micro roller bearings dental handpiece bearing

micro roller bearings
Introduction of Needle Bearing
A needle roller bearing is a bearing which uses small cylindrical rollers.
They are used to reduce friction of a rotating surface.
Needle bearings have a large surface area that is in contact with the bearing outer surfaces compared to ball bearings. Additionally there is less added clearance (difference between the diameter of the shaft and the diameter of the bearing) so they are much more compact.
The typical structure consists of a needle cage which orients and contains the needle rollers, the needle rollers themselves, and an outer race (sometimes the housing itself).
Radial needle bearings are cylindrical and use rollers parallel to the axis of the shaft. Thrust needle bearings are flat and use a radial pattern of needles.
Full complement bearings have solid inner and outer rings and rib-guided cylindrical rollers. Since these bearings have the largest possible number of rolling elements, they have extremely high radial load carrying capacity and are suitable for particularly compact designs.
Application

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.
Additional clarification of needle roller: According to "Marks' Standard Handbook for Mechanical Engineers", a needle bearing is a roller bearing with rollers whose length are at least four times their diameter.

Full Models of Standard Needle Roller bearing
Item No.
Model No.
Specification ranges
1
BK
BK0408~BK6032 4~60
2
HK
HK0408~HK6032 4~60
3
BA
BA55~BA1816 7.94~22.22
4
SCE
SCE108~SCE1616PP 15.88~25.4
5
F
F-0608~F-60*68*40 6~60
6
HF
HF0409~HF3530 4~35
7
HF plus
HF HFL RC RCB FC FCB
8
K
K5*8*8TN~K110*118*30 5~110
9
KZK
KZK8*12*8~KZK40*48*20 8~40
10
KBK
KBK8*11*10~KBK20*25*25 8~20
11
NK
NK5/10TN~NK60/25 5~60
12
RNA
RNA4900~RNA4928 14~160
13
RNA
RNA6900~RNA6919 14~110
14
NKI
NKI8~NKI100/30 8~100
15
NA
NA4900~NA4928 10~140
16
NA
NA6900~NA6919 10~95
17
RNAV
RNAV4002~RNAV4017 21.87~104.8
18
NAV
NAV4002~NAV4017 15~85
19
AXK
AXK0414TN~AXK160200 4~160
20
NTA
NTA-512~NTA-3244 7.92~50.80
21
AXW
AXW10~AXW50 10~50
22
AS
AS0414~AS160200 4~160
23
WS
WS81102~WS81132 15~160
24
ZS
ZS1127~ZS141199 15~160..Non-Standard Needle Roller bearing
1) As for the particularity of the non-standard bearing,this product series can not be list.
2) You can send your demand or blueprint to us, our experts will design non-standard bearing for you.
3) Products can also be produced according to the samples.Spare Parts of Needle Roller bearing
Rollers and Pinsabout us
We are a professional manufacturer and exporting supplier on various kinds machinery parts for over 14 years already.Our products covering slide bearings, needle roller bearings,ball transfer bearings and other machienry hardware fittings.
1) Outer cage grinding line
2) Rollers grinding automatic line
3) Ultrasonice cleaning before assembly
4) Packing: cartons and plywooden case
5) Different delivery waysWe also supply various kinds of slide bearings: