ISO 251-1987 rus PDF

Full title and description

St ISO 251-1987 (Russian language edition/adoption) — Conveyor belts — Widths and lengths. This document is the Russian rendition/identification of ISO 251:1987, which specifies nominal widths and the corresponding tolerances for conveyor belts with a textile carcass (lengths are not standardized).

Abstract

ISO 251:1987 defines standardized nominal widths (tabulated) and tolerances for conveyor belts with textile carcasses. The second edition (1987) replaced the 1976 edition and was later withdrawn and superseded by subsequent ISO revisions (2003, 2012 and most recently 2024). The Russian designation "St ISO 251-1987 rus" indicates the standard as published/adopted in 1987 in the ISO series and identified in Russian-language records.

General information

• Status: Withdrawn (second edition published 1987; later revised and replaced by newer editions).
• Publication date: July 1987 (Edition 2).
• Publisher: International Organization for Standardization (ISO); Russian-language/adopted edition indicated by the "St" / "rus" labeling.
• ICS / categories: 53.040.20 (Components for conveyors / conveyor belts).
• Edition / version: Edition 2 (1987).
• Number of pages: 1 (concise tabulation document).

Scope

This standard specifies the nominal widths and the permissible tolerances for conveyor belts with a textile carcass; it tabulates nominal widths from 300 mm up to and including 3 200 mm and states that the lengths of conveyor belts are not standardized. The standard applies to the dimensional specification of belt widths and is intended for use where consistent belt widths and tolerance limits are required for manufacturing, procurement and interchangeability.

Key topics and requirements

• Tabulation of nominal belt widths (typical range: 300 mm to 3 200 mm) and associated width tolerances.
• Statement that belt lengths are not standardized (lengths typically specified by purchaser/producer).
• Applicability to conveyor belts with textile carcass construction (dimensional guidance, not performance characteristics).
• Provision of manufacturing/ordering dimensional tolerances to support interchangeability and procurement specifications.
• Lifecycle note — this edition was later withdrawn and superseded by ISO 251 editions published in 2003, 2012 and ultimately 2024; consult the latest edition for current tolerated dimensions and any expanded scope or notes.

Typical use and users

Primary users include conveyor-belt manufacturers, materials-handling equipment designers, procurement/specification engineers, quality-control and inspection personnel, and standards libraries or translators producing national/adopted-language versions. The standard is used when defining ordered belt widths, preparing technical datasheets, or ensuring compatibility between belt suppliers and conveyor-system manufacturers.

Related standards

Related and successive documents include the original ISO 251:1976 (first edition), ISO 251:2003 and ISO 251:2012 (subsequent revisions), and the most recent revision ISO 251:2024. Other related ISO references cited in later editions concern light conveyor belts and tolerancing for cut light belts (for example, references to ISO 15147 and ISO 21183 series appear in later product-family notes); users should consult the latest ISO 251 edition and those referenced standards for current cross-references.

Keywords

conveyor belt; textile carcass; widths; lengths; dimensional tolerances; ISO 251; St ISO 251-1987; withdrawn; conveyor components.

FAQ

Q: What is this standard?

A: St ISO 251-1987 is the Russian-designated identification of ISO 251:1987 — an ISO International Standard that specifies nominal widths and tolerances for conveyor belts with textile carcasses.

Q: What does it cover?

A: It tabulates nominal belt widths (from 300 mm up to 3 200 mm in the 1987 edition) and gives corresponding tolerances; it explicitly notes that belt lengths are not standardized and should be specified separately.

Q: Who typically uses it?

A: Conveyor-belt manufacturers, system designers, procurement/specification engineers, inspection and quality personnel, and standards bodies or translators preparing national adoptions.

Q: Is it current or superseded?

A: The 1987 (second) edition is withdrawn and has been superseded by later editions (ISO 251:2003, ISO 251:2012 and the current ISO 251:2024). For current requirements and any revisions to nominal widths/tolerances or scope, consult the latest edition (ISO 251:2024).

Q: Is it part of a series?

A: ISO 251 has multiple editions (1976, 1987, 2003, 2012, 2024). Later editions remain within the same subject area (conveyor-belt dimensions) and may reference other ISO standards applicable to specific belt types (for example, light conveyor belts and related tolerancing documents).

Q: What are the key keywords?

A: Conveyor belts; widths; lengths; tolerances; textile carcass; dimensional standard; ISO 251; withdrawn edition (1987).