GOST 25229-82 PDF

Full title and description

GOST 25229-82 — Basic norms of interchangeability. Metric taper (conical) screw thread. The standard establishes the nominal profile, cone angle/conicity, diameters, pitches, principal dimensions and tolerances for metric conical (taper) threads used in conical threaded joints and in joints of external conical threads with internal cylindrical threads.

Abstract

GOST 25229-82 specifies the geometry and interchangeability requirements for metric taper (MK) threads with conicity 1:16 (used to ensure sealing and locking without additional means), including designation rules, size series (nominal diameters and pitches), basic limits/tolerances and recommendations for mating an external conical thread with an internal cylindrical thread. The standard cross-references the nominal profile given by GOST 9150-81 and reproduces size tables for diameters from small to medium ranges.

General information

• Status: Active (in force / действует).
• Publication date: Approved 27 April 1982; came into effect 1 January 1983 (original Soviet standard).
• Publisher: State Committee for Standards of the USSR (Gosstandart) / Interstate standardization bodies (as published under USSR state standard headings).
• ICS / categories: OKS / classification shown in bibliographic records as 21.040.10 (fasteners / screw threads); KGS code G13 in some catalogs.
• Edition / version: Original 1982 standard (effective 1983); reprinted/republished in later compilations (noted reissue in 2002 collections of metric threads).
• Number of pages: Bibliographic listings show 4 pages (some commercial reproductions list 4–5 pages depending on format).

Scope

The standard applies to metric taper (MK) threads with a conicity of 1:16 and a 60° thread profile for use in conical threaded connections and in joints where an external conical thread is assembled with an internal cylindrical thread. It defines profile form, nominal diameters, standard pitches, basic dimensions and tolerance fields needed to ensure interchangeability and sealing performance in mechanical and hydraulic assemblies.

Key topics and requirements

• Conicity: 1:16 (taper specified to ensure sealing properties of conical threaded joints).
• Thread profile: 60° triangular metric profile; nominal profile referenced to GOST 9150-81.
• Designation: MK (metric taper) notation — e.g., MK 20×1.5; internal cylindrical threads mated to external conical are marked M/МК 20×1.5 (per examples in the standard).
• Dimensional range and pitches: tables cover nominal diameters (commonly in the range ~6–60 mm) and standard pitches (examples include 1; 1.5; 2 mm depending on diameter).
• Tolerances and limits: the standard establishes basic limits for external and internal diameters, average-diameter differences over specified lengths, and thread engagement depth requirements (e.g., minimum engagement recommendations for mating threads).
• Interchangeability notes: where sealing is not critical or sealants are used, some groove/clearing forms of roots/crests are not strictly regulated; references to related tolerance standards (e.g., GOST 16093-81) are included.

Typical use and users

Typical users are mechanical and design engineers, machinists, fastener and hydraulic fitting manufacturers, maintenance and repair workshops, and standards libraries. Common applications include pressure piping and hydraulic connections, machine-tool components, and any assemblies requiring a conical metric thread for sealing or locking without additional sealing elements.

Related standards

GOST 9150-81 (nominal metric thread profile referenced by GOST 25229-82); GOST 16093-81 (tolerance fields and fits referenced in thread tolerance notes); ST СЭВ 304-76 (CMEA / SEV related designation shown in the standard header); GOST 6211-81 and other GOSTs for pipe and thread types used in mating assemblies. These are cited or cross-referenced within bibliographic descriptions and the standard text.

Keywords

GOST 25229-82; metric taper thread; MK thread; conical thread; conicity 1:16; 60° profile; thread pitches; interchangeability; metric conical thread; nominal diameters; MK designation.

FAQ

Q: What is this standard?

A: GOST 25229-82 is a Soviet / interstate standard that defines the basic norms of interchangeability for metric taper (conical) screw threads (designation MK), specifying profile, conicity, sizes, pitches and tolerances.

Q: What does it cover?

A: It covers the geometry (60° profile), cone ratio (1:16), nominal diameters and standard pitches for metric taper threads, plus dimensional tables, tolerance limits and rules for designation and mating with internal cylindrical threads.

Q: Who typically uses it?

A: Mechanical designers, manufacturing engineers, fastener and hydraulic fitting producers, maintenance technicians and standards document users who need consistent dimensions and interchangeability for conical metric threaded connections.

Q: Is it current or superseded?

A: Bibliographic records list GOST 25229-82 as currently in force (действует). It was approved in 1982 and became effective from 1 January 1983; it has been reprinted in later compilations of metric thread standards. Users should check national/institutional catalogs for the latest consolidated editions or amendments before design work.

Q: Is it part of a series?

A: Yes — it is part of a family of GOST standards on metric threads and interchangeability (cross-referenced with GOST 9150-81 for profile, and with other GOSTs covering tolerances, pipe threads and related fastener standards).

Q: What are the key keywords?

A: MK, metric taper thread, conicity 1:16, 60° profile, interchangeability, nominal diameters (6–60 mm range in tables), pitches 1 / 1.5 / 2 mm (by diameter), GOST 9150-81.