JIS B 2401-2-2012 errata 2013 PDF

Full title and description

St JIS B 2401-2:2012 — O‑Rings — Part 2: Housing dimensions and sizes (with errata issued 2013). This document specifies the shapes and dimensional details of housings (grooves) intended for O‑rings used in general machinery, including provisions for use with or without back‑up (anti‑extrusion) rings.

Abstract

This standard gives standardized housing (groove) geometries and dimensional series for O‑rings to ensure correct fit, sealing performance and interchangeability in mechanical designs. The 2012 edition (JIS B 2401‑2:2012) was published 21 March 2012 and a formal errata (corrections) was issued in 2013.

General information

• Status: Current / Active (2012 edition with errata 2013; reaffirmed in later record entries).
• Publication date: 21 March 2012 (JIS B 2401‑2:2012).
• Publisher: Japanese Standards Association (JSA).
• ICS / categories: 23.100.60 (Filters, seals and contamination of fluids); 83.140.50 (Seals).
• Edition / version: 2012 edition — JIS B 2401‑2:2012 (errata published 2013; errata record dated around August–September 2013).
• Number of pages: 60 pages (typical PDF/page count reported by standards distributors).

Scope

Specifies the shapes, nominal dimensions and tolerances for housings (grooves) that receive O‑rings in general machinery applications. It covers groove forms for static and dynamic uses, dimensions for specified size series and notes on use with back‑up (anti‑extrusion) rings; it is intended to ensure interchangeability and correct sealing performance when used with O‑rings conforming to JIS B 2401‑1. The 2012 edition contains editorial and technical content corrected by the 2013 errata.

Key topics and requirements

• Standardized housing/groove geometries and dimension tables for O‑ring sizes (P, G, S, V series).
• Tolerances and dimensional limits for groove widths, depths and edge clearances to ensure proper squeeze and compression of O‑rings.
• Design guidance for use with back‑up (anti‑extrusion) rings and recommendations for preventing extrusion in high‑pressure applications.
• Reference cross‑section (CS) and inside diameter (ID) series for common JIS O‑ring sizes and their identification codes.
• Compatibility with related JIS parts (see related standards) and notes where corrections in the 2013 errata affect dimensional tables or annexes.

Typical use and users

Used by mechanical design engineers, sealing and component manufacturers, quality engineers, procurement/specification teams and technical libraries. Common applications include hydraulic and pneumatic equipment, general machinery sealing points, and design of mating parts that incorporate O‑ring grooves. The standard is used when specifying groove geometry for new designs or verifying existing groove tolerances for interchangeability.

Related standards

Directly associated with other parts of the JIS B 2401 series (Part 1: O‑rings; Part 3: Quality acceptance criteria; Part 4: Anti‑extrusion/back‑up rings). It is also used alongside international O‑ring guidance (for example ISO O‑ring guidance and related ISO groove design documents) when cross‑referencing metric O‑ring sizes and tolerances.

Keywords

JIS B 2401‑2, O‑ring, housing dimensions, groove design, back‑up ring, anti‑extrusion, O‑ring sizes, JIS errata 2013, sealing, groove tolerances.

FAQ

Q: What is this standard?

A: JIS B 2401‑2:2012 is the Japanese Industrial Standard that defines housing (groove) shapes and dimensions for O‑rings used in general machinery; an errata document correcting the 2012 edition was published in 2013.

Q: What does it cover?

A: It covers dimensional tables, tolerances, groove shapes and guidance for using O‑rings with or without back‑up rings to achieve reliable sealing and interchangeability. The errata corrects specific typographical or dimensional errors from the 2012 publication.

Q: Who typically uses it?

A: Mechanical designers, seal and O‑ring manufacturers, quality and inspection personnel, and procurement/specification engineers who need standardized groove dimensions for design, manufacture and acceptance.

Q: Is it current or superseded?

A: The 2012 edition is the published edition for Part 2; records show an official errata issued in 2013 and the document is listed as active/current in standards catalogues (with later reaffirmation entries in repository histories). Users should check the publisher’s catalogue for any subsequent amendments or newer editions before final specification.

Q: Is it part of a series?

A: Yes — JIS B 2401 is a multipart standard. Relevant companion parts include JIS B 2401‑1 (O‑rings), JIS B 2401‑3 (quality acceptance criteria) and JIS B 2401‑4 (anti‑extrusion/back‑up rings).

Q: What are the key keywords?

A: O‑ring, groove/housing dimensions, back‑up ring, anti‑extrusion, JIS B 2401‑2, errata 2013, sealing design, cross‑section (CS), inside diameter (ID).