Overview
ISO 19457:2026 sets out internationally standardized boundary dimensions and tolerance values for roller blocks used as subassemblies in linear motion rolling bearings. The standard covers Types A to D, with additional guidance for Types E and F provided in an annex due to their more limited manufacturing base and the need for fixing parts. By establishing consistent terminology, dimensions, and tolerance classes, ISO 19457:2026 enables manufacturers, engineers, and users to specify and source interchangeable linear motion roller block components across diverse applications.
With the ongoing use of roller blocks for maintenance and spare parts in existing installations, this standard supports continued compatibility as technologies evolve towards alternative linear motion solutions, such as profiled rail guides covered by related ISO standards.
Key Topics
- Types of Roller Blocks Covered
- Types A, B, C (subtypes C1 metric, C2 inch), and D specified in detail
- Types E and F described in Annex A, require additional fixing parts, and have limited production
- Dimensions and Tolerance Values
- Defines boundary dimensions for width, height, length, and mounting surface placement
- Four classes of tolerances for manufacturing precision: G (Normal), E (High), D (Precision), and C (Super Precision)
- Terms and Definitions
- Establishes consistent terminology for critical elements such as roller block body, roller holding part, mounting surfaces, and rolling surfaces
- Mounting and Configuration
- Recommendations for adjacent mounting surfaces and tolerancing of interfacing parts are included, aiding reliable assembly and alignment
- Symbol Conventions
- Details standardized symbols and measurements aligning with other ISO bearing standards
Applications
Roller blocks designed to ISO 19457:2026 are widely used in machinery and equipment requiring precise, low-friction linear motion. Typical application areas include:
- Machine Tools: For high-precision linear guides, enabling accurate positioning and durability in harsh environments.
- Automation Systems: Supporting conveyor systems, pick-and-place equipment, and robotic axes.
- Industrial Production Lines: Ensuring consistent movement and replaceability of linear bearing subassemblies for ongoing maintenance.
- Replacement and Retrofitting: Facilitates sourcing of interchangeable components for legacy systems where original designs are still in use.
Standardized roller blocks reduce lead times, simplify inventory management, and foster reliable global procurement and supply. The dimensional and tolerance guidance ensures compatibility, not only within a manufacturer’s range but also across international suppliers.
Related Standards
To ensure interface compatibility and broaden usability, ISO 19457:2026 references several key standards:
- ISO 15241 - Rolling bearings - Symbols for physical quantities
- ISO 24393:2008 - Rolling bearings - Linear motion rolling bearings - Vocabulary
- ISO 12090-1 - Profiled rail guides for linear motion rolling bearings - Boundary dimensions and tolerances for series 1, 2, 3
- ISO 12090-2 - Profiled rail guides for linear motion rolling bearings - Boundary dimensions and tolerances for series 4, 5
- ISO 273 - Fasteners - Clearance holes for bolts and screws
- ISO 286-1/2 - Geometrical product specifications (GPS) - ISO code system for tolerances on linear sizes
Adoption of ISO 19457:2026, together with these related standards, enables manufacturers to deliver globally compatible rolling bearing solutions, improving efficiency and interoperability in linear motion technologies.