GOST 13755-81 PDF

Full title and description

GOST 13755-81 — "Basic requirements for interchangeability. Gearings — Cylindrical involute gears. Basic rack (Initial contour)". The standard defines the nominal basic rack (initial tooth contour) and related interchangeability requirements for cylindrical involute gear wheels used in general engineering and toolmaking.

Abstract

GOST 13755-81 establishes the geometry of the standard (nominal) basic rack — the reference tooth profile used to generate involute cylindrical gear teeth — and specifies basic requirements to ensure interchangeability of gears with a module of 1 mm or greater. It was issued in 1981 for use in design, production and acceptance of spur and helical gears and as a reference for associated rack-and-pinion standards.

General information

• Status: Withdrawn / Not effective — superseded (replaced by a later edition of GOST 13755 published in 2015).
• Publication date: 1981 (published 1 July 1981; approved by the USSR State Committee for Standards on 27 Feb 1981).
• Publisher: USSR State Committee for Standards (Gosstandart of the USSR).
• ICS / categories: 21.200 — Gears (Mechanical systems and components for general use).
• Edition / version: Original 1981 edition (designated by the year in the standard number: -81). Superseded by GOST 13755-2015.
• Number of pages: 8 pages (typical bibliographic record).

Scope

Applies to cylindrical involute gearings and defines the normal nominal initial contour (basic rack tooth profile) for gear wheels with a module of 1 mm and above (commonly referenced where rack-and-pinion pairs or gear cutting tools must use a standardized generating profile). It is intended for use in specification of gear cutting tools, gear design documentation and acceptance/control procedures where interchangeability is required.

Key topics and requirements

• Definition of the nominal basic rack (initial tooth contour) for involute cylindrical gears.
• Geometric parameters and construction rules for the basic rack used to generate spur and helical gear teeth.
• Scope of applicability by module (module ≥ 1 mm) and typical module limits when used with related rack standards.
• Interchangeability principles intended to ensure mating parts produced by different manufacturers will be functionally compatible when produced to the standard contour.
• Cross-references to accuracy and tolerance standards for cylindrical gears (e.g., GOST 1643-81) and related rack/pinion tolerance documents.

Typical use and users

Used by mechanical engineers, gear designers, toolmakers and manufacturers of gears and racks, quality and inspection personnel, and standards/technical documentation libraries. Typical applications include specifying the generating profile for hobs, cutters and racks, documenting gear geometry on drawings, and ensuring interchangeability in assemblies where gears from different sources must mesh correctly.

Related standards

Key related documents include: GOST 13755-2015 (replacement / updated basic rack profile standard), GOST 1643-81 (gear accuracy), GOST 10242-81 (rack-and-pinion tolerances referencing the 13755-81 contour), and international equivalents such as ISO standards on basic rack tooth profiles and cylindrical involute gears (e.g., ISO documents in the 21.200 ICS group).

Keywords

cylindrical gears; involute gears; basic rack; initial contour; interchangeability; module; gear profile; GOST 13755-81.

FAQ

Q: What is this standard?

A: GOST 13755-81 is a Soviet-era national standard that defines the nominal basic rack (initial tooth contour) and basic interchangeability requirements for cylindrical involute gears (module ≥ 1 mm).

Q: What does it cover?

A: It covers the geometry and definition of the standard generating (basic) rack tooth profile used to produce involute cylindrical gear teeth, and establishes the basis for interchangeability between mating gears and rack-and-pinion pairs; it does not by itself specify all tolerances or strength calculations (those are in related standards).

Q: Who typically uses it?

A: Gear designers, manufacturers, toolmakers (hob and cutter producers), quality/control inspectors and technical documentation authors—anyone who needs a standardized generating profile to ensure gears produced by different sources will mesh correctly.

Q: Is it current or superseded?

A: It is superseded/withdrawn. The 1981 edition is not effective today and has been replaced by an updated GOST 13755 published in 2015 (GOST 13755-2015). Users should consult the 2015 edition or current national/regional/adopted international standards for up-to-date requirements.

Q: Is it part of a series?

A: Yes — it is part of a family of GOSTs governing gears, racks and related tolerances (for example, documents on gear accuracy, rack tolerances and cutter tool specifications). It is also conceptually aligned with international gear standards in the ICS 21.200 group.

Q: What are the key keywords?

A: Cylindrical gears, involute profile, basic rack, initial contour, interchangeability, module, gear tooth profile, GOST.