FAG1209TVDouble Row Self-Aligning Ball Bearing 45x85x19 mm, Straight Bore, Polyamide Cage, Open Both Faces

Product Description

What this part is

A FAG 1209.TV double-row self-aligning ball bearing — 45 mm bore, 85 mm outside diameter, 19 mm width, straight cylindrical bore, open on both faces. Two rows of balls run in a single spherical outer raceway, so the inner ring and ball set can swivel inside the outer ring. The bearing therefore accepts angular misalignment between the shaft and its housing without picking up edge loads.

Decoding the designation

1209 – double-row self-aligning ball bearing, 45 mm bore, 85 mm OD, 19 mm width, straight bore
TV / TVH – glass-fibre reinforced polyamide cage
No K suffix, so the bore is cylindrical rather than the 1:12 taper of a 1209-K
No clearance suffix, so internal clearance is normal (CN)
No closure suffix, so both faces are open

What these specs mean in practice

The spherical outer raceway is the whole point of the 1200 series. On a long shaft, a welded frame, or a pair of housings bored in separate operations, the angular error that would edge-load a rigid bearing is simply absorbed by the inner ring tilting. The price of that freedom is low axial capacity, since the balls can climb the spherical race rather than resist thrust, so this bearing supports the shaft radially and axial location comes from elsewhere. The polyamide cage runs quietly, has low mass, and is rated for continuous service to 120 °C, above which a steel or brass cage is required.

Published specifications

Bore: 45 mm (1.7717 in), straight cylindrical
Outside diameter: 85 mm (3.3465 in)
Width: 19 mm (0.7480 in)
Rows: 2
Rolling elements: balls
Cage: glass-fibre reinforced polyamide
Cage temperature ceiling: 120 °C continuous
Internal clearance: CN (normal)
Closure: open both faces
Self-aligning: yes, spherical outer raceway

Quantity and configuration

Sold as 1 Pc, one complete bearing, open on both faces.

Fitting notes

The bearing mounts directly onto a cylindrical shaft seat, with force applied to the ring being fitted. The housing bore is a plain cylindrical seat, since the misalignment capability is internal to the bearing. Axial location of the shaft comes from the second bearing position or a shoulder. The open faces take lubricant from the housing cavity, packed to roughly one third of its free volume for grease service.

Interchange guidance

The direct equivalent is a straight-bore double-row self-aligning ball bearing in the 45 x 85 x 19 mm envelope with a polyamide cage: SKF 1209 ETN9, NSK 1209TN, NTN 1209, Koyo 1209. The 1209-K variant has a 1:12 tapered bore and mounts on an H209 adapter sleeve, so it is a different part in the same envelope. A 6209 deep groove bearing is rigid and is not an interchange where misalignment must be absorbed.