GOST 8773-73 PDF

Full title and description

GOST 8773-73 — Standard specifying dimensions, tolerances and technical requirements for ground and polished bars (cylindrical steel bars) used in precision engineering and tooling. The standard establishes nominal sizes, permissible deviations, surface finish and inspection requirements for ground and polished round bars intended for machining and assembly applications.

Abstract

This Soviet-era standard (GOST 8773-73) defines the basic assortment, dimensional series, tolerances, surface quality and acceptance rules for ground and polished cylindrical steel bars. It provides requirements to ensure interchangeability and suitability of these bars for precision components, press-fit assemblies, shafts and tooling elements where tight dimensional and surface control are required.

General information

• Status: Historically active standard from the USSR period; in many contexts treated as superseded or of historical/industry-reference value—check national/regional adoption for current applicability.
• Publication date: 1973
• Publisher: USSR National Standards Body (Gosstandart / GOST)
• ICS / categories: 25.040 (Metallurgical products) and 21.060 (Machine parts and components); product standard for steel bars
• Edition / version: Original issue: 1973 (designation GOST 8773-73)
• Number of pages: Typically a short product standard — commonly in the range of 6–16 pages depending on the issued compilation; the exact page count varies by publication print.

Scope

GOST 8773-73 covers ground and polished cylindrical steel bars (round bars) of specified nominal diameters and length ranges intended for use where improved dimensional accuracy and surface finish are required compared with hot-rolled or turned bars. The standard sets out dimensional series, tolerance classes, allowable deviations, surface finish requirements, and inspection/acceptance rules. It applies to carbon and alloy steel grades that are subsequently processed to meet the listed geometric and surface criteria, unless otherwise specified in related material standards.

Key topics and requirements

• Designation and nominal size series for ground and polished round bars (standard diameters and length ranges).
• Tolerance classes for diameter and straightness limits appropriate for precision bars.
• Surface finish and defect limits after grinding/polishing (surface quality, allowable scratches or laps).
• Permissible deviations in roundness, cylindricity and end-face squareness.
• Marking, packing and delivery conditions to preserve surface quality during storage and transport.
• Inspection and acceptance rules: sampling, measurement methods and criteria for conformity.
• Notes regarding heat treatment or material properties are referenced to material-specific GOSTs rather than specified in detail within this document.

Typical use and users

Used by steel product manufacturers, precision bar mills, toolmakers, mechanical engineering firms, and procurement/specification engineers requiring ground and polished bars for shafts, dowel pins, press-fit components, bearings interfaces, precision tooling and jigs. Also referenced by quality control and inspection departments when verifying dimensional and surface requirements of supplied bars.

Related standards

Related GOSTs and standards typically referenced include material-specific standards for steel grades and heat treatment, general tolerances and geometric tolerances standards, and standards covering turned, cold-drawn or ground bars. In modern contexts, equivalent or successor national/regional standards for ground/polished bars or ISO standards on tolerances and surface finish may be consulted for current practice.

Keywords

GOST 8773-73; ground bars; polished bars; round bars; cylindrical bars; dimensional tolerances; surface finish; precision bars; USSR standard; steel bars; tolerances; acceptance rules.

FAQ

Q: What is this standard?

A: GOST 8773-73 is a Soviet-era product standard that specifies dimensions, tolerances, surface quality and acceptance rules for ground and polished round steel bars.

Q: What does it cover?

A: It covers nominal diameters and length ranges, tolerance classes for diameter and straightness, surface finish requirements after grinding/polishing, allowable geometric deviations, marking, packing and inspection/acceptance procedures for precision cylindrical bars.

Q: Who typically uses it?

A: Steel manufacturers, precision bar producers, mechanical and tool engineers, quality control inspectors and procurement specialists who need ground and polished bars for precision mechanical components.

Q: Is it current or superseded?

A: Issued in 1973, the standard is from the USSR period and in many applications is considered superseded or of historical reference. Users should verify whether a national successor, a modern GOST revision, or an equivalent international/regional standard applies in their jurisdiction.

Q: Is it part of a series?

A: It is part of the family of GOST product standards covering steel bars and metal products; material properties and heat-treatment requirements are typically governed by related GOSTs specific to steel grades.

Q: What are the key keywords?

A: Ground bars, polished bars, round bars, tolerances, surface finish, precision bars, GOST 8773-73, cylindrical bars.