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| Parameter | SKF7021 CD/P4ADBA105 × 160 × 52 mm | NSK7021ADB105 × 160 × 52 mm | KOYO7021DB FY105 × 160 × 52 mm |
|---|---|---|---|
| Comparable specifications | |||
| Brand | SKF | NSK | KOYO |
| Designation | 7021 CD/P4ADBA | 7021ADB | 7021DB FY |
| Product family | Super-precision angular contact ball bearings | Angular contact ball bearing | Matched pair / Back-to-back / With machined cage |
| Detailed type | Matched set of two super-precision, high-capacity, d design, single row angular contact ball bearings | Angular contact ball bearings | Angular contact ball bearings |
| Bore diameterd | 105 mm | 105 mm | 105 mm |
| Outside diameterD | 160 mm | 160 mm | 160 mm |
| WidthB | 52 mm | 52 mm | 52 mm |
| Basic dynamic load ratingC | 156 kN | 143 kN | 162 kN |
| Basic static load ratingC0 | 193 kN | 163 kN | 164 kN |
| Fatigue load limitPu | 7.2 kN | — | 7.6 kN |
| Limiting speednG | — | — | 3500 r/min |
| Mass≈m | 3.12 kg | — | 3.46 kg |
| Sealing | Without | — | — |
| Cage | — | Machined brass, inner-ring guided | — |
| Bearing material | Bearing steel | — | — |
| Lubricant | None | — | — |
| Boundary dimensions | |||
| Individual bearing widthB | — | 26 mm | — |
| Minimum bearing chamferr min. | — | 2 mm | — |
| Nominal width of two-bearing assembly2B | — | 52 mm | — |
| Minimum secondary bearing chamferr1 min. | — | 1 mm | — |
| Classification | |||
| Official Category Path | — | — | Angular contact ball bearings - Matched pair - Back-to-back - With machined cage |
| Official Classification 1 | — | — | Angular contact ball bearings / Matched pair / Back-to-back / With machined cage |
| Construction | |||
| Nominal contact angleα | — | 30 ° | — |
| Standard cage code | — | M usually omitted | — |
| Optional cage codes — ratings require separate confirmation | — | T,TYN | — |
| Catalogue matching scope | — | DB, DF, DT | — |
| Cage material and construction | — | Machined brass, inner-ring guided | — |
| Construction / arrangement | — | Back-to-back matched pair | — |
| Dimensions | |||
| Contact angle | 15.0 ° | — | — |
| Engineering — Abutment dimensions | |||
| Diameter of shaft abutmentd a | min. 114 mm | — | — |
| Diameter of housing abutmentD b | max. 155 mm | — | — |
| Radius of filletr a | max. 2 mm | — | — |
| Radius of filletr b | max. 1 mm | — | — |
| Position of oil nozzled n | 125.6 mm | — | — |
| Engineering — Calculation data | |||
| Attainable speed for grease lubrication | To be calculated: Single bearing (8000) x speed reduction factor (see table below) | — | — |
| Attainable speed for oil-air lubrication | To be calculated: Single bearing (13000) x speed reduction factor (see table below) | — | — |
| Contact angleα | 15 ° | — | — |
| Ball diameterD w | 17.462 mm | — | — |
| Number of rowsi | 2 | — | — |
| Number of balls (per bearing)z | 21 | — | — |
| Reference grease quantity (per bearing)G ref | 20.4 cm³ | — | — |
| Engineering — Calculation data — Correction factors for preload calculation | |||
| Correction factor dependent on bearing series and sizef | 1.2 | — | — |
| Correction factor dependent on contact anglef 1 | 1 | — | — |
| Correction factor, preload class Af 2A | 1 | — | — |
| Correction factor for hybrid bearingsf HC | 1 | — | — |
| Engineering — Calculation data — Factors for equivalent bearing load calculation | |||
| Calculation factor for equivalent loadsf 0 | 15.7 | — | — |
| Additional factors for equivalent loads | Refer to Notes 1 and 2 below | — | — |
| Engineering — Calculation data — Preload and stiffness (back-to-back, face-to-face) | |||
| Preload class | A | — | — |
| PreloadG | 360 N | — | — |
| Axial stiffness | 117 N/µm | — | — |
| Engineering — Dimensions | |||
| Shoulder diameter of inner ring (large side face)d 1 | 121.9 mm | — | — |
| Chamfer dimensionr 1,2 | min. 2 mm | — | — |
| Chamfer dimensionr 3,4 | min. 1 mm | — | — |
| Engineering — Engineering specifications | |||
| Universal matching bearing(s) | No | — | — |
| Load-centre geometry | |||
| Single-bearing effective load centrea | — | 51.2 mm | — |
| Matched-pair load-centre spacinga0 (DB) | — | 102.5 mm | — |
| Logistics | |||
| Product net weight | 3.12 kg | — | — |
| eClass code | 23-05-08-04 | — | — |
| UNSPSC code | 31171531 | — | — |
| Lubrication-qualified speed | |||
| Limiting speed — grease | — | 3400 r/min | — |
| Limiting speed — oil | — | 4500 r/min | — |
| Manufacturer Identity | |||
| Official Class Key | — | — | 020-020-010 |
| Mass reference | |||
| Single-bearing approximate mass (not pair mass) | — | 1.84 kg | — |
| Matched-pair load ratings | |||
| Basic dynamic radial load ratingCr | — | 143000 N | — |
| Basic static radial load ratingC0r | — | 163000 N | — |
| Mounting dimensions — shown arrangement | |||
| Minimum shaft shoulder diameterda min. | — | 115 mm | — |
| Maximum housing shoulder diameterDb max. | — | 154 mm | — |
| Maximum shaft-side fillet radiusra max. | — | 2 mm | — |
| Performance | |||
| Note | Refer to catalogue data or contact SKF for the attainable speeds | — | — |
| Product identity | |||
| Official product category | Super-precision angular contact ball bearings | — | — |
| Official taxonomy path | /products/super-precision-bearings/angular-contact-ball-bearings | — | — |
| Structure group ID | BA1_010 | — | — |
| Available from SKF | Yes | — | — |
| Remanufacturable | No | — | — |
| Properties | |||
| Contact type | Normal contact (two-point contact) | — | — |
| Number of rows | 2 | — | — |
| Ring type | One-piece inner and outer rings | — | — |
| Design | High-capacity D | — | — |
| Universal matching bearing | No | — | — |
| Matched arrangement | Back-to-back <> | — | — |
| Number of bearings in matched set | 2 | — | — |
| Matched condition (axial clearance/ preload) | Extra light preload | — | — |
| Tolerance class | P4A | — | — |
| Material, bearing | Bearing steel | — | — |
| Coating | Without | — | — |
| Indicative carbon footprint for new product | 11.5 kg CO 2 e | — | — |
| Technical Data | |||
| d | — | — | 160 mm |
| B | — | — | 52 mm |
| R(Min.) | — | — | 2 mm |
| R1(Min.) | — | — | 1 mm |
| Basic Load Ratings : Cr | — | — | 162 kN |
| Basic Load Ratings : C0R | — | — | 164 kN |
| Fatigue Load Limit : Cu | — | — | 7.60 kN |
| Limiting Speeds(Grease Lub.) | — | — | 3500 min-1 |
| Limiting Speeds(Oil Lub.) | — | — | 4400 min-1 |
| Load Center Spread : A | — | — | 103.7 mm |
| Da(Min.) | — | — | 115 mm |
| Db(Max.) | — | — | 154.5 mm |
| Ra(Max.) | — | — | 2 mm |
| Rb(Max.) | — | — | 1 mm |
| Mass(Refer.) | — | — | 3.46 kg |
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.