BS ISO 7425-1:2021 pdf free download.Hydraulic fluid power cylinders一Dimensions and tolerances of housings for elastomer- energized, plastic-faced seals. 5.2 Axial length For axial lengths for the nominal piston diameters, see Table 3. If the extrusion gap exceeds the capabilities of the plastic-faced material to bridge such a gap, length L2 should be selected and back-up rings (anti-extrusion rings) used (see...
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