Bearings Name	New Model	Old Model:	ID(mm)	OD(mm)	Width(mm)	Cr(kN)	Cor(kN)	Grease Lubrication Speed(r/min)	Oil Lubrication Speed(r/min)	Weight(kg)
NA6903 Needle Roller Bearings	NA6903	6544903	17	30	23	18.9	29.0	20000	-	0.067
RNA6903 Needle Roller Bearings	RNA6903	6644903	17	30	23	18.9	29.0	20000	-	0.040
RNA6903X2A Single or double row needle roller bearings	RNA6903X2A	634704	22	30	30	-	-	-	-	0.059
RNA6903A Needle Roller Bearings	RNA6903A	6634903	22	30	23	-	-	-	-	0.042
NA6903A/p6 bearings SKF,NSK,NTN,FAG,NACHI,KOYO	NA6903A/P6	E6534903	17	30	23	-	-	-	-	0.072

This 6903-2RS 17x30x7-millimeter sealed ball bearing has deep groove geometry for high speeds and supporting both radial and axial loads. Its chrome steel construction makes it durable and resistant to deformity under heavy loads. The rubber seals on both sides of the bearing keep lubricant in and contaminants out, and it comes pre-lubricated from the manufacturer so that no additional lubrication is required. The chrome steel cage evenly spaces the balls for even load distribution and prevents contact to reduce friction, vibrations, and noise. This deep-groove sealed ball bearing is for use in applications that involve combined radial and axial loads and a need for high running accuracy at high rotational speeds. Such applications include clutches, drives, gearboxes, compressors, pumps, turbines, and printing and textile machines, among others.

Model Numbers: B6903, 6903, 6903Z, B6903ZZ, 6903ZZ, B6903DDU, 6903DDU, 6903LLU, 6903-2NSE, 6903H2RS
Bearing Sizing: ID 17mm X OD 30mm X W 7mm, 17 mm Ball Bearing
Bearing Seals: Open, Single Shielded, Double Shielded, Rubber Sealed
Type: Deep Groove Ball Bearing
Cage: Chrome Steel
Material: Chrome Steel