ISO 16123-2025 PDF

Full title and description

St ISO 16123-2025 — Ships and marine technology — Marine cranes — Slewing bearings. This International Standard specifies requirements for the classification, designation, inspection, testing methods, marking, packaging, transportation, storage, installation and maintenance of slewing bearings intended for use in marine cranes.

Abstract

This standard applies to the design, manufacture and acceptance of slewing bearings for marine cranes intended to operate at ambient temperatures not lower than −40 °C. It defines types and structural compositions, technical and inspection requirements (materials, load ratings, geometry, accuracy, sealing and lubrication), test and inspection methods (hardness, ultrasonic testing, dimensional and rotation accuracy, gear inspection), and provisions for marking, packaging, transport and maintenance.

General information

• Status: Published.
• Publication date: March 2025 (published 24 March 2025 in ISO catalogue entries).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 47.020.40 (Ships and marine technology).
• Edition / version: Edition 1 (first edition, 2025).
• Number of pages: 17 pages.

Scope

ISO 16123:2025 specifies classification, designation and technical acceptance requirements for slewing bearings used in marine cranes and sets out inspection and test methods, marking, packaging, transport, storage, installation and maintenance requirements. It is applicable where ambient operating temperature is not lower than −40 °C. The scope is focused on bearings for shipboard/outfitting deck and floating cranes rather than shore-side or non-marine applications.

Key topics and requirements

• Classification and designation of slewing-bearing types (single-row four-point contact ball, double-row ball, three-row cross-roller, internal/external gear types).
• Technical requirements: load ratings (static and dynamic), permitted materials for rolling elements and rings, tolerance and accuracy classes, gear and raceway specifications, residual magnetism limits.
• Component specifications: rolling elements, bearing rings, cages/separators, sealing rings, oil cups and gears.
• Inspection and test methods: hardness testing, ultrasonic testing for ring integrity, surface-crack detection, impact energy tests, dimensional tolerances, rotation and gear-accuracy checks.
• Lubrication, sealing and maintenance provisions for marine environments.
• Marking, packaging, transport and storage requirements intended to preserve bearing integrity until installation.

Typical use and users

Primary users are marine-crane designers and manufacturers, shipyards, bearing manufacturers and suppliers, classification societies, test laboratories and maintenance/inspection teams responsible for outfitting and deck machinery. The standard supports procurement specifications, factory acceptance testing and in-service maintenance regimes for slewing bearings used in shipboard and floating crane equipment.

Related standards

ISO 16123:2025 complements existing marine-crane standards and test/maintenance documents developed under ISO/TC 8/SC 4, including ISO 19356 (Marine cranes — Test specifications and procedures), ISO 19355 (Marine cranes — Structural requirements), ISO 21132 (Operation and maintenance requirements) and ISO 21125 (Manufacturing requirements). These documents cover broader crane structural, testing and operational aspects that interface with the slewing-bearing requirements in ISO 16123.

Keywords

slewing bearing; marine crane; slewing ring; raceway; rolling element; cross-roller; load rating; inspection; ultrasonic testing; gear accuracy; lubrication; ISO 16123.

FAQ

Q: What is this standard?

A: ISO 16123:2025 is an international standard that sets requirements for slewing bearings used in marine cranes, covering designations, technical requirements, inspection and testing, marking, packaging, transport, storage, installation and maintenance.

Q: What does it cover?

A: It covers classification and designation of slewing-bearing types, component materials and geometry, load-rating methods, tolerance and accuracy classes, specific inspection and test methods (including hardness and ultrasonic testing), sealing and lubrication, and handling/packaging requirements for marine service.

Q: Who typically uses it?

A: Bearing manufacturers, crane and ship designers, shipyards, procurement/specification teams, classification societies, testing laboratories and maintenance engineers for marine and floating-crane applications.

Q: Is it current or superseded?

A: ISO 16123:2025 is the current, newly published first edition (2025). It is not listed as a supersession of an earlier ISO 16123 edition; users should confirm any future amendments or national adoptions through their national standards body.

Q: Is it part of a series?

A: ISO 16123:2025 sits within the suite of ISO/TC 8/SC 4 publications on marine cranes (structural, manufacturing, testing, operation and maintenance standards) and should be used in conjunction with those related crane standards.

Q: What are the key keywords?

A: Slewing bearing, slewing ring, cross-roller, rolling element, marine crane, load rating, inspection, ultrasonic testing, gear accuracy, lubrication, ISO 16123.