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
KOYO 40BM4716 needle roller bearings	UCPG210	50	50 mm	19 mm
NTN HK5022L needle roller bearings	NA6914	70x100x54	70	100
IKO RNA 6916U needle roller bearings	6814ZZ	70x90x10	70	90
20 mm x 37 mm x 17 mm KOYO NA4904 needle roller bearings	3202-B-TV	15x35x15.9	15	35
NTN H25X32X15.80 needle roller bearings	F61801-2Z	12x21x5	12	21
ZEN HK3520 needle roller bearings	6800VV	10x19x5	10	19
NBS K 30x38x25 needle roller bearings	NNCL4920 V	100x140x40	100	140
Timken K30X35X17H needle roller bearings	NJ29/1000	1000x1320x185	1000	1320
ZEN HK5528 needle roller bearings	6800-2RS C3	10x19x5	10	19
NBS KBK 15x19x19 needle roller bearings	6344	220x460x88	220	460
INA KZK 40x48x20 needle roller bearings	6800Z	10x19x5	10	19
JNS RNAF557220 needle roller bearings	NJ2324E	120x260x86	120	260