GOST 7798-70 PDF

Full title and description

GOST 7798-70 — Hexagon head bolts with full thread, accuracy class B. National (interstate) standard that specifies design, dimensions and technical requirements for metric hexagon bolts with full thread used in mechanical engineering and construction applications.

Abstract

This standard defines the geometry, acceptable tolerances, material/strength options and marking/identification principles for hexagon-head bolts produced to the GOST 7798-70 specification. It establishes dimensional tables and references related thread, end and tolerance standards used to ensure interchangeability and mechanical performance in bolted assemblies.

General information

• Status: Original GOST (interstate) standard from the USSR era; retained in practice with subsequent amendments noted in later editions (check national registry for current legal status in specific jurisdictions).
• Publication date: Designation year 1970 (GOST 7798-70); date of introduction listed as 01 January 1972 in later compilations/registries.
• Publisher: Gosstandart / Interstate standards bodies (GOST system).
• ICS / categories: MKS/ICS grouping for fasteners and mechanical assembly standards (listed in some references as MKS 21.060.10 / OKP 12 8200).
• Edition / version: Original 1970 edition with later amendments (amendments and changed editions noted in source texts); manufacturers commonly supply bolts to the 7798-70 dimensional series.
• Number of pages: Approx. 6–12 pages depending on the publisher’s compilation and inclusion of tables/annexes (varies by printed or PDF edition).

Scope

Applies to hexagon-head bolts of accuracy class B with metric full thread and thread diameters from M6 up to M48. The standard covers the bolt design and dimensional series (head size, shank geometry, thread run-out and ends) and references related GOST documents for thread forms, tolerances and surface condition. Typical applications include general mechanical engineering, structural assemblies and repair/maintenance works where standardized metric hex bolts are required.

Key topics and requirements

• Design and permitted dimensional series for hexagon-head bolts (head across-flats, head height, shank and threaded length) as specified by the standard.
• Thread form and parameters governed by referenced thread standard (metric thread specifications and tolerance classes such as 6g for bolts).
• Requirements for thread run-out, undercut and bolt ends referenced to complementary GOSTs (for example those covering thread run-out and bolt ends).
• Material grades and strength classes commonly supplied under the standard (steel and stainless grades; strength classes typically ranging from lower grades up to high-strength classes such as 8.8, 10.9 etc.).
• Surface treatment and coating options (electro-galvanizing, hot-dip galvanizing, passivation, cadmium, other protective coatings) and marking/identification conventions for strength class and manufacturer.

Typical use and users

Manufacturers of fasteners and metal hardware, procurement engineers, mechanical designers, maintenance and installation teams in construction and machinery manufacturing, distributors and quality control laboratories use GOST 7798-70 as the dimensional and technical reference when specifying or producing hexagon head bolts with full thread. It is commonly used where interchangeability with metric bolt series is required or where legacy equipment and documentation refer to GOST dimensions.

Related standards

Closely related documents include the companion GOST for partially threaded hex bolts (e.g., GOST 7805 series), the GOSTs that define metric thread parameters and tolerances, and national/international analogs such as DIN 933 and ISO 4017 for fully threaded hex bolts; the standard text itself references other GOSTs for threads, bolt ends and tolerances.

Keywords

GOST 7798-70, hexagon head bolt, full thread, metric bolt, accuracy class B, M6–M48, bolt dimensions, fastening standard, USSR GOST, DIN 933 analogue

FAQ

Q: What is this standard?

A: GOST 7798-70 is an interstate (GOST) standard that specifies the design and dimensions for hexagon-head bolts with full metric thread produced to accuracy class B.

Q: What does it cover?

A: It covers geometry (head and shank dimensions), dimensional series, thread/run-out/end requirements and references to other GOSTs for thread form, tolerances and surface/marking rules; it is intended to ensure interchangeability and predictable mechanical performance of bolts produced to the series.

Q: Who typically uses it?

A: Fastener manufacturers, mechanical and structural designers, procurement specialists, distributors and maintenance teams that require standardized metric hexagon bolts or must match existing equipment specified to GOST dimensions.

Q: Is it current or superseded?

A: The standard originates from 1970 (designation -70) and is listed in compilations with an introduction date of 01 January 1972; later amendments and changed editions are documented in references—practitioners should verify the current legal/regulatory status in the national standards registry applicable to their country or project.

Q: Is it part of a series?

A: Yes — it forms part of a family of GOST standards covering bolts, screws and threads (for example the related standard for partially threaded hex bolts and separate GOSTs that define thread forms, tolerances and inspection methods). Common international analogs include DIN 933 and ISO 4017 for fully threaded hex bolts.

Q: What are the key keywords?

A: Hexagon head bolt, full thread, metric bolt, GOST 7798-70, accuracy class B, M6–M48, bolt dimensions, fastening standard.