JIS B 2404-2018 PDF

Full title and description

JIS B 2404:2018 — Dimensions of gaskets for use with pipe flanges. This Japanese Industrial Standard specifies types, forms and dimensional requirements for gaskets intended for use with pipe flanges in fluid piping systems (steam, water, oil, etc.).

Abstract

This standard defines classification, form and precise dimensions for common gasket types used with flanges referenced by JIS B 2220, JIS B 2239, JIS B 2240 and JIS B 2241. It includes requirements and dimensional tables for non‑metallic flat gaskets, spiral‑wound gaskets and PTFE‑envelope gaskets, plus informative annexes (including a comparison to related international dimensions). The standard excludes gaskets corresponding to flanges specified in ISO 7005‑1/2/3.

General information

• Status: Current / in force.
• Publication date: 20 February 2018 (JIS B 2404:2018).
• Publisher: Japanese Standards Association (JSA) — published as a Japanese Industrial Standard (JIS) administered by the Japanese Industrial Standards Committee.
• ICS / categories: 23.040.80 — Seals for pipe and hose assemblies (Mechanical engineering / pipework).
• Edition / version: 2018 (replaces JIS B 2404:2006).
• Number of pages: 33 pages (typical published PDF).

Scope

Specifies the types, classification and dimensional requirements of gaskets for use with pipe flanges specified in the main texts of JIS B 2220, JIS B 2239, JIS B 2240 and JIS B 2241. The standard provides dimensional tables and form definitions for non‑metallic flat gaskets, spiral‑wound gaskets and polytetrafluoroethylene (PTFE) resin envelope gaskets; it is not applicable to gaskets for flanges covered by ISO 7005‑1/2/3. Informative annexes supply reference dimensions and a comparison with corresponding international dimensions.

Key topics and requirements

• Classification and form of gaskets (flat full‑face, flat ring, spiral‑wound, PTFE envelope types).
• Combination rules and fit between specific flange face designs and gasket types.
• Dimensional tables for gasket outer/inner diameters, thicknesses and centring/inner/outer ring dimensions across nominal flange sizes.
• Requirements for spiral‑wound gasket configurations (with/without inner ring, centring ring options).
• Reference annexes: dimensions corresponding to JIS B 2220 Annex E and a JIS-to‑international comparison table.

Typical use and users

Used by mechanical and piping design engineers, flange and gasket manufacturers, piping contractors, plant maintenance personnel, procurement specialists and standards librarians to select, specify and manufacture gaskets that correctly fit JIS‑specified flanges. It is also used as a reference when adapting JIS flange/gasket designs to or from international standards.

Related standards

Commonly referenced together with: JIS B 2220 (pipe flanges), JIS B 2239, JIS B 2240, JIS B 2241 (flange families and details), JIS B 2490 (test methods for sealing behavior), and relevant international standards such as ISO 7005 (flange series) and comparable EN/ASME flange/gasket standards for cross‑reference.

Keywords

gasket; pipe flange; gasket dimensions; spiral‑wound gasket; PTFE envelope; non‑metallic flat gasket; flange sealing; JIS B 2404; flange gasket dimensions.

FAQ

Q: What is this standard?

A: JIS B 2404:2018 is the Japanese Industrial Standard that defines dimensions and classification for gaskets used with pipe flanges in fluid piping systems.

Q: What does it cover?

A: It covers types (flat, spiral‑wound, PTFE envelope), forms and detailed dimensional tables for gaskets that match flanges specified in several JIS flange standards; it also includes informative annexes and a JIS-to‑international comparison. It excludes gaskets for flanges covered by ISO 7005‑1/2/3.

Q: Who typically uses it?

A: Piping and mechanical engineers, gasket and flange manufacturers, maintenance and inspection teams, and procurement/specification writers who need precise gasket dimensions to ensure correct flange sealing and interchangeability.

Q: Is it current or superseded?

A: JIS B 2404:2018 is the current edition published 20 February 2018; it revises and replaces JIS B 2404:2006. Users should check with JSA/JISC or national catalogues for any later amendments.

Q: Is it part of a series?

A: Yes — it is part of the JIS B family of standards addressing pipe flanges and related components; it is intended to be used alongside JIS flange standards such as JIS B 2220, B 2239, B 2240 and B 2241.

Q: What are the key keywords?

A: Gasket, flange, pipe flange, dimensions, spiral‑wound, PTFE envelope, non‑metallic flat gasket, JIS B 2404.