Seal Designation

Felt Seals: (1) FS XXX for SN housings where the digits following FS denote the length in mm. In SN housings, no separate suffix is used to denote felt seals (see fig. 1).

(2) TSNA XXXC for SNA housings denotes a set of 4 felt seals and 4 Aluminium split rings to be fitted in the housing end grooves (see fig. 1A). The digits are same as used in housing designation. Complete SNA Housing fitted with such seals will have a suffix TC, e.g. SNA 505 TC.

‘V’ Ring Seals: TSNA XXX A for SNA housings denotes a set of 2 ‘V’ Ring seals and a pair of aluminium discs to be fitted in the housing end grooves (see fig. 2). The digits are same as used in housing designation.

Complete SNA housings fitted with such seals will have a suffix, TA, e.g. SNA 509 TA.

Double Lip Seals: TSNA XXX G for SNA housings denotes a set of two double lip seals of polyurethane to be fitted in the housing end grooves (see fig. 3). The digits are same as used in housing designation.

Complete SNA housings fitted with such seals will have a suffix TG, e.g. SNA 509 TG.

Labyrinth Seals: (1) TS XX for SN/SD type housings to be fitted with bearings and adapter sleeves, denotes horizontal labyrinth seals complete with ‘O’ Rings to be fitted on the shaft under the housing end grooves (see fig. 4 & 4A).

The digits are the last two numbers in the bearing housing designation.

Fig. 1A – Labyrinth Seal <& End Cover

(2) TS XXX for SN housings to be used with bearings having cylindrical bore as well as SNA type housings.

The digits are same as used in housing designation.

Complete bearing housing designation for both the above cases will have a suffix TS., e.g. SD 3134TS.

(3) LER X or LER XX for SAF and SDAF type housings denoted horizontal type labyrinth seal to be fitted on the shaft under the housing end grooves (see fig. 4). In SAF and SDAF type housings no separate suffix is used to denote labyrinth seals.

Taconite Seals: TER or TER XX for SAF and SDAF type housings denotes Taconite Seals. These can be of two types :

(1) Contact Seal – No additional Suffix (see fig. 5).

(2) ‘V’ Ring Seal – TER XV or TER XXV (see fig. 6).

Complete bearing housing designation when fitted with taconite seals of contact type will carry a suffix T e.g. SAF 517 T. Similarly, complete bearing housing designation, when fitted with taconite seals of ‘V’ ring type will carry a suffix TV, e.g. SAF 517 TV.

End Cover Designation:

For shaft ends, end covers are normally used in place of seals. For this, the following designations are used :

(1) ETS XX for SN/SD type housings suitable for bearings having tapered bore and mounted on adapter sleeves, denote a cover with ‘O’ Rings to be fitted in the housing end grooves (see fig. 1A). The digits will be same as for labyrinth seals. Complete bearing housing of SN type fitted with one end cover will have a suffix E, e.g. SN 509 E.

Complete bearing housing of SD type fitted with one end cover will have a suffix A before the suffix for seals, e.g. SD 3134 ATS.

(2) ETS XXX for SN type housings suitable for bearings having cylindrical bore, denote a cover with ‘O’ Rings to be fitted in the housing end grooves. The digits will be same as for housing designation.

(3) ASNA XXX for SNA type housings denotes a cover to be fitted in the housing end groove. Complete bearing housing fitted with one end cover will have a suffix A before the suffix for seals, e.g. SNA 612 ATA.

(4) EPR X or EPR XX for SAF and SDAF type housings denotes a cover with ‘O’ Rings to be fitted in the housing end grooves.

(5) End covers for SOFN/SBD series are not supplied as spares as they are part of the housing design. Housings of these series with one end closed will, however, be designated by a suffix ‘A’.