Bushing BK-1: page 10
BK-1 PTFE bushings are the right choice where friction needs to be minimized without constant lubrication.
Unlike bronze or steel bushings, which often require an oil film to function optimally, BK-1 PTFE bushings retain their sliding properties even under conditions of limited or intermittent lubrication. This makes them a popular choice for hydraulic cylinders operating in rapid cycles, where a constant oil film is difficult to maintain over the full stroke length of the rod. The PTFE-based construction also reduces operating noise, a notable advantage for equipment operating near the operator.
The function of BK-1 bushings in guiding shafts within cylinders
The main role of BK-1 bushings is to guide the movement of the rod or shaft inside a hydraulic or pneumatic cylinder, maintaining correct alignment and taking up part of the radial load. The PTFE coating on the contact surface has a very low coefficient of friction, which reduces wear even in the absence of additional lubrication.
Recommendations for correct installation and use
During installation, the rod surface must be clean and free from visible scratches, as any unevenness accelerates wear of the PTFE layer. The bushing must be inserted straight, without applying lateral force, and the clearance between the bushing and the rod must be checked in accordance with the cylinder’s technical specifications — excessive clearance leads to vibration and premature wear.
How to select the correct BK-1 bushings according to dimensions and application
The internal diameter must match the rod exactly, while the external diameter and length of the bushing must fit the cylinder housing. For applications with higher axial loads, it is worth considering XA bushings or E92 bushings, as well as EB65.01 bushings and JDBF bushings for environments with impact loads.
Advantages of buying BK-1 PTFE bushings from the Hydraulic Seals Store
At Hydraulic Seals Store, you’ll find BK-1 bushings made from PTFE, zinc, or bronze in standard sizes, with clear specifications for each application. Our up-to-date stock and fast delivery mean you can carry on with your repairs without long delays.
In addition to the classic pure PTFE version, at Hydraulic Seals Store you’ll also find BK-1 bushings with a metal insert for applications with higher radial loads, where PTFE alone would not provide sufficient rigidity. Each variant is listed separately, with the base material specified, so you can quickly choose the right solution for your cylinder type and the equipment’s operating conditions.