SKF 6311-2Z/C3GE2 deep groove ball bearing
- Brand
- SKF
- Category
- Bearings
- Subcategory
- Deep groove ball bearings
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Decoding SKF 6311-2Z/C3GE2
- 63Series
- Deep groove ball bearings, 63 series. Series differ in outside diameter and width even when the bore is the same.
- 11Bore
- Bore 55 mm (11 × 5).
- 2Z/C3GE2Suffix
- SKF suffix: identifies the variant, such as seals or shields, cage, internal clearance or other features.
6311 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
SKF 6311-2Z/C3GE2 measures 55 mm across the bore and 120 mm across the outside diameter; its width is 29 mm (55 x 120 x 29 mm).
SKF 6311-2Z/C3GE2 belongs to deep groove 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 6311-2Z/C3GE2 and any equivalents.
The 63 series from SKF is a medium-section deep groove ball bearing built to carry radial and axial loads in either direction. Its construction suits high-speed operation, which is why it turns up so often in electric motors, pumps, fans and general industrial machinery. MR Industrial Accessories supplies this line and can walk you through the variant that fits your equipment.
Reading the code takes a moment but pays off. Take 6311: the first digit tells you the type, a deep groove ball bearing, and the 3 places it in the 63 series, the medium section. What follows the basic number describes how the bearing is built. A 2Z suffix means a metal shield sits on each side. C3 signals internal radial clearance wider than the standard value, which suits hot running conditions or interference fits. GE2 identifies the grease filled at the factory. Put together, a 6314-2Z/C3GE2 is a 63 series bearing with shields, C3 clearance and that specific lubricant.
You will find these bearings across a broad range of plant equipment: electric motors, gearboxes, centrifugal pumps, fans, compressors, conveyor lines and machine tools. They handle combined loads and run at high speed, so they fit many positions. Food processing, textile, petrochemical and steel operations rely on them in production lines where stopping is not an option. Because the 63 series is medium-section, it balances load capacity against the space it takes up.
Selection comes down to a few inputs: radial load, axial load, rotational speed and the surrounding environment. The 2Z shields keep out dust and dirt but are not meant for liquid exposure, so choose a contact seal where moisture or splash is present. C3 clearance makes sense with tight fits or thermal gradients across the assembly. At mounting, check that shaft and housing are properly aligned and apply the correct lubricant. Misalignment is a common cause of shortened service life, so follow the mounting and fixing instructions from the manufacturer.
Interchange is possible with deep groove ball bearings of similar series from other makers, but confirm dimensions and tolerances first. Suffix conventions differ: the 2Z you see here may appear as ZZ elsewhere. Do not go by the part number alone; line up the technical data. If anything is unclear, ask us and we will point you to a suitable replacement.
Send the full part number by WhatsApp or email and the team at MR Industrial Accessories will come back to you promptly with an option. Unsure about the designation? A photo or the equipment data is enough for us to help you choose.
Dimensions
55 x 120 x 29 mm (d x D x B): boundary dimensions for basic designation 6311, according to ISO 15.
- Bore
- 55mm
- Outside diameter (D)
- 120mm
- Width (B)
- 29mm
Same size, other brands
Other brands' pages with basic designation 6311: 55 x 120 x 29 mm (d x D x B) per ISO 15.
- FAG6311-C-2Z6311-C6311-C-2HRS
- KOYO6311
- NSK6311 ZZ6311
- NTN6311ZZ63116311LLB1 more →
- RKB6311
- TIMKEN63116311MB
What they share are the ISO 15 boundary dimensions, not the specs: seals or shields, internal clearance, cage and load rating may vary with brand and suffix. Every quote is by full part number.
Frequently asked questions
- SKF 6311-2Z/C3GE2 bearing: what are its dimensions?
- SKF 6311-2Z/C3GE2 measures 55 mm across the bore and 120 mm across the outside diameter; its width is 29 mm (55 x 120 x 29 mm). Those are the boundary dimensions standardized in ISO 15 for basic designation 6311.
- What does the C3 suffix mean on an SKF bearing?
- C3 marks an internal radial clearance wider than the standard value. It is specified for bearings that run hot or are mounted with interference fits, so expansion does not create excessive preload.
- How do 2Z and 2RS differ?
- 2Z uses metal shields, which hold grease in and block larger particles. 2RS uses rubber contact seals, giving better protection against fine dust and moisture at the cost of higher friction.
- Can I replace an SKF bearing with one from another brand?
- Often yes, provided the bore, outer diameter, width, sealing arrangement, internal clearance and load capacity match. Numbering systems differ between makers, so compare the technical specifications rather than the part number alone.