Tag Archives: locking device

China OEM Z4 Shaft Locking Device Clamp Shrink Disc Locking Shaft Coupling

Product Description

Z4 Shaft Locking Device Clamp Shrink Disc Locking Shaft Coupling


Z4 type expansion sleeve consists of an open double cone inner ring with different taper and an open double cone outer ring and 2 double cone compression rings, which are locked with hexagon socket bolts.

Compared with the Z2 type, the joint surface length is high, the centering precision is high, and it is used in the case where the rotation precision is required to be high and a large load is transmitted.
When selected, the tolerance bands of the shaft and the hole combined with the expansion sleeve are h8 and h9 respectively;

Material: 45# steel 

Nominal torque/ rated torque:  6.85KNm-245KNm 

Hole diameter: 70mm- 300mm 

The Z4 type expansion joint screw has a mechanical performance rating of 12.9.


1. installation:

The expansion sleeve is greased at the factory and can be installed directly. When installing, first screw 3 bolts 4 into the screw holes of the flange of the other part 1 and spread them evenly around the circumference to open the inner sleeve 1 and the outer sleeve 2. Then place the expansion sleeve into the hub hole of the design position and tighten the bolt with the force gauge. The method of tightening is to screw each bolt to 1/4 of the rated torque at a time. The order of tightening is bounded by the slit. The left and right cross symmetry is tightened 1 after the other to ensure that the rated torque value is reached. 

2. Disassembly:

Loosen all bolts a few turns before disassembly. Then screw in the bolt 4 top loose sleeve in the disassembled screw hole. 

3. Protection:

MoS2 oil is strictly prohibited during installation to prevent contamination of the expansion sleeve. On machines with poor open air or working environment, rust-proof grease should be applied regularly on the exposed end face and bolts of the expansion sleeve. The expansion sleeve type with better rust resistance should be selected.

Product parameters:
1. Easy to install and disassemble;
2. Good exchangeability;
3. Long lifetime and high efficient transmitting;
4. While running under overload, it can protect the equipment from breakdown.

Packing and shipping
1 Prevent from damage.
2. As customers’ requirements, in perfect condition.
3. Delivery : As per contract delivery on time
4. Shipping : As per client request. We can accept CIF, Door to Door etc. or client authorized agent we supply all the necessary assistant

Q 1: Are you a trading company or a manufacturer?
A: We are a professional manufacturer specializing in manufacturing
various series of couplings.

Q 2:Can you do OEM?
Yes, we can. We can do OEM & ODM for all the customers with customized artworks in PDF or AI format.

Q 3:How long is your delivery time?
Generally, it is 20-30 days if the goods are not in stock. It is according to quantity.

Q 4: How long is your warranty?
A: Our Warranty is 12 months under normal circumstances.

Q 5: Do you have inspection procedures for coupling?
A:100% self-inspection before packing.

Q 6: Can I have a visit to your factory before the order?
A: Sure, welcome to visit our factory.

disc coupling

Industry Standards and Guidelines for Disc Couplings

Disc couplings, like other mechanical components, are subject to various industry standards and guidelines that ensure their safe and reliable operation. Some relevant standards include:

  • API Standard 671: This American Petroleum Institute (API) standard provides guidelines for special-purpose couplings for use in petroleum, chemical, and gas industry services. It covers the design, materials, testing, and inspection of couplings, including disc couplings.
  • AGMA Standard 9001: The American Gear Manufacturers Association (AGMA) standard 9001 addresses flexible couplings, including disc couplings, and provides recommendations for their design, installation, and maintenance.
  • ISO 14691: This International Organization for Standardization (ISO) standard covers general-purpose industrial couplings, including disc couplings, and provides guidance on their selection, installation, and operation.

Manufacturers and engineers often refer to these standards and guidelines to ensure that disc couplings are designed, manufactured, and used according to recognized industry practices. Adhering to these standards helps enhance the reliability, safety, and performance of disc couplings in various industrial applications.

disc coupling

Impact of Number and Configuration of Disc Packs on Coupling Performance

The number and configuration of disc packs in a disc coupling have a significant impact on its overall performance. Here’s how:

  • Number of Disc Packs: Increasing the number of disc packs can enhance the coupling’s torque capacity and stiffness. This allows it to handle higher levels of torque while maintaining its flexibility to accommodate misalignment.
  • Configuration: Different configurations, such as single-flex, double-flex, or multiple-flex, offer varying degrees of angular misalignment compensation and torsional stiffness. Single-flex configurations provide greater misalignment capacity, while double-flex configurations offer improved torsional stiffness.

Choosing the appropriate number and configuration of disc packs depends on the specific application requirements:

  • Torque Transmission: Applications with high torque demands may benefit from a higher number of disc packs to ensure reliable torque transmission.
  • Misalignment Compensation: Applications with moderate misalignment may opt for configurations that offer higher angular misalignment compensation.
  • Torsional Stiffness: For applications where torsional stiffness is critical, a configuration with multiple-disc packs may be preferred.
  • Space Limitations: Consider the available space and coupling dimensions when choosing the number and configuration of disc packs.
  • Dynamic Behavior: Depending on the application’s dynamic behavior and vibration characteristics, the appropriate configuration can be selected to minimize resonances.

Ultimately, the selection of the number and configuration of disc packs in a disc coupling should be based on a thorough understanding of the application’s torque, misalignment, and stiffness requirements to optimize coupling performance and reliability.

disc coupling

Considerations for Selecting a Disc Coupling for a Specific Application

Choosing the right disc coupling for a particular application involves considering several important factors to ensure optimal performance and reliability:

  • Torque Requirements: Determine the maximum and continuous torque requirements of the application. Select a disc coupling that can handle the expected torque without exceeding its rated capacity.
  • Misalignment: Evaluate the type and magnitude of misalignment expected in the system, including angular, parallel, and axial misalignment. Choose a disc coupling with the appropriate misalignment capability to accommodate these factors.
  • Speed and RPM: Consider the operating speed and rotational speed of the connected shafts. High-speed applications may require disc couplings with balanced design to prevent vibration issues.
  • Space Limitations: Evaluate the available space for installing the coupling. Disc couplings are compact and can be suitable for applications with limited space.
  • Environmental Conditions: Assess the operating environment, including temperature, humidity, presence of corrosive agents, and exposure to dust or debris. Choose materials and coatings that can withstand the environmental conditions.
  • Shaft Sizes: Ensure that the disc coupling’s hub bore sizes match the shaft sizes of the connected equipment.
  • Alignment Maintenance: Consider the ease of installation and alignment maintenance. Some disc couplings feature spacer elements that simplify alignment and reduce downtime during maintenance.
  • Backlash: Evaluate the backlash or play that the coupling introduces between the shafts. Backlash can affect the accuracy of position and torque transmission in precision applications.
  • Dynamic Balancing: For high-speed applications, consider disc couplings that are dynamically balanced to prevent vibration issues that can arise from rotational imbalance.
  • Resonance and Damping: Determine if the coupling design includes features to dampen vibrations and reduce the risk of resonance in the system.
  • Service Life: Estimate the expected service life based on the application’s duty cycle and requirements. Choose a disc coupling with a suitable service life to avoid frequent replacements.
  • Cost and Value: Compare the cost of the disc coupling with its features, performance benefits, and expected lifespan. Choose a coupling that provides the best value for your specific application.

By carefully considering these factors, you can select a disc coupling that meets the unique requirements of your machinery system and ensures reliable operation.

China OEM Z4 Shaft Locking Device Clamp Shrink Disc Locking Shaft Coupling  China OEM Z4 Shaft Locking Device Clamp Shrink Disc Locking Shaft Coupling
editor by CX 2023-12-13