GOST 28487-90 PDF

Full title and description

ГОСТ 28487-90 — Резьба коническая замковая для элементов бурильных колонн. Профиль. Размеры. Допуски. (English: Tool-joint tapered thread for drill string elements. Profile. Dimensions. Tolerances.)

Abstract

Standard that defines the geometry (profile), principal dimensions and permissible deviations for tool‑joint (locked/tapered) threads used on drill‑string elements (nipples and couplings). It provides designation rules for the Z‑series threads and interchangeability references with internationally used thread types.

General information

• Status: Superseded / withdrawn — replaced by GOST 28487-2018 (newer interstate standard covering thread shouldered connections with tool‑joint thread).
• Publication date: Introduced/entered into force 01 January 1993 (designation year shown as -90). Some catalogues list original edition dates and later reprints.
• Publisher: Издательство стандартов (Standards Publishing House) — original official edition and later reprints.
• ICS / categories: Screw threads / mechanical systems — commonly classified under ICS/OKS for mechanical systems and screw threads (21.040 / OKSTU 0071 in legacy records).
• Edition / version: Designation GOST 28487-90 (original standard with at least one amendment noted in archival records). Later fully superseded by GOST 28487-2018.
• Number of pages: Source listings vary (commonly shown as 8 pages in some catalogues; alternate vendor records list 11 pages). Users should consult a copy for exact pagination.

Scope

Applies to the locked (tool‑joint) tapered thread forms used on drill‑string elements (nipples and couplings). Establishes the thread profile, reference dimensions, designation rules (Z‑series), and maximum permissible deviations (tolerances) required for manufacture and interchangeability of drilling‑industry threaded connections. The standard was intended for use by producers of drill pipe and other drilling‑string components and by testing/quality laboratories.

Key topics and requirements

• Definition of the locked/tapered (tool‑joint) thread profile for both external (nipple) and internal (coupling) threads.
• Principal dimensions for Z‑series threads (designation rules such as Z‑73, Z‑86, etc.) and dimensional tables for each size.
• Permissible tolerances and limit deviations for core geometrical parameters (cone diameters, pitch, thread height, and engagement lengths).
• Designation/marking rules for right‑ and left‑hand threads and examples of conventional notation.
• Notes on interchangeability with common international/API thread types (references and conversion notes provided).
• References to amendments and handling of reissued editions (historical amendments noted in bibliographic data).

Typical use and users

Used by drill‑string component manufacturers, oil & gas drilling contractors, design and R&D departments, inspection and metrology laboratories, and technical procurement teams specifying threaded connections for downhole equipment. The standard was primarily aimed at the petroleum and gas drilling industry.

Related standards

Directly superseded by GOST 28487-2018 (which provides updated, harmonized technical requirements). Related international and national documents include ISO 10424-2 (and its national adoptions), GOST R 56349‑2015 (adoption of ISO 10424-2 principles for drill‑pipe threads), and various API thread standards used for mapping/interchangeability.

Keywords

tool‑joint, locked thread, tapered thread, drill string, Z‑series threads, nipple, coupling, thread profile, dimensions, tolerances, drill pipe, oil & gas drilling.

FAQ

Q: What is this standard?

A: A Soviet/Russian GOST that specified the locked (tool‑joint) tapered thread profile, dimensional system and tolerances used for drill‑string elements (nipples and couplings).

Q: What does it cover?

A: The thread form (profile), dimensional tables for the Z‑series (Z‑65, Z‑73, Z‑86, etc.), permitted deviations, designation rules, and related manufacturing/acceptance notes for drill‑string threaded connections.

Q: Who typically uses it?

A: Manufacturers of drill pipe and couplings, drilling equipment vendors, drilling contractors, design engineers and quality/inspection laboratories in the petroleum and gas industry.

Q: Is it current or superseded?

A: Superseded — GOST 28487-90 has been replaced by GOST 28487-2018 (the 2018 interstate standard contains updated and harmonized technical requirements and is the active document to cite for current work).

Q: Is it part of a series?

A: It belongs to the family of standards covering drill‑string connections and screw threads; later editions and related documents (including GOST R and ISO/API references) provide complementary requirements for drill pipes and thread control methods.

Q: What are the key keywords?

A: Tool‑joint, locked/tapered thread, drill‑string, nipple, coupling, Z‑series, profile, dimensions, tolerances.