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51307 BCI Thrust Bearing
  • 51307 BCI Thrust Bearing
  • A GEM bearing part in clear plastic wrapping placed below its pink and blue retail box on a light wood surface. The box shows the GEM brand and model number 51306.
  • A BKE Bearings steel bearing, model 51308, shown with its original blue cardboard packaging box on a light wood tabletop.
  • A circular GEM 51311 metal bearing wrapped in clear plastic, placed on a light wood surface.
  • 51307 BCI Thrust Bearing
  • A GEM bearing part in clear plastic wrapping placed below its pink and blue retail box on a light wood surface. The box shows the GEM brand and model number 51306.
  • A BKE Bearings steel bearing, model 51308, shown with its original blue cardboard packaging box on a light wood tabletop.
  • A circular GEM 51311 metal bearing wrapped in clear plastic, placed on a light wood surface.
51300 Series ISO Metric Heavy-Duty Thrust Ball Bearings

51300 Series ISO Metric Heavy-Duty Thrust Ball Bearings

The 51300 Series is an ISO metric-dimension series of single-direction thrust ball bearings designed specifically for heavy-duty axial-load applications. Compared to the 51100 (extra-light series) and 51200 (medium-light series), the 51300 series features significantly larger steel balls and thicker raceway rings, granting it exceptional axial rigidity and high dynamic load capacity under heavy thrust forces.

Key Features & Construction

  • 3-Piece Separable Design: Comprises a shaft washer (tight fit on the shaft), a housing washer (loose fit in the housing bore), and a guided ball-and-cage assembly.

  • Pure Axial Load Capability: Designed to accommodate heavy loads parallel to the shaft in a single direction ($90^\circ$ contact angle). Note: Cannot withstand any radial forces.

  • High Load Capacity: Thick washers and larger rolling elements absorb heavy operational thrust, shock loads, and peak press forces.

  • Flat-Seat Mounting: Standard 51300 series bearings feature flat seats for direct, rigid mounting against flat shaft steps and housing shoulders.

Common Industrial Applications

  • Crane Hooks & Hoisting Equipment: To support heavy suspended loads while allowing smooth rotational swiveling.

  • Screw Jacks & Mechanical Actuators: Transmitting heavy vertical linear thrust.

  • Heavy Lathe Machine Tailstocks: Supporting intense workpiece clamping forces.

  • Vertical centrifuges & Heavy Pumps: Absorbing axial fluid/impeller thrust.

  • Industrial Valves & Rotary Tables: Operating under high axial seal pressures.

Mounting & Maintenance Instructions

  1. Shaft vs. Housing Washer Fit: Ensure the shaft washer (smaller inner diameter, tight fit) is seated directly against the shaft shoulder. The housing washer (larger inner diameter, loose fit) must sit in the stationary housing bore.

  2. Alignment & Squareness: Raceways must sit strictly perpendicular to the axis of rotation ($90^\circ$). Misalignment causes concentrated stress on one side of the ring, leading to micro-spalling.

  3. Minimum Preload: Maintain a continuous minimum axial force ($F_{a\text{ min}}$) to prevent ball skidding or cage distortion during high-speed rotation or dynamic unload cycles.

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