NSK 5311 double row angular contact ball bearing
- Brand
- NSK
- Category
- Bearings
- Subcategory
- Double row angular contact ball bearings
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Decoding NSK 5311
- 53Series
- Double row angular contact ball bearings, 53 series. Series differ in outside diameter and width even when the bore is the same.
- 11Bore
- Bore 55 mm (11 × 5).
5311 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
NSK 5311 belongs to double row 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 5311 and any equivalents.
When a shaft has to carry radial and axial loads at the same time, in both directions, a double row angular contact ball bearing is often the answer. The two rows of balls also let the bearing take tilting moments, which suits assemblies where rigidity and precision matter. MR Industrial Accessories LLC supplies the NSK line to industrial plants and maintenance teams in the United States and Latin America.
Reading the code is the quickest way to identify one of these bearings. The designation is a four-digit number beginning with 52, such as 5200, 5201, 5202 or 5207. The first pair of digits marks the double row series; the second pair marks the size, which grows step by step. Every part number covers one specific mix of dimensions and load capacity, so the safest starting point is the full number stamped on the equipment or written on the drawing.
You will find these bearings in centrifugal pumps, compressors, industrial fans, machine tools and transmission equipment. They also fit positions where axial load arrives from both sides, such as milling machine spindles or conveyor rollers. Because of the double row, they handle overhung shaft supports and other arrangements that produce tilting moments.
Selection comes down to a few points. First, sealing: open, shielded or contact seal versions are available, and that choice sets the level of protection against contaminants and the retention of lubricant. Second, lubrication: grease or oil, depending on operating speed and temperature. Third, installation: supports must be aligned and the preload or axial clearance must follow the manufacturer's recommendation. Misalignment speeds up wear on balls and raceways.
Interchange is possible between brands when the main dimensions and tolerances line up. NSK, SKF, FAG, NTN and others build double row angular contact bearings with comparable characteristics. If the number you have comes from another maker, send it over and we can help you pin down the matching NSK reference. Verifying the complete designation and the technical data before fitting a replacement is always worthwhile.
To get a quote, message us on WhatsApp or by email with the part number or the measurements taken from the equipment. We reply promptly and can also guide you on the designation or on which sealing option fits your application.
Dimensions
- Bore
- 55 mm
Frequently asked questions
- What does the 52 series mean in NSK bearings?
- It identifies double row angular contact ball bearings. The first two digits give the series and the last two the size, so 5200 and 5201 share a series but differ in dimensions.
- How do I choose between an open and a sealed bearing?
- Dusty or damp surroundings call for seals or shields. In a clean, well-lubricated position an open bearing can be enough. The working conditions decide.
- Can I replace a bearing from another brand with an NSK one?
- Yes, when the main dimensions and tolerances match. Double row angular contact bearings interchange between brands at equivalent specifications, and we convert the original part number to the NSK reference.