Stenso - Hovedkatalog 2019

Hardened steel is most commonly used for shafts. Process tolerance is h1 1 in accordance with ISO STANDARD UNI-6388-68 (see table). Shaft diameter Tolerance 10 18 0,000 - 0,110 18 30 0,000 - 0,130 30 50 0,000 - 0,160 50 80 0,000 -0,190 6 10 0,000 - 0,090 Shaft diameter Tolerance from to (mm) h11 120 180 0,000 -0,250 180 250 0,000 -0,290 250 315 0,000 - 0,320 315 400 0,000 - 0,360 120 0,000 -0,220 It is therefore important to place the shaft seal as close as possible to the bearing to keep run-out as low as possible for the seal. Eccentricity between shaft and housing bore should be as low as possible. This significantly reduces unilateral loading / stress (wear) of the sealing lip from to (mm) h11 The most convenient operational conditions are those, when the shaft is perfectly centred and concentric with respect to the axis of the radial shaft seal, while turning. Naturally, this does not always occur and some radial run-out is inevitable. This should be minimised since there is a danger , particularly at high temperatures, that the sealing edge cannot follow the shaft on account of its inertia. 302 80 Concentricity Tolerance of Shaft Allowable Eccentricity (mm) Allowable Eccentricity (mm) Eccentricity between Shaft and Housing Bore Rotational frequency of rotating Shaft Shaft diameters Radial Lip Seal