VRP/UPD bearing specs for aftermarket pullies
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Joined: Jun 2013
Posts: 1,814
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From: 'Merica
'04 E55 (Gone but not forgotten), '13 C63 P31 (RIP), another '13 C63 PP
VRP/UPD bearing specs for aftermarket pullies
It's time for me to replace the bearings in my aftermarket 5 piece pulley set. Does anyone know the specific bearings I need to buy? All I know is that they are Nachi bearings as stated on their websites, but I've had an extremely hard time trying to contact either UPD or VRP directly to get the exact specifications.
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Joined: Apr 2022
Posts: 379
Likes: 133
W211 E63 AMG
see my post here.
the NTN bearings i've replaced their incorrect specification with have been holding strong for a while now. 5x the price at 7 or 14 per bearing, i've forgotten, but well worth it. the NTN bearing is the highest RPM specification of any consumer available bearing. the factory pulley bearing is a higher RPM specification which is why it is uncommon for the bearing to fail with the factory polymer pulley and is custom order at quantities over 100,000 units.
the NTN bearings i've replaced their incorrect specification with have been holding strong for a while now. 5x the price at 7 or 14 per bearing, i've forgotten, but well worth it. the NTN bearing is the highest RPM specification of any consumer available bearing. the factory pulley bearing is a higher RPM specification which is why it is uncommon for the bearing to fail with the factory polymer pulley and is custom order at quantities over 100,000 units.
previous to the set of new OEM pulleys I killed at 12k the ones prior lasted 40-50k? I changed them out for safe measure not because of a failure. I do drive a lot more harsher than I used to. the ones that failed at 12k failed on a double gear kick down. that jolt of torque just broke the bearing support within the center of the pulley. It also took out my thermostat and housing.
here are the specs of the bearing.
NACHI 6203NSE bearing
d - 17 mm
D - 40 mm
B - 12 mm
C - 12 mm
r min. - 0.6 mm
da min. - 22 mm
Da max. - 35 mm
ra max. - 0.6 mm
Weight - 0.065 Kg
Basic dynamic load rating (C) - 9,55 kN
Basic static load rating (C0) - 4,8 kN
(Grease) Lubrication Speed - 12000 r/min
(Oil) Lubrication Speed - 21000 r/min
NTN
6203LLBC3/EM
Type
Deep Groove Ball Bearing
Bore Type
Round
Material
High Carbon Chrome Steel
Cage Type
Pressed
Cage Material
Steel
Ball Material
Steel
Limiting Speed - Grease
18000 RPM
Seal Type
Non-Contact
Seal Material
Nitrile Rubber
Precision
ISO Class 0
Configuration
One
Factor
12.8
Radial Internal Clearance
C3
Static Load Rating
1030 lbf4600 N4.60 kN
Dynamic Load Rating
2160 lbf9600 N9.60 kN
Enclosure
Double Sealed
Weight
0.141 lb0.064 kg
Operating Temperature Range
-40 to 250 ºF-40 to 120 ºC
Dimensional Specifications
Single Row Radial Ball Bearing - Double Sealed (Non-Contact Rubber Seal) - Dimensions
d
0.6693 in17.000 mm
D
1.5748 in40.000 mm
B
0.4724 in12.000 mm
r
0.0236 in0.600 mm
r1
0.0197 in0.500 mm
da min
0.8268 in21.000 mm
da max
0.9055 in23.000 mm
Da max
1.4173 in36.000 mm
ras max
0.0236 in0.600 mm
here are the specs of the bearing.
NACHI 6203NSE bearing
d - 17 mmD - 40 mm
B - 12 mm
C - 12 mm
r min. - 0.6 mm
da min. - 22 mm
Da max. - 35 mm
ra max. - 0.6 mm
Weight - 0.065 Kg
Basic dynamic load rating (C) - 9,55 kN
Basic static load rating (C0) - 4,8 kN
(Grease) Lubrication Speed - 12000 r/min
(Oil) Lubrication Speed - 21000 r/min
- Model Number: 6203NSE
- Inner Diameter：17mm Outer Diameter：40mm Width：12mm
- Type：Deep Groove Ball Bearings
- Update date：2018-08-03
- Application:vertical pull,engineering machine,SPA equipment,generator,air purification,dynamic blood pressure,diagnostic test paper,survey accessories,gantry processing,teaching equipment,Laser Measurements
NTN
6203LLBC3/EM
Type
Deep Groove Ball Bearing
Bore Type
Round
Material
High Carbon Chrome Steel
Cage Type
Pressed
Cage Material
Steel
Ball Material
Steel
Limiting Speed - Grease
18000 RPM
Seal Type
Non-Contact
Seal Material
Nitrile Rubber
Precision
ISO Class 0
Configuration
One
Factor
12.8
Radial Internal Clearance
C3
Static Load Rating
1030 lbf4600 N4.60 kN
Dynamic Load Rating
2160 lbf9600 N9.60 kN
Enclosure
Double Sealed
Weight
0.141 lb0.064 kg
Operating Temperature Range
-40 to 250 ºF-40 to 120 ºC
Dimensional Specifications
Single Row Radial Ball Bearing - Double Sealed (Non-Contact Rubber Seal) - Dimensions
d
0.6693 in17.000 mm
D
1.5748 in40.000 mm
B
0.4724 in12.000 mm
r
0.0236 in0.600 mm
r1
0.0197 in0.500 mm
da min
0.8268 in21.000 mm
da max
0.9055 in23.000 mm
Da max
1.4173 in36.000 mm
ras max
0.0236 in0.600 mm
Last edited by eightysixtuned; Dec 30, 2022 at 04:27 PM.
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2007 Mercedes E63 AMG
i found them on amazon since everywhere else needed bulk ordering. if i were to have ordered 10 or more bearings from an online retailer, pricing would have dropped the price for the bearings by half.
