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 verified
“7021” across 3 loaded brands
At least two brands share the same bore, outside diameter and width. Use Custom Compare when you want to choose exact suffix variants yourself.
Technical comparison
Choose exact variants instead →Brand differences at a glance
| 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 |
Automatic matching is a search aid, not an interchangeability declaration. Confirm the full suffix, tolerances, internal design and application limits before substitution.