Steel bimetal bushings use a steel backing for strength and press-fit support with a bronze bearing layer on the running surface. They are selected when the application needs a compact wall section, good load capacity, and better heat transfer than many solid polymer bearings.
Common catalog language refers to steel-backed bronze, bimetal wrapped bushings, SAE 792 / SAE 797 style materials, and lead-bronze or lead-free bronze linings.
| Quick spec | Catalog reference |
|---|---|
| Bearing type | Steel-backed bimetal sleeve or flanged bushing |
| Common structure | Low-carbon steel backing with sintered bronze lining |
| Common lining families | CuPb10Sn10, CuPb24Sn4, lead-free CuSn bronze options |
| Typical use | High-load lubricated service in compact spaces |
| Motion types | Rotary and oscillating motion |
| Size format | ID x OD x Length, or catalog part number |
Manufacturing & Performance
Bimetal bushings are made from layered strip, with bronze powder sintered to the steel backing and then rolled or formed into the bearing shape. The steel shell provides structure; the bronze lining provides the bearing surface.
These bushings normally require lubrication unless the selected material system specifically includes a dry-running overlay. They are often used in automotive, hydraulic, agricultural, and heavy equipment assemblies where wall thickness and load capacity are both important.
Standard Tolerances
Bimetal bushing tolerances are tied to the product series, wall thickness, and installed condition. Use catalog tolerances or the print for final inspection.
| Feature | Buying note | Why it matters |
|---|---|---|
| Housing bore | Confirm press-fit recommendation | Controls retention and installed ID |
| Shaft diameter | Match lubricant film and clearance | Prevents seizure or noise |
| Wall thickness | Series-specific | Defines load capacity and replacement fit |
| Split line | Normal on wrapped bushings | Confirm orientation if load direction matters |
| Lubrication groove | Specify holes or grooves | Required for many high-load applications |
Size & Availability
Steel bimetal bushings are available as sleeve bearings, flanged bearings, thrust washers, and custom wrapped forms. Inch and metric catalog sizes are common, with custom lengths, holes, grooves, and material systems available by drawing.
Alternative Materials
- Lead-bronze lined bimetal bushings for traditional lubricated high-load service.
- Lead-free bronze lined bimetal bushings for compliance-sensitive programs.
- C93200 SAE 660 Bearing Bronze when a solid machined bronze part is preferred.
- C95400 Aluminum Bronze for high-strength machined bronze bushings.
Typical Applications
- Steering gears, king pins, pedal pivots, transmissions, and suspension components.
- Hydraulic motors, pumps, cylinders, and lifting equipment.
- Agricultural machines, construction equipment, and material handling systems.
- Diesel engine and powertrain bearing locations where the print calls for bimetal.
RFQ Details That Speed Up Quoting
Send ID, OD, length, flange dimensions, lining material if known, lubrication holes or grooves, shaft diameter, housing bore, load, motion type, and annual volume.