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External seals for spherical plain bearings

External seals for spherical plain bearings

Seal	Illustration	Design characteristics	Suitability
Gap-type		Simple and economic, no wear, simple mounting	for maintenance-free bearings for small angles of tilt for high temperatures for moderately dusty environments for arrangements with bearings that rotate
Gap-type with grease		Simple and efficient with periodic relubrication	for bearings and rod ends requiring maintenance for small angles of tilt for rough conditions in the presence of sand, clay, slush etc.
V-shaped		Simple, lightly preloaded seal made of polyurethane (–40 to +100 °C, –40 to +210 °F) Good wear strength and resistance to grease, oil and other environmental influences	for contaminant exclusion for angles of tilt up to 2° for bearing arrangements with shaft diameters up to 300 mm for arrangements with bearings that rotate
V-ring		Elastic seal that sits on the shaft and turns with it, axial sealing lip made of acrylonitrile-butadiene rubber (–40 to +100 °C, –40 to +210 °F) or fluoro rubber (–40 to +200 °C, –40 to +390 °F) Good wear and chemical resistance	for contaminant exclusion for maintenance-free and grease-lubricated bearings for all shaft diameters for angles of tilt between 2 and 4°, depending on size for arrangements with bearings that rotate
Felt		Simple to install, good resistance to grease (–40 to +100 °C, –40 to +210 °F)	for dust and minor dampness exclusion for grease retention for large angles of tilt for all bearing sizes for arrangements with bearings that rotate
Radial shaft		Steel reinforced (either externally or internally) elastomer with a acrylonitrile-butadiene rubber lip (–40 to +100 °C, –40 to +210 °F) or fluoro rubber lip (–40 to +200 °C, –40 to +390 °F) Good wear resistance, good resistance to grease, oil and other environmental influences	for contaminant exclusion for grease retention for oil retention for small angles of tilt for all bearing sizes for arrangements with bearings that rotate
Radial shaft with an auxiliary dust lip		Steel reinforced (either externally or internally) elastomer with an acrylonitrile-butadiene rubber lip (–40 to +100 °C, –40 to +210 °F) or fluoro rubber lip (–40 to +200 °C, –40 to +390 °F) Good wear resistance, good resistance to grease, oil and other environmental influences	for highly contaminated environments for oil retention for small angles of tilt for bearings with a bore diameter d up to approx. 300 mm for arrangements with bearings that rotate
O-ring		Acrylonitrile-butadiene rubber (–40 to +100 °C, –40 to +210 °F) or fluoro rubber (–40 to +200 °C, –40 to +390 °F)	for reliable moisture exclusion for oil and grease retention for very small angles of tilt for slow oscillating movements
Profiled rubber with clamp and lock		Elastomer strip (–40 to +100 °C, –40 to +210 °F) Good wear resistance, good resistance to grease, oil and other environmental influences	for hermetically sealed bearing arrangements for slow oscillating movements. Initial oiling or greasing of faces reduces friction for small angles of tilt
Mechanical seals		Stainless steel rings and cup springs of acrylonitrile-butadiene rubber (–40 to +100 °C, –40 to +210 °F) Good wear resistance, good resistance to grease, oil and other environmental influences	for contaminant exclusion for oil and grease retention for small angles of tilt for arrangements with bearings that rotate
Spring steel washers		Set of washers for high temperatures. Excellent wear resistance, good chemical resistance	for contaminant exclusion grease exit vents needed in housing cover if grease used for small angles of tilt for arrangements with bearings that rotate
WARNING! Some of the external seals listed in this table can be made of fluoro rubber (FKM). Note that fluoro rubber gives off dangerous fumes at temperatures above 300 °C (570 °F) and can be hazardous if touched. As handling seals made of fluoro rubber constitutes a potential safety risk, the safety precautions must always be followed. For detailed information about the safety precautions, refer to www.skf.com/seals.

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