GOST 11738-84 PDF

Full title and description

GOST 11738-84 — "Hexagon socket head cap screws, accuracy class A. Construction and dimensions". The standard specifies the construction and dimensional series for cylindrical‑headed screws with an internal hexagon (socket) drive, intended for metric threads from M3 to M36 and accuracy class A.

Abstract

GOST 11738-84 defines geometric parameters, tolerances and nominal sizes for hexagon‑socket (Allen/INBUS) cylindrical‑head screws produced to accuracy class A. It was prepared to be consistent with ISO 4762:1977 and was used as the national/interstate specification for this family of fasteners in the USSR and successor states. The document covers thread diameters, head dimensions, key (socket) sizes, partial/full thread options and referenced materials and surface finishes.

General information

• Status: Withdrawn / superseded in national practice; historically adopted as an interstate (GOST) standard and later mapped to newer international/harmonized variants. Registries and distributors list the standard as withdrawn or no longer the active document.
• Publication date: Introduced 01 January 1985 (approved by decree 07 February 1984).
• Publisher: Approved and published under the USSR State Committee for Standards (Gosstandart); printed by the Standards Publishing House (Izdatel'stvo standartov).
• ICS / categories: ICS 21.060.10 (bolts, screws, studs); product group G32 (fasteners).
• Edition / version: Designation year 1984 (GOST 11738-84); introduced into force 1985; includes at least one published amendment (Amendment No.1, 1989).
• Number of pages: ~10 pages in published text (commercial distributors list a 10‑page PDF).

Scope

The standard applies to metric screws with a cylindrical head and an internal hexagonal socket (socket‑head cap screws) with nominal thread diameters from M3 up to M36. It specifies constructional drawings, dimensional tables (head diameters, head heights, socket sizes), thread run‑out/partially threaded options and tolerance fields for accuracy class A. The standard was aligned with ISO 4762:1977 (with local deviations for some socket tolerances).

Key topics and requirements

• Constructional drawings and mandatory dimensional tables for nominal diameters M3–M36, head diameters, head heights and socket (key) sizes.
• Accuracy class A tolerances for key geometric parameters (tight tolerancing for head/drive fits).
• Thread specifications (metric threads, tolerance class 6g typical) and permitted partially/fully threaded lengths.
• Materials and strength classes: permits common carbon and alloy steels and stainless steels; allows multiple strength classes (typical use includes 8.8 / 10.9 etc., with allowance in practice for lower classes where applicable).
• Surface finishes and coatings commonly referenced: uncoated, zinc (with chromate passivation), cadmium coatings and others as specified by related GOSTs.
• Normative references and equivalence: cross‑references to ISO 4762:1977 and other GOSTs governing thread tolerances and materials.

Typical use and users

Engineers, designers and drawing offices in mechanical engineering, machine‑tool manufacture, automotive and general industry use the standard for specifying socket‑head cap screws in assemblies; fastener manufacturers and distributors use it for production and procurement; maintenance and repair departments reference the standard for replacement parts and interchangeability. The standard was widely used across USSR and successor states where GOSTs remained in force.

Related standards

Directly related/analogous standards include ISO 4762:1977 (IDT), DIN 912 (commonly used European analogue), and later harmonized documents such as EN/ISO variants (for example EN ISO 4762:2016 is the modern international/harmonized specification for socket‑head cap screws). GOST 11738-84 replaced the earlier GOST 11738-72.

Keywords

GOST 11738-84; hexagon socket head cap screw; socket‑head cap screw; cylindrical head; internal hexagon; ISO 4762; DIN 912; fasteners; accuracy class A; metric screws.

FAQ

Q: What is this standard?

A: GOST 11738-84 is the Soviet/interstate specification for hexagon‑socket (Allen) cylindrical‑head screws — it defines construction and dimensions for accuracy class A socket‑head cap screws.

Q: What does it cover?

A: It covers nominal thread diameters (typically M3–M36), head and socket dimensions, tolerances for accuracy class A, allowable threaded lengths (partial or full), referenced materials and coatings, and normative links to related standards (notably ISO 4762:1977).

Q: Who typically uses it?

A: Designers, mechanical engineers, fastener manufacturers, procurement and maintenance teams that specify or supply metric socket‑head cap screws in industries using GOST documentation (historically USSR and successor states).

Q: Is it current or superseded?

A: Registries and distributors list GOST 11738-84 as withdrawn or superseded in national practice and mapped to international/harmonized standards (ISO/DIN/EN variants). Users should consult current national/regulatory catalogs (e.g., the latest GOST‑R/Rosstandart or adopted EN/ISO documents) for the active normative document in their jurisdiction.

Q: Is it part of a series?

A: It replaced an earlier edition (GOST 11738-72) and is linked by subject to other GOSTs and ISO documents governing threads, materials and coatings. It is part of the broader family of fastener standards (ICS 21.060.10).

Q: What are the key keywords?

A: Hexagon socket head cap screw; socket‑head screw; cylindrical head; internal hexagon; accuracy class A; ISO 4762; DIN 912; fasteners; metric threads.