Needle roller bearings

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A needle roller bearing is a special type of roller bearing which uses long, thin cylindrical rollers resembling needles. Ordinary roller bearings' rollers are only slightly longer than their diameter, but needle bearings typically have rollers that are at least four times longer than their diameter.Like all bearings, they are used to reduce the friction of a rotating surface.

Compared to ball bearings and ordinary roller bearings, needle bearings have a greater surface area in contact with the races, so they can support a greater load. They are also thinner, so they require less clearance between the axle and the surrounding structure.

Needle bearings are heavily used in automobile components such as rocker arm pivots, pumps, compressors, and transmissions. The drive shaft of a rear-wheel drive vehicle typically has at least eight needle bearings (four in each U joint) and often more if it is particularly long, or operates on steep slopes.

Bearing Number	Bore Dia	Outer DIa	Width	Size
NTN DCL308 needle roller bearings	6348	240x500x95	240,000	500,000
NBS K 20x26x14 needle roller bearings	3700	3782	3729D	Imperial
INA F-210308 needle roller bearings	BB1-0322	15x35x11	15	35
KOYO RP707632 needle roller bearings	6707	35x44x5	35,000	44,000
65 mm x 90 mm x 25 mm IKO NA 4913 needle roller bearings	6411	55x140x33	55	140
Timken RNA1035 needle roller bearings	6708-2RS	40x50x6	40	50
NTN K65X73X30 needle roller bearings	6806NR	30x42x7	30	42
FBJ HK0408TN needle roller bearings	636 VV	6x22x7	6	22
NSK MFJT-3022 needle roller bearings	619/800 MA	800x1060x115	800	1060
NSK FJL-1720L needle roller bearings	6328Z	140x300x62	140,000	300,000
INA SCE136 needle roller bearings	6907NR	35x55x10	35	55
IKO TR 8310845 needle roller bearings	68/950	950x1150x90	950,000	1150,000