GOST 9064-75 PDF

Full title and description

GOST 9064-75 — "Nuts for flanged connections with medium temperature from 0 to 650 °C. Types and main (general) sizes." The standard specifies types (hexagon and cap nuts) and the principal dimensional series for nuts used in high‑temperature flanged joints.

Abstract

GOST 9064-75 establishes dimensional, type and application requirements for hexagonal and cap (closed-end) nuts intended for flanged connections on steam and gas turbines, steam boilers, pipelines, fittings, instruments, apparatus and reservoirs operating in media with temperatures from 0 °C up to 650 °C. The standard includes size tables, key dimensions, typical mass values and notes on limits of application (for example an exclusion for certain low‑pressure assemblies).

General information

• Status: National (GOST) / interstate standard — adopted by the USSR Gosstandart and retained in reference libraries; has published amendments and remains used by manufacturers and suppliers.
• Publication date: Approved 28 March 1975; date of introduction (effective) 1 January 1976.
• Publisher: Gosstandart (USSR) / Issued by the standards publisher (Izdatel'stvo standartov) in official collections.
• ICS / categories: ICS 23.040.60 (flanges, couplings and pipe fittings; related fasteners).
• Edition / version: Original designation GOST 9064-75 (replacing GOST 9064-69); amendments published (noted amendments in 1980 and mid‑1980s in official records).
• Number of pages: Typical published text listed as 7–8 pages depending on publisher/print edition (commercial listings and standards repositories commonly show 8 pages).

Scope

The standard applies to hexagon and cap nuts for flanged connections used on steam and gas turbines, steam boilers, pipelines, connecting parts, valves, instruments, apparatus and reservoirs where the medium temperature is from 0 °C up to 650 °C. It does not apply to flanged joints of objects under the jurisdiction of Gosgortekhnadzor with a nominal pressure lower than 4 MPa (40 kgf/cm²). The standard defines types, principal dimensions and size tables for nominal thread diameters (covering a wide range from about M10 up to M160 in the dimensional tables).

Key topics and requirements

• Temperature range of applicability: 0 °C to 650 °C (design/use temperature boundary for specified nut types).
• Defined nut types: Type A — hexagonal nut (through thread); Type B — cap (closed-end) nut.
• Dimensional series and tables: nominal thread diameters (M10…M160) with specified across‑flats, heights and other characteristic dimensions for each type and size.
• Thread tolerance and fit: typical field of tolerance indicated as 6H (metric thread tolerance class commonly referenced for these nuts in commercial and technical listings).
• Materials and strength classes: typical steel grades and strength classes are shown in application notes and manufacturer specs (common steels include carbon and alloy steels and various stainless grades; strength classes and surface treatments are applied per application requirements).
• Exclusions and safety notes: not intended for certain low‑pressure assemblies under specific supervisory jurisdictions (pressure < 4 MPa) and other listed exceptions.

Typical use and users

Primary users are engineers and designers in power generation (steam and gas turbines, boilers), pipeline and process industries (oil & gas, petrochemical, chemical), manufacturers of pipeline fittings and fasteners, maintenance and overhaul organizations, and procurement specialists sourcing flange fasteners for high‑temperature service. Manufacturers and suppliers of nuts and studs commonly produce parts to GOST 9064-75 dimensions.

Related standards

Related or commonly paired standards include GOST 9065-75 (washers for flanged connections), GOST 9066-75 (studs or bolts for flanged connections in the same temperature class), GOST 5915-70 (hexagon nuts general series), and various industry OST/СТП documents and later technical specifications that address cold/low‑temperature or alternate material requirements. Commercial suppliers also reference OST and STP documents used in specific industries.

Keywords

GOST 9064-75; nuts; flanged connections; hexagon nut; cap nut; high‑temperature fasteners; 0–650 °C; flange fastener dimensions; turbine fasteners; boiler fittings.

FAQ

Q: What is this standard?

A: GOST 9064-75 is a national/interstate standard that specifies types and principal dimensions for hexagon and cap nuts used in flanged connections operating at media temperatures from 0 to 650 °C.

Q: What does it cover?

A: It covers the dimensional series, main sizes, nominal thread diameters, typical across‑flat and height dimensions for Type A (hexagon) and Type B (cap) nuts, example mass values and application limits (including the stated temperature range and stated exclusions for certain low‑pressure assemblies).

Q: Who typically uses it?

A: Designers and engineers in thermal power, turbine and boiler manufacturing, pipeline and process industries, fastener manufacturers, and maintenance/procurement teams specifying flange fasteners for high‑temperature service.

Q: Is it current or superseded?

A: The standard was approved 28 March 1975 and introduced 1 January 1976; official records show published amendments and that the document remains in standards libraries and commercial use references. Some industry sectors may use updated OST/СТП documents or technical specifications for specialized conditions, but GOST 9064-75 continues to be the dimensional reference for many suppliers. Users should verify current mandatory/regulatory requirements in their jurisdiction before reliance.

Q: Is it part of a series?

A: Yes — GOST 9064-75 is part of a family of flange‑fastener standards (for example companion standards for washers and studs in the same temperature class: GOST 9065-75 and GOST 9066-75) and is commonly used alongside related GOST and OST documents for flange assemblies.

Q: What are the key keywords?

A: Nuts for flanged connections, hexagon nut, cap nut, high‑temperature fasteners, flange dimensions, GOST 9064-75, turbine/boiler flange fasteners.