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| Parameter | SKF639/3-2Z3 × 8 × 4 mm | TIMKEN639 / 63263.5 × 136.525 × 41.275 mm | NSK6399 × 30 × 10 mm | KOYO6399 × 30 × 10 mm |
|---|---|---|---|---|
| Comparable specifications | ||||
| Brand | SKF | TIMKEN | NSK | KOYO |
| Designation | 639/3-2Z | 639 / 632 | 639 | 639 |
| Product family | Deep groove ball bearings | TS - Tapered Single | Single row deep groove ball bearings | Extra-small, miniature ball bearings / Standard type / Open |
| Detailed type | Deep groove ball bearing with seals or shields | Tapered roller bearings | Deep groove ball bearings | Deep groove ball bearings |
| Series | — | 635 | — | — |
| Bore diameterd | 3 mm | 63.5 mm | 9 mm | 9 mm |
| Outside diameterD | 8 mm | 136.525 mm | 30 mm | 30 mm |
| WidthB | 4 mm | 41.275 mm | 10 mm | 10 mm |
| Basic dynamic load ratingC | 0.364 kN | 276 kN | 5.6 kN | 7.5 kN |
| Basic static load ratingC0 | 0.093 kN | 298 kN | 2.39 kN | 2.65 kN |
| Fatigue load limitPu | — | — | — | 0.21 kN |
| Reference speednref | 150000 r/min | — | — | — |
| Limiting speednG | 75000 r/min | — | — | 24000 r/min |
| Mass≈m | 0.0008 kg | 2.84 kg | 0.0365 kg | 0.035 kg |
| Precision class | — | ABMA Class 2 | — | — |
| Internal clearance | CN | — | — | — |
| Sealing | Shield on both sides | Open | Open | Open |
| Cage | — | Steel cage | — | — |
| Bearing material | Bearing steel | — | — | — |
| Lubricant | Grease | — | — | — |
| Boundary dimensions | ||||
| Bearing width (open)B | — | — | 10 mm | — |
| Minimum bearing chamferr min. | — | — | 0.6 mm | — |
| Calculation Factors | ||||
| K Factor | — | 1.61 | — | — |
| Y1 Factor | — | 1.66 | — | — |
| Y2 Factor | — | 0.00 | — | — |
| Y0 Factor | — | 0.91 | — | — |
| E Factor | — | 0.36 | — | — |
| Cg Factor | — | 0.0814 | — | — |
| 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 | — |
| Load ratings | ||||
| Basic dynamic radial load ratingCr | — | — | 5600 N | — |
| Basic static radial load ratingC0r | — | — | 2390 N | — |
| Logistics | ||||
| Product net weight | 0.0008 kg | — | — | — |
| eClass code | 23-05-08-01 | — | — | — |
| UNSPSC code | 31171504 | — | — | — |
| Lubrication-qualified speed | ||||
| Limiting speed with grease | — | — | 24000 r/min | — |
| Limiting speed with oil (open) | — | — | 30000 r/min | — |
| Manufacturer Identity | ||||
| Material Number | — | 000000000100034316 | — | — |
| Official Class Key | — | — | — | 010-020-010 |
| World Assembly Part Number | — | 639_632 | — | — |
| Inner Ring Part Number | — | 639 | — | — |
| Outer Ring Part Number | — | 632 | — | — |
| Drawing Number | — | A-3822 | — | — |
| Upc | — | 0053893712833 | — | — |
| Official Source System | — | CORE BP - DS DF | — | — |
| Official Last Run | — | 2026-08-23T20:02:46.73 | — | — |
| Mounting dimensions | ||||
| Minimum shaft shoulder diameter (open)da min. | — | — | 13 mm | — |
| Maximum adjacent fillet radiusra max. | — | — | 0.6 mm | — |
| Maximum housing shoulder diameter (open)Da max. | — | — | 26 mm | — |
| 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 | ||||
| Type Description | — | TS - Tapered Single | — | — |
| Construction | — | Single Row Tapered Roller Bearing Assembly | Imperial Series | 2.5000 in Bore | 5.3750 in OD | 1.6250 in Width | Open | Cylindrical Bore | Steel Cage | Precision ABMA Class 2 | — | — |
| Number Of Rows | 1 | 1 | — | — |
| Tapered Bore | — | N | — | — |
| Properties | ||||
| Filling slots | Without | — | — | — |
| Locating feature, bearing outer ring | Without | — | — | — |
| Bore type | Cylindrical | — | — | — |
| Matched arrangement | No | — | — | — |
| Radial internal clearance | CN | — | — | — |
| Material, bearing | Bearing steel | — | — | — |
| Coating | Without | — | — | — |
| Sealing type | Non-contact | — | — | — |
| Relubrication feature | Without | — | — | — |
| Indicative carbon footprint for new product | 0.003 kg CO 2 e | — | — | — |
| Reference mass | ||||
| Approximate catalogue mass (open) | — | — | 36.5 g | — |
| Technical Data | ||||
| d | — | — | — | 30 mm |
| B | — | — | — | 10 mm |
| R(Min.) | — | — | — | 0.6 mm |
| Basic Load Ratings : Cr | — | — | — | 7.50 kN |
| Overall Width | — | 47.575 mm | — | — |
| Basic Load Ratings : C0R | — | — | — | 2.65 kN |
| Radial Rating | — | 71,600 N | — | — |
| Fatigue Load Limit : Cu | — | — | — | 0.210 kN |
| Axial Rating | — | 44,400 N | — | — |
| Factor : F0 | — | — | — | 12.3 |
| Dynamic Rating C1 | — | 276,000 N | — | — |
| Limiting Speeds(Grease Lub.) | — | — | — | 24000 min-1 |
| Dynamic Rating C90 | — | 71,600 N | — | — |
| Limiting Speeds(Oil Lub.) | — | — | — | 29000 min-1 |
| Dynamic Axial Rating Ca90 | — | 44,400 N | — | — |
| Da(Min.) | — | — | — | 13 mm |
| Dynamic Axial Rating Ca1 | — | 171,000 N | — | — |
| Da(Max.) | — | — | — | 26 mm |
| Static Radial Rating C0 | — | 298,000 N | — | — |
| Ra(Max.) | — | — | — | 0.6 mm |
| Extended Dynamic Rating Ce | — | 0 N | — | — |
| Mass(Refer.) | — | — | — | 35 g |
| Static Axial Rating C0A | — | 314,000 N | — | — |
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.