GOST 1759.4-87 PDF

Full title and description

GOST 1759.4-87 — "Bolts, screws and studs. Mechanical properties and test methods". National/regional GOST standard that establishes mechanical-property criteria, minimum breaking and proof loads, hardness limits and standardised test methods for bolts, screws and studs made of carbon and alloy steels with metric threads.

Abstract

This standard specifies required mechanical properties (tensile strength, yield/proof behaviour, minimum breaking loads, hardness criteria, and impact/ductility checks where applicable) and detailed methods of test (tensile tests, proof-load tests, oblique-washer tearing tests, hardness measurements and sample preparation) for bolts, screws and studs with metric threads. It is aligned with ISO 898-1:1978 in scope and content.

General information

• Status: Listed in commercial catalogues both as an implemented GOST (catalog entries) and in some repositories as withdrawn/obsolete; national registries and distributors may show differing statuses — consult the applicable national standards body before use.
• Publication date: Original designation year 1987 (hence the "-87" suffix); entry/availability in many catalogs shows 1 January 1989 as the published/notification date.
• Publisher: Issued under the GOST system (State standard system originally administered by Gosstandart of the USSR; GOST documents are now maintained/registered via Rosstandart / EASC repositories for regional GOSTs).
• ICS / categories: Mechanical systems and components for general use — screw threads / fasteners; commonly classified under ICS 21.040.10 (screw threads, threaded fasteners).
• Edition / version: Designation GOST 1759.4-87 (1987 edition); catalogues note amendments implemented (amendment references such as Amd. 1/1989 and Amd. 2/1990 appear in vendor/registry notes).
• Number of pages: Commercial copies and catalogues list the standard as 16–17 pages (catalog entries vary by distributor).

Scope

Applies to bolts, screws and studs made of carbon, unalloyed and alloy steels with metric threads (thread diameters typically covered from 1 mm up to 48 mm) produced to common GOST thread practice; excludes set screws and fasteners with special requirements (e.g., weldability, corrosion resistance, or service temperatures outside specified ranges). The standard sets classes of strength and prescribes required tests to verify mechanical behaviour.

Key topics and requirements

• Definitions of strength classes for bolts, screws and studs (e.g., classes such as 3.6, 4.6, 5.6 … up to 12.9) and their interpretation (nominal tensile strength and ratio of yield to tensile).
• Minimum breaking (ultimate tensile) loads and proof/test loads for coarse and fine threads by nominal diameter and strength class.
• Detailed tensile-test procedures for whole fasteners or machined specimens, including clamping, loading rates, and measurement of elongation and residual elongation.
• Oblique-washer (eccentric-washer) tear test under the head for short threaded parts and provisions for when full-length tensile tests are impractical.
• Hardness measurement rules (locations, allowable differences between core and surface hardness to detect case hardening or surface carburisation) and maximum permitted surface hardness per class.
• Sampling and two test programs (A and B) for routine and more stringent control; required test program B for items below specified breaking-load thresholds.

Typical use and users

Used by manufacturers of threaded fasteners, quality/control laboratories, procurement/specification engineers, and testing houses that verify mechanical properties of bolts, screws and studs for industrial and construction applications. Also referenced by designers and technical standards authors when specifying mechanical property requirements for fasteners in assemblies.

Related standards

Part of the GOST 1759 series and commonly cited alongside: GOST 1759.0-87 (general technical conditions for bolts, screws, studs and nuts), GOST 1759.5-87 (mechanical properties and test methods for nuts), GOST 24705 (metric thread basic standard) and international counterpart ISO 898-1 (mechanical properties of fasteners). References and cross-references appear in national catalogs and related GOST pages.

Keywords

bolts, screws, studs, fasteners, mechanical properties, tensile test, proof load, oblique-washer test, hardness, strength classes, GOST, ISO 898-1.

FAQ

Q: What is this standard?

A: GOST 1759.4-87 is a GOST standard that defines mechanical-property requirements and standard test methods for bolts, screws and studs made of carbon and alloy steels with metric threads. It aligns with the content of ISO 898-1 (1978) for threaded fasteners.

Q: What does it cover?

A: It covers strength classes and their interpretation, minimum breaking and proof loads by diameter and class, tensile and proof-load test procedures, oblique-washer tear testing for short-threaded parts, hardness measurement rules and sampling/test-program requirements for inspection.

Q: Who typically uses it?

A: Fastener manufacturers, testing laboratories, quality/inspection teams, procurement and design engineers specifying fastener mechanical requirements, and standards bodies referencing established mechanical-test methods.

Q: Is it current or superseded?

A: Public catalogues and vendors list GOST 1759.4-87 and associated amendments (late-1980s amendments) while some repositories mark it as withdrawn — status can vary by national registry and distributor. For definitive legal/mandatory status check the national standards body or the current EASC/Rosstandart register before using it for regulatory compliance.

Q: Is it part of a series?

A: Yes — it is one part of the GOST 1759 family of documents that together cover technical conditions and mechanical property/testing requirements for bolts, screws, studs and nuts (see GOST 1759.0-87, 1759.5-87, etc.).

Q: What are the key keywords?

A: Strength classes (e.g., 4.8, 8.8, 10.9), tensile strength, proof load, oblique-washer (eccentric washer) test, hardness, sampling programs, bolts, screws, studs, GOST, ISO 898-1.