JIS B 2401-2-2012 PDF

Full title and description

St JIS B 2401-2-2012 — O‑Rings — Part 2: Housing dimensions and sizes. This Japanese Industrial Standard specifies the shapes and dimensional requirements for housings (grooves) designed to receive O‑rings used in general machinery applications, including provisions for use with or without back‑up rings.

Abstract

This part of JIS B 2401 defines the geometry, dimensional tables and tolerances for O‑ring housings (groove forms and sizes) intended for general industrial sealing applications. It provides standardised housing profiles and size codes so designers and manufacturers can ensure correct fit, performance and interchangeability of metric O‑rings and related back‑up ring arrangements.

General information

• Status: Current / Active.
• Publication date: 21 March 2012 (JIS B 2401 series issued 2012; errata and reaffirmation entries recorded subsequently).
• Publisher: Japanese Standards Association (JSA).
• ICS / categories: 23.100.60 (Filters, seals and contamination of fluids); 83.140.50 (Seals).
• Edition / version: 2012 (Part of the JIS B 2401:2012 family of O‑ring standards).
• Number of pages: 60.

Scope

Specifies the shapes, dimensional values and permissible tolerances for housings (grooves) designed to accept the O‑rings defined in the JIS B 2401 series. The scope covers common static and dynamic housing arrangements used in general machinery and industrial equipment, and includes dimensions for housings used with back‑up rings where applicable. It is intended to enable consistent design and manufacture of O‑ring housings for compatibility with the JIS B 2401 O‑ring size series.

Key topics and requirements

• Standardised housing (groove) profiles and nominal dimensions for O‑rings.
• Dimensional tables that map housing dimensions to O‑ring size codes (metric series such as P, G, S, V in JIS practice).
• Tolerances and allowable variations for groove widths, depths and corner radii to ensure functional sealing and interchangeability.
• Guidance for use of back‑up rings and for selecting appropriate housing geometry for static versus dynamic service.
• References to related parts of JIS B 2401 (O‑ring sizes and other parts of the series) and normative references for design practice.

Typical use and users

Used by mechanical design engineers, seal manufacturers, component suppliers, quality engineers and maintenance teams involved in hydraulic, pneumatic and general machinery equipment design. Typical applications include selection and specification of groove geometry in cylinders, flanges, valves, fittings and other assemblies where O‑ring seals are required. The standard supports designers aiming for interchangeability and predictable sealing performance.

Related standards

Closely related to other parts of the JIS B 2401 series (for example Part 1 — O‑ring sizes and Part 3/4 where applicable). It also updates or replaces earlier JIS documents covering O‑ring housings and design criteria; several older JIS B documents were superseded when the 2012 multi‑part JIS B 2401 series was issued. For groove design guidance and complementary dimensions consult the rest of JIS B 2401 and referenced JIS items.

Keywords

JIS B 2401‑2, O‑ring, housing dimensions, groove profile, seal groove, back‑up ring, metric O‑ring, JSA, JIS, sealing standard.

FAQ

Q: What is this standard?

A: JIS B 2401‑2:2012 is the Japanese Industrial Standard part that defines housing (groove) dimensions and sizes for O‑rings used in general machinery applications.

Q: What does it cover?

A: It covers standard groove geometries, dimensional tables, tolerances and guidance for housings intended to receive JIS‑specified O‑rings, including provisions for use with back‑up rings.

Q: Who typically uses it?

A: Mechanical and design engineers, seal and component manufacturers, procurement and quality personnel, and maintenance staff working with hydraulic, pneumatic and general industrial equipment.

Q: Is it current or superseded?

A: The 2012 edition is listed as the active/current part for JIS B 2401‑2; errata and reaffirmation actions associated with the 2012 release have been recorded in subsequent administrative entries. Users should check with the publisher (JSA) for any amendments or newer revisions before relying on the standard for safety‑critical design.

Q: Is it part of a series?

A: Yes — it is Part 2 of the multi‑part JIS B 2401 series (2012) covering O‑rings; other parts in the series cover O‑ring sizes, materials and related design criteria.

Q: What are the key keywords?

A: O‑ring, groove, housing dimensions, back‑up ring, JIS B 2401, JSA, metric O‑ring sizes, seal design.