514 Series
Extra Heavy Thrust Ball Bearings
25–360mm Bore | Single Direction | Maximum Cross-Section | P5/P4/P0 Grade
The 514 series is the heaviest single-direction thrust ball bearing type — featuring the maximum cross-section for the highest axial load capacity in the thrust ball bearing family. Built for extreme thrust applications: large vertical boring mills, hydroelectric turbine thrust pads, marine propeller shaft supports, and structural bridge bearings.
Maximum Axial Load Capacity — Built for Extreme Thrust Applications
Luoyang Songju 514 series extra-heavy thrust ball bearings represent the ultimate in axial load capacity within the thrust ball bearing family. The massive cross-section — with washer thicknesses and ball diameters far exceeding 511/512/513 series — enables the 514 series to handle the most extreme axial loads encountered in industrial and civil engineering applications.
Each 514 bearing is a precision-engineered assembly of thick, through-hardened GCr15 steel washers with a heavy ball complement in a robust pressed steel or machined brass cage. The flat housing washer design maintains simple, reliable geometry — there are no rolling elements to skid, no complex geometries to fail. Pure axial load, pure reliability.
Standard bore range covers 25mm to 360mm. Machined brass cages (M suffix) are standard for sizes above 51410 — providing the robust ball guidance required for the large ball diameters and high contact forces characteristic of this series. For bidirectional extreme loads, contact engineering for double-direction special configurations.
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514 Series Model Parameters
Complete standard model list. d = Bore, D = Outer diameter, T = Height, Ca = Dynamic axial load, C0a = Static axial load. Data per SKF/NTN/NSK catalogs.
| Model | d (mm) | D (mm) | T (mm) | Ca (kN) | C0a (kN) | Mass (kg) |
|---|---|---|---|---|---|---|
| 51405 | 25 | 60 | 24 | 55.6 | 89.2 | 0.336 |
| 51406 | 30 | 70 | 28 | 72.8 | 126.0 | 0.504 |
| 51407 | 35 | 80 | 32 | 87.1 | 155.0 | 0.738 |
| 51408 | 40 | 90 | 36 | 106.0 | 194.0 | 1.060 |
| 51409 | 45 | 100 | 39 | 124.0 | 233.0 | 1.420 |
| 51410 | 50 | 110 | 43 | 146.0 | 282.0 | 1.880 |
| 51412 | 60 | 130 | 51 | 198.0 | 395.0 | 3.100 |
| 51414 | 70 | 150 | 60 | 241.0 | 496.0 | 4.950 |
| 51416 | 80 | 170 | 68 | 287.0 | 610.0 | 7.160 |
| 51418 | 90 | 190 | 77 | 335.0 | 740.0 | 10.300 |
| 51420 | 100 | 210 | 85 | 380.0 | 865.0 | 13.400 |
All models available in P5, P4, P0 precision grades. Standard: GCr15 steel. M suffix (51410+) = machined brass cage as standard. Pressed steel cage for smaller sizes. Oil bath lubrication recommended. Contact engineering for sizes above 51420 and custom configurations.
Why Choose Luoyang Songju 514 Series
The ultimate thrust ball bearing — maximum cross-section for the highest axial load capacity in the series family
Maximum Cross-Section
The largest washers and ball diameters in the thrust ball bearing family. 51420 (100mm bore) weighs 13.4 kg — over 10× the mass of an equivalent-bore 51120 bearing. Every gram of steel contributes to axial load capacity measured in hundreds of kilonewtons.
Extreme Load Survival
Static load ratings exceeding 865 kN (51420) — enough to support a loaded semi-truck on a single bearing. Dynamic ratings engineered for decades of continuous operation under loads that would destroy lighter-series bearings in hours.
Through-Hardened Heavy Rings
Extra-thick washer sections ensure uniform through-hardness and consistent load distribution across the full ball complement. The additional ring mass acts as a heat sink, dissipating frictional heat in continuous-duty applications.
Machined Brass Cage Standard
Models 51410 and above ship with machined brass cages as standard equipment. The superior strength and thermal stability of brass cages are essential for reliably guiding the large-diameter balls under the extreme contact forces of heavy-load operation.
Lubrication Access
The open design provides excellent lubricant access and heat dissipation. Oil bath lubrication is standard for large 514 bearings; circulating oil systems are recommended for continuous high-load, high-speed applications to manage operational temperatures.
SKF/NTN/NSK Interchangeable
Direct dimensional replacement for SKF 514, NTN 514, NSK 514, and FAG 514 series. Same mounting dimensions, same extreme load ratings — competitive pricing and engineering support from Luoyang for the most demanding thrust applications.
Industries & Applications for 514 Series
Trusted across precision industries worldwide for reliable axial load support
Hydroelectric Turbine Thrust Pads
Kaplan and Francis turbine thrust bearings support the entire rotating assembly weight plus hydraulic thrust — often exceeding 1,000 kN in large installations. 514 series bearings are specified for their proven reliability in multi-decade continuous operation.
Marine Propeller Shafts
Ship propeller thrust blocks transmit the propeller's forward (or astern) thrust to the vessel hull. 514 bearings handle shock loading from wave action and ice impact while maintaining reliable thrust transmission in the harsh marine environment.
Large Vertical Boring Mills
The worktable thrust bearing in vertical boring mills and vertical turning lathes. 514 bearings support the combined weight of the workpiece (often exceeding 100 tons) and cutting forces while maintaining precise axial positioning for machining accuracy.
Structural & Bridge Bearings
Civil engineering applications — bridge expansion bearings, building isolation bearings, and structural support points. 514 bearings accommodate thermal expansion and contraction of bridge decks while reliably transmitting vertical structural loads to piers and abutments.
Need 514 Series Extra Heavy Thrust Ball Bearings?
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