NACHI LM48548/10 Inch Tapered Roller Bearing 34.925 x 65.088 x 18.034 mm, Cone and Cup

The NACHI LM48548/10 is a single row inch series tapered roller bearing: cone LM48548 with cup LM48510. It measures 34.925 mm bore x 65.088 mm outer diameter x 18.034 mm overall width, with a basic dynamic load rating of 48 kN and a basic static load rating of 58.5 kN.

A tapered roller bearing carries combined radial and axial load. The cone (inner ring and roller assembly) and the cup (outer ring) are separable, and the internal clearance is set at mounting by the axial position of the cone relative to the cup. A single row bearing takes axial load in one direction, so for axial load both ways fit a pair, face-to-face or back-to-back.

The overall width of 18.034 mm is for the cone assembled with cup LM48510. The cone on its own is 18.288 mm wide and the cup is 13.97 mm wide. The same cone is also catalogued with cup LM48511A, which gives a different bearing with an overall width of 21.082 mm.

Where this product is used

• Industrial gearboxes and speed reducers
• Wheel hubs, axles and vehicle drive trains
• Transmissions and differentials
• Conveyor drives and general industrial machinery
• Equipment with combined radial and axial loads on one shaft

Features

• Inch series single row tapered roller bearing: LM48548/10 is cone LM48548 with cup LM48510
• Carries combined radial and axial load; the cone and cup are separable and the clearance is set at mounting
• Basic dynamic load rating 48 kN and static rating 58.5 kN, with limiting speeds of 6,000 rpm on grease and 8,000 rpm on oil
• Inch-dimensioned series made to ABMA (ANSI) standards

Key specifications

Selecting the right option

Inch series bearings are identified by their cone and cup numbers, so order and check both: this bearing is cone LM48548 with cup LM48510.

The cone LM48548 is also catalogued with cup LM48511A. That combination is a different bearing (overall width 21.082 mm), so check the cup number against the one in your housing before ordering.

To work out the equivalent dynamic load Pr for a single bearing: where Fa/Fr is at or below e, Pr = Fr; above e, Pr = 0.4 x Fr + Y1 x Fa. For this bearing e is 0.38 and Y1 is 1.59.

Fitting and use

A radial load on a single row tapered roller bearing creates an induced axial load, Fa' = Fr / (2 x Y1), which tries to separate the cone and cup. It is normally balanced by mounting two bearings as a pair or as a multi-row set, so work out the axial load on each bearing, not just the one that carries the thrust.

The internal clearance is set when you mount the bearing, by the axial position of the cone against the cup. The bearing can also be preloaded for higher rigidity and running accuracy, but too much preload raises heat and shortens bearing life, so follow the equipment maker’s setting.

Limiting speeds are given for grease and for oil lubrication. Check the load and speed against the figures here and apply a suitable safety factor; contact AIMS if you want a second opinion before ordering.

Related products

Metric sizes are on the NACHI metric J tapered roller bearings page and the NACHI DJ tapered roller bearings page. The other inch series size is the NACHI LM11949/10. Other NACHI bearing types: NACHI single row angular contact ball bearings, NACHI spherical roller bearings and NACHI cylindrical roller bearings.