RNA152512 Needle Roller Bearings Dimension

RNA152512 Needle Roller Bearings Dimension

  NK15/12(RNA152512) Bearing online

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 an a needle cage which orients and contains the needle rollers, the needle rollers themselves, and an outer race(sometimes 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 engine components such as rocker arm pivots, pumps, compressors, and transmissions. The drive shaft of a rear-wheel drive vehicle typically has at least 8 needle bearings (4 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.

Used in motorcycles, mopeds, automobiles, power tools, and industrial machinery

Heavy duty needle roller bearings can be found in the following applications:

· Gear pumps

· Mud pumps

· Oil field pumping jacks

· Helicopter rotors and transmissions

· Telehandlers

· Material handling equipment

· Hydraulic pumps

· Sheave Blocks

· Hoist drum shaft

· Marine crankshafts and connecting rods

· Pipe handling tables in steel mill equipment

· Paper punch presses

· Planet gears and mainshaft bearings of a clutch drive or mechanical press

· Calendar rolls in textile machinery

· Railroad tampering equipment

 Bearing Catalogue :
Drawn Cup Needle Roller Bearings
HK BK series
Sealed Drawn Cup Needle Roller Bearings
HK...RS,HR...2RS,BK...RS series
Drawn Cup Full Complement Needle Roller Bearings
F,FH,MF,MFH,FY,MFY series
Drawn Cup Roller Clutches/ Clutch And Bearing Assemblies
HF,HFL series

Radial Needle Roller and Cage Assemblies
K,K...ZW,K...D,K...ZWD series
Long Cylindrical Roller and Cage Assemblies
KNL series

Radial Needle Roller and Cage Assemblies for Pin of Connecting Rod
KZK type
KBK type

Heavy Duty Needle Roller Bearings
Heavy Duty Needle Roller Bearings Without Inner Ring
NK,NKS,RNA49,RNA69 series
Heavy Duty Needle Roller Bearings With Inner Ring
NKI,NKIS,NA49,NA48,NA69 series
Sealed Heavy Duty Needle Roller Bearing With Inner or Without Inner Ring
RNA49...RS,RNA49...2RS,NA49...RS,NA49...2RS series
Heavy Duty Needle Roller Bearings With Ribs
RNAO series
Aligning Heavy Duty Needle Roller Bearings With or Without Inner Ring
RPNA,PNA series
Heavy Duty Full Complement Needle Roller Bearings
RNAV,NAV series

Track Roller Bearings 
Yoke Type Track Rollers Without Axial Guidance
RSTO,STO series
Sealed Yoke Type Track Rollers Without Axial Guidance
RNA22...2RS,NA22...2RS series
Yoke Type Track Rollers With Axial Guidance
NUTR,NATV series
Stud Type Track Roller
KR,KRV,NUKR series

Inner Ring 
IR, LR Series

Axial Needle Roller and Cage Assemblies
Axial Needle Roller and Cage Assemblies
AXK series
Axial Needle Roller Bearing With Centring Spigot On the Bearing Washer
AXW series
Axial Cylindrical Roller and Cage Assemblies
K811,K812,K871,K894 series
Needle Bearings for Automotive

Needle roller bearing catalogue:

The pictures:

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