JFK plain bushings
PTFE and sintered bronze
- Unhardened shafts
- Linear and rotational movements
JFK plain bushings, also known as linear bushings or linear plain bearings, are sliding bushings consisting of an anodized aluminum alloy body containing two bushings (PTC..SL or PTC..RK Series) made from a steel strip protected by a few-micron-thick copper or tin coating, onto which a porous bronze layer with PTFE or PPS is sintered.
PTFE is a plastic material with an extremely low coefficient of friction, while PPS is a high-performance material with a cross-linked structure that allows for higher applicable specific pressure. Unlike ball recirculating bushings, plain bushings offer two key advantages: they can operate on unhardened shafts and also allow rotation around the shaft axis in addition to linear motion.
Both the heavy-duty BA and BAO Series and the light-duty BAL Series are supplied as standard with two wiper rings that continuously keep the shaft clean, extending the service life of the internal bushings.
Versions
Three series: how to choose the right linear ball bushing
The choice between the heavy-duty and light-duty series depends on the load and the available housing. The BA Series is dimensionally interchangeable with KB ball recirculating bushings; BAO with KB_O; and BAL with KH.
BA Series - Heavy-duty, closed
Anodized aluminum alloy body, PTC steel bushings with PTFE/bronze. Dimensionally interchangeable with the KB Series ball recirculating bushings. Two standard wiper rings keep the shaft clean. Available with one seal (BA..U), two seals (BA..UU), or without seals (BA..). Heavy-duty series · Closed · Dimensionally interchangeable with KB
BAO Series - Heavy-duty, open
Same features as the BA Series, with an open design for housings with a longitudinal opening. Dimensionally interchangeable with the KB_O Series ball recirculating bushings. Two standard wiper rings. Heavy-duty series · Open · Dimensionally interchangeable with KB_O
BAL Series - Light-duty, closed
Light-duty closed series for applications with lower loads. Dimensionally interchangeable with the KH Series ball recirculating bushings. Two standard wiper rings. Reduced space requirements compared to the heavy-duty series. Light-duty · Closed · Interchangeable with KH
Performances
Design and performance features
Anodized aluminum body with PTFE/bronze bushings and integrated wiper rings for long service life on untreated shafts.
Shaft
Unhardened · Reduction in production costs The main advantage over ball recirculating bushings: they operate on unhardened shafts, eliminating the need for shaft heat treatment and its associated costs.
Movement
Combined linear and rotary Unlike ball recirculating bushings, they also allow rotation around the shaft axis in addition to linear motion, making them suitable for applications with combined movements.
Material
PTFE or PPS on sintered bronze PTFE provides an extremely low coefficient of friction. PPS allows for higher applicable specific pressure.
Shaft cleaning
Two standard wiper rings The two integrated wiper rings continuously keep the shaft clean, extending the service life of the internal bushings even in environments with dust or contaminants.
Temperature
The same operating temperature range as ball recirculating bushings, suitable for most standard industrial applications.
Seals
One, two or none seals Available with one seal (suffix U), two seals (UU), or without seals to meet the different protection requirements of the application.
Mounting
Plain bushing installation
Unlike ball recirculating bushings, the shaft does not require hardening, but it must still meet the appropriate dimensional tolerance and surface roughness requirements to ensure proper fit with the PTFE/bronze bushings and effective sealing by the wiper rings.
Installation Mounting
- Checking shaft tolerance and surface roughness
- Bushing and wiper ring installationInstall the bushing onto the shaft, ensuring that the wiper rings remain correctly positioned at both ends to keep the shaft continuously clean during operation and extend the service life of the internal bushings.
Technical data
- Shaft
- Unhardened · Reduction in production costs
- Movement
- Combined linear and rotary
- Material
- PTFE or PPS on sintered bronze
- Shaft cleaning
- Two standard wiper rings
- Seals
- One, two or none seals
Applications
Applications
Components and application support for every industrial environment.
Applications with unhardened shafts
When shaft heat treatment is not economically viable or technically feasible. Plain bushings provide good performance on standard machined shafts.Combined linear and rotational movements
Machines with axes requiring both linear and rotational motion. Ball bushings do not allow this combination.
Industrial automation
Systems with linear motion and reduced maintenance requirements. Wiper rings extend service life in environments with dust and contaminants.
Agricultural and gardening machinery
Applications with moderate loads in demanding environments. The robust anodized aluminum body and corrosion resistance are specific advantages.
Contacts
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Related products
Please also consider these alternatives: For converting rotary motion into linear motion in combination with linear ball bushings. When the shaft can be hardened and maximum performance is required in terms of precision and load-bearing capacity. For linear motion on rails requiring greater rigidity and load capacity.
