GOST R 52645-2006 PDF

Full title and description

GOST R 52645-2006 — "Hexagon nuts for high-strength structural bolting with large width across flats. Specifications". The standard specifies requirements, dimensions and technical conditions for high‑strength hexagonal nuts with increased width across flats intended for use with structural high‑strength bolts in metal structures and construction.

Abstract

This national (GOST R) standard defines mechanical, dimensional and quality requirements for high‑strength hexagon nuts used in structural bolting assemblies (product grade B; typical property classes include 8 and 10). It includes permitted sizes, tolerances, basic mechanical properties and application scope for use in metal structures across standard climatic placement categories. The standard was introduced in the 2006 designation and brought into effect in practice from 2008.

General information

• Status: Withdrawn / canceled (no longer in active force; various registries indicate annulment/withdrawal).
• Publication date: Designation year 2006; introduced/implemented 01 January 2008 (commonly shown as the date of entry into force).
• Publisher: National standard of the Russian Federation — issued under the GOST R system (federal standardization authority / Rosstandart framework).
• ICS / categories: Fasteners / mechanical fastening — classification under mechanical systems and fasteners (e.g., 21.060.20 / nuts).
• Edition / version: GOST R 52645-2006 (year in designation: 2006); published/implemented edition commonly referenced from 2008.
• Number of pages: Vendors and standards repositories list ~18–20 pages depending on language/format (Russian edition often shown as 18 pages; some distributors list 20 for combined packages).

Scope

Applies to high‑strength hexagon nuts with increased width across flats used for high‑strength structural bolting in metal structures and construction. The standard covers dimensional series and tolerances for metric thread sizes commonly used in structural bolts (for example M16–M48 ranges), mechanical/property class requirements (typical classes 8 and 10), and notes use across general climatic placement categories as appropriate for construction practice. The document superseded or replaced earlier national specifications for high‑strength nuts (e.g., it was issued in place of older GOST 22354‑77 variants).

Key topics and requirements

• Dimensional specifications for hexagon nuts with increased width across flats — nominal sizes, thread pitches, widths across flats (s), chamfers and seating dimensions.
• Product grade and property classes — typical assignment to product grade B and mechanical/property classes such as 8 and 10 for high‑strength applications.
• Material and mechanical requirements — minimum mechanical characteristics, hardness or proof load requirements appropriate to the property class.
• Tolerances and fit — thread tolerances, dimensional tolerances for mating with high‑strength bolts, and permitted deviations.
• Surface treatment and coatings — typical coatings (e.g., zinc plating or other corrosion protection) and related acceptance criteria where specified.
• Testing and quality control — inspection, sampling and tests to verify mechanical and dimensional conformity for structural use.

Typical use and users

Manufacturers and suppliers of high‑strength fasteners, procurement and quality assurance teams in construction and heavy engineering, structural engineers specifying bolted connections, test laboratories performing mechanical and tolerance verification, and standards/technical libraries. Users consult the standard when specifying or producing nuts intended for structural bolting assemblies where increased wrench width is required.

Related standards

Related and analogous standards include the earlier GOST 22354‑77 (which GOST R 52645‑2006 replaced in practice), international/European equivalents such as EN 14399‑4 / DIN 6915 family for high‑strength structural connections, and other GOST/GOST‑R documents on fastener testing (for example standards covering proof‑load tests and nut/bolt property classes).

Keywords

hexagon nut, high‑strength nut, structural bolting, GOST R 52645‑2006, property class 8, property class 10, increased width across flats, product grade B, fasteners, construction nut, metric threads.

FAQ

Q: What is this standard?

A: GOST R 52645‑2006 is a Russian national (GOST R) standard that sets specifications for high‑strength hexagon nuts with increased width across flats used with structural bolting in metal constructions.

Q: What does it cover?

A: It covers dimensional series, tolerances, mechanical/property class requirements (commonly classes 8 and 10), product grade assignments, material/processing and testing/inspection requirements for nuts intended for high‑strength structural bolting.

Q: Who typically uses it?

A: Fastener manufacturers, construction and structural engineering procurement/specification teams, quality and inspection laboratories, and standards libraries consult it when producing, buying or approving nuts for high‑strength structural bolting.

Q: Is it current or superseded?

A: Sources indicate the standard was introduced in practice from 01 January 2008 but is listed in multiple registries and repositories as withdrawn/annulled (withdrawn or expired around January 2018 in some records). Always verify current legal/applicable status with the national standards body or an official standards registry before use.

Q: Is it part of a series?

A: It belongs to the family of fastener/nut standards in the GOST/GOST‑R system and is associated with related documents on nut/bolt dimensions, proof‑load testing and mechanical property classification (see earlier GOST 22354‑77 and related ISO/GOST documents for nut/bolt testing).

Q: What are the key keywords?

A: Hexagon nut, high‑strength, structural bolting, increased width across flats, property class 8, property class 10, product grade B, GOST R.