The HA 311 Adaptor Sleeve with Lock Nut 50X81X57,5 by SKF is an essential component for securing bearings onto cylindrical shafts. This adaptor sleeve, measuring 50 mm in bore diameter, 81 mm in outer diameter, and 57.5 mm in width, is designed to enable precise and secure mounting of bearings. Typically used in applications requiring tight assembly and easy dismounting, it is a crucial accessory in mechanical industries where SKF’s precision components are valued.
Technical specifications
| Specification | Value |
| Bore diameter (d) | 50 mm |
| Outer diameter (D) | 81 mm |
| Width / Thickness (B) | 57.5 mm |
| Weight | NA |
| Basic dynamic load rating (C) | NA |
| Basic static load rating (C0) | NA |
| Limiting speed | NA |
| Reference speed | NA |
| Cage type | NA |
| Shielding / Sealing | Open |
| Operating temperature range | NA |
| Ring material | NA |
| Factory lubrication | NA |
| Precision class | NA |
| Internal clearance | NA |
| ISO / cross-reference equivalent code | NA |
Technical advantages
The HA 311 Adaptor Sleeve with Lock Nut offers several technical advantages that enhance its suitability for industrial applications:
- Ensures secure mounting of bearings on cylindrical shafts, reducing assembly time.
- Facilitates easy dismounting, minimizing maintenance downtime.
- Standard Open design for applications where dust exposure is controlled.
- Compatible with a wide range of bearing types, increasing versatility.
- Manufactured by SKF, ensuring compatibility with their extensive bearing catalog.
Typical applications
The HA 311 Adaptor Sleeve with Lock Nut is utilized in a variety of industrial settings, providing reliable performance across different sectors:
- Textile machinery (spinning frames, weaving looms)
- Food processing equipment (conveyor systems, mixers)
- Mining and construction machinery (crushing and screening equipment)
- Pulp and paper industry (paper machines, dryers)
- Automotive manufacturing (assembly lines, testing rigs)
Availability and ordering
Eurobearing.eu, a specialized B2B supplier, offers fast availability of the HA 311 Adaptor Sleeve with Lock Nut. Businesses can conveniently add the product to their cart or request a quotation for bulk quantities. Trust Eurobearing.eu for all your mechanical component needs.

