Motor Starters vs. Contactors vs. Overload Relays: What Each One Does and Why You Need All Three
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Super-precision angular contact ball bearings, 110 x 170 x 28 mm, 15° contact angle, light preload, P4A class. Universally matchable pair.
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| MFR / Brand | SKF |
|---|---|
| MPN | 7022CDP4ADGA |
| Model | 7022CD/P4A DGA |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 110 mm (4.3307 in) |
| OD | 170 mm (6.6929 in) |
| Width | 28 mm |
| Material | Steel |
|---|---|
| Series | 7000 |
| Condition | New |
| Preload | Light |
| Base Number | 7022 |
| Industry Terms | super precision angular contact bearing, matched pair spindle bearing, machine tool bearing, P4A bearing, 15 degree angular contact, universally matchable set |
| Application Types | Machine tool spindles, grinding spindles, precision rotary tables |
| Total Width | 56 mm (2.2047 in) for the pair |
| Bore Shaft Size | 110 mm (4.3307 in) |
| Mpn Variants | 7022-CD/P4ADGA; 7022CDP4ADGA; 7022-CD-P4A-DGA; 7022CD/P4A DGA; 7022 CDGA/P4A; 7022CDGAP4A; 7022CD; 2MM9122WI |
| Arrangement Configuration | DGA - universally matchable set of two, light preload |
| Precision Class | P4A (SKF super-precision) |
| Min Temp | -30 °C |
| Cage Type | Not specified |
| Dynamic Load Rating | Cr 111 kN per bearing |
| Static Load Rating | C0r 108 kN per bearing |
| Precision Rating | P4A (SKF super-precision) |
| Rolling Elements | Steel balls, 19.05 mm diameter, 20 per bearing |
| Max Temp | 120 °C |
| Item Weight | 4.25 lbs (1.93 kg) per bearing |
| Cage Material | Non-metallic (SKF-published) |
| Number Of Rows | 1 per bearing |
| Bore Type | Straight |
| Snap Ring Included | Without Snap Ring |
| Internal Clearance | N/A - preloaded universally matchable set |
| Harmonization Code | 8482.10.50 |
| Contact Angle | 15° (degrees of arc) |
| Mounting Arrangement | Universally matchable set (DGA = light preload class) |
| Design Units | Metric |
| Bearing Material | Chrome bearing steel |
| Part Number | 7022-CD/P4ADGA |
| Cross Reference 1 | Fafnir 2MM9122WI |
|---|---|
| Cross Reference 2 | NSK 7022CTYNSULP4 (related size, polyamide cage) |
| Cross Reference 3 | GMN S6022CTA |
| Cross Reference 4 | 7022 CDGA/P4A (alternate SKF designation order, same bearing) |
SKF 7022-CD/P4ADGA super-precision angular contact ball bearings. Bore 110 mm, outside diameter 170 mm, width 28 mm per bearing. ISO 70 series, size 7022, straight bore, open both faces.
Contact Angle: 15°, from the SKF CD code. Design: high-capacity D execution. Precision Class: P4A. Preload Class: A, light, from the DGA suffix. Matching: universally matchable, so the pair mounts back-to-back, face-to-face or in tandem. Cage Material: non-metallic. Series: ISO 70. Base Number: 7022. Also catalogued as 7022 CDGA/P4A.
Dynamic Load Rating Cr: 111 kN. Static Load Rating C0r: 108 kN. Fatigue load limit Pu: 3.9 kN. Unmounted preload G0: 420 N. Axial stiffness: 122 N/µm. Ball diameter 19.05 mm, 20 balls. Effective load centre a: 32.9 mm. Mass: 1.93 kg. Grease reference quantity: 25.5 cm³.
A 15° contact angle favours speed and radial load over thrust, which is the usual front-position choice on a machine tool spindle. Light preload removes play at 122 N/µm of axial stiffness while keeping heat generation low. Universal matching means the two bearings arrive at that preload in any orientation with no spacer grinding. On this 70-series light section the static rating sits close to the dynamic rating, which is normal for the section.
Two bearings, universally matchable to light preload. Each carries the ratings above on its own; mounted as a pair they share load according to the arrangement chosen.
Shaft abutment diameter da and db: 119 mm minimum. Housing abutment diameter Da: 161 mm maximum, Db: 165 mm maximum. Housing fillet radius ra: 2 mm maximum, rb: 1 mm maximum. Oil-nozzle diameter dn: 132.6 mm.
Fafnir 2MM9122WI is the Timken cross on this envelope at the same 15° angle. GMN S6022CTA covers the same size. NSK 7022CTYNSULP4 shares the size and angle with a polyamide cage, so it is a related size.
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