NSK 51109 thrust ball bearing
- Brand
- NSK
- Category
- Bearings
- Subcategory
- Thrust ball bearings
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Other brands for this category
Ask us for alternatives. We check every equivalent against the part number and your application.
SKF and NSK: matching part numbers →NSK and FAG: matching part numbers →NSK and NTN: matching part numbers →NSK and RKB: matching part numbers →
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Decoding NSK 51109
- 511Series
- Thrust ball bearings, 511 series. Series differ in outside diameter and width even when the bore is the same.
- 09Bore
- Bore 45 mm (09 × 5).
51109 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
NSK 51109 measures 45 mm across the bore and 65 mm across the outside diameter; its height is 14 mm (45 x 65 x 14 mm).
NSK 51109 belongs to thrust 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 51109 and any equivalents.
For equipment that carries axial load in a single direction, the NSK thrust ball bearing offers a straightforward solution. Its construction pairs two washers with a row of balls, so the bearing turns with minimal friction while the load runs along the shaft. You will find it in machine tools, gearboxes, industrial machinery and other mechanisms that call for accurate axial positioning.
The part number tells you most of what you need. In the 51100, 51101, 51102, 51103, 51104, 51105, 51106 and 51107 series, each step upward signals a larger bore and a higher axial load capacity. These are single-direction bearings. Reading the code this way lets you match a replacement to the space and load in front of you without digging through catalogs.
Thrust ball bearings show up in metalworking, food processing, chemical and petrochemical plants, among others. Typical locations include machine tool spindles, centrifugal pumps, speed reducers, clutches, lathe faceplates and lifting mechanisms. Where axial positioning must be precise and friction kept low, even at high speed, this bearing type fits the job.
Selection comes down to a few checks: how large the axial load is, which way it acts, the operating speed and the surrounding conditions. The washer support surfaces need to be parallel and aligned, because these bearings do not accommodate angular misalignment. Grease or oil lubrication reduces friction and supports service life, while seals or added protection keep dust and particles out in harsh settings.
Bearings that share the same dimensional designation are generally interchangeable between brands, provided tolerances and load ratings line up. NSK covers a broad range that can stand in for other equivalents. If you are working from another brand's number or an unmarked part, send it over and we will quote it and point you to the compatible alternative.
To get a quote on NSK thrust ball bearings, message us on WhatsApp with the part number or the size you need. We quote the exact part or size you send and respond promptly.
Dimensions
45 x 65 x 14 mm (d x D x H): boundary dimensions for basic designation 51109, according to ISO 104.
- Bore
- 45 mm
- Outside diameter (D)
- 65mm
- Height (H)
- 14mm
SKF and other brands, same size
Other brands' pages with basic designation 51109: 45 x 65 x 14 mm (d x D x H) per ISO 104.
What they share are the ISO 104 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
- NSK 51109 bearing: what are its dimensions?
- NSK 51109 measures 45 mm across the bore and 65 mm across the outside diameter; its height is 14 mm (45 x 65 x 14 mm). Those are the boundary dimensions standardized in ISO 104 for basic designation 51109.
- What does the designation 51100 mean on an NSK thrust ball bearing?
- The 51100 series covers single-direction thrust ball bearings. The digits that follow indicate bore diameter: a higher number means a larger bore and greater axial load capacity. That makes it easier to select the right size for your application.
- How do I choose the right thrust ball bearing for my equipment?
- Start with the axial load, speed, available space and environmental conditions. Confirm that the supporting surfaces are parallel and aligned. Lubrication and sealing also affect performance. If you need help, send us your equipment data.
- Can I replace a thrust ball bearing from another brand with an NSK one?
- Yes, when dimensions and load capacities match. Standardized thrust ball bearings are usually interchangeable between brands. Send us the original part number and we will quote the NSK equivalent that suits your application.