GOST 6111-52 PDF

Full title and description

GOST 6111-52 — "Taper inch thread with profile angle 60°" (Russian: «Резьба коническая дюймовая с углом профиля 60°»). The standard specifies the profile, basic dimensions and tolerances for conical (tapered) inch pipe threads with a 60° thread profile used in piping and machine connections.

Abstract

Defines geometric profile, nominal sizes, pitch, working and reference diameters, thread lengths and permissible deviations for tapered inch threads intended for fuel, oil, water and air pipelines of machines and machine tools. Includes tables of sizes (K-designations), tolerances for profile angle and pitch, and basic application notes for pipe connections.

General information

• Status: Active / in force.
• Publication date: Approved 10 January 1952; in force from 1 October 1952.
• Publisher: Approved by the standards authority of the USSR (Gosstandart) — historically published as a state standard; text maintained in modern Russian standards collections.
• ICS / categories: 21.040.20 (Screw threads — Inch threads / Mechanical systems and devices).
• Edition / version: Original 1952 edition with later editorial changes and amendments recorded (noted editorial updates in 1970s–1980s in consolidated collections).
• Number of pages: 4 pages (concise technical standard with tables and drawings).

Key bibliographic/factual details above compiled from recognized standards registries and document repositories.

Scope

The standard applies to conical (tapered) inch threads with a 60° profile used for threaded connections in fuel, oil, water and air piping on machines and machine tools. It establishes dimensions and tolerances for commonly used K-designated sizes (for example K 1/8", K 1/4", K 3/8", K 1/2", K 3/4", K 1", etc.) and includes provisions and notes on compatibility with other pipe-connection standards used in particular piping systems.

Key topics and requirements

• Thread profile: 60° included angle (triangular thread form).
• Taper geometry and designation: conical (tapered) inch thread sizes recorded with "K" designation (example: K 3/4" GOST 6111-52).
• Basic dimensions: external and internal diameters in the reference plane, thread length (working and from pipe end to reference plane), and pitch (threads per inch converted to metric pitch values in tables).
• Tolerances: permissible deviations for profile half-angle, taper angle, and pitch over defined gauge lengths; separate limits for external and internal threads.
• Application notes: intended for pipeline connections on machines and machine tools; references to related GOSTs for particular pipeline systems (see Related standards).

Typical use and users

Used by mechanical designers, toolmakers, pipefitters, manufacturers of hydraulic and pneumatic equipment, maintenance engineers and standards librarians working with machine-tool piping, oil and fuel systems, and other mechanical systems that employ inch tapered pipe threads. Typical tasks: specifying mating threaded fittings, producing / inspecting threaded components, selecting gauges and tools for acceptance/control.

Related standards

Commonly referenced or complementary documents include other GOSTs covering pipe thread systems and mating connections (for example standards governing pipe thread connections in water-gas pipelines and other industrial thread types). In practice designers also check compatibility with national and international tapered-pipe-thread specifications when interfacing with non-GOST components. Specific GOST cross-references are noted in the standard text (see notes regarding GOST 6211-81 and others in national collections).

Keywords

GOST 6111-52; tapered inch thread; conical thread; 60° profile; K-designation; pipe thread; thread tolerances; pipe fittings; machine piping.

FAQ

Q: What is this standard?

A: GOST 6111-52 is a Soviet / Russian state standard that defines conical (tapered) inch threads with a 60° profile — dimensions, pitch, thread lengths and permissible deviations for use in piping on machines and machine tools.

Q: What does it cover?

A: It covers the geometric profile, nominal sizes (K-designations), conversion to metric values, working/reference diameters, length parameters and tolerances (profile angle, taper, pitch deviations) for tapered inch pipe threads. Tables and drawings give the exact numerical data for commonly used sizes.

Q: Who typically uses it?

A: Mechanical designers, production engineers, inspection and quality personnel, toolmakers, pipefitters and maintenance staff involved with threaded pipe connections in machinery, hydraulic/pneumatic systems and related equipment.

Q: Is it current or superseded?

A: The document is published as GOST 6111-52 and is listed in contemporary standards collections as active (historical adoption 1952 with later editorial updates/amendments noted in catalogues). Users should consult the latest consolidated national standards database or official standards provider for the current editorial status or any national replacements.

Q: Is it part of a series?

A: It belongs to the family of screw-thread standards (ICS category 21.040 — screw threads). It is one of the GOST documents that together govern pipe and screw thread forms used in Russian and former-Soviet engineering practice; related GOSTs address metric conical threads, cylindrical threads and application-specific thread systems.

Q: What are the key keywords?

A: Conical inch thread; tapered thread; 60° profile; K-designation; pipe thread; GOST 6111-52; pipe fittings; thread tolerances; machine piping.