SKF NUP 311 ECP/C3 cylindrical roller bearing
- Brand
- SKF
- Category
- Bearings
- Subcategory
- Cylindrical roller bearings
We reply promptly.
Tell us the quantity you need and request a quote by WhatsApp or email.
Other brands for this category
Ask us for alternatives. We check every equivalent against the part number and your application.
Can't find the exact model? Tell us the part number or model you need. We'll track it down and quote it, whether or not it appears in our catalog.
Decoding SKF NUP 311 ECP/C3
- NUP 3Series
- Cylindrical roller bearings, NUP 3 series. Series differ in outside diameter and width even when the bore is the same.
- 11Bore
- Bore 55 mm (11 × 5).
- ECP/C3Suffix
- SKF suffix: identifies the variant, such as seals or shields, cage, internal clearance or other features.
NUP 311 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
SKF NUP 311 ECP/C3 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 NUP 311 ECP/C3 belongs to cylindrical roller 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 NUP 311 ECP/C3 and any equivalents.
SKF NUP ECP cylindrical roller bearings are single-row units built to handle heavy radial loads on shafts. The range includes designations such as NUP 205 ECP/C3, NUP 2210 ECP/C3 and NUP 316 ECP/C3: they follow the same basic arrangement but belong to different series and sizes, so each one has its own dimensions.
A NUP bearing has an outer ring with two ribs and an inner ring that carries one fixed rib plus a loose rib shaped like a washer. The cylindrical rollers run along the raceways in line contact, which gives the bearing good radial capacity with low friction. Those ribs also let it take a limited axial load in either direction, so the shaft is located axially at that point.
In the part number, NUP identifies the design and ECP forms part of the manufacturer's code. The /C3 marking means internal radial clearance above normal, a common choice when the inner ring is a tight fit or when the assembly warms up during operation; the sample also lists /C4, which is larger still. The middle digits define series and size, so the prefix by itself cannot be used to replace a bearing.
Typical applications include large electric motors, gearboxes, fans and pumps, along with other machines that impose high radial loads. Since it positions the shaft axially, it normally sits at the fixed end of the arrangement, while the opposite end uses a cylindrical roller bearing that permits axial movement from thermal expansion.
During installation, protect the raceways and rollers from impact: the outer ring, rollers and cage come away from the inner ring, and the parts must go back together without force. Verify shaft and housing fits, the resulting operating clearance, and lubrication matched to speed and temperature, as set out in the manufacturer's instructions.
To obtain a quote, contact us on WhatsApp or by email and include the complete part number with the /C3 or /C4 suffix, since internal clearance changes the bearing. If anything is unclear, send a photo of the bearing you are removing. We respond promptly.
Dimensions
55 x 120 x 29 mm (d x D x B): boundary dimensions for basic designation NUP 311, according to ISO 15.
- Bore
- 55mm
- Outside diameter (D)
- 120mm
- Width (B)
- 29mm
Same size, other brands
Other brands' pages with basic designation NUP 311: 55 x 120 x 29 mm (d x D x B) per ISO 15.
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 NUP 311 ECP/C3 bearing: what are its dimensions?
- SKF NUP 311 ECP/C3 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 NUP 311.
- What does C3 mean in these bearings?
- C3 denotes internal radial clearance larger than normal, and C4 denotes one larger than C3. It is written into the part number: a bearing with different clearance is not interchangeable without checking the fit.
- What type of loads does a NUP support?
- It carries high radial loads and, because of its ribs, limited axial loads in both directions. That is why it axially locates the shaft where it is mounted.
- Can I replace it with another one from the same series?
- Only if the full part number matches or if it is confirmed that dimensions, internal clearance and ring type are the same. Send us the part number and we will help you verify it.