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The Nachi 5203-2NSL double-row angular contact ball bearing is double-sealed and has a 20-degree contact angle, pressed steel cage, and normal clearance rating. It supports radial loads, thrust loads in both directions, and combined loads, and occupies less thrust space than a pair of single-row angular contact ball bearings mounted together. Because the two rows of rolling elements are mounted back-to-back, the bearing arrangement is relatively rigid and can accommodate tilting moments. The 52 series has a smaller cross section than the 53 series, making it suitable for smaller spaces, lighter loads, and higher speeds. This bearing is made of low-alloy, through-hardened carbon chromium steel for durability and resistance to deformity under heavy loads. The 20-degree contact angle of the balls in relation to the raceways gives the bearing a greater capacity for supporting thrust loads over bearings with a standard contact angle of zero degrees. Rubber seals on both sides of the bearing keep out contaminants such as dirt and grime and hold in lubricant applied at manufacture. This bearing has a pressed steel cage to prevent the balls from coming into contact with each other during use, reducing friction, vibration, and noise. The bearing has a normal axial internal clearance designation, making it suitable for applications where the load and speeds do not result in thermal expansion. This clearance provides latitude for self-realignment and compensates for static and dynamic alignment errors. This angular contact ball bearing is for use in commercial and industrial applications including pumps and compressors, automotive drives, gearboxes, and printing machines, among others.
Rolling bearings use rolling elements to maintain the separation between moving parts to reduce rotational friction and support radial and axial loads. These elements can be one of the following types: ball, cylindrical, spherical, barrel, needle, spindle, or tapered. All rolling bearings are open, shielded, or sealed. Sealed bearings are lubricated with oil or grease in the bearing factory, while open and shielded bearings are meant to be lubricated in place, with periodic reapplication of lubrication, based on use. The shield protects the working parts of the bearing from environmental debris that may be introduced and could reduce the ball bearing speed and lifespan. Rolling bearings are used in a range of applications from agricultural machinery to conveying equipment, robotics, dental equipment, elevators, rolling mills, ship rudder shafts, and aggregate crushers, among others.
Nachi-Fujikoshi manufactures bearings, cutting tools, hydraulic equipment, and high speed steel for industrial applications. The company, founded in 1928, is headquartered in Toyama, Japan.
Chris
Reviewed in the United States on July 10, 2024
The OEM bearing is easily pressed/tapped out of the pulley with a large socket, press the new nachi back in, easily done with a vice or a 2" threaded bolt and nut and some washers. I did this at 150K and I didn't realize how noisy all the pulleys had gotten, I replaced the 3 idlers and this bearing in the tensioner during a waterpump job and afterwards it sounded like a new motor, I can hear the injectors ticking at idle again. For me between 100 and 150K they pulleys starting getting louder. I highly recommend this over the other single row options and it's hours less work then replacing the tensioner.
Part Time Ninja
Reviewed in the United States on January 26, 2023
Japan bearing quality. Many thanks for Chuy’s review.
Dave
Reviewed in the United States on February 15, 2020
Used this bearing to replace the tensioner pulley bearing on my 2005 Tacoma 4.0 V6. The pulley is not available from Toyota unless you buy the entire tensioner for $150+. The tensioner is also a HUGE pain to replace (requires alternator being unbolted.Save money and just buy the bearing. WARNING: THE TENSIONER PULLEY BOLT IS REVERSE-THREADED! TURN CLOCKWISE TO LOOSEN!You’ll need either a bench vise or bearing press to really do the job right but I can see how you could also hammer the bearing in and out with a 5lb sledge, the right size sockets and some wood bracing against a concrete floor.
Chuy!
Reviewed in the United States on January 1, 2017
Replaced bearing in tensioner pulley in 07 Tacoma V6. Saved me $$ over replacing the entire tensioner assembly as no one sells a pulley/bearing assembly for the tensioner. OEM was NSK BD17-31DUM. Will report back if bearing does not hold up.
I Feel the Need, the Need to Read book blog
Reviewed in the United States on December 20, 2013
This is a great buy for a factory oem bearing. Amazon seems to be about the only place to get it. I highly recommend this bearing.
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