JIS B 2401-1-2012 PDF

Full title and description

JIS B 2401-1:2012 — O-rings — Part 1: O-rings. This Japanese Industrial Standard defines the form, nominal dimensions, tolerances, appearance and related designation matters for O‑rings used in general machinery applications (including dynamic, static and vacuum‑flange uses).

Abstract

This part of JIS B 2401 establishes the dimensional series, basic cross‑sectional sizes, identification and general requirements for elastomeric O‑rings intended for sealing in hydraulic, pneumatic and other mechanical systems. It is harmonized with the corresponding international guidance (see relationship to ISO 3601 series) and is one part of a multipart set covering housing/groove dimensions, quality acceptance and anti‑extrusion (back‑up) rings.

General information

• Status: Current / Active (2012 edition; listings indicate the 2012 edition is in force and has an erratum and later reaffirmation entries).
• Publication date: 21 March 2012 (publication records for related listings also note early‑2012 entries; errata and administrative dates appear in 2013 and a reaffirmation entry in 2016).
• Publisher: Japanese Standards Association (JSA) / Japanese Industrial Standards (JIS) publishing system.
• ICS / categories: 23.100.60 (Filters, seals and contamination of fluids); 83.140.50 (Seals).
• Edition / version: 2012 edition (JIS B 2401 series reorganized into multiple parts in 2012: parts 1, 2, 3 and 4).
• Number of pages: Approximately 51–52 pages (publisher catalogue listings report 51–52 pages depending on the distributor).

Sources for the bibliographic and status details above: JIS catalogue/distributor entries and standards catalogue listings.

Scope

Specifies the shapes, nominal dimensions, allowable tolerances, appearance criteria and marking/identification conventions for O‑rings used in general machinery — specifically addressing O‑rings for dynamic applications (P), static applications (G) and vacuum flange applications (V). It provides the dimensional series and basic cross‑section sizes that manufacturers and designers use when selecting and specifying O‑ring seals.

Key topics and requirements

• Definition of O‑ring types and series (dynamic P, static G, vacuum V) and their intended applications.
• Nominal dimensions and cross‑section series with associated tolerances and class designations.
• Appearance and marking/identification requirements for manufactured O‑rings.
• References to test/conditioning procedures and related JIS/K test standards for elastomeric materials.
• Normative connection and degree of correspondence with relevant ISO documents (notably the ISO 3601 series).

Typical use and users

Used by seal and component designers, hydraulic and pneumatic equipment engineers, quality and procurement teams, O‑ring manufacturers, and maintenance/specification engineers who need standardized O‑ring dimensions and identification for product design, procurement and interchangeability in industrial and vacuum applications.

Related standards

JIS B 2401 is a multipart standard series. Relevant related parts include JIS B 2401‑2 (housing dimensions and sizes), JIS B 2401‑3 (quality acceptance criteria) and JIS B 2401‑4 (anti‑extrusion / back‑up rings). The series aligns with ISO 3601 series documents for O‑ring dimensions and acceptance criteria.

Keywords

JIS B 2401, O‑ring, seal, elastomer, dimensions, tolerances, back‑up ring, housing/groove, quality acceptance, ISO 3601.

FAQ

Q: What is this standard?

A: JIS B 2401‑1:2012 is the Japanese Industrial Standard that defines O‑ring shapes, nominal dimensions, tolerances, appearance and identification for general machinery sealing applications.

Q: What does it cover?

A: It covers the dimensional series and general requirements for O‑rings (dynamic, static and vacuum flange types), including cross‑section sizes, tolerances and marking; complementary parts of the series cover housing/groove dimensions, quality acceptance and back‑up rings.

Q: Who typically uses it?

A: Seal designers, hydraulics/pneumatics engineers, O‑ring manufacturers, procurement and QA personnel, and maintenance engineers specifying or replacing O‑ring seals in industrial equipment.

Q: Is it current or superseded?

A: The 2012 edition is the published edition in force in the JIS catalogue entries consulted; listings also show administrative errata and later reaffirmation notes (e.g., erratum entries in 2013 and a reaffirmation entry). Users should check the official JIS/JSA catalogue for any subsequent revisions or withdrawals before relying on the standard for regulatory or safety‑critical work.

Q: Is it part of a series?

A: Yes — JIS B 2401 is a multipart standard. Part 1 is the general O‑ring specification; Part 2 covers housing dimensions and sizes; Part 3 covers quality acceptance criteria; Part 4 covers anti‑extrusion (back‑up) rings.

Q: What are the key keywords?

A: O‑ring, seal, elastomer, cross‑section, tolerance, JIS B 2401, housing/groove, anti‑extrusion, quality acceptance, ISO 3601.