ISO/FDIS 19457

ISO/TC 4/SC 11/WG 4 N161
Secretariat: ASI SAC
2025-10-22
Date: 2026-01-20
Rolling bearings — — Roller blocks as subassemblies for linear
motion rolling bearings — Boundary dimensions and tolerance
values
Roulements — Roulements pour mouvement linéaire, sous-ensembles, patin à rouleaux — Dimensions
d'encombrement et valeurs de tolérance
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ISO/DISFDIS 19457:20242026(en)
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ii
Contents
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 5
5 Designs and types . 6
6 Boundary dimensions . 11
7 Tolerance values . 14
Annex A (informative) Roller block Type E and roller block Type F . 16
Annex B (informative) Configurations of roller blocks . 21
Annex C (informative) Recommendations on adjacent mounting surfaces . 23
Bibliography . 25

iii
ISO/DISFDIS 19457:20242026(en)
Foreword
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This document was prepared by Technical Committee ISO/TC 4, Rolling bearings, Subcommittee SC 11, Linear
motion rolling bearings.
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iv
Introduction
Linear motion rolling bearing subassemblies as standardized in this document are a product that has been on
the market for several decades. It is projected that these products will become less important in future
technology. However, in some application areas there is still a need for spare parts.
The designs with profiled rail guides and linear motion rolling bearings in ISO 12090-1 and ISO 12090-2 can
replace the roller block design given in this document.
The title of this document applies the classification of linear motion rolling bearings as defined in ISO
24393:2008, Annex A, see Figure 0.1.

Figure 0.1 — Roller blocks arranged in systematic classification of linear motion rolling bearings
v
Final Draft International Standard ISO/FDIS 19457:2025(en)

Rolling bearings — Roller blocks as subassemblies for linear motion
rolling bearings — Boundary dimensions and tolerance values
1 Scope
This document specifies the boundary dimensions and tolerances for Types A to D of roller blocks.
Types E and F of roller blocks are given in Annex Athe informative Annex A. They require fixing parts and are
not yet produced on a broad manufacturer base.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 15241, Rolling bearings — Symbols for physical quantities
ISO 24393:2008, Rolling bearings — Linear motion rolling bearings — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 24393:2008 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— — ISO Online browsing platform: available at https://www.iso.org/obp
— — IEC Electropedia: available at https://www.electropedia.org/
3.1 3.1
roller block
linear roller bearing
linear bearing subassembly consisting of roller block body and a number of closed loops of recirculating
rollers, which are designed to achieve unlimited motion along a flat rail or flat guideway
Note 1 to entry: An example of a roller block is illustrated in Figure 1Figure 1.
[SOURCE: ISO 24393:2008, 03.01.07]
Key
1 roller block body (3.2(3.2))
2 rollers
3 roller holding part (3.3(3.3))
Figure 1 — Example of a roller block with exploded view
3.2 3.2
roller block body
cuboid part having rectangular cross-section of a roller block with one or more raceways on one of its outside
surfaces and supporting load
Note 1 to entry: See Figure 1Figure 1.
[SOURCE: ISO 24393:2008, 04.01.07 modified – The additions “having rectangular cross-section” as well as
“and supporting load” have been added. "Basically" has been removed.]
3.3 3.3
roller holding part
parts of roller block except rollers and roller block body which together retain and guide the rollers in a
recirculation path
Note 1 to entry: See Figure 1Figure 1.
3.4 3.4
mounting surface
surface of the roller block which is fixed to the adjacent construction
Note 1 to entry: See Figure 2Figure 2.
a) Roller block Type A
b) Roller block Type B
c) Roller block Type C
d) Roller block Type D
e) Roller block Type E
f) Roller block Type F
Key
1 mounting surface
Figure 2 — Mounting surfaces of roller blocks
3.5 3.5
rolling surface
plane theoretically tangential to the cylindrical surfaces of rollers
Note 1 to entry: See Figure 3Figure 3.

Key
1 rolling surface
Figure 3 — Rolling surface
4 Symbols
For the purposes of this document, the symbols given in ISO 15241 and the following apply, see
Table 1Table 1.
The symbols (except those for tolerances) shown in Figures 4Figures 4 to 77 and the values given in
Tables 2Tables 2 to 66 denote nominal dimensions, unless specified otherwise.
Table 1 — Symbols
Symbol Description Unit
B Overall width of roller block mm
B Width of roller holding part mm
H Height from mounting surface to rolling surface mm
H1 Height of roller block from mounting surface to rolling surface mm
h Overall length of bolt hole mm
h Height of mounting flange mm
J Centre distance between mounting bolt holes (width) mm
J1 Centre distance between mounting bolt holes (length) mm
L Length of roller block mm
L Length of mounting flange mm
L2 Length of mounting surface mm
M Designation of internal screw thread for mounting bolts -
N Diameter of mounting bolt holes mm
Symbol Description Unit
a, b
V Variation of the sorting height µm
HmL
V Variation of height from mounting surface to rolling surface µm
Hs
ΔBsÄBs Deviation of overall width of roller block µm
ΔB1sÄB1s Deviation of width of roller holding part µm
b b
Δ Ä Deviation of the mean height from mounting surface to rolling surface µm
HmL HmL
Δ Ä Deviation of height from mounting surface to rolling surface µm
Hs Hs
ΔH1sÄH1s Deviation of height of roller block µm
ΔJsÄJs Deviation of centre distance between mounting bolt holes (width) µm
ΔJ1sÄJ1s Deviation of centre distance between mounting bolt holes (length) µm
Δ Ä Deviation of length of mounting flange µm
L1s L1s
a Difference between the mean heights of the highest and the lowest roller block in a height sort.
b Letter “L” indicates “lot”.
5 Designs and types
The different designs and types of roller blocks are given in Figures 4Figures 4 to 77.
NOTE 1 Figures 4   Figures 4 to 77 only show examples of designs, e.g. rollers can be arranged in single-row, double-
row or as grooved rollers.
NOTE 2 Configurations of roller blocks are shown in Annex B, Table B.1Annex B, Table B.1.
The internal design of roller blocks is at the discretion of the manufacturer.
...