ABEC 3 bearings from PQB Bearings feature 10th-degree chrome steel balls that are twice as round as the industry standard, and manufactured to the highest standard. The treads are made of a 52100 carbon chrome steel alloy that is vacuum-generated and then hardened for extra strength and durability. A high-gloss polish ensures precision and low noise.
PQB full bearings are characterised by a 35 to 40 % higher load capacity than standard radial bearings. For 20 years PQB Bearings has been manufacturing them specifically for use on mountain bike shocks. As its name indicates, Full bearings are fitted with the maximum possible number of balls. The grooves in the races are deeper to accommodate the multiple lateral turning forces at the MTB rear pivot.
This is a High Quality ball bearing - Deep Groove - Radial Bearing 6903 ZZ ABEC 3 (17 x 30 x 7mm) ABEC 3 rate Designed to use for markets bearing, transmissions, gearboxes, belts, chain and related products, and offers a spectrum of powertrain rebuild and repair services.
| Bearing Type | Ball |
| For Load Direction | Radial |
| Construction | Single Row |
| Seal Type | Sealed |
| Part Number | 6903ZZ |
| For Shaft Diameter | 17mm |
| Bore Dia (d) | 17mm |
| Bore Dia Tolerance | -0.008mm to 0 |
| For Housing ID | 30mm |
| Outer Dia (D) | 30mm |
| Outer Dia Tolerance | -0.008mm to 0 |
| Width (B) | 7mm |
| Width Tolerance | -0.12mm to 0 |
| Ring Material | 52100 Chrome steel |
| Ball Material | 52100 Chrome steel |
| Cage Material | 300 Series Stainless Steel |
| Shield Material | 300 Series Stainless Steel |
| Dynamic Load Rating (Cr) (Newtons) | 4590 |
| Static Load Rating (Cor) (Newtons) | 2560 |
| Max Speed (Grease) (X1000 RPM) | 22 |
| Max Speed (Oil) (X1000 RPM) | 26 |
| Lubrication | Required |
| Shaft Mount Type | Press Fit |
| Temperature Range | -30° to 110 °C |
| ABEC Rating | ABEC-3 |
| Radial Clearance Trade No. | C0 |
| Radial Clearance | 0.003mm to 0.018mm |
| RoHS | Compliant |
| Ball Qty | 111 |
| Ball Dia | 3.969mm |
| Weight (grams) | 20 |
1 Applicable only for open, single Z, ZZ, single RU and 2RU types in inner ring rotating conditions. Max. speeds for the contact rubber seal(s) types will be around 50-60 % of above values.
2 Applicable only for open, single Z, ZZ, single RU and 2RU types in inner ring rotating conditions. Max. speeds for the contact rubber seal(s) types will be around 50-60 % of above values.
What does radial and axial load capacity mean?
Info sheet ball bearing
Information about ball bearing seals
Internal clearance and operating clearance
Comparison list of roller bearings
Comparison of features of roller bearings
How do I clean my bearings?
How do I grease or oil my bearings?
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