolerances for fasteners), ISO 10683 and ISO 4042 (surface treatments/chemical passivation), and various national/adopted EN/BS/ANSI designations that reproduce or reference ISO 7089.

Keywords

plain washer, flat washer, normal series, product grade A, ISO 7089, washer dimensions, clearance hole, outside diameter, thickness, hardness 200 HV, hardness 300 HV, fastener compatibility

FAQ

Q: What is this standard?

A: ISO 7089:2000 is an international standard that specifies dimensions, tolerances and technical requirements for normal‑series plain (flat) washers of product grade A for nominal thread diameters 1.6 mm to 64 mm.

Q: What does it cover?

A: It covers nominal sizes (preferred and non‑preferred), clearance (bore) diameters, outside diameters, thicknesses, tolerance limits, hardness classes (200 HV and 300 HV), and technical delivery conditions and guidance on suitability with different fastener property classes.

Q: Who typically uses it?

A: Washer and fastener manufacturers, mechanical designers and engineers, procurement/specification teams, test and quality inspectors, and maintenance personnel who require standardized washer geometry and performance guidance.

Q: Is it current or superseded?

A: ISO 7089:2000 is the published Edition 2 (June 2000) and was confirmed at systematic review. As of the latest committee lifecycle information, the standard remains the published edition but is listed in ISO records for revision activity (a committee draft process has been recorded). Users should check for any newer revisions or national adoptions before final specification.

Q: Is it part of a series?

A: Yes — ISO 7089 addresses the normal series, product grade A, of plain washers. Other related ISO documents cover different washer series, chamfered/plain variants, or reference material and treatment requirements; ISO 887 is used for extended size selections and other fastener/washers coordination.

Q: What are the key keywords?

A: Plain washer, flat washer, normal series, product grade A, ISO 7089, dimensions, hardness 200 HV, hardness 300 HV, clearance hole, outside diameter, thickness.