SKF
Specification for Low Cross Section Seals
Low cross section seals are a subset of SKF's heavy industrial radial shaft seals designed for installations where axial space is limited. They feature a reduced metal case thickness and a specially engineered lip geometry that provides full sealing function in a narrower envelope. Specification requires careful attention to the housing bore depth, the shaft radial clearance, and the maximum permissible speed, as the thinner lip has different dynamic characteristics. SKF provides detailed dimensional data and load/speed rating tables. These seals are used in compact gearboxes, high-speed spindle bearing housings, and anywhere a standard heavy seal cannot fit. Correct specification ensures space constraints do not force a trade-off against reliability.
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Trusted by Industry Leaders
Narrow Axial Width
Up to 30% thinner than standard seals.
Full Sealing Performance
Lip design maintains normal radial load and follow.
Standard Shaft and Housing Dimensions
Drop into existing grooves, saving redesign.
Reduced Housing Mass
Enables more compact gearbox and motor designs.
Material Options
NBR, FKM, HNBR in the same narrow profile.
Tested for High‑Speed and Temperature
Validated to normal heavy‑duty limits.
Fitting a Low Cross Section Seal Into a Compact Electric Motor
To meet IE5 efficiency targets, the motor needed a shorter bearing arrangement. The low cross section seal saved 5 mm of axial space, allowing a larger, more efficient bearing within the same overall motor length, without sacrificing sealing integrity.
Installation Precautions for Thin‑Wall Seals
The reduced case stiffness demands a chamfered housing bore and a perfectly square installation tool. Twisting during press‑fit will distort the thin case and cause the lip to mis‑track on the shaft. SKF provides a stepped installation mandrel that supports the seal body and guides it squarely into the bore.