ZWA Compatible Pedestals

Pedestals for Standard Type Bearings and Cartridges

ZWA SNC500， SAFC500 and SDC3100 series pedestals are designed for use where interchangeability with sn500, saF500 and sd3100 series pillow block units is required. respectively.  they may be used to economically replace existing solid bearings. Or may be incorporated into new machinery where the envelope dimensions of these units are desirable.

The ZWA pedestals have bolt hole spacings and heights to centres corresponding to the equivalent industry standard units far solid bearings. However the footprint, overall pedestal height and length on shaft may differ and should be checked against the available space.

ZWA SNC500, SAFC500 and SDC3100 pedestals are designed to incorporate ZWA bearings housed in cartridges (refer to page 515),which gives these units the benefit of superior ZWA sealing and the option of many different seal types.

The tables on the following pages list the ZWA pedestals with the bearing and cartridge unit of the same bore size as the solid bearing that is commonly found mounted in the equivalent pillow block unit on a parallel shaft with an adaptor sleeve. These pedestals may also be used with alternative sizes of ZWA bearing.  Where the bearing and cartridge unit listed with the ZWA pedestal on the following pages is used in the same size of standard ZWA pedestal as another size of ZWA bearing and cartridge, generally this alternative size of bearing and cartridge can be used in the same ZWA SNC500, SAFC500 0r SDC3100 series pedestal.

For example:

01E BC SNC513 60M incorporates an OIE B 60M bearing and an 01 C 60M cartridge.

01 C 60M is usually housed in a P03 pedestal (by reference to pages 521 and 522)

Other bearings and cartridges are also housed in P03 pedestals, including:

100 C 75M

01  C 65M

02  C 50M

All of these can alternatively be housed in a ZWA SNC513 pedestal.

SNC500 pedestals are manufactured from grey iron as standard. SAFC500 and SDC3100 pedestals are manufactured from ductile iron as standard.

The permissible loading on these pedestals is as for standard grey iron pedestals, as described on page 522. Where special dispensation to load outside the envelope specified on page 522 has been given for standard pedestals, this does not necessarily apply to SNC500, SAFC500 0r SDC3100 series pedestals. please consult our technical department if other loading conditions are required to be met.

Heavy Duty 08 Series SDC Pedestal Units

The heavy duty ZWA 08SDC Series pillow blocks housing ZWA 08 series bearings are intended to interchange with SD3100 Series in applications where higher capacity is required than the ZWA 01 Series, but the SDC3100 envelope is too restrictive to incorporate a standard ZWA 02 Series bearing and cartridge in a compatible pedestal.

The ZWA 08 series is based on the ZWA 02 Series but has a spherically-backed outer race mounted directly into the pedestal. the 08 Series is completely split to the shaft as per the 02 Series. the two halves of the outer race are screwed together and have alignment features to ensure that an accurate roller path is maintained across the outer race joint.

The 08 Series bearings for mounting in 08SDC Series pedestals is produced in fixed ( `GR` ) and expansion ( `EX` ) versions.  the GR version uses lips on the outer race and on the inner race clamping rings to provide axial location to the rollers. the EX version uses a lipped outer race and plain inner race which allows the rollers to spiral across it with virtually no resistance to axial movement. this is similar to the EXILOG configuration (see page 470), except that the available axial movement is not necessarily as great and the outer race has a spherical outside diameter.

The pedestal ends are closed by removable end covers. These allow access to the seals without disturbing the bearing. and allow access to the clamping ring screws for maintenance or bearing change-out purposes even if the shaft has stopped with the inner race in an inconvenient position and cannot be turned. the end covers are interchangeable between pedestals to allow change to different seal type if required, or replacement in the event of damage.

The maximum misalignment between the shaft and pedestal axes is less than with ZWA 01 0r 02 Series based units as the seals do not move with the bearing. However, the flexible packing seal which will be found suitable for many applications is designed to allow a reasonable amount of misalignment by virtue of its large section and flexible core. additional clearance is present in the TL seal version compared to our standard TL seals.

The three standard sealing options available with the 08SDC series are illustrated on page 563.

08SDC SD Compatible Pedestals

Sealing options

Flexible Packing seal（FP）

Aramid braid wound around a fexible polymeric core to accommodate misalignment between the shaft and pedestal. suitable for general dry applications, including materials handling.

Temperature limits      -20℃ to 100℃

Maximum speed           50,000 dn(mm)

Maximum misalignment    0.25°

Shaft surface fnish     1.6μm Ra（max, roughness）

Synthetic rubber single lip（SRS）

High temperature version (SRS HT)

Low temperature version (SRS LT)

Suitable for wet but not submerged conditions.

Temperature limits  SRS          -20℃ to 100℃

                    SRS HT       -20℃ to 175℃

                    SRS LT       -60℃ to 100℃

Maximum speed                    150,000 dn(mm)

Maximum misalignment             0.25°

Shaft surface fnish              0.8μm Ra（max, roughness）

Aluminium triple labyrinth（ATL）

High temperature version （ATL HT）

Low temperature version  （ATL LT）

Machined aluminium-bodied triple labyrinth seal capable of high speed operation often used on fans.

temperature limits      ATL      -20℃至100℃

                        ATL HT   -20℃至175℃

                        ATL LT   -60℃至100℃

Maximum speed           Bearing maximum

Maximum misalignment    0.5°

Shaft surface fnish     3.2μm Ra（max. roughness）