FAG52217Double-Direction Thrust Ball Bearing – 70 mm Bore, 125 mm OD, 55 mm Height, Open, Sheet Steel Cages, 90° Contact Angle, P0

Product Description

What this part is

A FAG 52217 double-direction thrust ball bearing, also catalogued by Schaeffler as an axial deep groove ball bearing. It carries pure axial load in both directions at moderate speed. The assembly is made up of one centre shaft washer, two housing washers and two ball and cage assemblies, all of through-hardened bearing steel with pressed sheet steel cages.

Decoding the designation

The 522 prefix is the double-direction thrust series with flat housing locating washers. The trailing 17 is the bore code: the centre shaft washer bore is 70 mm. The housing washer bore is 85 mm, which is why the single-direction 51217 half of the same family measures 85 x 125 x 31 mm.

Dimensions

Centre shaft washer bore 70 mm (2.7559 in). Outside diameter 125 mm (4.9213 in). Total height 55 mm (2.1654 in). Housing washer bore 85 mm. Mass 2.23 kg.

What these specs mean in practice

The 90° contact angle puts the whole load path along the shaft axis, which is what gives this bearing a 250 kN static rating on a 125 mm outside diameter — far more axial capacity than an angular contact bearing of the same envelope. The trade is speed and radial capability: the limiting speed is 3000 rpm and radial load is carried elsewhere in the assembly. Dynamic rating is 98 kN, with a fatigue limit load of 10.9 kN.

Quantity and configuration

1 Pc, supplied as the complete double-direction assembly. Open on both faces, standard internal clearance, P0 running accuracy.

Fitting notes

The centre shaft washer seats on the 70 mm shaft and the two housing washers locate in the housing bore against square abutment faces. Both housing washers are flat, so the housing seats must be perpendicular to the shaft axis; the sphered-washer alternative in this envelope is the 53217. A minimum axial load keeps the ball sets in contact and prevents skidding at speed.

Interchange guidance

52217 is an ISO dimension-standard number, so the SKF, NSK, NTN and Koyo 52217 are direct interchanges on envelope and rating class. The 51217 is one single-direction half of this bearing and takes thrust one way only, on an 85 mm shaft seat — a related size rather than a substitute.