Product Details
Place of Origin: China
Brand Name: SFT
Model Number: K30*40*30
Payment & Shipping Terms
Minimum Order Quantity: negotiable
Price: negotiable
Packaging Details: carton,pallet
Delivery Time: 20-45DAYS
Payment Terms: L/C, T/T, Western Union, MoneyGram
Supply Ability: 50000PCS/MONTH
Lubrication: |
Grease Lubrication |
Bore Size: |
1 - 16 Mm |
Type: |
Needle |
Number Of Row: |
Single Row Or Double Row |
Cage: |
Steel |
Seals Type: |
Open Or Sealed |
Lubrication: |
Grease Lubrication |
Bore Size: |
1 - 16 Mm |
Type: |
Needle |
Number Of Row: |
Single Row Or Double Row |
Cage: |
Steel |
Seals Type: |
Open Or Sealed |
K304030 Bearing size 30*40*30 mm Radial Needle Roller and Cage Assemblies K30*40*30 Bearings
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.
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.
Needle roller bearing K series:
| Model No(d*D*Bmm) | Model No(d*D*Bmm) |
| K30×35×17 | K20×24×10 |
| K30×37×17 | K20×24×13 |
| K30×40×30 | K28*40*25 |
| K32×38×20 | K20×26×12 |
| K35×40×17 | K20×26×20 |
| K40×45×13 | K20×28×20 |
| K40×45×27 | K22×26×17 |
| K40×47×20 | K24×28×10 |
| K45×53×20 | K24×28×13 |
| K50×55×20 | K24×30×17 |
| K50×58×20 | K25×29×17 |
| K50×58×25 | K25×30×17 |
| K60×65×30 | K25×32×16 |
| K60×68×20 | K25×33×24 |
| K65×70×20 | K25×35×30 |
| K65×70×30 | K28×33×13 |
| K70×78×20 | K28×33×17 |
| K70×78×30 | K28×33×27 |
| K75×81×20 | K08×11×10 |
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