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| Parameter | SKF6344 × 16 × 5 mm | FAG634>N4 × 16 × 5 mm | NSK6344 × 16 × 5 mm | KOYO6344 × 16 × 5 mm |
|---|---|---|---|---|
| Comparable specifications | ||||
| Brand | SKF | FAG | NSK | KOYO |
| Designation | 634 | 634>N | 634 | 634 |
| Product family | Deep groove ball bearings | — | Single row deep groove ball bearings | Extra-small, miniature ball bearings / Standard type / Open |
| Detailed type | Deep groove ball bearings | Deep groove ball bearings | Deep groove ball bearings | Deep groove ball bearings |
| Series | — | 634 | — | — |
| Bore diameterd | 4 mm | 4 mm | 4 mm | 4 mm |
| Outside diameterD | 16 mm | 16 mm | 16 mm | 16 mm |
| WidthB | 5 mm | 5 mm | 5 mm | 5 mm |
| Basic dynamic load ratingC | 1.11 kN | 1.84 kN | 1.91 kN | 1.7 kN |
| Basic static load ratingC0 | 0.38 kN | 0.67 kN | 0.67 kN | 0.52 kN |
| Fatigue load limitPu | 0.016 kN | 0.0415 kN | — | 0.01 kN |
| Reference speednref | 95000 r/min | 32500 r/min | — | — |
| Limiting speednG | 60000 r/min | 63000 r/min | — | 40000 r/min |
| Mass≈m | 0.005 kg | 0.006 kg | 0.00524 kg | 0.005 kg |
| Precision class | Normal | PN — Normal (ISO 492:2023) | — | — |
| Internal clearance | CN | CN (Group N) — Normal internal clearance | — | — |
| Sealing | Without | Without — Not sealed | Open | Open |
| Cage | Sheet metal | JN — Steel sheet metal | — | — |
| Bearing material | Bearing steel | — | — | — |
| Lubricant | None | Without — Bearing not greased | — | — |
| Minimum operating temperatureTmin | — | -30 °C | — | — |
| Maximum operating temperatureTmax | — | 120 °C | — | — |
| Boundary dimensions | ||||
| Bearing width (open)B | — | — | 5 mm | — |
| Minimum bearing chamferr min. | — | — | 0.3 mm | — |
| Calculation factors | ||||
| Calculation factorf0 | — | 12.4 | — | — |
| Capabilities & suitability | ||||
| Radial load capacity | — | Yes | — | — |
| Axial load capacity in one direction | — | Yes | — | — |
| Axial load capacity in both directions | — | Yes | — | — |
| Suitable for grease lubrication | — | Yes | — | — |
| Suitable for oil lubrication | — | Yes | — | — |
| Unsealed design | — | Yes | — | — |
| Classification | ||||
| Official Category Path | — | — | — | Deep groove ball bearings - Extra-small, miniature ball bearings - Standard type - Open |
| Official Classification 1 | — | — | — | Deep groove ball bearings / Extra-small, miniature ball bearings / Standard type / Open |
| Construction | ||||
| Catalogue closure construction | — | — | Open | — |
| Dimensions | ||||
| Minimum chamfer dimensionrmin | — | 0.3 mm | — | — |
| Minimum chamfer dimensionrmin | — | 0.012 in | — | — |
| Shoulder diameter outer ringD1 | — | 12.5 mm | — | — |
| Shoulder diameter outer ringD1 | — | 0.492 in | — | — |
| Caliber diameter outer ringD2 | — | 13.5 mm | — | — |
| Caliber diameter outer ringD2 | — | 0.531 in | — | — |
| Shoulder diameter inner ringd1 | — | 8.5 mm | — | — |
| Shoulder diameter inner ringd1 | — | 0.335 in | — | — |
| Caliber diameter inner ringd2 | — | 7.5 mm | — | — |
| Caliber diameter inner ringd2 | — | 0.295 in | — | — |
| Engineering — Abutment dimensions | ||||
| Diameter of shaft abutmentd a | min. 6.4 mm | — | — | — |
| Diameter of housing abutmentD a | max. 13.6 mm | — | — | — |
| Radius of shaft or housing filletr a | max. 0.3 mm | — | — | — |
| Engineering — Calculation data | ||||
| Minimum load factork r | 0.03 | — | — | — |
| Calculation factorf 0 | 8.4 | — | — | — |
| Engineering — Dimensions | ||||
| Deviation limits of mid-range bore diametert Δdmp | -0.008 to 0 mm | — | — | — |
| Deviation limits of mid-range outside diametert ΔDmp | -0.008 to 0 mm | — | — | — |
| Deviation limits of ring widtht ΔBs | -0.12 to 0 mm | — | — | — |
| Shoulder diameterd 1 | ≈ 8.4 mm | — | — | — |
| Recess diameterD 2 | ≈ 13.3 mm | — | — | — |
| Chamfer dimensionr 1,2 | min. 0.3 mm | — | — | — |
| ISO tolerance class for dimensions | Normal | — | — | — |
| Engineering — Tolerances of run-out | ||||
| Range of section height at inner ring of assembled bearingt Kia | 10 µm | — | — | — |
| Range of section height at outer ring of assembled bearingt Kea | 15 µm | — | — | — |
| ISO tolerance class for geometrical tolerances | Normal | — | — | — |
| Load ratings | ||||
| Basic dynamic radial load ratingCr | — | — | 1910 N | — |
| Basic static radial load ratingC0r | — | — | 670 N | — |
| Logistics | ||||
| Product net weight | 0.005 kg | — | — | — |
| eClass code | 23-05-08-01 | — | — | — |
| UNSPSC code | 31171504 | — | — | — |
| Lubrication-qualified speed | ||||
| Limiting speed with grease | — | — | 36000 r/min | — |
| Limiting speed with oil (open) | — | — | 43000 r/min | — |
| Main Dimensions & Performance Data | ||||
| Basic dynamic load rating, radialCr | — | 1,840 N | — | — |
| Basic dynamic load rating, radialCr | — | 413.669 lbf | — | — |
| Basic static load rating, radialC0r | — | 670 N | — | — |
| Basic static load rating, radialC0r | — | 150.629 lbf | — | — |
| Fatigue load limit, radialCur | — | 41.5 N | — | — |
| Fatigue load limit, radialCur | — | 9.33 lbf | — | — |
| Manufacturer Identity | ||||
| Schaeffler Product Code | — | 2587639 | — | — |
| Official Class Key | — | — | — | 010-020-010 |
| Base Type | — | 634 | — | — |
| Gpsd Group | — | S01 | — | — |
| Product Line Id | — | 14 | — | — |
| SAP material number | — | 0977862410000 | — | — |
| Base product | — | 2305080101 | — | — |
| Bearing X designation | — | 634 | — | — |
| Mounting Manager ID | — | 634 | — | — |
| Grease application ID | — | 634 | — | — |
| Mounting dimensions | ||||
| Minimum shaft shoulder diameter (open)da min. | — | — | 6 mm | — |
| Maximum adjacent fillet radiusra max. | — | — | 0.3 mm | — |
| Maximum housing shoulder diameter (open)Da max. | — | — | 14 mm | — |
| Minimum diameter shaft shoulderda min | — | 6.4 mm | — | — |
| Minimum diameter shaft shoulderda min | — | 0.252 in | — | — |
| Maximum diameter of housing shoulderDa max | — | 13.6 mm | — | — |
| Maximum diameter of housing shoulderDa max | — | 0.535 in | — | — |
| Maximum fillet radiusra max | — | 0.3 mm | — | — |
| Maximum fillet radiusra max | — | 0.012 in | — | — |
| Product characteristics | ||||
| Version code>N | — | Not marked on bearing | — | — |
| Type of SealWithout | — | Not sealed | — | — |
| Tolerance classPN | — | Normal (ISO 492:2023) | — | — |
| Dimensional / heat stabilizationSN | — | Rings dimensional stabilized up to 120° | — | — |
| Radial internal clearanceCN (Group N) | — | Normal internal clearance | — | — |
| Bore typeZ | — | Cylindrical | — | — |
| Product identity | ||||
| Official product category | Deep groove ball bearings | — | — | — |
| Official taxonomy path | /products/rolling-bearings/ball-bearings/deep-groove-ball-bearings | — | — | — |
| Structure group ID | BB1_001_101 | — | — | — |
| Available from SKF | Yes | — | — | — |
| Remanufacturable | No | — | — | — |
| Product Identity | ||||
| Construction | — | Deep groove ball bearing 63, single row, steel sheet metal cage | — | — |
| Short Description | — | Deep groove ball bearing | — | — |
| Properties | ||||
| Filling slots | Without | — | — | — |
| Number of rows | 1 | — | — | — |
| Locating feature, bearing outer ring | Without | — | — | — |
| Bore type | Cylindrical | — | — | — |
| Matched arrangement | No | — | — | — |
| Radial internal clearance | CN | — | — | — |
| Material, bearing | Bearing steel | — | — | — |
| Coating | Without | — | — | — |
| Relubrication feature | Without | — | — | — |
| Indicative carbon footprint for new product | 0.02 kg CO 2 e | — | — | — |
| Reference mass | ||||
| Approximate catalogue mass (open) | — | — | 5.24 g | — |
| Technical Data | ||||
| d | — | — | — | 16 mm |
| B | — | — | — | 5 mm |
| Bore Diameter (D) | — | 4 mm | — | — |
| R(Min.) | — | — | — | 0.3 mm |
| Outside Diameter (D) | — | 16 mm | — | — |
| Basic Load Ratings : Cr | — | — | — | 1.70 kN |
| Width (B) | — | 5 mm | — | — |
| Basic Load Ratings : C0R | — | — | — | 0.52 kN |
| Basic Dynamic Load Rating, Radial (Cr) | — | 1,840 N | — | — |
| Fatigue Load Limit : Cu | — | — | — | 0.010 kN |
| Basic Static Load Rating, Radial (C0R) | — | 670 N | — | — |
| Factor : F0 | — | — | — | 12.4 |
| Operating Temperature Min. (Tmin) | — | -30 °C | — | — |
| Limiting Speeds(Grease Lub.) | — | — | — | 40000 min-1 |
| Limiting Speed (Ng) | — | 63,000 1/min | — | — |
| Limiting Speeds(Oil Lub.) | — | — | — | 49000 min-1 |
| Operating Temperature Max. (Tmax) | — | 120 °C | — | — |
| Da(Min.) | — | — | — | 6 mm |
| Reference Speed (Nϑr) | — | 32,500 1/min | — | — |
| Da(Max.) | — | — | — | 14 mm |
| Calculation Factor (F0) | — | 12.4 | — | — |
| Ra(Max.) | — | — | — | 0.3 mm |
| Fatigue Load Limit, Radial (Cur) | — | 41.5 N | — | — |
| Mass(Refer.) | — | — | — | 5.3 g |
| Minimum Diameter Shaft Shoulder (Da Min) | — | 6.4 mm | — | — |
| Shoulder Diameter Inner Ring (D1) | — | 8.5 mm | — | — |
| Maximum Diameter Of Housing Shoulder (Da Max) | — | 13.6 mm | — | — |
| Minimum Chamfer Dimension (Rmin) | — | 0.3 mm | — | — |
| Caliber Diameter Inner Ring (D1) | — | 7.5 mm | — | — |
| Maximum Fillet Radius (Ra Max) | — | 0.3 mm | — | — |
| Shoulder Diameter Outer Ring (D1) | — | 12.5 mm | — | — |
| Caliber Diameter Outer Ring (D1) | — | 13.5 mm | — | — |
| Temperature range | ||||
| Operating temperature min.Tmin | — | -30 °C | — | — |
| Operating temperature min.Tmin | — | -22 °F | — | — |
| Operating temperature max.Tmax | — | 120 °C | — | — |
| Operating temperature max.Tmax | — | 248 °F | — | — |
Independent reference comparison based on the manufacturer data currently loaded. Always verify current limits, tolerances and suffix definitions with the official source before engineering selection.