2011 Large Stock High Quality Needle Roller Bearings

2011 Large Stock Needle Roller Bearings 1) High quality control 2) competitive price 3) Small order accepte 4) Low noise

2011 Large Stock High Quality Needle Roller Bearings eries 

New	Old	d(mm)	D (mm)	B (mm)	Cr(kN)	Cor(kN)	Grease Speed limiting (r/min)	Oil speed limiting (r/min)	Weight (kg)
NQI50/25	-	50	68	25	47.4	90.4	8500	-	0.255
NQIS45/22	-	45	72	22	44.6	71.6	8300	-	0.341
NA4910R	-	50	72	22	48.0	80.0	7900	-	0.276
NA5910	-	50	72	30	61.6	110	7900	-	0.375
NA4911R	-	55	80	25	58.4	99.0	7300	-	0.401
NA5911	-	55	80	34	75.6	138	7300	-	0.546
NA4912R	-	60	85	25	61.2	108	6800	-	0.431
NA5912	-	60	85	34	79.2	150	6800	-	0.587
NA5913	-	65	90	34	85.4	158	6400	-	0.613
NA5914	-	70	100	40	107	207	5700	-	0.973
NA5915	-	75	105	40	109	216	5400	-	1.03
NA5916	-	80	110	40	114	232	5100	-	1.09
NA5917	-	85	120	46	126	293	4700	-	1.65
NA5918	-	90	125	46	137	311	4400	-	1.70
NA5919	-	95	130	46	141	331	4200	-	1.78

Needle bearings are roller bearings with rollers that have high length-to diameter ratios. Needle bearings are used in farm and construction equipment, automotive transmissions, small gasoline engines, gear pumps, small appliance and tool motors, alternators, and aircraft controls.

Needle bearings are usually lubricated with grease, but oil or oil-mist lubrication is preferred for heavy-duty or high-speed applications. Many light-duty needle bearings never require relubrication, but high loads or speeds demand it.

   

 Needle bearings have the highest load capacity for a given radial space of all rolling-element bearings, but their use is limited to bore diameters less than 10 in.

 All needle bearings are variations of two basic designs. The first needle bearing design, full complement, has a full complement of needles and contains no retainer. The second needle bearing design, caged needle, contains a retainer or cage for roller guidance and spacing. Caged needle bearings have smaller roller complements and lower load capacities than full-complement bearings. Needle bearings have the advantage of a higher speed capacity; retainers prevent high-velocity rubbing between adjacent needles and provide more effective roller guidance. Needle bearings also have greater lubricant capacity.

2011 Large Stock High Quality Needle Roller Bearings