ISO 3412-1992 PDF

Full title and description

ISO 3412:1992 — Road vehicles — Screened and waterproof spark-plugs and their connections — Types 1A and 1B. This International Standard specifies the essential dimensional characteristics and connector interfaces for screened and waterproof spark-plugs of types 1A and 1B intended for spark‑ignition engines, including thread and connector diameters and reference shapes.

Abstract

Defines the main dimensional requirements for screened and waterproof spark‑plugs (types 1A and 1B) and their mating connections. The standard tabulates major, pitch and minor thread diameters for plug and connector threads and includes a figure showing plug shapes and the reference quantities relevant for interchangeability and mating between plug and connection.

General information

• Status: Published (confirmed by ISO periodic review).
• Publication date: 17 December 1992 (Edition 3, 1992).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 43.060.50 — Electrical and electronic equipment; road-vehicle components.
• Edition / version: Edition 3 (1992).
• Number of pages: 3.

Scope

This standard applies to screened and waterproof spark‑plugs of types 1A and 1B used with spark‑ignition engines and specifies the principal dimensional characteristics of the plugs and their connections. It ensures mechanical and dimensional interchangeability between the plug body and connector parts by giving thread sizes and reference dimensions; it does not specify performance tests or electrical characteristics beyond the mechanical/connection details.

Key topics and requirements

• Dimensional specification of spark‑plug thread (major, pitch and minor diameters).
• Dimensional specification of connector thread and mating features.
• Reference shapes and schematic figure(s) showing critical reference quantities.
• Requirements intended to ensure mechanical interchangeability and correct mating of screened, waterproof plugs of types 1A and 1B.
• Normative cross‑references to related ISO automotive spark‑plug housing and seating standards.

Typical use and users

Used by automotive manufacturers, spark‑plug and connector component producers, aftermarket parts manufacturers, technical design engineers, quality and conformity assessment laboratories, and standards committees to ensure dimensional compatibility and interchangeability of screened, waterproof spark‑plugs and mating connectors.

Related standards

Normative and related references typically cited with ISO 3412:1992 include ISO 1919 (M14 × 1,25 spark‑plugs with flat seating), ISO 2345 (M18 × 1,5 spark‑plugs with conical seating) and ISO 2346 (compact spark‑plugs M14 × 1,25); the earlier version ISO 3412:1979 was withdrawn and replaced by ISO 3412:1992.

Keywords

ISO 3412, spark‑plug, screened spark‑plug, waterproof spark‑plug, spark‑ignition engine, thread dimensions, connector thread, interchangeability, type 1A, type 1B, automotive components.

FAQ

Q: What is this standard?

A: ISO 3412:1992 is an International Standard that specifies the essential dimensional characteristics and connector interfaces for screened and waterproof spark‑plugs of types 1A and 1B used on spark‑ignition engines.

Q: What does it cover?

A: It covers the principal dimensional requirements (major, pitch and minor thread diameters), reference shapes and connector mating features needed to ensure mechanical interchangeability of screened and waterproof spark‑plugs and their connections. It does not set electrical performance test methods or engine performance requirements.

Q: Who typically uses it?

A: Automotive OEMs, spark‑plug and connector manufacturers, part suppliers, design and production engineers, conformity assessment bodies and standards committees involved in vehicle electrical component interfaces.

Q: Is it current or superseded?

A: ISO 3412:1992 (Edition 3, published 17 December 1992) replaced the 1979 edition. The 1992 edition remains the published ISO document for types 1A and 1B spark‑plugs and has been subject to ISO's periodic confirmation reviews; it is not shown as withdrawn.

Q: Is it part of a series?

A: It is part of a family of ISO documents addressing spark‑plug dimensions and seating (for example ISO 1919, ISO 2345 and ISO 2346) and falls under the work of ISO/TC 22 (road vehicles), specifically subcommittee SC 32 on electrical/electronic components.

Q: What are the key keywords?

A: Spark‑plug, screened, waterproof, connector, thread dimensions, interchangeability, type 1A, type 1B, automotive, ISO 3412.