Additional design options, SKF Flex seals
Large-diameter seals built from a continuous profile rather than moulded in one piece. The profile is cut to the measured circumference and joined, so almost any diameter can be supplied without tooling. SES holds the range as an authorised SKF distributor, covering profile forms Several lip geometries and cross-section heights; materials NBR, HNBR and FKM depending on media and temperature; joining Vulcanised or bonded joint made to the measured circumference; sizing input Shaft diameter, housing bore, available axial width. Executions include standard lip profile, dust-excluding profile with auxiliary lip, spring-loaded profile, grease-purged double profile, among others. It is specified most often into mill and kiln trunnion seal positions and large slew ring and turntable bearings on stackers and reclaimers. Every part is genuine SKF through official channels, with designation, specification and options confirmed against your duty before it ships — supplied from Kolkata and our branch network, with breakdown cover that does not sit in an inbox.
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Build
Extruded profile, cut and joined to length
Diameters
Very large, well beyond moulded seal tooling
Lead time
Short — no mould required
Fitting
Solid ring or joined in position
Where it runs.
You will find Additional design options, SKF Flex seals in the parts of a plant where this particular duty actually occurs. In practice that means mill and kiln trunnion seal positions, large slew ring and turntable bearings on stackers and reclaimers, hydro turbine and generator shaft entries, and equally bulk material handling drum and pulley ends, heavy press ram and slide guides, dredger and winch drum shafts. What links them is the duty rather than the machine name — build: Extruded profile, cut and joined to length. If your installation is not on that list it matters less than you would think: the operating condition decides the specification. Send us the load, the speed, the running temperature and the environment it runs in, and we will match it to the right execution in the SKF range and confirm what is in stock.
Specify it against the duty.
Specification here follows the operating condition, not the catalogue. Diameter falls between two catalogue sizes — Give us the measured shaft and bore and take a profile seal cut to that figure. Stretching an undersized moulded seal thins the lip and shortens its life sharply. A one-off replacement is needed during a shutdown — The profile build, since no mould has to be made. Ordering a moulded large-diameter seal means tooling time you do not have mid-outage. The joint would sit at the bottom of the seal where oil collects — Position the joint at the top of the bore on assembly. A joint at the six o'clock position sits in standing oil and is the first place a weep appears. Where two of those apply at once, specify for the harsher of the two — under-specifying is what puts the part back on the bench a month later. Send us the duty and we will confirm the execution.
Ordering this from SES.
Measure the circumference with a steel tape around the shaft rather than calculating it from a diameter reading. On a large trunnion the two figures differ by several millimetres, and the seal is only as good as the number you send.