needle roller bearings

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
NSK J-188 needle roller bearings	6801ZZ	12x21x5	12	21
Timken B-77 needle roller bearings	6909ZENR	45x68x12	45	68
NTN HK3520 needle roller bearings	4T-46790/46720	165.1x225.425x41.275	165,1	225,425
FBJ K90X98X26 needle roller bearings	2-3/16 in	Felt Type	Split Cylindrical Expansion Type	Two-Bolt Plummer Block
55 mm x 72 mm x 25 mm JNS NKI 55/25 needle roller bearings	63/32-2RS NR C3	32x75x20	32	75
KOYO MK28121 needle roller bearings	672	2x4x1.2	2	4
NSK B-2816 needle roller bearings	TUP1 35.25	35	39	35 mm
NBS KBK 15x19x20 needle roller bearings	6811ZZ	55x72x9	55	72
NSK FNTA-3552 needle roller bearings	6301ZZ	12x37x12	12	37
NBS NA 6917 ZW needle roller bearings	6805-2NSE	25x37x7	25	37