SKF 7028 CDGB/P4A angular contact ball bearing
- Brand
- SKF
- Category
- Bearings
- Subcategory
- Angular contact ball bearings
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Decoding SKF 7028 CDGB/P4A
- 70Series
- Angular contact ball bearings, 70 series. Series differ in outside diameter and width even when the bore is the same.
- 28Bore
- Bore 140 mm (28 × 5).
- CDGB/P4ASuffix
- SKF suffix: identifies the variant, such as seals or shields, cage, internal clearance or other features.
7028 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
SKF 7028 CDGB/P4A belongs to angular contact ball bearing, part of our Bearings range. Tell us how many you need by WhatsApp or email and we'll get back to you promptly with a quote for 7028 CDGB/P4A and any equivalents.
The CDGB/P4A line from SKF covers angular contact bearings built to hold combined radial and axial loads acting in a single direction. The angled raceway-to-ball contact is what gives these bearings their greater capacity for axial forces. Machine tool spindles, metrology instruments and similar equipment that depends on rigidity and rotational accuracy are typical homes for this series. MR Industrial Accessories supplies this line within its precision bearing range.
Reading the part number is the first step in choosing correctly. Take 7016 CDGB/P4A: the basic number (7016, and likewise 7005, 7008 or 7010) fixes the size and series, while the suffix carries the performance data. CD describes the internal design and contact angle, GB sets the axial clearance or preload, and P4A marks the precision class, meaning very tight dimensional and running tolerances. Decoding those letters before ordering avoids mismatches on the spindle.
Where do these bearings earn their place? Milling, grinding and machining center spindles, rotary tables, positioning systems and measuring equipment all rely on them. Automotive, aerospace and precision machinery operations use them regularly for that reason. Combined load support plus running accuracy at speed is the combination that makes them suitable for these duties.
Selection starts with the arrangement. Angular contact bearings normally run in pairs, mounted face-to-face or in tandem, so that axial loads from either direction are covered. The GB preload influences both rigidity and service life, so it should match the application. Lubrication and sealing matter as well: high-speed operation generally calls for oil lubrication together with low-friction seals. Supports must also be aligned precisely, since misalignment introduces extra loads. Manufacturer instructions govern mounting and preload setting.
On equivalences, precision angular contact bearings are produced to standards such as ISO or ABMA, and several brands offer comparable products. Suffixes and precision classes differ from one maker to another, though. SKF's P4A class sits alongside other precision classes but is not automatically a drop-in swap until dimensions and tolerances are checked. Compatibility tables and technical specifications should be reviewed before any replacement.
If you are sourcing an SKF angular contact bearing from the CDGB/P4A series, MR Industrial Accessories can assist. Send the complete part number by WhatsApp or email and the team will reply promptly with a quote, suggest equivalents and help you choose the right bearing for the application.
Dimensions
- Bore
- 140mm
Frequently asked questions
- What does the suffix CDGB/P4A mean in an SKF bearing?
- CD covers the contact angle and internal design, GB the axial clearance or preload, and P4A the precision class with very tight dimensional and running tolerances. Together they define a high-accuracy bearing for demanding work.
- Can these bearings be mounted individually?
- Pairs or sets are the usual arrangement, since that is how axial loads in both directions get handled. Running one on its own is possible, but axial capacity is limited. A specialist can help define the right arrangement.
- How are precision angular contact bearings lubricated?
- High-quality oil or grease, chosen according to speed and temperature. At high speeds, oil with circulation or mist systems is preferred. Follow the manufacturer's guidance on lubricant type and quantity.