The Step Bearing Set (Part 18564932) is the complete upper thrust bearing assembly engineered for the ThyssenKrupp Kubria F210 Cone Crusher. The set includes the step bearing, retainer, dust seal, and mounting hardware required to restore main shaft support and axial positioning during the crushing cycle — a direct-fit replacement for OEM part 18564932.

★OEM EquivalentDirect replacement for Kubria F210 original step bearing assembly 18564932. Drop-in fit, no modification.

Complete SetBearing + retainer cover + dust seal + hardware. Replace the whole assembly in one shutdown.

▲High-Load CapacityAlloy-steel bearing + bronze backing handles the main shaft’s vertical load and impact forces.

✓QA InspectedDimensional check, hardness test, surface finish and run-out inspection before shipment.

1. What Is a Step Bearing Set in a Cone Crusher?

In a cone crusher, the step bearing sits at the top of the main shaft (between the shaft head and the spider arm). It performs three critical functions simultaneously:

• Supports the main shaft vertically — absorbs the entire weight of the shaft plus crushing forces during the crushing cycle.
• Provides axial positioning — prevents the shaft from moving up or down inside the crushing chamber, keeping CSS (closed side setting) stable.
• Allows controlled rotation — the polished bearing surface lets the shaft rotate at low speed (typically 400-600 RPM) with minimum friction.

The step bearing set is the complete service assembly — the bearing itself, the retainer cover that holds it in place, the dust seal that keeps contamination out of the oil film, and the mounting hardware. When the step bearing fails (spalling, brinelling, overheating from oil starvation, or seal contamination), the whole set is normally replaced together during a planned shutdown.

2. Components in This Set

3. Compatible Equipment

This step bearing set is engineered specifically for the following ThyssenKrupp Kubria cone crusher models:

Cross-reference numbers: 18564932 (primary) · ThyssenKrupp drawing reference available on request.

4. Working Principle

5. Key Features & Advantages

• Direct OEM replacement — engineered to match Kubria F210 original part 18564932 dimensions, tolerances and load rating. No frame modification required.
• High-grade alloy steel — through-hardened bearing surface (58-62 HRC) resists brinelling, spalling and fatigue under cyclic impact loads.
• Concentric ring pattern — precision-machined grooves on the bearing face ensure uniform oil film distribution and reduce localized hot spots.
• Bronze backing ring — accommodates minor axial float without galling, extending bearing life during start-up and shutdown.
• Labyrinth + lip dust seal — double protection against dust ingress; critical in crushing environments where fines contaminate lubricant.
• Pre-assembled kit — saves 6-8 hours of downtime vs. sourcing components separately; everything fits together out of the box.
• Serial-number traced QC — every set is dimensionally inspected, hardness-tested and run-out checked before packing.
• Stock available — lead time typically 5-10 working days from stock; expedited options for emergency breakdowns.

6. Typical Applications

The Kubria F210 cone crusher is widely deployed across the mining and aggregate industries. The 18564932 step bearing set supports the following operations:

• Iron ore mining — secondary and tertiary crushing of magnetite and hematite ore.
• Copper ore processing — medium-hard ore crushing in concentrator plants.
• Gold ore crushing circuits — hard rock gold operations in Africa, South America and Australia.
• Granite and basalt quarries — aggregate production for construction and infrastructure.
• Cement plant raw material preparation — limestone and clinker crushing.
• Industrial mineral processing — quartz, feldspar, andalusite and similar abrasive feedstocks.

7. Material & Manufacturing Process

8. Quality Control & Inspection

Every 18564932 step bearing set undergoes the following inspection protocol before shipment:

• Dimensional inspection — critical diameters, heights and bolt-circle patterns verified with CMM.
• Hardness testing — surface and core hardness checked on bearing disc (target 58-62 HRC surface).
• Surface finish — bearing contact face roughness Ra measured (target ≤ 0.4 µm).
• Run-out test — axial and radial run-out checked against drawing tolerance.
• Ultrasonic testing (UT) — bearing disc inspected for internal defects per ASTM A388.
• Magnetic particle inspection (MPI) — surface crack detection on critical load-bearing surfaces.
• Visual & packaging check — final QC before export crating; matching components verified.

9. Packaging & Shipping

• Individual wrapping — each component wrapped in VCI anti-rust film + bubble wrap.
• Inner packing — foam-fitted wooden crate with cardboard separators.
• Outer packing — ISPM-15 compliant fumigated plywood export crate, heat-treated and stamped.
• Marking — crate labeled with part number 18564932, quantity, net/gross weight, and “Fragile / Heavy” handling marks.
• Shipping options — sea freight (FCL / LCL), air freight, or courier (DHL / FedEx / UPS) for emergency orders.
• Documents — commercial invoice, packing list, material certificate (EN 10204 3.1), heat-treatment certificate, QC report.

10. Specification Table

11. Why Buy From MiningSpares

• Specialized in crusher wear parts — our core focus is cone crusher replacement parts for ThyssenKrupp Kubria, Trio, Sandvik, Metso, Symons, Telsmith and other major brands.
• Direct factory pricing — we manufacture in-house with foundry partners, eliminating middleman markups.
• Large inventory — common parts ready to ship; emergency breakdown orders prioritized.
• Engineering support — we help you cross-reference part numbers and confirm fitment by crusher serial number.
• Global export experience — we ship to 60+ countries with full export documentation.
• Quality guaranteed — every part comes with material certificate and dimensional QC report.