Nk28/30 Heavy-Duty Needle Roller Bearing with Machined Outer Ring and Cage

• Customization: Available
• Cage: Without Cage
• Rows Number: Multiple
• Model NO.: NK28/30
• Load Direction: Radial Bearing
• Style: Without Outer Ring
• Material: Bearing Steel
• Type: Closed
• Series: Nk
• Load Capacity: Handles High Radial Loads and Dynamic Conditions
• Sealing: Available with Sealed Designs for Contaminant
• Standard Cage Type: Steel or Full Complement
• Lubrication Method: Grease or Oil
• Transport Package: Sealed in Plastic Bags, Packed in Foam-Lined Boxes
• Specification: Gcr15
• Trademark: LOWIFAR
• Origin: China
• HS Code: 848210
• Production Capacity: 50000PCS/Year
• Package Size: 10.00cm * 2.00cm * 10.00cm
• Package Gross Weight: 0.020kg

Product Description

Key Features of NK Series Needle Bearings for Compact, High Load Applications

(Custom configurations available upon request.)

High Load Capacity in a Compact Design
The NK28/30 features a machined solid outer ring and a steel cage-guided needle roller set, offering excellent radial load capacity while maintaining a small cross-section.
Cage-Guided Needle Rollers
Optimized for high-speed and high-precision applications, the steel cage ensures roller stability, low friction, and precise roller alignment.
No Inner Ring Design
Designed for use where the shaft can serve as the raceway. The shaft must be hardened (≥58 HRC) and ground to proper tolerance and surface finish.
Machined Raceway for Durability
Outer ring is heat-treated and precision-ground, ensuring extended service life and resistance to shock and dynamic loads.
Lubrication Friendly
Can be operated with grease or oil. Optional versions with lubrication holes or grooves available upon request.

Shaft Diameter mm	Bearing Designation	Mass g	Dimensions(mm)			Basic load ratings
			Fw	D	C	min	dyn C N		stat Cor N
5	NK5/10-TV	3.1	5	10	10	0.15	2650		1920
5	NK5/12-TV	3.7	5	10	12	0.15	3400		2.650
6	NK6/10-TV	4.7	6	12	10	0.15	2950		2280
6	NK6/12-TV	5.7	6	12	12	0.15	3800		3150
7	NK7/10-TV	6.9	7	14	10	0.3	3250		2.650
7	NK7-/12Ty	8.2	7	14	12	0.3	4150		3600
8	NK8/12-TV	8.7	8	15	12	0.3	4450		4100
8	NK8/16-TV	12	8	15	16	0.3	5800		5800
9	NK9/12-TV	10.3	9	16	12	0.3	5100		5.000
9	NK9/16-TV	12.8	9	16	16	0.3	6600		7100
10	NK10/12-TV	10.1	10	17	12	0.3	5300		5.500
10	NK10/16-TV	13.3	10	17	16	0.3	7000		7800
12	NK12/12	12.1	12	19	12	0.3	7200		7100
12	NK12/16	15.9	12	19	16	0.3	10100		11000
14	NK14/16	20.7	14	22	16	0.3	11400		11500
14	NK14/20	25.5	14	22	20	0.3	14500		15600
14	RNA4900	16.5	14	22	13	0.3	9600		9200
15	NK15/16	21.8	15	23	16	0.3	12100		12700
15	NK15/250	26.6	15	23	20	0.3	15400		17200
16	NK16/16	22.4	16	24	16	0.3	12800		13900
16	NK16/20	28.4	16	24	20	0.3	16300		18800
16	RNA4901	17.4	16	24	13	0.3	10600		10900
16	RNA69014	31	16	24	22	0.3	18100		21600
17	NK17/16	23.7	17	25	16	0.3	13500		15000
17	NK17/20	29.8	17	25	20	0.3	17100		20400
18	NK18/16	24.9	18	26	16	0.3	14100		16200
18	NK18/20	31.4	18	26	20	0.3	17900		22000
19	NK19/16	26.1	19	27	16	0.3	14700		17400
19	NK19/20	32.2	19	27	20	0.3	18700		13600
95	NA4919	1371	95	110	130	35	1.1	1	131000
95	NA6919-ZW	2500	95	110	130	63	1.1	1	197000

Shaft Diameter mm	Bearing Designation	Mass g	Dimensions (mm)				Basicload ratings
			Fw	D	C	min.	dyn C N		stat Cor N
20	NK20/16	27	20	28	16	0.3	14600		17500
20	NK20/20	33.9	20	28	20	0.3	18600		23800
20	RNA4902	21.7	20	28	13	0.3	12000		13600
20	RNA6902	39.7	20	28	23	0.3	19500		25500
20	NKS20	48.7	20	32	20	0.6	26000		25000
21	NK21/16	28.1	21	29	16	0.3	15200		18700
21	NK21/20	35.2	21	29	20	0.3	19300		25500
22	NK22/16	30	22	30	16	0.3	15800		19900
22	NK22/20	37	22	30	20	0.3	20000		27000
22	RNA4903	22.2	22	30	13	0.3	12400		14600
22	RNA6903	42.4	22	30	23	0.3	21100		29000
22	NKS22	61.5	22	35	20	0.6	27500		28000
24	NK24/16	31.9	24	32	16	0.3	16900		22300
24	NK24/20	40	24	32	20	0.3	21400		30500
24	NKS24	65.5	24	37	20	0.6	29500		31000
25	NK25/16	32.6	25	33	16	0.3	16800		22400
25	NK25/20	42	25	33	20	0.3	21300		30500
25	RNA4904	52.3	25	37	17	0.3	23700		25500
25	RNA6904	100	25	37	30	0.3	40500		51000
25	NKS25	68.1	25	38	20	0.6	31000		33500
26	NK26/16	34	26	34	16	0.3	17300		23600
26	NK26/20	42	26	34	20	0.3	22000		32000
28	NK28/20	52.2	28	37	20	0.3	24800		34000
28	NK28/30	82	28	37	30	0.3	37000		57000
28	RNA49/22	50.2	28	39	17	0.3	26000		29500
28	RNA69/22	98	28	39	30	0.3	42000		55000
28	NKS28	83.6	28	42	20	0.6	32500		36500
29	NK29/20	50	29	38	20	0.3	27500		39000
29	NK29/30	84.3	29	38	30	0.3	37000		57000
30	NK30/20	61	30	40	20	0.3	28000		41000
30	NK30/30	92.4	30	40	30	0.3	42000		69000
30	RNA4905	61	30	42	17	0.3	26500		31500
30	RNA6905	112	30	42	30	0.3	44000		59000
30	NKS30	104	30	45	22	0.6	36500		40000

High-Precision Ceramic and Stainless Steel Bearings Manufacturer

Delivering exceptional quality and precision, our ceramic and stainless steel bearings are engineered to meet the diverse needs of industries worldwide. Trusted for durability and performance, we are your reliable partner in advanced bearing solutions.

Specification

Applications
Aerospace: High-performance bearings for aircraft engines and systems.
Automotive: Durable solutions for engines, transmissions, and electric vehicles.
Medical Equipment: Precision bearings for surgical tools and diagnostic devices.
Industrial Machinery: Robust bearings for heavy-duty operations in manufacturing and production.
Renewable Energy: Specialized bearings for wind turbines and solar tracking systems.
Food & Beverage: Corrosion-resistant bearings for hygienic and reliable operations.
 
Key Configurations
Ceramic Bearings: Offering high temperature resistance, low friction, and excellent corrosion resistance.
Custom Designs: Tailored bearing solutions to meet specific application requirements.
High-Precision Tolerances: Ensuring consistent performance in demanding applications.
Maintenance-Free Options: Sealed bearings for enhanced durability and reduced downtime.

Production Process

1) Premium-grade ceramic and stainless steel materials are sourced to meet stringent quality standards.
2) Advanced CNC and grinding machines shape the bearing components to achieve tight tolerances and smooth finishes.
3) Precision polishing ensures low friction and optimal performance for both ceramic and stainless steel bearings.
4)Bearings are carefully assembled in a clean, controlled environment to maintain integrity and precision.
5) Rigorous quality checks, including dimensional accuracy, surface finish, and load testing, are performed to ensure every bearing meets or exceeds industry standards.

Ceramic bearing

Stainless steel bearing

Hybrid ceramic bearing

Many years of experience in bearing business

After Sales Service

Technical Support: Expert guidance for installation, maintenance, and troubleshooting to ensure optimal performance.
Warranty Assurance: Coverage for manufacturing defects, providing peace of mind with every purchase.
Customized Solutions: Tailored advice and modifications to address specific operational challenges or requirements.
Prompt Response: Dedicated support team available to address inquiries and resolve issues quickly and effectively.

Company Profile

At LOWIFAR Bearings, we specialize in designing and manufacturing a wide range of precision, high-quality ball bearings and tapered roller bearings. Our products are designed to meet the demands of heavy agricultural machinery, textile machinery, various engineering applications, motors, automobiles, computers, electric appliances, power tools, pumps, and more.

With over ten years of experience in bearing production, LOWIFAR is a trusted manufacturer dedicated to providing custom-made bearing solutions to meet your unique requirements.

Our experienced and professional team ensures that we deliver products of the highest quality. We are proud to have exported our bearings to numerous countries and regions worldwide, including Europe, North America, India, Thailand, South Korea, Mexico, Turkey, Argentina, Russia, and many others.

Our bearings have earned a strong reputation for reliability and performance among our global customer base. We invite customers, business partners, and friends from all over the world to connect with us for mutually beneficial cooperation.

FAQ

1. What are ceramic bearings?
Ceramic bearings are bearings made from advanced ceramic materials such as Zirconia (ZrO2) or Silicon Nitride (Si3N4). They are known for their high strength, wear resistance, and ability to perform in extreme conditions.

2. What are the advantages of ceramic bearings over steel bearings?
Ceramic bearings offer several advantages, including:

  Higher Durability: Resistant to wear, corrosion, and high temperatures.
  Lighter Weight: Up to 40% lighter than steel bearings.
  Non-Magnetic & Electrically Insulating: Ideal for sensitive applications.
  Low Friction: Reduces energy loss and heat generation.
3. In which industries are ceramic bearings commonly used?
Ceramic bearings are widely used in:

  Packaging equipment
  Renewable energy (e.g., wind turbines)
  Aerospace and automotive
  Medical devices
  Chemical processing
  High-precision tools
4. Can ceramic bearings handle high temperatures?
Yes, ceramic bearings are highly resistant to heat and can operate in temperatures exceeding 1,000°C, depending on the material used.

5. Are ceramic bearings suitable for corrosive environments?
Absolutely! Ceramic bearings are non-reactive to most chemicals, making them ideal for use in highly corrosive environments.

6. What is the lifespan of ceramic bearings?
Ceramic bearings typically last much longer than steel bearings due to their wear resistance and durability. However, the exact lifespan depends on the operating conditions and maintenance practices.

7. How do I maintain ceramic bearings?
Ceramic bearings require minimal maintenance, but to ensure longevity:

  Use the correct lubrication when necessary.
  Keep them clean and free from contaminants.
  Follow proper installation procedures.
8. Do you provide customized ceramic bearings?
Yes, we offer tailored ceramic bearing solutions to meet your specific application requirements. Contact us to discuss your needs.

9. What sizes and types of ceramic bearings do you offer?
We supply a wide range of sizes and configurations, including ball bearings, roller bearings, and hybrid bearings. Check our product catalog or contact us for more details

10. How can I place an order or request a quote?
Simply visit our Contact Us page, fill out the inquiry form, or reach out to us directly via email or phone. Our team will respond promptly with the information you need