Cross-brand designation analysis
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Same-model Comparison
Explore products that share a base designation across loaded brands, with dimensional agreement and data gaps shown clearly.
Automatic candidate selection
One base designation across loaded brands
Exact designations rank first. Dimensions, suffixes and other technical differences remain visible so the result is not mistaken for an interchangeability declaration.
Dimensions differ
“639” across 4 loaded brands
The base designation is shared, but the loaded boundary dimensions do not agree. Use Custom Compare when you want to choose exact suffix variants yourself.
Technical comparison
Choose exact variants instead →Brand differences at a glance
| 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 | — | — |
Automatic matching is a search aid, not an interchangeability declaration. Confirm the full suffix, tolerances, internal design and application limits before substitution.