Koyo 39585/20 Tapered Roller Bearing, 63.5 x 112.712 x 30.162 mm

These Koyo single-row tapered roller bearings are inch series cone and cup pairs, with a few J series metric sizes. Items sized in inches are still widely used. Each bearing carries radial load and axial load in one direction at the same time and suits heavy loads and impact loads. The outer ring and the inner ring assembly separate, so mounting is easy. Radial load produces an axial component of force, so single-row bearings are normally used in a facing pair or as a matched set.

The range has 48 sizes, with bores from 19.05 to 95.25 mm. Inch series tolerances are to ABMA Section 19. 3 sizes (JL69349/10, JLM104948/10 and JLM506849/10) are J series metric bearings: the J prefix means they are not designed to ISO 355 and are produced to special tolerances. Koyo bearings are made by JTEKT Corporation.

Where this product is used

• Automobile front and rear wheels
• Transmissions and differential pinions
• Machine tool spindles
• Construction equipment
• Large size agricultural equipment
• Railway rolling stock speed reduction gears
• Rolling mill roll necks and speed reducers

Features

• Radial load and axial load in one direction in a single bearing, suited to heavy loads and impact loads
• Separable: cone and cup are mounted separately
• Single-row bearings are normally used facing one another in pairs, or as matched sets
• Inch series with tolerances to ABMA Section 19; three J series metric sizes with special tolerances
• Pressed steel cage as standard
• Allowable misalignment 0.0009 rad (3')
• Basic dynamic load ratings 28.9 to 316 kN and static 37 to 471 kN depending on size

Key specifications

Available sizes

Selecting the right option

Select by the cone and cup designation printed on the bearing, then confirm bore d, outside diameter D and overall width T in the table against your shaft and housing.

Dynamic equivalent radial load for a single-row bearing is Pr = Fr when Fa/Fr is e or less, and Pr = 0.4 Fr + Y1 Fa when Fa/Fr is greater than e. Static equivalent radial load is P0r = 0.5 Fr + Y0 Fa, and P0r is taken as Fr when it works out lower than Fr. The values of e, Y1 and Y0 for each size are in the variant specification.

When two single-row bearings are used together facing one another, radial load produces an axial component of force in each. Allow for it when calculating the dynamic equivalent radial load.

When the load is too small, slippage between the rollers and raceways can cause smearing. This also applies to matched pairs when Fa/Fr is greater than e. Consult JTEKT or AIMS Industrial for use under those conditions.

Some inch designations in the listing differ from the cone and cup numbers printed in the Koyo catalogue for the same size. Where that applies the variant specification shows the catalogue listing used. Confirm the numbers on your existing bearing before ordering.

Fitting and use

Check the mounting dimensions in the variant specification (da, db, Da, Db, ra, rb) for the shaft and housing shoulder sizes and fillet radius limits.

Set the clearance or preload between the facing pair to suit the application.

Related products

Also available from Koyo: the 30200 series metric range, the 30300 series metric range, the 30300 series steep angle range, the 32000 series rubber seal range and the 32000 series metric range.