Needle Roller Bearing Without Inner Rings: +NK 5/10 TN

Product Name: Needle Roller Bearing Without Inner Rings: +NK 5/10 TN
Type: Roller Bearing Brand : FODA
New Model: +NK 5/10 TN Old Model:
Inner Diameter (mm): 5 Outer Diameter (mm): 10
Thickness (mm): 10 Limiting Speed (rpm): 39000

Description

Basic Parameters

The +NK 5/10 TN is a needle roller bearing without an inner ring, designed for applications where space is limited and the shaft itself serves as the raceway. This bearing features a bore diameter of 5 mm, an outer diameter of 10 mm, and a width of 5 mm, with a compact design that utilizes cylindrical needle rollers guided by a TN-type cage, typically made of polyamide for lightweight and durable operation. Constructed with a outer ring made from high-quality bearing steel for excellent wear resistance, the bearing has a rated dynamic load capacity (C₁₀) of approximately 1.8 kN and a rated static load capacity (C₀₁₀) of around 2.5 kN, suitable for moderate radial loads. The limiting speed under well-lubricated conditions is up to 15,000 rpm, making it suitable for high-speed applications. Its inner ring-less structure allows direct contact between the rollers and the hardened shaft surface, reducing overall cross-sectional dimensions while maintaining reliable performance in machinery such as gearboxes, pumps, and transmission systems where space efficiency and radial load handling are critical.

Product Application

In compact transmission structures of industrial machinery, the +NK 5/10 TN bearing demonstrates unique advantages through its inner-ring-less design. With a super-compact size of 5mm inner diameter and 10mm outer diameter, it is suitable for space-constrained scenarios such as gearbox speed increasers and servo motor output shaft connections. The bearing uses a TN-type polyamide cage to guide cylindrical needle rollers, ensuring uniform distribution of rolling elements at high speeds (up to 15,000 rpm) and reducing frictional heat generation. This makes it ideal for precision transmission in automated production lines and printing machine drum support structures. The design of using the shaft surface directly as the raceway requires the mating shaft diameter to be quenched (hardness ≥ HRC58), enabling a 20% radial space saving compared to traditional bearings with inner rings while achieving the same load capacity.
Precision Assembly of Automotive Components
In the trend of automotive miniaturization, this bearing is widely used in worm shaft supports of electric power steering systems (EPS), automatic transmission shifting mechanisms, and high-pressure fuel pump bearings in engines. Take the steering system as an example: the bearing must withstand alternating radial loads (rated dynamic load 1.8 kN) during steering operations. The combination of its lightweight polyamide cage and steel outer ring not only meets the wide-temperature working environment of -40°C to 120°C but also reduces component weight (only 1.2g per bearing) through the inner-ring-less structure, aligning with the automotive industry’s demand for weight reduction and energy efficiency. In high-speed fuel pump operations, the 15,000 rpm limiting speed ensures stable fuel delivery, avoiding wear issues caused by inner ring slippage in traditional bearings.
Precision Instruments and Consumer Electronics
In the miniaturization design of precision instruments, such as optical lens focusing mechanisms and rotating joints of portable detection equipment, the high precision (ISO tolerance grade IT9) and low friction (starting torque ≤ 0.3N·m) of the +NK 5/10 TN bearing play a key role. The precise grinding of its outer ring raceway (surface roughness Ra ≤ 0.2μm) ensures smooth rotational movement, suitable for equipment requiring sub-micron positioning accuracy. In the consumer electronics field, it can be applied to high-end drone motor shafts and hinge structures of foldable screens. The inner-ring-less design simplifies the assembly process by directly press-fitting the bearing onto a hardened stainless steel shaft, reducing the number of components and enhancing product reliability.
Fluid Machinery and Pump Equipment
In impeller shaft supports of micro water pumps and vacuum pumps, the bearing faces potential corrosion risks from liquid media (requiring anti-rust grease) and radial load fluctuations. The steel outer ring of the +NK 5/10 TN, surface-hardened (hardness ≥ HRC62), exhibits excellent wear resistance and can withstand impact loads during pump startup (static load 2.5 kN). Its ultra-thin design with a width of 5mm allows axial space optimization in narrow pump cavities, making it particularly suitable for volume-sensitive applications such as household water purifier booster pumps and medical infusion pumps. The bearing’s open structure (non-sealed design) allows users to select appropriate sealing solutions according to working conditions, enhancing application flexibility.
Customized Mechanical Solutions
For special working conditions, such as industrial robot joints in low-temperature environments or conveyor equipment idlers in high-dust environments, this bearing can expand its application boundaries through customized lubrication solutions (e.g., high-temperature lithium-based grease or low-temperature synthetic oil). The inner-ring-less structure allows users to achieve precise matching according to actual shaft diameter tolerances (recommended shaft tolerance m5), avoiding interference fit errors between traditional bearing inner rings and shafts, which is especially suitable for rapid assembly of small-batch customized equipment. In high-speed rotating platforms of experimental equipment, the bearing’s low inertia (moment of inertia ≤ 0.05g·cm²) helps improve system dynamic response performance, meeting research-grade precision requirements.

Product List

轴径
Shaft
Diameter
轴承型号
Bearing Designation
外型尺寸
Boundary Dimensions
基本额定负荷
Basic Load Ratings
极限转速
Limiting
Speed
Fw D c rs
C

Co
油润滑
Oil
mm mm min. N rpm
5 +NK 5/10 TN 5 10 10 0.15 2350 1920 39000
+NK 5/12 TN 5 10 12 0.15 3000 2650 39000
6 +NK 6/10 TN 6 12 10 0.15 2600 2280 37000
+NK 6/12 TN 6 12 12 0.15 3350 3150 37000
7 +NK 7/10 TN 7 14 10 0.3 2850 2650 34000
+NK 7/12 TN 7 14 12 0.3 3650 3600 34000
8 +NK 8/12 TN 8 15 12 0.3 3950 4100 32000
+NK 8/16 TN 8 15 16 0.3 5100 5800 32000
+NKS 8 TN 8 16 13 0.3 5000 4700 32000
9 +NK 9/12 TN 9 16 12 0.3 4500 5000 31000
+NK 9/16 TN 9 16 16 0.3 5900 7100 31000
10 +NK 10/12 TN 10 17 12 0.3 4750 5500 29000
+NK 10/16 TN 10 17 16 0.3 6200 7800 29000
+NKS 10 TN 10 19 13 0.3 5800 6000 29000
12 NK 12/12 12 19 12 0.3 6400 7100 27000
NK 12/16 12 19 16 0.3 9000 11000 27000
+NKS 12 TN 12 22 16 0.6 9600 10400 26000
14 NK 14/16 14 22 16 0.3 10100 11500 25000
NK 14/20 14 22 20 0.3 12800 15600 25000
+NKS 14 14 25 16 0.6 14400 13800 24000
RNA 4900 14 22 13 0.3 8500 9200 25000
15 NK 15/16 15 23 16 0.3 10700 12700 24000
NK 15/20 15 23 20 0.3 13600 17200 24000
+NKS 15 15 26 16 0.6 14400 14000 23000
16 NK 16/16 16 24 16 0.3 11300 13900 23000
NK 16/20 16 24 20 0.3 14400 18800 23000
+NKS 16 16 28 16 0.6 15700 15800 22000
RNA 4901 16 24 13 0.3 9400 10900 23000
RNA 6901 16 24 22 0.3 16000 21600 23000
17 NK 17/16 17 25 16 0.3 11900 15000 23000
NK 17/20 17 25 20 0.3 15100 20400 23000
18 NK 18/16 18 26 16 0.3 12500 16200 22000
NK 18/20 18 26 20 0.3 15800 22000 22000
+NKS 18 18 30 16 0.6 16800 17700 21000
19 NK 19/16 19 27 16 0.3 13000 17400 22000
NK 19/20 19 27 20 0.3 16500 23600 22000
□TN=塑料保险架,
允许运转温度,120°℃连续地,150℃临时地,180°℃短时地。’)对于脂润滑,允许值为表列数值的60%。+有档圈,无润滑油孔和槽,如需要油孔和槽时,需在轴承代号上增加ASR1。
TN=plastic retainer, permissible operational temperature 120’℃,150’C for temporary use,180’c for short time only ‘lor grease lub, the permissible value should be 60% of those in the listwith retaining ring, no lubricating holes or grooves, please add ASR1 before the bearing code if oil holes or grooves are needed for your products.

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