NMT Ltd.
Corporate Communications Department
日本恩姆梯NMT KDN.K02508XP0K四点接触薄壁轴承——精密紧凑设计的理想之选
In modern precision machinery and robotic joint design, the trade-off between space and performance is a constant challenge. NMT (Japan Enmuti) KDN.K02508XP0K four-point contact ball bearing offers an elegant and efficient solution, combining slim-profile design with exceptional load capacity and rigidity.
Product Overview
The KDN.K02508XP0K is a constant-section thin-section four-point contact ball bearing (Type X). Its core design principle: the cross-section remains constant as the bore diameter increases. This allows designers to use the same thin-profile bearing solution across different joint sizes—from small collaborative robot arms to large heavy-duty manipulators—significantly simplifying housing groove machining and inspection processes.
Basic Dimensions:
Bore diameter (d): 25 mm
Outside diameter (D): 41 mm
Width (B): 8 mm (radial cross-section: 8 mm)
Contact angle: 30°
Number of rows: Single row
Performance Data:
Limiting speed: 4,060 r/min
Basic dynamic load rating: 4.89 kN
Basic static load rating: 4.55 kN
Technical Features
1. Four-Point Contact Design – Comprehensive Load Capacity
As a Type X four-point contact ball bearing, the KDN.K02508XP0K can simultaneously accommodate radial loads, bidirectional axial loads, and moment loads. A single bearing replaces the need for paired angular contact ball bearings in face-to-face or back-to-back arrangements, resulting in a more compact structure. The balls contact the raceways at four points, ensuring stable operation under various load directions.
2. Constant Thin Section – Ultimate Compactness
Built on the principle that "a single cross-section remains constant as the bore diameter increases," this bearing requires only 8 mm of radial space at a 25 mm bore diameter. It requires considerably less axial space than two angular contact ball bearings. Lightweight, low-friction, high-rigidity, and high running accuracy make it the ideal choice for space-constrained applications.
3. Precision Manufacturing – Reliable and Durable
The bearing is manufactured from bearing steel, with a cage available in brass or non-metallic composite materials. The design is open-type with no seals, no coating, and no lubricant (customizable upon request), allowing users to configure lubrication solutions based on actual operating conditions. Net weight is approximately 0.1 kg, conforming to the metric measurement system.
4. Environmental Responsibility
The indicative carbon footprint of this product is 0.37 kg CO₂e, reflecting NMT's commitment to sustainable development.
Application Scenarios
With its thin-section, lightweight, and high-load-capacity characteristics, the KDN.K02508XP0K is widely used in:
Industrial robot joints: wrists, elbows, shoulders, and other confined spaces
Machine tools and precision equipment: high-speed spindles, rotary tables
Medical devices: surgical robots, imaging equipment
Satellites and aerospace: lightweight high-precision mechanisms
Optical and inspection equipment: precision positioning stages
Material handling and automation systems
Why Choose NMT?
NMT (Japan Enmuti) enjoys an outstanding reputation in the precision bearing industry. By optimizing the raceway curvature and ball diameter ratio, NMT's constant-section thin-section bearings deliver rigidity that exceeds visual expectations despite their slim profile. NMT has also optimized cage designs for typical operating conditions—frequent start-stop cycles, reciprocating oscillations, and momentary overloads—with precisely calculated pocket shapes and clearances that effectively suppress vibration and noise during high-speed operation. Additionally, NMT has developed low-particle lubrication solutions and specialized surface treatment processes to ensure stable performance over extended service life.
Choosing NMT is not just choosing a bearing—it is an investment in the long-term reliability of your equipment.