Enduro Bearings Deep Groove Ball Bearings - 61903 17 mm x 30 mm x 7 mm

Item number: 57528

excl. shipping cost
to the delivery destination: USA

universal/type 1
in stock

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High-end product among the steel bearings: the 61903 SRS ABEC 5 by Enduro Bearings

To meet the ABEC 5 standard, bearing design must pass all tests, which include noise testing at high RPM, extremely close tolerances for I.D. and O.D., roundness of ball, trueness of the races and micro surface finishes of balls and races.
ABEC 5 bearings by Enduro Bearings come with high precision balls that are within 5/1,000,000" round. These are military level specification, used for precision equipment. R-64 hardness, of the highest grade. Vacuum de-gassing process for the purest chromium alloy steel, hardened to R62, extremely tough and very durable. Nylon with graphite retainers are virtually frictionless while providing constant lubrication with Rheolube 374A grease.


Dimensions (Inner x Outer x Width): 17 mm x 30 mm x 7 mm
Designation: 61903


Type 1:
Design: deep groove ball bearing
Tolerance: ABEC 5
Recommended Use: hubs
Inner Race Material: steel (52100)
Outer Race Material: steel (52100)
Ball Material: steel
Seal: SRS
Static Capacity: 2.1 kN (477 lbs)
Manufacturer Part Number: 61903SRS


- ranked ABEC 5 by Annular Bearing Engineer's Committee for manufacturing tolerances and noise testing
- grade 5 chromium steel balls = 5/1,000,000" tolerance of sphericity
- 52100 high carbon chromium alloy races with heat treatment followed by cryogenic treatment (310° Fahrenheit (-190° C)), hardened to at least Rockwell HRC 62, polished to a mirror finish for precision and noiseless movement
- nylon with graphite retainer, both sides filled with grease
- SRS: seal with a snap ring that can be removed with no danger for quick and easy servicing, single sealing lip makes contact on a step machined into the inner race, extremely low rolling resistance and speed, while being an effective barrier against dirt and water
- C3 internal clearance


- 1 x Enduro Bearings 61903 17 mm x 30 mm x 7 mm ball bearing


  • universal/type 1: 15,9 g


in stock 2 to 7 days up to 10 days up to 20 days inform me
  • universal/type 1

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