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When a standard bearing slips axially or lacks a positive seating surface, the result is vibration, misalignment, and premature wear. Engineers, hobbyists, and repair technicians who work with compact rotating assemblies need a flanged ball bearing that locks positively into a housing bore without additional retaining hardware. These metal shielded flanged deep groove ball bearings deliver exactly that — a rigid flange shoulder that seats flush against the housing face, eliminating axial float in one step.
Each flanged ball bearing features a stamped steel flange integrated with a deep groove raceway, enclosed by dual metal shields on both sides. Inner diameter options span 2 mm (0.079 in) through 10 mm (0.394 in), with a long-body 4mm【L】variant for applications requiring additional axial depth. The outer diameter and width vary by bore size; refer to the variant options for exact dimensional pairing. The steel raceway and cage are pre-lubricated with grease suitable for moderate-speed, moderate-load duty cycles.
Typical use cases include RC car wheel hubs and drivetrain pivots, 3D printer extruder idlers and carriage rails, small DC motor end caps, CNC router spindle supports, and DIY robotics joint assemblies — anywhere a flanged deep groove ball bearing must resist both radial loads and light axial thrust while fitting a compact bore.
| Bearing Type | Deep Groove Flanged Ball Bearing |
|---|---|
| Shield Type | Dual Metal Shields (both sides) |
| Inner Diameter (Bore) | 2 / 3 / 4 / 5 / 6 / 8 / 10mm — see variant options; 4mm【L】= extended width |
| Outer Diameter | See variant options |
| Bearing Width | See variant options |
| Flange Outer Diameter | See variant options |
| Material — Rings & Shields | Steel |
| Cage Material | Steel |
| Lubrication | Pre-greased (general-purpose grease) |
| Load Direction | Radial + light axial (both directions) |
| Operating Temperature | Typically −10°C to +120°C (14°F to 248°F) |
| Packing Quantity | 1 pcs / 5 pcs / 10 pcs — see variant options |
| Dimensional Standard | Metric |
Measure your shaft diameter with a caliper to the nearest 0.1mm. The bearing inner diameter should match the shaft diameter exactly for a proper interference or transition fit. For example, a 5mm shaft requires the 5mm bore variant. If your shaft is between standard sizes, select the next smaller bore and lightly ream or sand the shaft for a precise fit rather than using an oversized bearing.
The 4mm【L】variant shares the same 4mm inner diameter but has an extended outer ring width (greater axial depth). This makes it suitable for housings that require a longer bearing seat — common in certain motor end caps and gearbox designs. Confirm your housing depth before ordering to ensure the longer body fits without bottoming out.
These bearings use steel rings and shields, which offer moderate corrosion resistance when the factory grease is intact. For consistently humid, wet, or salt-spray environments, consider stainless steel bearings instead. In typical indoor or intermittently damp conditions (RC cars, workshop equipment), the metal shields and grease provide adequate protection for normal service life.
Yes, the deep groove raceway design supports light-to-moderate axial loads in both directions in addition to radial loads. However, these are not dedicated thrust bearings. For applications where axial load is the dominant force — such as a vertical shaft carrying significant weight — a dedicated thrust bearing or angular contact bearing is more appropriate. For combined radial + light axial duty (typical in RC drivetrains, 3D printer carriages, and small motors), these flanged bearings are well suited.
No. Each bearing is pre-greased at the factory and ready to install. Avoid washing out the factory grease with solvents before installation. If the bearing will operate at elevated temperatures or in a high-speed application beyond typical hobby use, you may re-grease with a compatible bearing grease after removing the shields — but for most standard applications, the factory fill is sufficient for the bearing's service life.
Choose the 1-piece pack for a single replacement or to test fitment before committing to a larger quantity. The 5-piece pack suits small builds or projects requiring multiple bearings of the same size (e.g., a 3D printer with 4–6 idler positions). The 10-piece pack offers the best per-unit value for production runs, stocking a workshop, or building multiple units of the same design. All packs contain identical bearings — only the quantity differs.
These bearings are widely used in RC car wheel hubs, steering knuckles, and drivetrain pivots; 3D printer extruder idlers, belt tensioners, and carriage linear guides; small DC and brushless motor end caps; CNC router spindle supports; DIY robotics joint assemblies; and general precision machinery where a compact metric bore flanged bearing is required. The flange shoulder makes them especially useful wherever a positive axial stop is needed without additional hardware.
