Spindle Bearing B71908-C-2RSD-P4S-UL

Hangzhou Huaxing Kechuang Holding Group Co., Ltd. is one of the leading manufacturers and suppliers of spindle bearing b71908-c-2rsd-p4s-ul in China. As we have world-leading production equipment and strong manufacturing capabilities, we warmly welcome you to buy bulk high quality bearings at competitive price from our factory.

Angular Contact Ball Bearing-CNC Machine Bearing-S71908CDGAP4A

Also know as H71908C-2RZSUMP4, B71908-E-2RSD-T-P4S-UM, KH61908CTAP4UM, 71908CTRV1VELP4

1. The 71908 series is a universal ultra-thin wall, super-precision single-row angular contact steel ball spindle bearing with unified dimensional specifications (40×62×12mm). Covering multiple mainstream manufacturer configurations, this full steel ball sealed series features standardized internal optimization, high modular compatibility and exclusive spindle-oriented performance, forming unique technical advantages different from conventional standard bearings:

   1. Dual Contact Angle Adaptation & Balanced Speed-Load Performance. The series integrates 15° (C-type) and 25° (AC-type) optional contact angle designs, covering low-heat high-speed and high-rigidity heavy-load working modes. The 15° contact angle version delivers ultra-low friction and stable high-speed rotation, while the 25° version greatly enhances axial load capacity. Optimized internal raceway geometry and special low-noise cage structure across all 71908 models effectively reduce rolling friction and rotational heat generation, achieving reliable continuous high-speed operation with a high limiting speed rating suitable for precision spindle dynamic operation.

   2. Ultra-High Precision Consistency & Universal Matchability. All series models adopt strict P4/P4S high-precision grade standards, with partial configurations upgraded to P4A ultra-precision level. Featuring ultra-precision raceway grinding and high-purity steel ball screening technology, the bearings achieve ultra-low radial and axial runout. With universal pairing compatibility (DB/DT/QBC) and standardized preload options (light/medium/heavy preload), they support arbitrary combined mounting, completely eliminating assembly clearance and ensuring consistent long-term rotational accuracy for spindle systems.

   3. Integrated Double-Sided Non-Contact Sealing Structure. Equipped with 2RZ/RSD dual-sided non-contact sealing configuration exclusive to 71908 spindle bearings, the all-steel matched sealing structure fits the thin-wall outline perfectly. It effectively isolates cutting fluid, dust, oil mist and workshop impurities without increasing rotational friction resistance. This maintenance-free sealing design avoids precision attenuation caused by environmental contamination, realizing long-term stable operation in complex machining environments and greatly extending service life.

   4. Thin-Wall High-Rigidity Structural Design. As a classic thin-wall precision spindle bearing, the 71908 series adopts an optimized asymmetric internal structure and high-strength bearing steel substrate. Despite its compact lightweight outline, it maintains excellent integral structural rigidity, effectively resisting micro-deformation under composite radial and axial cutting forces. It solves the rigidity deficiency problem of ordinary thin-wall bearings under dynamic load, ensuring stable spindle operation during high-precision cutting and finishing.

   5. Full-Series Steel Ball Structural Stability & Temperature Adaptability. Consistent with sealed steel ball spindle bearing architecture, all 71908 models adopt full steel ball rolling elements and steel raceway homogeneous matching, eliminating thermal expansion mismatch and structural abrasion risks of hybrid heterogeneous materials. It supports stable operation within -30℃ to 80℃ working temperature range, with excellent thermal stability and impact resistance, no precision drift under long-term variable temperature and continuous load conditions.

HXB Bearing (Formerly: Hangzhou Huaxing Bearing Co.,Ltd) is located at Hangzhou.

Established in May 1995, HXB has standardized its management with modern corporate system, passed the certification of Is09001: 2000 Quality Management System and ISO/TSI6949: 2002 Quality Management System, with a group of practical and innovative managerial team in product design, development, structural analysis, performance detection, manufacturing, and marketing, etc. Our product quality has passed the test of China Bearing Industry Association (CBIA), with various indexes reaching advanced level in China.

HXB mainly produces over 200 kinds of bearings, such as CNC machine bearings, high-precision mute deep groove ball motor bearing, auto-hub bearing, silicone oil fan spindle bearing, special bearing for textile machinery, and high-speed main shaft bearing for woodworking machinery, which are characterized by high precision, low noise, and long service life, and widely applied in high-precision lathe, CNC machining center, Y-series motor, automobile, motorbike, electric tool, home appliances, water pump, generator, textile machinery, and engineering machinery, etc.

HXB is confident that only high-quality bearing can enable the machine and products bring their performance into full play. With our permanent principle of "Guaranteeing the quality and technology and providing zealous and perfect service," we always specialize in manufacturing superior quality bearing by advanced equipment, strict quality control, and systematic management.

∗ 30 years of dedicated development

HXB was founded in 1995, with nearly 30 years of dedicated development, HXB now operates6 subsidiaries.

 

∗ 2 high-tech R&D centers

∗ 2 modern manufacturing factories - Hangzhou Yijia Precision Bearing Co., Ltd. and Zhejiang Ruiyang Bearing Technology Co., Ltd.

∗ Supported by advanced digital MES and SPC management systems

∗ IATF16949:2016, ISO9001:2015 and ISO14001 certifications

∗ High-end equipment and high-quality material

Bearing stiffness is defined as the load-to-deformation ratio, which directly determines spindle cutting stability, machining accuracy, and anti-vibration performance. Stiffness selection must match the spindle structure, load characteristics, speed range, and processing technology, especially for thin-wall series such as 71908 high-speed precision bearings.

1. Select by Internal Structure & Contact Angle

Contact angle is the core factor affecting stiffness. Larger contact angle delivers higher axial & composite stiffness, while smaller contact angle prioritizes high-speed stability with slightly lower rigidity:

15° contact angle (C-type): Low friction, low heat generation, suitable for high-speed light/medium load finishing. It balances basic stiffness and extreme speed, ideal for 71908 high-speed thin-wall spindle scenarios.

25° contact angle (AC-type): Higher axial rigidity and stronger composite load resistance, suitable for medium-speed medium-load precision cutting. It is the preferred configuration for improving the stiffness of thin-wall bearing spindles.

For thin-wall bearings (719 series) with inherently compact wall thickness, priority should be given to 25° contact angle models when stiffness requirements are strict to compensate for the slight rigidity gap of thin-wall structure.

2. Select by Bearing Arrangement Configuration

Different paired mounting modes bring significant stiffness differences, which is the key basis for spindle stiffness matching:

DB (Back-to-Back): Highest moment rigidity, strong resistance to overturning moment and radial deflection. The first choice for spindles requiring high structural stability and anti-deformation performance.

DT (Tandem): Maximizes unidirectional axial stiffness, suitable for equipment with long-term single-directional axial load impact.

QBC Multi-bearing Combination: Further improves overall system rigidity, reduces unit deformation, and adapts to continuous batch machining with high stability requirements.

3. Select by Preload Grade (Core Stiffness Matching)

Preload eliminates internal clearance and increases the contact quantity between rolling elements and raceways, which is the most direct way to improve bearing working stiffness. Match preload according to working conditions:

Light Preload: For ultra-high speed, low-load finishing; avoids excessive heat generation while maintaining basic precision stiffness.

Medium Preload: Universal for most precision machining centers, lathes and grinding spindles; balances high speed and rigidity, suitable for 71908 conventional high-speed precision scenarios.

Heavy Preload: For heavy cutting, strong impact and low-speed high-rigidity scenarios; maximizes system rigidity and suppresses cutting vibration.

4. Select by Working Condition Matching Principle

High-speed finishing (71908 mainstream scenario): Prioritize moderate stiffness + low friction, match 15° contact angle + light/medium preload to avoid thermal drift caused by excessive preload heat.

Medium-load precision cutting: Prioritize rigidity stability, match 25° contact angle + medium preload + DB pairing configuration.

Heavy-load rough machining: Avoid thin-wall bearings; select standard wall-thickness bearings with heavy preload and multi-bearing combined arrangement.