NACHI NJ206EGC3 NJ Cylindrical Roller Bearing 30x62x16 mm, EG high capacity, C3

This NACHI range covers 2 single row cylindrical roller bearings in NJ configuration (two flanges on the outer ring and one flange on the inner ring), with the E high-capacity design, a polyamide cage (G) and C3 radial internal clearance. The bore is 30 mm (200 and 300 series; outer diameters 62 to 72 mm, widths 16 to 19 mm). Select the size from the drop-down: each size has its own bearing number, load ratings and limiting speeds in the Model Details.

The inner ring and roller set can be separated from the outer ring. It takes axial load in one direction and locates the shaft in that direction only. Cylindrical roller bearings have line contact between rollers and raceways, which gives a high radial load capacity for the size.

Where this product is used

• Electric motors and generators
• Gearboxes and industrial transmissions
• Pumps, fans and compressors
• Machine tools and general industrial machinery
• Conveyor drives and other heavy rotating equipment

Features

• NJ configuration, with two flanges on the outer ring and one flange on the inner ring. The inner ring and roller set can be separated from the outer ring.
• Takes axial load in one direction and locates the shaft in that direction only. Axial load is carried by sliding contact between roller ends and flanges, so the allowable axial load is limited
• E high-capacity design with polyamide cage (G) on every size: higher load ratings than the standard design of the same number, with polyamide-cage bearings for operating temperatures below 120 °C
• C3 radial internal clearance, larger than Normal: 35 to 60 µm on a 30 mm bore
• Basic dynamic load rating Cr 39 to 53 kN and basic static load rating Cor 37.5 to 50 kN across the range; load ratings, speeds and dimensions for every size come from the manufacturer’s catalogue

Key specifications

Available sizes

Limiting speeds are the catalogue table values for these EG numbers (polyamide cage).

Selecting the right option

The NJ configuration has two flanges on the outer ring and one flange on the inner ring. It takes radial load plus axial load in one direction, and so locates the shaft in that direction only. Axial load is carried by sliding contact between roller ends and flanges, so the allowable axial load is limited: for heavy or continuous axial load, send AIMS the application details first.

C3 radial internal clearance is larger than Normal. The catalogue recommends C3 or larger where the inner ring runs hotter than the outer ring or the shaft deflects a lot. Interference fits also reduce the working clearance, so check it for your fits and operating temperatures. With axial load the catalogue advises keeping radial clearance small, so choose C3 only where temperature difference, fits or shaft deflection call for it.

Both 200 and 300 series bearings are listed. For the same bore the 300 series has a larger outer diameter and width and a higher load rating than the 200 series, so choose on the housing space you have and the load to be carried.

The EG versions have higher load ratings than the standard design of the same number, with the same bore, outer diameter and width. Check the polyamide cage temperature limit (below 120 °C) for your application.

Fitting and use

Check the load and speed against the catalogue figures before ordering and apply a suitable safety factor. Cylindrical roller bearings are mainly for radial load: any axial load must be well within what the flanges can carry by sliding contact, and the limit depends on lubrication and speed as well as the bearing.

The cage is polyamide (G), which is for operating temperatures below 120 °C. The limiting speeds in the table are the catalogue figures for these EG numbers.

Where axial load is applied, keep enough radial load on the bearing, supply plenty of lubricant between the roller ends and flanges, use a lubricant with good film strength, mount the bearing accurately, allow a running-in period and keep the radial clearance small.

These bearings are open: the housing arrangement has to supply and hold the lubricant and keep contamination out. Fit the rings with the housing and shaft tolerances recommended for your application, and keep the shaft and housing seats clean and square.

If you are replacing a bearing, check the full number stamped on it, including any letters after the digits, and send AIMS the number or the dimensions if you are not sure.

Related products

More sizes in the same configuration: NACHI NJ cylindrical roller bearings (19 sizes) and NACHI NJ C3 cylindrical roller bearings (12 sizes). Other configurations: NACHI NU C3 cylindrical roller bearings (15 sizes) and NACHI N C3 cylindrical roller bearings (8 sizes). For combined radial and axial loads on one bearing, see the NACHI tapered roller bearings (metric series).