GOST 1643-81 PDF

Full title and description

ГОСТ 1643-81 — Основные нормы взаимозаменяемости. Передачи зубчатые цилиндрические. Допуски. (English title: Cylindrical gear pairs — Accuracy / Basic norms of interchangeability: cylindrical gear transmissions — tolerances). This national standard establishes accuracy classes and tolerance limits for involute cylindrical gears and gear pairs used in external and internal meshing, covering spur, helical and herringbone types.

Abstract

GOST 1643-81 (introduced 1 July 1981) sets basic interchangeability norms and dimensional/accuracy tolerance tables for involute cylindrical gear wheels and gear pairs. It defines permissible deviations, accuracy grades and measurement reference conditions for gears with modules, diameters and face-widths within the ranges stated in the standard, and references the basic rack/profile standard GOST 13755-81 for the initial tooth contour. The standard has an amendment recorded in 1984 and has been kept current in national collections.

General information

• Status: Active / in force (document retained in national collections and databases).
• Publication date: 01 July 1981.
• Publisher: State Committee for Standards (Gosstandart) of the USSR — now administered in national standards bodies (catalogued by current national organizations).
• ICS / categories: 21.200 — Gears.
• Edition / version: Original issue 1981; contains an amendment dated 01 October 1984.
• Number of pages: Typically published in full texts of 75 pages in many commercial catalogues (some catalogues list a 45-page extract/translation); common commercial records list 75 pages.

Scope

The standard applies to involute cylindrical gear wheels and gear transmissions in external and internal meshing — spur (straight-tooth), helical and herringbone — with pitch diameters up to 6300 mm, face width or half-herringbone width up to 1250 mm, and tooth modules from 1 mm to 55 mm. It establishes tolerance tables and accuracy grades for various diameter and module ranges and refers to the initial contour definition in GOST 13755-81.

Key topics and requirements

• Definition of accuracy classes (degrees of precision) for cylindrical gear wheels and gear pairs.
• Numerical tolerance tables for profile, helix, runout, cumulative pitch error and composite deviations by diameter and module ranges.
• Permissible deviations for different types of meshing (external vs internal) and for spur, helical and herringbone gears.
• Reference to initial contour and basic rack profile (GOST 13755-81) as the baseline geometry.
• Measurement and inspection conditions and recommended criteria for interchangeability and assembly.

Typical use and users

Engineers and designers of gearboxes and power-transmission equipment, manufacturers of gears and gear-cutting tools, metrology and quality-control laboratories, procurement/specification engineers, and standards bodies use GOST 1643-81 when specifying gear accuracy, tolerances and acceptance criteria for components intended for interchangeability and mass production.

Related standards

Key related documents include GOST 13755-81 (basic rack / initial contour for involute teeth), earlier national gear standards superseded by or referenced in GOST 1643-81 (for example, ГОСТ 1643-72 as a predecessor), and international / regional gear standards used for comparison (for example ISO gear accuracy standards such as ISO 1328 series).

Keywords

GOST 1643-81; cylindrical gears; gear pairs; involute; tolerances; accuracy classes; gear profile; helix; spur gears; helical gears; herringbone gears; interchangeability; GOST 13755-81; ICS 21.200.

FAQ

Q: What is this standard?

A: GOST 1643-81 is a Soviet / national standard titled "Основные нормы взаимозаменяемости. Передачи зубчатые цилиндрические. Допуски" that defines accuracy classes and tolerance limits for involute cylindrical gears and gear pairs (spur, helical, herringbone).

Q: What does it cover?

A: It covers dimensional and accuracy tolerances for cylindrical gears and gear pairs (external and internal meshing), providing tables of permissible deviations by module and pitch diameter, measurement conditions, and references to the basic rack/profile standard (GOST 13755-81). Typical ranges include modules from 1 to 55 mm, pitch diameters up to 6300 mm and face widths up to 1250 mm.

Q: Who typically uses it?

A: Gear designers, manufacturers, inspection and metrology labs, procurement/specifiers, and standards organizations use the standard to specify and verify gear accuracy and interchangeability in engineering and production environments.

Q: Is it current or superseded?

A: The standard was published 01 July 1981 and carries at least one amendment from 1984. It is retained in national standards collections and commercial catalogues as an active reference for gear tolerances; users should verify current national adoption status and any more recent national/ISO harmonized replacements for specific regulatory or contractual requirements.

Q: Is it part of a series?

A: Yes — it is part of the family of GOST standards addressing gears and interchangeability; it references and works together with other GOST gear standards (for example GOST 13755-81) and sits in the ICS 21.200 group of gear-related standards.

Q: What are the key keywords?

A: Cylindrical gears, gear pairs, tolerances, accuracy classes, involute profile, spur/helical/herringbone gears, interchangeability, GOST 13755-81, ICS 21.200.