Keyless Shaft Bushings
Keyless shaft bushings provide solid connections between the shaft and hub, without stress or wear to mounted components. Using hydraulic pressure to maintain their position, they eliminate keyways, tapers, and tapped holes, which can cause component stress and wear due to fretting, corrosion, and backlash.
A keyless shaft bushing does not rely on the key to transmit torque, but instead utilizes the entire circumference of the shaft for more efficient performance with little to no backlash. Hydraulic pressure is distributed evenly over the full length of the connection, reducing micro-movement which can cause fretting.
Keyless bushings make mounting components an easier, faster, and more precise process. All you need to do is mount, set in position, and lock the bushing with a torque wrench. Unlike bushings with keyways, a keyless locking bushing is infinitely phase-adjustable, both radially and axially. This makes them more precise and easier to use. They can be tightened and repositioned with minimal downtime and without causing additional wear on the shaft or components.
And, because they eliminate the need for milled keyways in shafts, smaller shafts can be used to transmit the same amount of torque, thereby saving space and material.
Zero-Max’s ETP Keyless Bushings
Zero-Max’s ETP keyless bushings are the perfect locking devices for shaft-to-hub connections. ETP connections are ideal for positioning and locking shaft components in a system, and provide the best solution where keyways and tapers can weaken or cause excess wear to shaft couplings.
Our ETP keyless bushings also address applications for synchronizing moving parts. They enable precision mounting of shaft components where frequent readjustment is required, in systems where balance and runout are inherent problems, and where common fastening, adjusting, and holding of shaft components are required.
We offer ETP keyless locking devices that are designed to solve specific application requirements, such as high transmittable torque. Our ETP Classic and Express keyless bushings are available in stainless steel for corrosion protection and to handle frequent wash downs.
Proven Design. Easy To Use.
ETP keyless bushings feature double-walled sleeves and tightening mechanisms that form solid, continuous connections between shafts and hubs when tightened. The hydraulic design of ETP locking bushings is based on Pascal’s Law: “A liquid confined to a vessel which is subjected to pressure distributes the pressure uniformly upon the walls of the vessel.”
All our ETP keyless locking devices slide easily onto shafts, and securely lock in position on most shaft mounted motion control components. Disassembly is equally fast. See specific model information for complete operating instructions.
For more information on our low runout, ETP keyless shaft bushings, contact us or find your local sales representative.
ETP Classic Keyless Shaft Bushings
The Classic Series is comprised of a double-walled hardened steel sleeve filled with a specially designed pressure medium. When the ETP Classic’s clamping screws are tightened, the sleeve expands uniformly against hub and shaft to create a rigid joint.ETP Classic Stainless Steel Keyless Shaft Bushings
Built with all-stainless steel components, these ETP Classic locking bushings are ideal for food contact and pharmaceutical applications, as well as those requiring frequent wash-down. Stainless steel models function in the same way as the standard ETP Classic, but provide lower transmittable torque. Click here to learn more.ETP Express Keyless Shaft Bushings
Featuring a design similar to the Classic Series, ETP Express keyless bushings utilize a single actuation screw for pressurization, allowing for the fastest installation and repositioning of any of our locking bushings. Because the screw is tightened from the radial direction, no shaft space is used for mounting tools—other components can be mounted on the shaft, all the way up to the flange. Click here to learn more.ETP Express Stainless Steel Keyless Shaft Bushings
With all exposed components manufactured from stainless steel and a food-grade pressure medium, these ETP locking bushings are ideal for food and beverage processing applications. The stainless steel models feature the same single-screw actuation as standard ETP Express keyless bushings for fast installation. Click here to learn more.ETP Hydropress Keyless Bushings
Users can vary the transmittable torque or axial force of ETP Hydropress keyless shaft bushings by changing the mounting pressure. They provide easy mounting/dismounting of large components in tight spaces. These locking bushings can be mounted quickly, using only a grease pump. They are designed for radial or axial connection, and fine adjustments can be made when mounting. Click here to learn more.ETP Hyloc Keyless Bushings
ETP Hyloc bushings are hydro-mechanical joints that consist of a double-walled steel sleeve enclosing a conical moveable piston. An external hydraulic pump is required for mounting and dismounting. When the piston is moved by pressure from the pump, the sleeve expands uniformly against the hub to provide a secure joint. Multiple threaded connections in the flange allow for radial or axial connections. Click here to learn more.ETP Power Keyless Shaft Bushings
Comprised of a double-walled steel sleeve filled with specialty pressure fluid, ETP Power locking bushings use a single actuation screw piston in the flange to pressurize the connection to the shaft and to maintain that pressure. Two pre-machined bores in the flange can be used to attached these bushings to mounted components when not pressurized. Click here to learn more.ETP Techno Keyless Bushings
The ETP Techno Series are our highest precision keyless bushings. Designed for high concentricity in applications that require frequent mounting/dismounting or adjustments, these locking bushings have a runout accuracy of 0.0002”. All ETP Techno models operate on built-in, closed-loop hydraulic systems that are activated via a single actuation screw for fast installation and adjustment. Click here to learn more.Posi-Lok® Keyless Shaft Bushings
Specially engineered for excellent axial and radial runout in a variety of shaft-mount applications, Posi-Lok® keyless bushings feature a locking mechanical wedge design for high torque transmission. Socket-head actuation screws tighten quickly and easily. Nickel plated finish provides reliable corrosion protection in harsh environments; stainless steel models are also available. Click here to learn more.Features & Benefits of ETP Keyless Bushings
- Mount or dismount in 10 seconds or less for reduced assembly time
- Shorten downtime for field service
- Very few mounting screws, with low tightening torque
- No special tools required
- Fast changeovers
- Zero backlash for improved performance: does not add component backlash to the system
- Superior concentricity: requires little to no readjustment of mounted components after installation
- Good corrosion resistance
- Low profile dimensions: can be used on smaller diameter hubs
- Can be mounted and dismounted over and over again, reducing the cost of replacement components
- No keyway required: ETP keyless bushings can be mounted on a keyless shaft, thereby reducing machining costs
- Select models are available with single-screw actuation systems to quickly and accurately mount components
- Stainless steel models available for food/beverage, pharmaceutical, and frequent wash-down applications
