![]() Seal face surface finish depends very much on the material – about 0.25 μm R a (10μ in cla) for carbon/graphite to about 0.05 μm R a (2 μin cla) for hard faces. Seal face flatness is usually better than two or three helium light bands (0.6 or 0.9 μm) per 25 mm of working face diameter. Where the sliding packing passes over the shaft a 10° chamfer and lead-in, free from burrs should be provided. Shaft surface finish should be better than 0.8 μm R a (32 μin cla) except where PTFE wedge packings are used which require better than 0.4 μm R a (16 μin cla) and preferably a corrosion resistant surface (Stellite) on which to slide. Shaft tolerances should be within ☐.05 mm (☐.002 in) and where PTFE wedge packings are used must be round within 0.01 mm (0.0005 in). ![]() ![]() In Tribology Handbook (Second Edition), 1995 Installation and allowable malalignments ![]()
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