GOST 9066-75 PDF

Full title and description

GOST 9066-75 — "Шпильки для фланцевых соединений с температурой среды от 0 до 650 град. C. Типы и основные размеры" (Studs for flange joints with media temperature from 0 to 650 °C — types and principal dimensions). The standard specifies types, principal dimensions and general application limits for one- and two-ended studs used in flanged connections of turbines, boilers, pipelines, valves, instruments, vessels and other equipment operating with metal temperatures in the range 0…650 °C.

Abstract

This interstate standard defines dimensional series, types (solid, through-bored, with hex/cylindrical ends, etc.), nominal thread and shank diameters, recommended materials and common strength classes for studs used in high- and medium-temperature flange connections. It excludes certain low-pressure items under the jurisdiction of specialised safety authorities. The document is intended to ensure interchangeability and safe bolting practice for flange assemblies up to the stated temperature limit.

General information

• Status: Active / in force.
• Publication date: Approved 28 March 1975; introduced 1 January 1976.
• Publisher: Interstate (Gosstandart) standard; published by the standards publisher (Издательство стандартов).
• ICS / categories: OKS / ICS: pipeline and flange fasteners — 23.040.60 (hydraulic/pneumatic systems and components of general purpose).
• Edition / version: Original 1975 edition (GOST 9066-75), replaces GOST 9066-69; has recorded amendments in 1980 and 1985 and a protocol removing a time limit in 1994.
• Number of pages: 29 pages (typical bibliographic record).

Scope

The standard applies to one- and two-ended studs for flange joints used in steam and gas turbines, steam boilers, pipelines and related connecting parts, valves, instruments, apparatus and reservoirs where metal temperatures are between 0 °C and 650 °C. It does not apply to flange joints of facilities under the jurisdiction of industrial safety supervision (Gosgortechnadzor) when nominal pressure is less than 4 MPa (40 kgf/cm²). The standard covers nominal thread and shank diameters from M10 up to M160 (as applicable) and gives recommended size series for typical flange DN/PN combinations.

Key topics and requirements

• Definition of stud types (solid studs, through-bored studs with axial holes, studs with hex or cylindrical projecting ends for heating or keying) and their intended application ranges.
• Principal dimensional series linking flange DN/PN to recommended stud diameter and length (tables of D × L combinations for common DN/PN values).
• Temperature rating: intended for metal temperatures from 0 °C up to 650 °C; selection of materials and heat-resistant grades for higher temperatures.
• Allowed materials and strength classes: ranges of carbon, alloy and stainless steels and common strength classes (e.g., 6.8, 8.8, 10.9, etc.) used for studs in pressure and temperature service.
• Threading and manufacturing notes: thread standards and methods (cutting or rolling) referenced by the standard (threading per the applicable thread standard).

Typical use and users

Manufacturers of studs and fasteners, flange and pipeline fabricators, boiler and turbine builders, maintenance and repair workshops, piping and mechanical engineers, and procurement specialists for power plants and process industries use this standard to select correct stud types, dimensions and materials for flange bolting exposed to elevated temperatures up to 650 °C. Suppliers and fabricators also use the standard to ensure interchangeability with flanges and assemblies designed to associated flange standards.

Related standards

Referenced or related standards include earlier GOST 9066-69 (replaced), flange standards used to match stud sizes (for example GOST standards for flanges and flange connections), and the thread standards used for studs (threads per the applicable GOST thread standards). Industry suppliers often coordinate GOST 9066-75 dimensions with flange standards for DN/PN selection and with strength-class and material standards for bolting.

Keywords

GOST 9066-75; studs; studs for flange connections; flange bolts; M‑thread studs; high-temperature studs; pipeline fasteners; turbine studs; boiler studs; flange hardware; dimensions; types and sizes.

FAQ

Q: What is this standard?

A: GOST 9066-75 is an interstate (former USSR) standard that defines types and principal dimensions of studs used in flange joints where metal temperature is between 0 and 650 °C.

Q: What does it cover?

A: It covers one- and two-ended studs for flange joints, specifying types, size series (nominal thread and shank diameters and lengths), intended application areas (turbines, boilers, pipelines, valves, vessels), temperature range up to 650 °C and related dimensional tables and manufacturing notes. It excludes certain low-pressure flange assemblies under specific regulatory jurisdiction.

Q: Who typically uses it?

A: Fastener manufacturers, flange and pipeline fabricators, equipment OEMs (turbine/boiler builders), maintenance and inspection teams in power generation and process industries, and procurement/engineering departments specifying bolting for elevated-temperature flange connections.

Q: Is it current or superseded?

A: As recorded in bibliographic sources, GOST 9066-75 is listed as active (in force). It replaced GOST 9066-69 and has recorded amendments; a protocol of 1994 removed a time limitation on its validity. Users should verify current national or interstate status if required for regulatory compliance.

Q: Is it part of a series?

A: The standard is part of the family of fastening and flange-related GOSTs and references other normative documents for threads, flange dimensions and material/strength classes. It is the designated GOST for studs intended for flange joints in the stated temperature range and fits into the broader pipeline and pressure-equipment normative system.

Q: What are the key keywords?

A: Studs, flange studs, bolting, high-temperature fasteners, M‑thread studs, flange connections, GOST 9066-75, studs for turbines/boilers/pipelines.