Bore Measurement: 1 – 10 mm
Applicable Industries: Building Material Stores, Manufacturing Plant, Machinery Restore Shops, Food & Beverage Factory, Farms, Retail, Construction works , Strength & Mining, Marketing Firm
Kind: Needle
Product Variety: NA4903 NA4904
Precision Score: P0 P6 P5 P4 P2
Seals Variety: Open up
Quantity of Row: One row
Substance: Chrome Metal
Software: Bicycles
Attribute: Extended Daily life
Certificate: ISO9001:2008
Lubrication: Oil
bodyweight: .018kg
Shipping and delivery Time: 4-9 Doing work Days
Support: OEM Custom-made Solutions
measurement: forty*forty seven*30 mm
Packaging Particulars: 1. Normal export bundle (from inside to outdoors): oiled paper, packing containers, cartons, (and picket pallets) 2.Customized packing
Port: Shen zhen

Needle roller bearing is a bearing unit composed of machined outer ring & interior ring,cage and
needle roller assembly featuring tiny part top,big load capacity & rigidity,compact
construction and modest size,substantial rotating accuracy with the framework of disposed internal ring.
Needle roller bearing is characterized by multiple buildings,broad adaptability and straightforward
set up.
It is extensively utilized in car,device toll, 6816 deep groove ball bearing 61816 lead bridge bearings CZPT provider lathe,metallurgical,textile,printing sector and
etc. Different machinery products. With this type of bearing,machine design can understand the
purpose of modest-scale & gentle bodyweight.
Sorts of Patterns:
This type of bearing has several structural designs for the option of consumers,this sort of as
narrow & broad sequence,with or with no interior rings,cages,rib or sealings. It can be designed
in accordance to the special structural demands of consumers as nicely.
Merchandise Precision Accuracy:
Dimensional tolerance and geometrical accuracy is based mostly on GB/T5801.
Mutual distinction of needle roller diameter is 2 um,and the precision grade is class
G2(ISO GB/T309)
The diameter of inscribed circle conforms to tolerance quality F6 just before the fitting of outer
ring with cage and roller assembly
Bearing radial operating clearance conforms to the price described by course group of GB/T4604
Specific precision grade in based on GB/T307.1
For fuller information on the particular prerequisite of bearing working clearance, inscribed circle
and precision quality,please make contact with our business
Materials for needle roller is GCr15 bearing metal,quench-hardening HRC60-65
Substance for internal and outer rings is GCr15 bearing metal,quench-hardening HRC60-65
Materials for cages is top quality reduced-carbon metal or reinforced nylon.

Packaging & Shipping and delivery
SAMPLE Accessible
Cargo: Logistics forwarder or Categorical provider, in accordance to amount
Supply time: 3-fifteen times according to quantity required
High quality: Export normal
Price tag phrase: FOB

Our Companies
one.substantial precison high pace lower friction
2.factory price
3.quick supply time (HangZhou port or ZheJiang port)
four.huge stock is obtainable
five.we can offer you sample
6.numerous manufacturers can pick and oem service
7.numerous payment terms(L/C,T/T,West Union, Kelly KLS7215N 30V-72V 160A Sinusoidal Brushless motor controller for 1500W Electrical Motorbike E-scooter MoneyGram,Paypal)
8.we will find the perfect transportation methods for you
Company Info
HangZhou ZYSL bearing Co., Ltd.are company and supplier from HangZhou ZheJiang China , Which is on the line of bearing for much more than twenty several years experience .We combine R&D,creation and export of bearings.

So 1 of our most significant advantage compared others is that we can supply the greatest manufacturing facility price tag dependent on the exact same good top quality.Our personnel are all gained specialist instruction.

And until now we has set up a professional product sales community to support consumers get merchandise information at the 1st time.Aside from our business has powerful specialized energy, outstanding processing tools and total tests gear to make certain top quality of bearings.The yearly generation capacity is a lot more than 960 million units.Top quality is our culture and believability is our principal principle in our business. So we consistently attempt for analysis and innovation development, adhere to the principle of “survival of higher quality”, and give outstanding provider for customers.

1. How extended is your supply term?
Our regular item supply phrase is usually thirty days. A new merchandise advancement cycle is sixty times in standard. Below regular situation, there are standing stock for regular types. You can e mail us to discover much more specifics.
2. Where is your port of cargo situated?Our primary port of shipment is HangZhou port, and we could function at other ports if essential by the consumer.
3. I couldn’t discover a style to fit my application in your catalog. Can you aid me layout a bearing?Indeed, specialized skills is offered to help you with engineering style for custom made items. Offered alternatives contain, but are not minimal to, custom rings, retainers, balls, shields, Scorching offering brand 21304 21305 21306 21307 21308 21309 21310 21311 21312 ca cck33 c3 spherical roller bearing lubricants, and packaging. We look ahead to operating with you to fulfill your rotary motion demands.

Get in touch with
I am seeking ahead to receiving your enquires quickly .^ – ^

The Benefits of Using Self-Lubricating Bushings for Your Next Pivot

Like any other auto part, control arm bushings wear out over time. This results in an increase in irritating vibrations that can be dangerous in severe cases. The bushings in the control arms also wear out due to the stress that extreme driving conditions put on the control arms. Additionally, environmental factors and oversized tires tend to transmit more vibration through the bushing than conventionally sized tires. Whatever the cause, bushings can be the source of many problems.

wear and cracking

The main cause of dry valve side bushing cracking is a mismatch in thermal expansion of the core and flange. This situation can seriously compromise the safety of the power system. To improve the safety of dry valve side bushings, the crack development of epoxy impregnated paper under various conditions was investigated. A coupled thermomechanical simulation model was also used to study the cracking process.
The first step in diagnosing the cause of bushing wear and cracking is a visual inspection. The bushing of the lower control arm is fixed to the frame by a bracket. If there are any visible cracks, it’s time to replace the bushing. However, there is no need to replace the entire suspension. In some cases, worn bushings can cause a variety of problems, including body lean, excessive tire wear and cornering noise.

Maintenance free

If you’re considering maintenance-free bushings for your next pivot, you’ll be wondering what to look for in these components. The bushing protects the housing from corrosion and keeps the bushing under pressure. However, many users are not familiar with what these components can do for their applications. In this article, we’ll look at several examples of truly maintenance-free pivots and discuss their requirements.
One of the most popular types of maintenance-free bushings are flanged and parallel. Unlike worm gear bushings, these self-lubricating metal bearings are ideal for a variety of applications and conditions. They reduce failure and downtime costs while providing the long-term lubrication required by other types of bushings. Since these sleeves are made of lead-free material, they are RoHS compliant, which means they are environmentally friendly.Another common maintenance-free bushing is plastic. This material is easier to find off-the-shelf and relatively inexpensive to produce. However, it is not suitable for high load applications as it will crack under heavy loads and damage mating parts. Plastics can also deviate if the manufacturing process is imprecise. Plastic bushings can also crack when subjected to high loads.


When using a self-lubricating bushing, there is no need to apply grease to the bushing. Oily liquids tend to attract dirt and grit, which can wear away the graphite prematurely. By eliminating the need for regular lubrication, you will reduce equipment maintenance costs. This article will explore the benefits of self-lubricating bushings. You will love your kindness.
Self-lubricating bushings have a strong base material to withstand radial bearing pressure while providing shaft support at the contact surfaces. The material also has good fatigue properties and low friction motion. Self-lubricating bushings can be used in environments with high temperatures and aggressive media. These products can also withstand enormous pressure. When using self-lubricating bushings, it is important to select the correct material.
The main advantage of using self-lubricating bushings is ease of maintenance. They don’t require oil to run and are cheaper to buy. Their main benefit is that they can significantly reduce your machine running costs. These bearings do not require oiling operations, reducing maintenance costs. These bearings also offer a simplified mechanical design due to their thin walls and high load capacity. In addition, they reduce noise levels while maintaining excellent wear resistance. Plus, their materials are ROHS compliant, which means they don’t require oil.
Hydropower installations are another area where self-lubricating bushings have proven their advantages. They reduce maintenance costs, extend equipment life, and improve environmental benefits. For example, the Newfoundland Power Company uses self-lubricating bushings in the gates of its hydroelectric power plants. These self-lubricating bushings eliminate grease from entering waterways and tailraces. As a result, power companies are able to reduce maintenance and costs.

compared to cartilage in the human body

What is the difference between tendon, bone and cartilage? Human cartilage is composed of collagen and elastic fibers. In contrast, fibrocartilage contains more collagen than hyaline cartilage. Both cartilage types are composed of proteoglycans, which have a protein backbone and glycosaminoglycan side chains. These components work together to provide structure and flexibility to the cartilage.
Bone is a combination of living and dead cells embedded in a matrix. The outer hard layer of bone is dense bone, and the inner layer is spongy, containing bone marrow, blood vessels, nerves, etc. Bone contains both organic and inorganic substances, and this process of hardening of the matrix produces bone. On the other hand, cartilage consists of chondrocytes and a matrix composed of collagen and elastin fibers. Compared to bone, cartilage is yellow and contains elastic fibers.
Although bone and cartilage are structurally identical, cartilage is more flexible. It is mainly found in the joints and respiratory system and requires flexibility. Its ingredients include collagen and proteoglycans, which provide compression and abrasion resistance. Furthermore, connective tissue is composed of cells, fibers and matrix.
The basic substance of cartilage is chondroitin sulfate, which is derived from animals. Although cartilage grows more slowly than bone, its microstructure is less organized. There is a fibrous sheath covering the cartilage, called the perichondrium. The molecular composition of the ECM plays an important role in the function of cartilage. The collagen matrix is ​​important for cartilage remodeling and consists of changes in the collagen matrix.

Compared to metal-on-bone contact

Both metal-on-bone contact are known to cause a significant increase in the pressures in a joint. To compare the two, we first calculated the joint contact pressures in each model and compared them. The results of this study support previous research on this subject. The following sections discuss the benefits of both types of contact. They also outline some key differences between the two.

China Radial bearing needle roller manufacturers NA4903 NA4904 NAV NAO RNA series bearing for riveting machinery     wheel bearingChina Radial bearing needle roller manufacturers NA4903 NA4904 NAV NAO RNA series bearing for riveting machinery     wheel bearing
editor by czh 2023-02-20