Plastic Bushes
Plastic bushes are machined or moulded plain bearings in nylon, acetal, PTFE, PEEK, UHMWPE and similar materials that run quietly, resist corrosion and often need no lubrication. They replace bronze and steel bushes in food, packaging, agricultural and automation equipment.
What it is
Plastic bushes are turned from rod or tube to fit housings and shafts, with press fits, flanges, grooves or split designs as needed. Material is selected by load, speed, temperature, lubrication and chemicals, often checked by pressure-velocity (PV) limits.
They are light, self-lubricating, electrically insulating and don't corrode, and they protect shafts from wear.
Typical applications
- Food and packaging machinery
- Agricultural pivots and linkages
- Conveyor and automation equipment
- Marine and outdoor mechanisms
- Pumps and chemical equipment
Materials & grades
- Nylon (oil-filled, MoS2)
- Acetal (POM)
- PTFE and filled PTFE / Rulon
- PEEK (high temperature)
- UHMWPE
Points to consider
- Allow larger running clearance than metal bushes for thermal expansion and moisture.
- Check PV limits for the chosen material.
- Press-fit reduces the bore; confirm bore size after fitting.
- Plastics conduct heat poorly; high speeds may overheat.
Frequently asked questions
Can plastic bushes replace bronze bushes?
In many applications yes, especially where corrosion, noise or lubrication are issues, provided load, speed and temperature are within limits.
Which plastic is best for bushes?
Oil-filled nylon or acetal for general use, filled PTFE/Rulon for dry running, PEEK for high temperature.
Do plastic bushes need grease?
Many run dry; light lubrication can extend life in some materials.