Built for reliability where it matters most, the Holroyd 3T bearing kit is engineered to keep heavy-duty trailers towing safely and smoothly under demanding conditions. Designed for durability and consistent performance, each kit includes precision-matched, high-quality bearing components to help reduce wear, improve reliability and support long-distance towing confidence.
โ Designed for up to 3 tonne trailer applications
โ Precision-matched bearings and seals for reliable fitment
โ Helps reduce heat build-up and premature wear
โ Ideal for caravans, plant trailers, horse floats and heavy-duty trailer setups
โ Built to handle demanding Australian towing conditions
Bearing Kit Includes:
- Dust Cap
- Seal
- Inner and Outer Bearings
- Split Pin
Dimensions
Core Dimensions & Specifications
Bore Diameter (ID): 50MM
Outer Diameter (OD): 80MM
Width: 20MM (Cone width: 20MM, Cup width: 15.5MM)
Weight: approx 0.38KG
| Bearing Dimensions | ||
| d | 38.1 mm | Bore Diameter |
| D | 65.088 mm | Outside Diameter |
| T | 18.034 mm | Total Width |
| B | 18.288 mm | Inner Ring Width |
| C | 13.97 mm | Outer Ring Width |
| Cup r (min.) | 1.3 mm | Outer Ring Chamfer |
| Cone r (min.) | 2.3 mm | Inner Ring Chamfer |
| Load Capacity Ratings | ||
| Cr | 52,000 N | Dynamic Load Rating |
| C0r | 55,000 N | Static Load Rating |
| Maximum Operating Speeds | ||
| Grease | 5,300 minโปยน | Grease Lubrication |
| Oil | 7,500 minโปยน | Oil-Bath Lubrication |
| Mounting & Fitment Dimensions | ||
| a | 13.7 mm | Effective Load Centre |
| da | 46 mm | Shaft Abutment Diameter |
| Da | 59 mm | Housing Abutment Diameter |
| db | 42.5 mm | Shaft Abutment Diameter |
| Db | 62 mm | Housing Abutment Diameter |
| ra (max.) | 2.3 mm | Inner Ring Fillet Radius |
| ra (max.) | 1.3 mm | Outer Ring Fillet Radius |
| Engineering Factors | ||
| e | 0.33 | Constant |
| Y0 | 0.99 | Axial Load Factor |
| Y1 | 1.8 | Axial Load Factor |
| Bearing Weight | ||
| Cone | 0.16 kg | Approximate Weight |
| Cup | 0.079 kg | Approximate Weight |
Performance & Ratings
Dynamic Load Rating:61,000N
Static Load Rating:87,000N
Reference Speeds: Up to 4,300r/min (Grease) and 6,000r/min(Oil)
Calculation Factors: e = 0.42 Y_0 = 0.78 Y_1 = 1.4
Key Design Features
Key Design Features
Separable Design: The bearing consists of two main separable parts โ the “cone” (inner ring, cage, and rollers) and the “cup” (outer ring). This makes mounting and adjusting highly efficient.
Tapered Raceways: The conical shape creates a linear contact patch that allows it to absorb high-stress combined forces.
Paired Mounting: Because it is a single-row bearing, it must generally be mounted in a mirror-image arrangement (such as O, X or tandem configurations) alongside a second tapered roller bearing.
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