BS ISO 6195:2021 pdf download.Fluid power systems and components — Cylinder- rod wiper-ring housings in reciprocating applications — Dimensions and tolerances.
1 Scope
This document specifies dimensions and tolerances of housings for wiper-rings used in reciprocating
rod applications for fluid power cylinders. The range of rod diameters is from 4 mm to 450 mm.
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 4287:1997, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Terms, definitions and surface texture parameters
ISO 5598, Fluid power systems and components — Vocabulary
3? Terms? and? definitions
For the purposes of this document, the definitions given in ISO 5598 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
4 Symbols
The symbols used in this document are as follows:
a roughness of the side surface of the wiper housing
b roughness of the surface of the wiper housing bore
C axial length of the lead-in chamfer
C0 reference material ratio level (see ISO 4287:1997, 4.5.4)
d rod diameter
D 1 outside diameter of wiper housing
D 2 retainer diameter
e roughness of the rod
f roughness of the leading chamfer
L 1 axial length of the wiper housing
6.2 Type B housing
6.2.1 Type B housing and a typical wiper-rings are shown in Figure 3.
6.2.2 Type B housing dimensions and tolerances shall conform to Table 2.
6.2.3 Type B wiper-rings are recommended for use with cylinders conforming to ISO 6020-1 and
to ISO 6022.
6.5 Type E housing
6.5.1 Type E housing and a typical wiper-ring are shown in Figure 6.
6.5.2 Type E housing dimensions and tolerances shall conform to Table 5.
7 Other requirements regarding dimensions
7.1 Reference shall be made to Figures 2, 3, 4, 5 and 6 for the location of the lead-in chamfer, C, on the rod end.
7.2 The rod-end chamfer shall make an angle of between 20° and 30° with the axis.
7.3 The length of the rod-end chamfer shall not be less than specified in Table 6.
7.4 The housing lead-in chamfer dimensions for Type B housings shall conform to Figure 3.
8 Surface roughness
8.1 The surface roughness of the wiper housing and any mating part has a significant impact upon the life and sealing performance of the wiper.
8.2 Unless otherwise agreed, surface roughness values shall be in accordance with Table 7.
8.3 Unless otherwise agreed, the material ratio, Rmr of housing surfaces that are in mating contact with the seal should be between 50 % and 80 % at a profile section level (Rδc) of 25 % of Rz, from a reference level, C0, of 5 % Rmr (in accordance with ISO 4287:1997 4.5.4).BS ISO 6195 pdf download.