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10 in stock
Matched pair of super-precision angular contact ball bearings, 20 x 42 x 12 mm each. 15° contact angle, light preload, ABEC 7, universally matchable.
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| MFR / Brand | SKF |
|---|---|
| MPN | 7004CDP4ADGA |
| GTIN | 7316576624834 |
| Model | 7004CD/P4A DGA 7004C |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 20 mm |
| OD | 42 mm |
| Width | 12 mm |
| Material | Bearing Steel |
|---|---|
| Series | 7000 |
| Condition | New |
| Lubricant | Oil |
| Preload | Light Preload |
| Abec | ABEC7 (ISO Class 4) |
| Base Number | 7004 |
| Industry Terms | spindle bearing pair; super precision angular contact; machine tool bearing; matched set bearing; light preload spindle bearing |
| Common Misspellings | 7004CD/P4A DGA; 7004-CDP4ADGA; SKF 7004CD/P4DGA; 7004CD P4A-DGA; 7004CDP4A/DGA |
| Application Types | Machine tool spindles; high-speed grinders; precision rotary axes; instrument spindles; small servo drives |
| Total Width | 24 mm stacked as a pair |
| Mounting Style | Dual Ground Flush |
| Radial Dynamic Load Capacity | 8.71 kN |
| Max Rpm | 56000 RPM |
| Radial Static Load Capacity | 4.3 kN |
| Bore Shaft Size | 20 mm (0.7874 in) |
| Mpn Variants | 7004 CD/P4ADGA; 7004CD/P4ADGA; 7004-CD-P4A-DGA; 7004CDP4ADGA; 7004CD |
| Arrangement Configuration | Matched pair, universally matchable at light preload (DB, DF or DT) |
| Precision Class | ABEC 7 / ISO P4A |
| Additional Attributes | 7004 ACD/P4ADGA is the 25 degree variant of this envelope and a separate part |
| Min Temp | -30 °C |
| Dynamic Load Rating | 8.71 kN / 1958 lbf |
| Static Load Rating | 4.3 kN / 967 lbf |
| Precision Rating | ABEC 7 / P4 |
| Rolling Elements | Ball |
| Max Temp | 120 °C |
| Item Weight | 0.31 lbs |
| Cage Material | Phenolic |
| Limiting Speed | 56000 rpm |
| Number Of Rows | 1 per bearing |
| Bore Type | Straight |
| Snap Ring Included | No |
| Harmonization Code | 8482.10.50.28 |
| Contact Angle | 15° |
| Mounting Arrangement | Universal |
| Design Units | Metric |
| Bearing Material | Chrome bearing steel |
| Part Number | 7004 CD/P4ADGA |
| Cross Reference 1 | NSK 7004CTRDULP4 |
|---|---|
| Cross Reference 2 | FAG B7004C.T.P4S.UL |
| Cross Reference 3 | Fafnir 2MM9104WI-DUL |
| Cross Reference 4 | RHP 7004CTDULP4 |
A matched pair of SKF 7004 CD/P4ADGA super-precision single-row angular contact ball bearings, each 20 mm bore by 42 mm outside diameter by 12 mm wide. The 7004 designation is the ISO 70-series thin-section angular contact envelope. These are small spindle bearings for machine tool spindles, high-speed grinders, precision rotary axes, dental and instrument spindles and small servo drives.
7004: single-row angular contact ball bearing, 20 x 42 x 12 mm.
CD: 15° contact angle in the SKF scheme.
P4A: ABEC 7 super-precision class.
DGA: supplied as a universally matchable set giving light preload.
The 15° contact angle is the high-speed end of the super-precision range. A shallower angle puts more of each ball’s load radially and less axially, which cuts heat generation and centrifugal loading at speed. Grinding spindles and high-rpm milling heads specify 15° for that reason. The trade-off is thrust capacity and axial stiffness, both lower than a 25° bearing of the same envelope.
Light preload works with that choice. Preload removes internal play and sets spindle stiffness, and light preload does so with the least frictional heat, which is what allows the pair to reach its speed limit. Medium and heavy preload buy stiffness at the cost of running temperature.
The DGA matching means the ring faces are ground so the two bearings sit at the tabulated light preload as soon as they are clamped up, in back-to-back, face-to-face or tandem arrangement, with no shim stack and no measurement at assembly. ABEC 7 holds bore, outside diameter and running accuracy to super-precision limits, which is what keeps spindle runout inside a few microns.
Bore: 20 mm.
Outside diameter: 42 mm.
Width: 12 mm per bearing.
Stacked width of the pair: 24 mm.
Rows: 1 per bearing.
Contact angle: 15°.
Precision class: ABEC 7 / ISO P4A.
Preload: light.
Closure: open.
Rolling elements: steel balls.
Arrangement: universally matchable, so the pair can be set back-to-back, face-to-face or in tandem. Back-to-back carries moment load and is the usual spindle configuration; face-to-face tolerates slight misalignment; tandem doubles thrust capacity in one direction.
Contact angle direction: identified by the high shoulder on the outer ring.
Two bearings ship as one matched pair, each with its own rings, ball complement and cage.
Genuine equivalents are 7004-envelope super-precision bearings at 15° with light preload and P4 class supplied as a matched pair, including NSK 7004CTRDULP4, FAG B7004C.T.P4S.UL, Fafnir 2MM9104WI-DUL and RHP 7004CTDULP4. The 7004 ACD/P4ADGA at 25° shares the envelope but is a different part, as are medium and heavy preload variants and anything at P0 or P5 class.
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