GOST R 41.55-2005 PDF

Full title and description

GOST R 41.55-2005 — "Uniform provisions concerning mechanical coupling components of combinations of vehicles" (ГОСТ Р 41.55-2005). The document contains technical and approval requirements for mechanical coupling devices and components used on towing combinations (drawbars, coupling heads, towing eyes, fifth wheels and related parts).

Abstract

This standard reproduces uniform technical provisions for the approval, testing, marking and installation of mechanical coupling components for combinations of vehicles and is aligned with the UN/ECE Regulation No. 55 (mechanical coupling components). It specifies dimensional and strength criteria, performance tests, marking and conformity of production requirements for coupling devices and components.

General information

• Status: Catalog listings are inconsistent: commercial standards databases list the document both as active and—on other vendor/catalog entries—as withdrawn or superseded; users should verify current legal status with Rosstandart (national authority).
• Publication date: Designation year 2005 (published/registered in catalogs with an issue/publication entry dated mid‑2006 in some sources).
• Publisher: Issued as a GOST R (Russian national/interstate) vehicle regulation document under the national system of standards (published through the Russian standards infrastructure / Rosstandart distribution channels and commercial standards houses).
• ICS / categories: 43.040.70 (Couplings); related classification may include 43.040.60 (Bodies and body components).
• Edition / version: GOST R 41.55-2005 (original designation/year: 2005).
• Number of pages: Typically shown as 55 pages in commercial catalog entries.

Scope

Applies to mechanical coupling components of combinations of vehicles (including towing couplings, drawbar eyes, fifth‑wheel assemblies and associated parts) used on road vehicles and trailers. The standard sets out approval procedures for both components and vehicles fitted with those components, dimensional and strength requirements, test methods and marking/identification requirements; it implements the technical content and many test/marking rules corresponding to UN/ECE Regulation No.55.

Key topics and requirements

• Definition and classification of coupling device types and classes (including commonly used design classes and alpha markings used for interchangeability and identification).
• Dimensional specifications for standard classes (mounting‑plate hole patterns, entrance widths, clearances and permitted tolerances).
• Mechanical strength and fatigue tests, post‑test acceptance criteria (no fracture, no excessive permanent distortion affecting operation).
• Requirements for locking and redundant locking mechanisms (automatic primary locks plus secondary/backup locks for many classes).
• Marking, identification and approval documentation required for components and for vehicles fitted with approved coupling components.
• Rules for measuring reference heights/positions for coupling heads under specified loading conditions (test load distribution and occupant/baggage mass placement rules).

Typical use and users

Used by vehicle manufacturers, component suppliers (couplings, drawbars, fifth wheels), type‑approval and technical services, test laboratories, certification bodies and regulatory authorities involved in vehicle homologation and component approval for road use. Also consulted by importers, fleet operators and designers of towing equipment to ensure legal compliance and safe interoperability.

Related standards

Closely related to and harmonised with UN/ECE Regulation No.55 (mechanical coupling components). Other related national and international references include standards and regulations on underrun protection, vehicle mounting dimensions, towing equipment for light vehicles (local GOST, ISO and national norms) and test procedures referenced within the document.

Keywords

mechanical coupling; towing coupling; drawbar; fifth wheel; trailer coupling; approval; type approval; tests; marking; GOST R; UN/ECE R55; towing eye.

FAQ

Q: What is this standard?

A: GOST R 41.55-2005 is the Russian GOST R publication that contains uniform provisions concerning mechanical coupling components of combinations of vehicles — essentially the national adoption/representation of technical requirements for towing couplings and associated components.

Q: What does it cover?

A: It covers definitions, classification, dimensional and strength requirements, specific test methods, locking requirements, marking and approval procedures for coupling components and for vehicles fitted with them. It implements provisions equivalent to UN/ECE Regulation No.55.

Q: Who typically uses it?

A: Vehicle and trailer manufacturers, towing‑equipment suppliers, test laboratories, certification/type‑approval authorities and regulatory compliance teams use it to design, test and certify coupling devices and to demonstrate conformity for road use.

Q: Is it current or superseded?

A: Catalog and vendor entries are inconsistent — some list the standard as active, others note it as withdrawn or replaced. For legal status and any later amendments/supersessions you should check the official Rosstandart registration/registry or national IUS bulletins for the latest standing before relying on it for certification or regulatory decisions.

Q: Is it part of a series?

A: Yes — it belongs to the family of vehicle regulations (GOST R 41.x series) that mirror UN/ECE vehicle regulations (e.g., standards addressing underrun protection, external projections, coupling devices etc.) and is commonly grouped with other GOST R/UNECE provisions for vehicle component approval.

Q: What are the key keywords?

A: mechanical coupling, towing coupling, fifth wheel, drawbar, approval, tests, marking, GOST R, UN/ECE R55.