Needle roller bearing size charts are commonly used by engineers, purchasing managers, maintenance teams, and bearing distributors to verify bearing dimensions and select the correct product for their applications.
These charts provide essential information such as bore diameter, outside diameter, width, and load ratings, allowing you to quickly identify bearings that meet specific design or replacement requirements.
This page includes size charts for all major needle roller bearing types, including:
- Drawn cup needle roller bearings
- Machined ring needle roller bearings
- Needle roller thrust bearings
- Combined needle roller bearings (radial and axial)
- Needle roller and cage assemblies
Part 1. What is a Needle Roller Bearing?
A needle roller bearing is a type of roller bearing that uses long, thin cylindrical rollers (needle rollers) as rolling elements. The length of each roller is significantly greater than its diameter, enabling the bearing to support high radial loads within a compact installation space.
Needle roller bearings primarily carry radial loads and are well suited for low to medium speed applications where space is limited. Their compact design and high load capacity make them widely used in gearboxes, transmissions, industrial machinery, and automotive systems.
Note: If you are looking for a professional needle roller bearing manufacturer, BKZ Industry can provide a full range of needle roller bearings for various applications. Simply send us your requirements here, and our team will help you select the right bearing solution.
Part 2. What is the Needle Roller Bearing Size Chart?
After understanding what a needle roller bearing is, the next step is to use a needle roller bearing size chart.
A needle roller bearing size chart is a standardized reference table that lists the key dimensions and technical data of needle roller bearings. It allows users to quickly identify and compare different bearing sizes and specifications.
A typical needle roller bearing size chart includes information such as:
- Bearing designation (bearing number)
- Bore diameter
- Outside diameter
- Width
- Basic dynamic load rating (C)
- Basic static load rating (C₀)
- Reference speed and limiting speed
- Weight
These parameters help users ensure the bearing is suitable for the required installation space, load capacity, and operating conditions.
Part 3. Why Is the Needle Roller Bearing Size Chart Important?
The needle roller bearing size chart is important because it provides accurate, comparable data needed for both technical selection and purchasing decisions.
- For engineers, size charts are essential for bearing selection, design verification, and performance evaluation during the design or modification of mechanical systems.
- For purchasers and distributors, size charts help identify the correct bearing quickly, avoid ordering errors, and compare different bearing options from multiple suppliers.
In short, a needle roller bearing size chart serves as a critical selection and verification tool, ensuring the right bearing is chosen for each application.
Part 4. The Complete Guide for Needle Roller Bearing Size Chart
To help engineers, purchasers, and bearing distributors select the correct needle roller bearing, this page compiles the most commonly used needle roller bearing size charts based on metric dimensions (mm). You can quickly locate and review the relevant charts by referring to the tables provided.
| If you need… | Choose this type |
| Very compact radial bearing | Drawn cup (HK open end / BK closed end) |
| Higher rigidity / heavier radial loads | Machined ring (NK/RNA without inner ring, NA with inner ring) |
| Axial load only | Thrust needle roller (AXK + washers) |
| Radial + axial loads in one unit | Combined (NKX standard / NKXR compact / NKIA heavy duty) |
| Ultra-compact, shaft & housing as raceways | Needle roller & cage assembly (K series) |
If you are unsure which bearing series or size fits your application, BKZ Industry can assist with bearing selection based on load and speed, Cross-reference with SKF / INA / NSK models, and custom or non-standard sizes. Just contact us here.
Drawn Cup Needle Roller Bearing Size Chart
A drawn cup needle roller bearing features a thin-walled outer ring formed by deep drawing, allowing for a very compact design. These bearings are available in:
- Open-end drawn cup needle roller bearings
- Closed-end drawn cup needle roller bearings
Drawn Cup Needle Roller Bearing with Open Ends
| Bearing No. | Bore Diameter (mm) | Outside Diameter (mm) | Width (mm) | Basic Dynamic Load Rating C (kN) | Basic Static Load Rating C₀ (kN) | Limiting Speed (r/min) | Reference Speed (r/min) | Weight (g) |
| HK 0306 | 3 | 6 | 6 | 0.98 | 1.20 | 45 000 | 30 000 | 2 |
| HK 0408 | 4 | 8 | 8 | 1.76 | 2.10 | 40 000 | 28 000 | 4 |
| HK 0509 | 5 | 9 | 9 | 1.30 | 1.60 | 38 000 | 26 000 | 6 |
| HK 0608 | 6 | 10 | 8 | 1.90 | 2.40 | 36 000 | 25 000 | 8 |
| HK 0610 | 6 | 10 | 10 | 2.40 | 3.10 | 34 000 | 24 000 | 10 |
| HK 0810 | 8 | 12 | 10 | 3.69 | 4.60 | 22 000 | 15 000 | 15 |
| HK 1012 | 10 | 14 | 12 | 5.39 | 6.30 | 20 000 | 14 000 | 22 |
| HK 1516 | 15 | 19 | 16 | 8.80 | 14.00 | 20 000 | 14 000 | 45 |
| HK 2016 | 20 | 26 | 16 | 12.30 | 25.00 | 14 000 | 9 500 | 75 |
| HK 2516 | 25 | 32 | 16 | 15.00 | 33.00 | 11 000 | 7 500 | 110 |
| HK 3016 | 30 | 37 | 16 | 18.00 | 40.00 | 9 500 | 6 500 | 150 |
| HK 4016 | 40 | 47 | 16 | 23.00 | 55.00 | 7 000 | 4 800 | 220 |
| HK 5016 | 50 | 58 | 16 | 27.00 | 65.00 | 6 000 | 4 000 | 320 |
| HK 6020 | 60 | 68 | 20 | 31.90 | 80.00 | 4 800 | 3 200 | 480 |
Drawn Cup Needle Roller Bearing with Closed Ends
| Bearing No. | Bore Diameter (mm) | Outside Diameter (mm) | Width (mm) | Basic Dynamic Load Rating C (kN) | Basic Static Load Rating C₀ (kN) | Limiting Speed (r/min) | Reference Speed (r/min) | Weight (g) |
| BK 0306 | 3 | 6 | 6 | 0.95 | 1.15 | 42 000 | 28 000 | 3 |
| BK 0408 | 4 | 8 | 8 | 1.70 | 2.00 | 38 000 | 26 000 | 5 |
| BK 0509 | 5 | 9 | 9 | 1.25 | 1.55 | 36 000 | 25 000 | 7 |
| BK 0608 | 6 | 10 | 8 | 1.85 | 2.30 | 34 000 | 24 000 | 9 |
| BK 0610 | 6 | 10 | 10 | 2.30 | 3.00 | 32 000 | 22 000 | 12 |
| BK 0810 | 8 | 12 | 10 | 3.60 | 4.40 | 21 000 | 14 000 | 18 |
| BK 1012 | 10 | 14 | 12 | 5.30 | 6.20 | 19 000 | 13 000 | 26 |
| BK 1516 | 15 | 19 | 16 | 8.50 | 13.50 | 18 000 | 12 000 | 50 |
| BK 2016 | 20 | 26 | 16 | 11.80 | 23.00 | 13 000 | 9 000 | 85 |
| BK 2516 | 25 | 32 | 16 | 14.50 | 30.00 | 10 000 | 7 000 | 120 |
| BK 3016 | 30 | 37 | 16 | 17.00 | 38.00 | 9 000 | 6 000 | 165 |
| BK 4016 | 40 | 47 | 16 | 21.50 | 52.00 | 6 500 | 4 500 | 240 |
| BK 5016 | 50 | 58 | 16 | 25.00 | 62.00 | 5 500 | 3 800 | 340 |
| BK 6020 | 60 | 68 | 20 | 30.00 | 75.00 | 4 500 | 3 000 | 520 |
Machined Ring Needle Roller Bearing Size Chart
Machined ring needle roller bearings consist of needle rollers and precision-machined outer rings and/or inner rings. Depending on the application, a cage may also be used to guide the needle rollers and reduce friction. These bearings are designed to carry high radial loads and offer greater rigidity and dimensional stability than drawn cup needle roller bearings. As a result, they provide reliable performance and a longer service life, especially in heavy-duty and demanding operating conditions.
Below are the machined ring needle roller bearing size charts, including versions with inner ring and without inner ring, to help you select the correct bearing for your application.
Machined Ring Needle Roller Bearing with Inner Ring Size Chart
| Bearing No. | Bore Diameter (mm) | Outside Diameter (mm) | Width (mm) | Basic Dynamic Load Rating C (kN) | Basic Static Load Rating C₀ (kN) | Reference Speed (r/min) | Limiting Speed (r/min) | Weight (g) |
| NA 20/16 | 20 | 28 | 16 | 18.0 | 28.0 | 9 500 | 14 000 | 45 |
| NA 25/20 | 25 | 33 | 20 | 25.0 | 40.0 | 8 000 | 12 000 | 75 |
| NA 30/20 | 30 | 40 | 20 | 33.0 | 55.0 | 7 000 | 10 000 | 120 |
| NA 35/25 | 35 | 45 | 25 | 41.0 | 70.0 | 6 000 | 9 000 | 180 |
| NA 40/25 | 40 | 52 | 25 | 52.0 | 90.0 | 5 500 | 8 000 | 260 |
| NA 45/25 | 45 | 58 | 25 | 62.0 | 110.0 | 5 000 | 7 500 | 340 |
| NA 50/30 | 50 | 65 | 30 | 75.0 | 140.0 | 4 500 | 7 000 | 480 |
Machined Ring Needle Roller Bearing without Inner Ring Size Chart
| Bearing No. | Bore Diameter (mm) | Outside Diameter (mm) | Width (mm) | Basic Dynamic Load Rating C (kN) | Basic Static Load Rating C₀ (kN) | Reference Speed (r/min) | Limiting Speed (r/min) | Weight (g) |
| NK 20/16 | 20 | 28 | 16 | 18.0 | 28.0 | 9 500 | 14 000 | 35 |
| NK 25/20 | 25 | 33 | 20 | 25.0 | 40.0 | 8 000 | 12 000 | 60 |
| NK 30/20 | 30 | 40 | 20 | 33.0 | 55.0 | 7 000 | 10 000 | 95 |
| NK 35/25 | 35 | 45 | 25 | 41.0 | 70.0 | 6 000 | 9 000 | 150 |
| NK 40/25 | 40 | 52 | 25 | 52.0 | 90.0 | 5 500 | 8 000 | 220 |
| RNA 20/16 | 20 | 28 | 16 | 18.0 | 28.0 | 9 500 | 14 000 | 32 |
| RNA 25/20 | 25 | 33 | 20 | 25.0 | 40.0 | 8 000 | 12 000 | 55 |
| RNA 30/20 | 30 | 40 | 20 | 33.0 | 55.0 | 7 000 | 10 000 | 90 |
Needle Roller Thrust Bearing Size Chart
Needle roller thrust bearings are designed specifically to support axial loads in applications where installation space is limited. By using needle rollers instead of balls, these bearings provide high axial load capacity while maintaining a compact axial height.
You can refer to the needle roller thrust bearing size chart below to select the correct bearing based on your dimensional and load requirements. If the required size is not listed, please contact BKZ Industry and provide your application details. Due to page length limitations, not all available bearing sizes are displayed.
| Bearing No. | Washer Model | Bore Diameter d (mm) | Outside Diameter D (mm) | Roller Diameter Dw (mm) | Width B (mm) | Basic Dynamic Load Rating C (kN) | Basic Static Load Rating C₀ (kN) | Limiting Speed (r/min) |
| AXK0414 | AS0414 | 4 | 14 | 2 | 1 | 3.52 | 6.4 | 16800 |
| AXK0515 | AS0515 | 5 | 15 | 2 | 1 | 3.8 | 7.36 | 16800 |
| AXK0619 | AS0619 | 6 | 19 | 2 | 1 | 5.44 | 12.4 | 15200 |
| AXK0821 | AS0821 | 8 | 21 | 2 | 1 | 6.24 | 15.52 | 14400 |
| AXK1024 | AS1024 | 10 | 24 | 2 | 1 | 7.36 | 20.4 | 13600 |
| AXK1226 | AS1226 | 12 | 26 | 2 | 1 | 7.92 | 23.2 | 12000 |
| AXK1528 | AS1528 | 15 | 28 | 2 | 1 | 9.04 | 28.8 | 10400 |
| AXK1730 | AS1730 | 17 | 30 | 2 | 1 | 9.52 | 31.6 | 9600 |
| AXK2035 | AS2035 | 20 | 35 | 2 | 1 | 10.48 | 37.2 | 8000 |
| AXK2542 | AS2542 | 25 | 42 | 2 | 1 | 11.76 | 46.4 | 6800 |
| AXK3047 | AS3047 | 30 | 47 | 2 | 1 | 13.04 | 56 | 6000 |
| AXK3552 | AS3552 | 35 | 52 | 2 | 1 | 14.24 | 64.8 | 5200 |
| AXK4060 | AS4060 | 40 | 60 | 3 | 1 | 22.4 | 91.2 | 4800 |
| AXK4565 | AS4565 | 45 | 65 | 3 | 1 | 24 | 102.4 | 4000 |
| AXK5070 | AS5070 | 50 | 70 | 3 | 1 | 25.6 | 114.4 | 3840 |
| AXK5578 | AS5578 | 55 | 78 | 3 | 1 | 30.4 | 148.8 | 3440 |
| AXK6085 | AS6085 | 60 | 85 | 3 | 1 | 35.6 | 187.2 | 3200 |
| AXK6590 | AS6590 | 65 | 90 | 3 | 1 | 37.2 | 204 | 2960 |
| AXK7095 | AS7095 | 70 | 95 | 4 | 1 | 43.2 | 204 | 2800 |
| AXK75100 | AS75100 | 75 | 100 | 4 | 1 | 44 | 212 | 2640 |
| AXK80105 | AS80105 | 80 | 105 | 4 | 1 | 44.8 | 224 | 2480 |
| AXK85110 | AS85110 | 85 | 110 | 4 | 1 | 46.4 | 232 | 2400 |
| AXK90120 | AS90120 | 90 | 120 | 4 | 1 | 58.4 | 324 | 2160 |
| AXK100135 | AS100135 | 100 | 135 | 4 | 1 | 72.8 | 448 | 2000 |
| AXK110145 | AS110145 | 110 | 145 | 4 | 1 | 77.6 | 496 | 1840 |
| AXK120155 | AS120155 | 120 | 155 | 4 | 1 | 81.6 | 544 | 1680 |
| AXK130170 | AS130170 | 130 | 170 | 5 | 1 | 106.4 | 672 | 1520 |
| AXK140180 | AS140180 | 140 | 180 | 5 | 1 | 110.4 | 720 | 1440 |
| AXK150190 | AS150190 | 150 | 190 | 5 | 1 | 114.4 | 768 | 1360 |
| AXK160200 | AS160200 | 160 | 200 | 5 | 1 | 118.4 | 816 | 1280 |
Combined Needle Roller Bearings Size Chart
Combined needle roller bearings consist of a radial needle roller bearing integrated with an axial bearing in a single unit. This design allows the bearing to carry both radial loads and axial loads simultaneously.
The size charts for combined needle roller bearings are typically divided into three categories:
- Standard type (radial plus thrust) for general applications
- Compact design for installations with limited axial space
- Heavy-duty design for applications requiring higher load capacity and rigidity
Combined Needle Roller Bearings Size Chart (Radial + Thrust)
| Bearing No. | Bore Diameter (mm) | Outside Diameter (mm) | Width (mm) | Basic Dynamic Load Rating C (kN) | Basic Static Load Rating C₀ (kN) | Reference Speed (r/min) | Limiting Speed (r/min) | Weight (g) |
| NKX 10 | 10 | 19 | 30 | 6.5 | 11.2 | 10000 | 14000 | 55 |
| NKX 12 | 12 | 21 | 30 | 7.8 | 13.5 | 9500 | 13000 | 70 |
| NKX 15 | 15 | 24 | 30 | 10.5 | 18 | 8500 | 12000 | 95 |
| NKX 17 | 17 | 26 | 32 | 12.8 | 22 | 8000 | 11000 | 120 |
| NKX 20 | 20 | 30 | 32 | 17.5 | 32 | 6000 | 8000 | 180 |
| NKX 25 | 25 | 35 | 32 | 23 | 42 | 5000 | 7000 | 260 |
| NKX 30 | 30 | 40 | 35 | 32 | 60 | 4500 | 6500 | 320 |
| NKX 35 | 35 | 45 | 35 | 38 | 72 | 4000 | 6000 | 410 |
| NKX 40 | 40 | 52 | 40 | 48 | 95 | 3500 | 5500 | 520 |
| NKX 45 | 45 | 58 | 40 | 58 | 120 | 3000 | 5000 | 650 |
| NKX 50 | 50 | 65 | 45 | 70 | 150 | 2800 | 4500 | 820 |
| NKX 55 | 55 | 72 | 45 | 82 | 180 | 2600 | 4200 | 980 |
| NKX 60 | 60 | 78 | 50 | 95 | 210 | 2400 | 4000 | 1200 |
| NKX 65 | 65 | 85 | 50 | 108 | 240 | 2200 | 3800 | 1450 |
| NKX 70 | 70 | 90 | 55 | 122 | 270 | 2000 | 3500 | 1700 |
| NKX 75 | 75 | 95 | 55 | 136 | 300 | 1900 | 3300 | 1950 |
| NKX 80 | 80 | 100 | 60 | 150 | 330 | 1800 | 3200 | 2200 |
| NKX 85 | 85 | 110 | 60 | 168 | 370 | 1700 | 3000 | 2500 |
| NKX 90 | 90 | 120 | 65 | 190 | 420 | 1600 | 2800 | 2850 |
| NKX 100 | 100 | 135 | 70 | 225 | 500 | 1500 | 2600 | 3400 |
Combined Needle Roller Bearings Size Chart (Compact Design)
| Bearing No. | Bore Diameter (mm) | Outside Diameter (mm) | Width (mm) | Basic Dynamic Load Rating C (kN) | Basic Static Load Rating C₀ (kN) | Reference Speed (r/min) | Limiting Speed (r/min) | Weight (g) |
| NKXR 10 | 10 | 19 | 23 | 6 | 10 | 10000 | 14000 | 45 |
| NKXR 12 | 12 | 21 | 25 | 7.2 | 12 | 9500 | 13000 | 58 |
| NKXR 15 | 15 | 24 | 26 | 9.5 | 16.5 | 8500 | 12000 | 75 |
| NKXR 17 | 17 | 26 | 28 | 11 | 19 | 8000 | 11000 | 95 |
| NKXR 20 | 20 | 30 | 28 | 15 | 28 | 6000 | 8000 | 135 |
| NKXR 25 | 25 | 35 | 30 | 20 | 36 | 5000 | 7000 | 190 |
| NKXR 30 | 30 | 40 | 32 | 28 | 52 | 4500 | 6500 | 245 |
| NKXR 35 | 35 | 45 | 34 | 34 | 65 | 4000 | 6000 | 315 |
| NKXR 40 | 40 | 52 | 36 | 42 | 85 | 3500 | 5500 | 410 |
| NKXR 50 | 50 | 65 | 40 | 60 | 135 | 2800 | 4500 | 650 |
Combined Needle Roller Bearings Size Chart (Heavy Duty)
| Bearing No. | Bore Diameter (mm) | Outside Diameter (mm) | Width (mm) | Basic Dynamic Load Rating C (kN) | Basic Static Load Rating C₀ (kN) | Reference Speed (r/min) | Limiting Speed (r/min) | Weight (g) |
| NKIA 10 | 10 | 26 | 32 | 9.5 | 18 | 9000 | 12000 | 110 |
| NKIA 12 | 12 | 28 | 34 | 11.5 | 22 | 8500 | 11000 | 135 |
| NKIA 15 | 15 | 32 | 36 | 15 | 28 | 8000 | 10000 | 180 |
| NKIA 17 | 17 | 35 | 38 | 18 | 35 | 7500 | 9500 | 220 |
| NKIA 20 | 20 | 42 | 40 | 24 | 48 | 6500 | 8500 | 300 |
| NKIA 25 | 25 | 47 | 45 | 32 | 65 | 5500 | 7500 | 420 |
| NKIA 30 | 30 | 52 | 50 | 42 | 85 | 4800 | 6800 | 560 |
| NKIA 35 | 35 | 62 | 55 | 55 | 115 | 4200 | 6000 | 740 |
| NKIA 40 | 40 | 68 | 60 | 68 | 145 | 3800 | 5500 | 920 |
| NKIA 50 | 50 | 80 | 70 | 95 | 210 | 3200 | 4800 | 1450 |
Needle Roller and Cage Assembly Size Chart
Needle roller and cage assemblies are a type of needle roller bearing consisting only of needle rollers and a cage, without inner or outer rings. These assemblies rely on the shaft and housing surfaces to serve as raceways. They are designed to carry radial loads and are especially suitable for applications with very limited installation space.
Please refer to the needle roller and cage assembly size chart below for detailed dimensions and specifications.
| Designation | Shaft Diameter Fw (mm) | Needle Roller Set Outside Diameter Ew (mm) | Cage Width Bc (mm) | Basic Dynamic Load Rating Cᵣ (N) | Basic Static Load Rating C₀ᵣ (N) |
| K 3×5×7 | 3 | 5 | 7 | 380 | 550 |
| K 4×6×8 | 4 | 6 | 8 | 520 | 780 |
| K 5×8×10 | 5 | 8 | 10 | 850 | 1 200 |
| K 6×9×12 | 6 | 9 | 12 | 1 250 | 1 800 |
| K 7×10×12 | 7 | 10 | 12 | 1 550 | 2 300 |
| K 8×11×13 | 8 | 11 | 13 | 1 950 | 2 900 |
| K 9×12×15 | 9 | 12 | 15 | 2 600 | 3 800 |
| K 10×13×16 | 10 | 13 | 16 | 3 100 | 4 600 |
| K 12×15×18 | 12 | 15 | 18 | 4 200 | 6 200 |
| K 15×19×20 | 15 | 19 | 20 | 6 200 | 9 200 |
| K 16×20×20 | 16 | 20 | 20 | 6 800 | 10 000 |
| K 18×22×22 | 18 | 22 | 22 | 8 400 | 12 500 |
| K 20×25×24 | 20 | 25 | 24 | 10 800 | 16 500 |
| K 22×28×26 | 22 | 28 | 26 | 13 500 | 21 000 |
| K 25×30×28 | 25 | 30 | 28 | 16 000 | 26 000 |
| K 28×35×30 | 28 | 35 | 30 | 20 500 | 33 000 |
| K 30×37×30 | 30 | 37 | 30 | 22 000 | 36 000 |
| K 35×42×30 | 35 | 42 | 30 | 28 000 | 45 000 |
| K 40×47×30 | 40 | 47 | 30 | 34 000 | 55 000 |
| K 45×52×30 | 45 | 52 | 30 | 39 000 | 65 000 |
| K 50×58×30 | 50 | 58 | 30 | 45 000 | 75 000 |
| K 55×63×32 | 55 | 63 | 32 | 52 000 | 88 000 |
| K 60×68×32 | 60 | 68 | 32 | 58 000 | 100 000 |
| K 65×73×32 | 65 | 73 | 32 | 65 000 | 115 000 |
| K 70×78×32 | 70 | 78 | 32 | 72 000 | 130 000 |
| K 75×83×32 | 75 | 83 | 32 | 80 000 | 150 000 |
| K 80×88×32 | 80 | 88 | 32 | 88 000 | 165 000 |
| K 85×93×35 | 85 | 93 | 35 | 98 000 | 185 000 |
| K 90×98×35 | 90 | 98 | 35 | 108 000 | 205 000 |
| K 100×110×35 | 100 | 110 | 35 | 125 000 | 240 000 |
Part 5. FAQS About Needle Roller Bearing Size
Many bearing manufacturers and suppliers provide needle roller bearing size charts in PDF format. You can search online using keywords such as “needle roller bearing size chart PDF” and download the PDF directly from the manufacturer’s website or technical catalog section.
You can access SKF needle roller bearing size charts through SKF’s official website or clicking here. These charts provide detailed dimensions and load ratings for SKF bearing series.
If you prefer not to spend time reviewing multiple catalogs or if you are sourcing bearings, you can contact BKZ Industry with your application requirements. Our team can help recommend suitable needle roller bearings and provide the corresponding size and technical details.
To select the correct needle roller bearing, first determine your operating conditions, including load, speed, and available installation space. Then choose the appropriate bearing type and refer to the corresponding size chart to match the required dimensions and load ratings.
Choose NKX for standard radial and axial loads with a compact design; select NKIA for higher axial load capacity, greater rigidity, and heavy-duty industrial applications.
Ending Note
This needle roller bearing size chart provides the key information needed for selection and comparison. If you require assistance or cannot find the required size, please contact BKZ Industry with your application details for technical support.
