Precision Bearing 71908-C-2RSD-T-P4S-DUL_Ball Bearing,Roller Bearing,Pillow Block Bearing

Angular Contact Bearing 71908-C-2RSD-T-P4S-DUL

SEMRI 71907-C-2RSD-T-P4S-DUL Spindle Bearing

Brand	=	SEMRI
Manufacturer Part Number	=	71908-C-2RSD-T-P4S-DUL
Inside Diameter（d）	=	40mm
Outside Diameter（D）	=	62mm
Width（B）	=	12mm
Combined Width (2B)	=	24mm
Contact Angle (a)	=	15°
Precision Grade	=	P4S
Seals or Shields	=	Non Contact Seals
Clearance	=	CN = Standard Internal clearance
Cage Type	=	T = Outerring Guided Phenolic Cage

Key application areas and specific equipment scenarios are as follows:
1、 Micro Machine Tool Spindle: Many micro CNC engraving machines used for machining precision watches, light metals, graphite, or plastics have a very thin spindle journal (40mm), yet they require extremely high rotational speeds and cutting rigidity. The thin-walled structure of the 71908 perfectly adapts to its compact space. Mechanical Processing Dust Prevention: Graphite engraving and woodworking micro-carving generate high concentrations of fine dust, and metal cutting involves the spraying of cutting fluid. The 2RSD seal ring of this bearing blocks these contaminants from entering the bearing interior without reducing rotational speed, thus preventing lubricating grease from losing its effectiveness.

2、Precision multi-axis drilling spindle (multi-head drill / needle bed spindle) PCB multi-head drilling machine: To enhance processing efficiency, many PCB drilling machines are equipped with dozens of micro spindles installed side by side inside. The spacing between bearings is extremely small. The ultra-thin wall size allows the spindles to achieve a compact and side-by-side arrangement with ultra-high density. High anti-overturning force: When the micro drill bit cuts at high speed, the bearing needs to withstand strong axial reaction forces. The 15° contact angle (C) provides better axial rigidity than ordinary spindle bearings, preventing micrometer-level displacement of the spindle during down pressure.

3、 Industrial robot joint reducers and micro servo motors for precision medical/aerospace micro robotic arms: The end joints of modern precision robots (such as surgical robots and electronic assembly robotic arms) have extremely limited space, requiring bearings with light weight. These bearings not only achieve lightweight but also eliminate mechanical backlash through DUL (Differential Uniaxial Locking) to ensure high positioning accuracy. Highly integrated micro motors: The rear output shaft of high-rigidity servo motors is used to resist external axial play caused by transmission.

4、Precision optical measurement and semiconductor inspection instrument rotary worktable/panoramic camera scanner: precision laser scanning rotary table for three-coordinate measuring machines and semiconductor wafer inspection equipment. It is required that the rotating shaft remains "absolutely stable" within a very small space. This bearing, through paired installation and light pre-tightening, can provide excellent rotational axial and radial stability.

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