Single row deep groove ball bearings are compact, non-separable bearings widely used in motors, pumps, gearboxes, fans, conveyors, and general industrial equipment. Although the basic bearing number defines the main size series, buyers still need to confirm the exact design required for the application.
This article focuses on the main purchasing checks for single-row designs, including seals or shields, snap ring features, internal clearance, shaft and housing fit, lubrication, and speed requirements. Buyers should retain the complete designation because these options can affect friction, temperature, contamination protection, mounting, and operating performance.
A single row deep groove ball bearing has one row of balls running in deep raceway grooves. It primarily carries radial load and can also support axial load in both directions within the limits of the selected design. Its simple construction supports low friction and relatively high speed.
Manufacturers assemble the rings, cage, and balls as one non-separable unit. By contrast, a double-row deep groove bearing uses different internal geometry and normally has different width and capacity. In addition, this single-row design offers limited misalignment capability, so the shaft and housing still require accurate alignment.
The enclosure and locating features create distinct procurement groups.
| Configuration | Main feature | Procurement check |
| Open | No integral shield or seal | External sealing, lubricant supply, cleanliness, and speed |
| Metal shield | Low-contact protection against larger contaminants | Shield code, grease, temperature, and contamination level |
| Non-contact seal | Improved protection with limited seal friction | Exact seal code, speed, dust, and moisture |
| Contact seal | Stronger exclusion and grease retention | Seal drag, temperature, speed, and compatibility |
| Snap ring groove | Groove in the outer ring for axial location | Groove and ring suffix, housing shoulder, and ring supply |
Common dimensional families include 60, 62, 63, and 64 series. Thin-section 68 and 69 series use a smaller cross-section for constrained envelopes. The same bore can therefore appear in several outside diameters and widths.
Single row deep groove ball bearings are widely used in electric motors, pumps, blowers, gearboxes, agricultural machinery, material-handling systems, and machine tools. They are also common in household and commercial equipment. Application priorities vary by machine. Electric motors and fans usually require low vibration, controlled noise, and stable operation at speed. Pumps, conveyors, and agricultural equipment place more emphasis on grease retention and protection against moisture or dust. Gearboxes and machine tools require closer review of fit, running clearance, temperature, and rotational accuracy.
Sealed or shielded variants support grease retention and contamination control. By contrast, open bearings allow the machine to use a separate lubrication system. Before selection, buyers should check radial and axial loads, speed, duty cycle, temperature, shaft orientation, and contamination levels. They should also review lubricant life, noise requirements, and mounting conditions. If the application involves heavy axial loads, severe shock, or significant misalignment, buyers should consider another bearing type.
First, confirm the bore, outside diameter, width, chamfer, shoulder dimensions, and available housing space. Then compare load ratings and permissible speed for the exact bearing design. Contact seals create extra friction, so sealed versions may run at lower speeds than open or shielded designs.
Fit directly affects operating clearance and temperature. Interference on the shaft or in the housing expands or compresses a ring, while a temperature difference between the rings may reduce clearance further. Buyers should therefore select the initial clearance only after reviewing both fits and expected operating temperatures. For snap-ring versions, confirm the groove position, ring size, load direction, and shoulder geometry. Do not assume that the snap ring can support every axial load condition.
Also confirm the grease type, fill quantity, relubrication strategy, and compatibility with the expected speed and temperature. A seal selected for contamination control may add drag and heat, so buyers should evaluate the enclosure and lubricant together.
Store the bearing in its packaging until installation. Clean the shaft, housing, shoulders, and tools. Apply force only to the ring with the interference fit and do not transmit force through the balls. Use controlled heating when approved, and keep sealed bearings away from excessive temperature.
After mounting, verify axial seating, smooth rotation, seal condition, grease arrangement, and absence of preload caused by incorrect shoulders or cover plates. For removal, use a puller or induction equipment suited to the fit and avoid gripping shields or seals.
Brand suffixes are not universal, even when the basic dimensions match.
| Brand | Series examples | Complete model example |
| NTN | 60, 62, 63, 64, 68, and 69 series; ZZ, LLB, LLH, LLU, N, and NR options | 6205ZZC3/2AS |
| SKF | 60, 62, 63, 64, 618, and 619 series; open, shielded, sealed, and snap-ring designs | 6205-2RSH/C3 |
| NSK | 60, 62, 63, 64, 68, and 69 series; open, shielded, sealed, and C3 variants | 6205DDUC3 |
These are identification examples, not automatic equivalents. Compare enclosure, grease, clearance, cage, tolerance, speed, load rating, snap ring, temperature, and noise requirements.
The NTN bearing number 6205ZZC3/2AS can be divided into several sections that indicate the bearing type, size, sealing arrangement, internal clearance, and grease specification.
| Code | Code section | Meaning |
| 6 | Bearing type | Deep groove ball bearing |
| 2 | Diameter series | Diameter series 2 |
| 05 | Bore code | Nominal bore diameter: 25 mm |
| ZZ | Shield type | Double-sided steel shields |
| C3 | Internal clearance | Radial internal clearance C3 |
| /2AS | Grease specification | Alvania Grease S2 |
The complete bearing number is important because each code section identifies a specific design feature, and missing or incorrect suffixes can lead to the wrong bearing specification or replacement.
HSN reviews the complete bearing reference, brand, dimensions, enclosure, internal clearance, cage, fit, lubrication, speed, load, temperature, quantity, application, and working conditions. The team checks stock and delivery against the exact model rather than the basic bearing number alone. For replacement inquiries, HSN compares each relevant parameter before discussing suitability.
Before shipment, HSN checks dimensional tolerances, hardness, and internal clearance according to the agreed inspection plan. When required, buyers can also request checks for rotation accuracy, vibration, noise, material, or flaw detection. Photos, drawings, packaging details, and inspection documents can be confirmed with the order requirements.
Are open, shielded, and sealed versions interchangeable?
Not automatically. They differ in protection, friction, speed capability, lubrication, and sometimes width or internal execution.
What does LLU mean in the NTN example?
LLU identifies contact rubber seals on both sides of this NTN bearing.
Does a 6205 code always mean the same product?
It generally identifies the same nominal boundary dimensions, but suffixes and brand-specific ratings or features still require comparison.
What should a buyer provide for confirmation?
Send the full model, brand, dimensions, photos, quantity, load, speed, enclosure, clearance, lubricant, and operating environment.
For detailed single row deep groove ball bearing models beyond those listed above, or for other bearing types, contact HSN with the complete reference and technical requirements.
This article is based on independent analysis of publicly available technical information and industry understanding for knowledge sharing. All brand names and trademarks belong to their respective owners. HSN Bearing Group is an independent bearing supplier and technical service provider.
Tel: +86 156 6578 7336 Email: service@hsnindustrial.com Website: www.rollingparts.com www.hsnbearings.com