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Product/technological information
4. Types and Characteristics of Cages, Shields and Seals
Cages
W：One-piece Steel Snap Type
The snap type is made by integrally molding stainless steel in press processing. And the inner ring guided design realizes extremely high performance with low torque during low speed rotation.
Standard ball diameter: φ0.5 - φ1.588
J：Two-piece Steel Ribbon Type
For the ribbon type, a ball shaped pocket consists of two parts including a lid side and a claw side, to match the shape of the balls. Generally, this type is ball guided and designed for reducing friction torque during rotation.
Standard ball diameter: φ1.2 - φ4.762
RJ：Two-piece Steel Rivet Type
This type is suitable for larger bearings with high loads applied. Two ribbon shaped parts are riveted together to provide strength against vibration and acceleration. This type is ball guided and designed for reducing the friction torque during rotation.
Standard ball diameter: φ4.762 or larger
TW：One-piece Nylon Snap Type
The molded nylon cage is ball guided and can endure high-speeds with less fluctuation in the running torque. In addition to the standard type made from 66 nylon, a stronger material containing glass fiber is also available. Operating temperature range (-30 to +120 ºC).
Standard ball diameter: φ1.2 - φ9.525
V：Full complement of balls
This type, for low-speed applications, incorporates the maximum number of balls allowed in design to endure a heavy radial load without use of a cage. It can only bear a small axial load because a slot groove is located on the outer ring and the inner ring, respectively.
Shields and Seals
ZZ：Pressed-steel shields
Root shield
Curl shield
Consists of a structure that presses the steel shields into the outer ring. There is little grease leakage and less intrusion of external contaminants.
ZZS：Steel shields with snap rings
Consists of a structure where steel shields are retained in the outer ring with snap rings. There is less intrusion of external contaminants. This is mainly used for small bearings or thin-section bearings. There is less increase in torque, noises and temperature.
TTS：Teflon seals with snap rings
Consists of a structure where teflon seals reinforced with glass fiber are retained in the outer ring with snap rings. There is less intrusion of external contaminants. This is mainly used for small bearings or thin-section bearings. This structure allows the seal to breathe along with the change in the internal pressure.
Limited operating temperature range: -100 to +260 ºC
2RS：Contact rubber seals
Radial contact
Axial contact
Consists of a structure where rubber seals are fitted in the outer ring. Since the rubber seal contacts the inner ring, there is very little intrusion of external contaminants. Mainly, NBR is used for the seal material. Limiting operating temperature range: -40 to + 120℃.
A fluoro rubber (FKM) type is also available for high temperatures. Limited operating temperature range: -30 to +230℃.
2RU：Non-contact rubber seals
Consists of a structure where rubber seals are fitted in the outer ring. The rubber seal does not contact the inner ring, and there is also less intrusion of external contaminants. There is less increase in torque, noise and temperature. Mainly, NBR is used for the seal material. Limiting operating temperature range: -40 to + 120ºC.