Koyo 6900 series, 90 x 125 x 18

This Koyo deep groove ball bearing (non-contact sealed, 6900 series) is built on the most popular rolling bearing type. Deep, uninterrupted raceway grooves in the inner and outer rings carry radial load and a certain degree of axial load in either direction, at high speed. It carries a non-contact rubber seal on each side (2RU type) and is pre-lubricated, so no greasing is needed.

The range has 7 sizes, with bores from 60 to 120mm, normal (CN) radial internal clearance and boundary dimensions to JIS B 1512. Koyo bearings are made by JTEKT Corporation.

Where this product is used

• Automotive: transmissions, electrical devices, and truck and trailer equipment
• Off-highway: construction equipment, agricultural equipment and railway rolling equipment
• Electrical equipment: standard motors and domestic electric appliances
• Measuring and medical instruments
• General industrial equipment

Features

• Deep, uninterrupted raceway grooves carry radial load and a certain degree of axial load in either direction
• Non-contact rubber seals (2RU) on both sides: small friction torque, good high speed performance and better sealing than the ZZ shield
• Boundary dimensions to JIS B 1512, tolerances to JIS B 1514-1
• Basic dynamic load ratings 20.2 to 57.2 kN and static 17.3 to 56.9 kN depending on size
• Standard cage by size: pressed steel and machined copper alloy

Key specifications

Available sizes

Fitting and use

Fit the ring that has the interference fit first, and press only on that ring, never through the balls.

Do not relubricate: the bearing is pre-lubricated with an appropriate volume of grease. The standard type runs from -30°C to +110°C.

Where axial load is large, make the shaft shoulder and housing shoulder larger than usual.

Choosing the right option

Select by bore d first, then check the outside diameter D and width B in the specifications against your housing.

The basic dynamic load rating Cr relates to bearing life under rotating load, and the basic static load rating C0r to heavy or slow-turning duty. Compare the limiting speed for your size with the shaft speed. The speeds shown are the grease lubrication limits.

The 2RU non-contact seal has small friction torque and good high speed performance, with better grease sealing and dirt resistance than the ZZ shielded type.

Shielded and sealed bearings are designed for use with the inner ring rotating.

Also available from Koyo: the 6900 shielded range, the 6900 contact sealed range, the 6800 non-contact sealed range.