Stainless Roller Bearings
Overview
Stainless Roller Bearings are made from high-carbon, high-chromium martensitic stainless steel 440C, offering high hardness, excellent wear resistance, and corrosion resistance. Suitable for high-temperature, dry, or corrosive environments, they are widely used in demanding applications such as aerospace, medical equipment, and food processing. While their dynamic load capacity is relatively low, they offer excellent dimensional stability and rust resistance, making them a high-performance specialty bearing.
Stainless Steel Characteristics
Excellent corrosion resistance
440C stainless steel contains 16%-18% chromium and a small amount of molybdenum (0.75%), which can form a dense chromium oxide film on the surface of the material, effectively isolating it from corrosion by water, oxygen, and mild chemical media, and is far superior to ordinary high-carbon chromium-bearing steel.
High mechanical strength
The tensile strength (approximately 1900MPa) and yield strength (approximately 1700MPa) of 440C are significantly higher than those of austenitic stainless steel. It has better impact resistance, ensures the operating accuracy of the bearing, and reduces premature failure caused by excessive load.
Good high temperature stability
It can still maintain a certain hardness and mechanical properties at high temperatures, and its continuous use temperature can reach 250°C, avoiding softening of the material or loss of precision due to high temperature.
Excellent wear resistance
The hardness can reach HRC 58-62, which can withstand friction loss under low to medium speed conditions, reduce the wear of the rolling elements and inner and outer rings inside the bearing, and extend the service life.
Stainless Roller Bearings Dimension
| Grade | 440C |
| Ingredient Combination |
C:0.95-1.20% Cr:16-18% Mo:0.75% |
|
Size |
ID:1.5-100mm OD:5-150mm Width:2-40mm |
| Hardness | HRC 58-62 |
| Standard | ASTM A276,GB/T 1220 |
| Certification | ISO 9001 |
Application
1. Aerospace and Defense Industry
Stainless Roller Bearings offer excellent high-temperature dimensional stability and maintain precision even in environments with large temperature fluctuations. It is suitable for applications in high-altitude, vacuum, or high-temperature environments, such as aircraft engine accessories, navigation systems, satellite mechanisms, and missile servos.
2. Food and Beverage Processing Industry
Stainless Steel Bearing is resistant to water washing, steam cleaning, and weak acid and alkaline cleaning agents, making it suitable for bearings in food slicers, filling equipment, mixing devices, and conveying systems. It can operate in humid, highly oxidizing environments without seizure.
3. Chemical and Petrochemical Industry
Stainless Steel 440C Bearing can be used in pump shafts, valves, reactor agitator bearings, and corrosive media conveying equipment. It can operate in highly oxidizing atmospheres without lubrication, preventing leaks or downtime caused by bearing corrosion.
4. Medical Device Industry
It is used in medical equipment such as surgical instrument spindles, dental drills, and endoscope drive components. It can withstand high-temperature and high-pressure sterilization, maintains precision after long-term use, and meets biocompatibility requirements.
5. Precision Instruments and Optical Equipment
Used in high-precision measuring instruments, microscope focusing mechanisms, and rotating components in laser cutting heads.
- Excellent dimensional stability, suitable for micron-level positioning requirements.
- Low magnetic properties are suitable for equipment that is sensitive to magnetic fields.
Process
① Select standard 440C stainless steel round bar and test its composition and metallographic structure (to avoid excessive impurities) to prevent cracking during subsequent processing.
② Hot forge the annealed 440C round bar (heating to 1050-1150°C) to produce the inner and outer ring blanks and the rolling element spherical blanks.
③ Rough and finish turn the forged blanks using a CNC lathe to create the inner bore of the inner ring, the outer diameter of the outer ring, and the spherical surface of the rolling element. Oil holes, sealing grooves, and other structures are also machined.
④ Quench and low-temperature temper the turned rings and rolling elements to stabilize the martensitic structure and improve corrosion resistance.
⑤ Grind the heat-treated components using a high-precision grinder, maintaining micron-level tolerances for the inner and outer diameters, as well as the rolling element diameters.
⑥ Remove residual grinding debris and oil residue using a neutral detergent, then perform a passivation treatment to prevent rust during storage and transportation.
⑦ Assemble in the order of "outer ring → cage → rolling element → inner ring." Install seals and grease, and finally press-fit the dust cover.
⑧ Test the bearing for rotational flexibility, radial clearance, dimensional accuracy, and sealing performance (including water and dust resistance testing). Only qualified bearings can be shipped to customers.
Pictures
Why choose us
One-Stop Solution
After receiving the customer's inquiry, we will respond immediately to confirm the customer's needs, such as size specifications and order quantity, and then carry out a series of services such as quotation, customized production, quality inspection, packaging and delivery, after-sales, etc. It is our responsibility to let customers have no worries.
01
Advanced production equipment
We have professional CNC machine tools, rolling machines, sintering furnaces, cutting machines, welding equipment, and surface treatment equipment. Moreover, our technicians can design drawings and customize production according to customer requirements. They can also go to overseas customers to carry out on-site installation of equipment.
02
High-Quality After-Sales
If customers encounter any quality issues after receiving the product, or if any items are missing during transit, we will promptly reach out to them and offer a satisfactory resolution. Upon notification of any problem, our team initiates a thorough investigation to identify the root cause and prevent future occurrences. We believe in transparency and will keep our customers informed throughout the resolution process.
03
Global Shipping
We have established long-term cooperation with many international logistics companies, such as DHL, UPS, FedEx, and SF Express, and can deliver products to customers on time by land or air transportation. We can effectively avoid trade barriers, shorten the delivery cycle, ensure the safety and on-time arrival of goods, and significantly reduce operating costs and improve customer satisfaction.
04
Case
Stainless Roller Bearings, Stainless Steel 440C Bearing To Romania
Recently, FANMETAL, a domestic non-ferrous metal export supplier, completed the production and customs clearance procedures for a batch of high-specification 440C bearings. These were successfully dispatched via international air freight to an industrial equipment manufacturer in Romania. Upon receiving the client's order, we promptly assembled a dedicated team of three senior engineers. Based on the load and rotational speed parameters of the client's various equipment models, we optimized the bearing cage structure and seal design to achieve perfect compatibility with their machinery. Furthermore, we committed to providing solutions within four hours of any post-sales queries raised by the client. During the shipping phase, we also assisted with customs clearance to ensure timely delivery and smooth receipt of the products.
Product qualification
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