The QP & CQP Series Pneumatic Caliper Disc Brakes provide reliable braking, stopping, holding, and tension control for cranes, conveyors, mining equipment, and industrial production lines. Designed for demanding environments, they deliver fast response, consistent braking force, and low maintenance requirements while supporting OEM customization for global industrial projects.
Product Series Available
QP Series
Spring-applied, pneumatic-release
Fail-safe braking function
Suitable for lifting and safety-critical applications
semiconductor
Pneumatic-applied, spring-release
Ideal for process control and tension control systems
Suitable for continuous industrial operations
QPL / CQPL Series
Compact installation design
Optimized for limited installation spaces
Available in multiple braking capacities
Customized Brake Solutions
Custom disc thickness compatibility
Customized mounting dimensions
Special anti-corrosion treatment
Project-specific braking torque requirements
OEM manufacturing support
Operating Conditions
Temperature: -5℃ to 40℃ .
Working Pressure: 5–7 bar (QP series); ≤ 7 bar (CQP series).
Environmental & Air Supply Specifications: Anti-corrosion models are required for applications exposed to outdoor rain, snow, corrosive gases, or media. The air supply must be free from oil, water, and other contaminants.
Model Designation Explanation
External Dimensions of QP12.7 (CQP12.7) Series
Technical Parameters of QP12.7 Series
| Model | Rated braking force (N)(Eight springs) | Effective radius of brake disc(m) | Braking torque(N.m) | Working gas capacity(cm³) | Total gas capacity(cm³) | Weight(kg) |
| QP12.7-A | 6400 | Brake disc radius -0.03 | Rated braking force ×Effective radius | 273 | 553 | 24 |
| QP12.7-B | 4800 | 140 | 293 | 20 |
Technical Parameters of CQP12.7 Series
| Model | Rated braking force (N)(Eight springs) | Effective radius of brake disc(m) | Braking torque(N.m) | Working gas capacity(cm³) | Total gas capacity(cm³) | Weight(kg) |
| CQP12.7-A | 1788 × working pressure | Brake disc radius -0.03 | Rated braking force ×Effective radius | 273 | 553 | 23 |
| CQP12.7-B | 1055 × working pressure | 140 | 293 | 19 |
External Dimensions of QP12.7-C Model
Technical Parameters of QP12.7-C Model
| Model | Rated braking force (N)(Eight springs) | Effective radius of brake disc(m) | Braking torque(N.m) | Working gas capacity(cm³) | Total gas capacity(cm³) | Weight(kg) |
| QP12.7-C | 6400 | Brake disc radius -0.03 | Rated braking force ×Effective radius | 273 | 553 | 25 |
External Dimensions of QPL (CQPL) 12.7A Model
Technical Parameters of QPL 12.7A Model
| Model | Rated braking force (N)(Eight springs) | Effective radius of brake disc(m) | Braking torque(N.m) | Working gas capacity(cm³) | Total gas capacity(cm³) | Weight(kg) |
| QPL12.7A-A | 6400 | Brake disc radius -0.03 | Rated braking force ×Effective radius | 273 | 553 | 24 |
| QPL12.7A-B | 4800 | 140 | 293 | 20 |
Technical Parameters of CQPL 12.7A Model
| Model | Rated braking force (N)(Eight springs) | Effective radius of brake disc(m) | Braking torque(N.m) | Working gas capacity(cm³) | Total gas capacity(cm³) | Weight(kg) |
| CQPL12.7A-A | 1788 × working pressure | Brake disc radius -0.03 | Rated braking force ×Effective radius | 273 | 553 | 23 |
| CQPL12.7A-B | 1055 × working pressure | 140 | 293 | 19 |
External Dimensions of QPL (CQPL) 12.7-B Model
Technical Parameters of QPL 12.7-B Model
| Model | Rated braking force (N) | Effective radius of brake disc(m) | Braking torque(N.m) | Working gas capacity (cm³) | Total gas capacity(cm³) | Weight(kg) |
| QPL12.7-B | 2100 | Brake disc radius -0.03 | Rated braking force ×Effective radius | 140 | 293 | 11 |
Technical Parameters of CQPL 12.7-B Model
| Model | Rated braking force (N) | Effective radius of brake disc(m) | Braking torque(N.m) | Working gas capacity (cm³) | Total gas capacity(cm³) | Weight(kg) |
| CQPL12.7-B | 416 × working pressure | Brake disc radius -0.03 | Rated braking force ×Effective radius | 140 | 293 | 10 |
External Dimensions of CQP20-D Model
Technical Parameters of CQP20-D Model
| Model | Rated braking force (N) | Effective radius of brake disc (m) | Braking torque(N.m) | Working gas capacity (cm³) | Total gas capacity(cm³) | Weight(kg) |
| CQP20-D | 6097 × working pressure | Brake disc radius -0.065 | Rated braking force ×Effective radius | 1400 | 3000 | 68 |
External Dimensions of CQP [ ] B Model
Technical Parameters of CQP [ ] B Model
| CQP10B-A | Rated braking force (N) | 3725 | 5415 | 7150 | 8940 | 10680 | Effective radius of brake disc (m) | Rated braking force N.m |
| Air pressure (bar) | 2 | 3 | 4 | 5 | 6 | |||
| CQP10B-B | Rated braking force (N) | 2110 | 3165 | 4220 | 5275 | 6330 | ||
| Air pressure (bar) | 2 | 3 | 4 | 5 | 6 | |||
| CQP10B-F | Rated braking force (N) | 1065 | 1600 | 2133 | 2665 | 3200 | Brake disc radius -0.03 | Rated braking force ×Effective radius |
| Air pressure (bar) | 2 | 3 | 4 | 5 | 6 |
External Dimensions of CQP [ ] B Model
Unit:mm
| SizeModel | B | D | E | F | ΦG | H | I | J | K | Φd | Φd1 |
| CQP10B-A | 220 | 155 | 10 | 181 | Φ190 | 310 | 35.5 | 80 | 40 | Φ14 | G3/8" |
| CQP10B-B | 200 | 155 | 10 | 181 | Φ150 | 290 | 35.5 | 80 | 40 | Φ14 | G3/8" |
| CQP10B-F | 180 | 155 | 10 | 181 | Φ114 | 280 | 35.5 | 80 | 40 | Φ14 | G1/4" |
Technical Parameters of CQP20B Model
| CQP20B-A | Rated braking force (N) | 3725 | 5415 | 7150 | 8940 | 10680 | Effective radius of brake disc (m) | Rated braking torqueN.m |
| Air pressure (bar) | 2 | 3 | 4 | 5 | 6 | |||
| CQP20B-B | Rated braking force (N) | 2110 | 3165 | 4220 | 5275 | 6330 | ||
| Air pressure (bar) | 2 | 3 | 4 | 5 | 6 | |||
| CQP20B-F | Rated braking force (N) | 1065 | 1600 | 2133 | 2665 | 3200 | Brake disc radius -0.03 | Rated braking force ×Effective radius |
| Air pressure (bar) | 2 | 3 | 4 | 5 | 6 |
External Dimensions of CQP20B Model
| SizeModel | B | D | E | F | ΦG | H | I | J | K | Φd | Φd1 |
| CQP20B-A | 220 | 165 | 20 | 192 | Φ190 | 310 | 39 | 90 | 40 | Φ14 | G3/8" |
| CQP20B-B | 200 | 165 | 20 | 192 | Φ150 | 290 | 39 | 90 | 40 | Φ14 | G3/8" |
| CQP20B-F | 180 | 165 | 20 | 192 | Φ114 | 280 | 39 | 90 | 40 | Φ14 | G1/4" |
Technical Parameters of CQP38B Model
| CQP38B-A | Rated braking force (N) | 3725 | 5415 | 7150 | 8940 | 10680 | Effective radius of brake disc (m) | Rated braking torqueN.m |
| Air pressure (bar) | 2 | 3 | 4 | 5 | 6 | |||
| CQP38B-B | Rated braking force (N) | 2110 | 3165 | 4220 | 5275 | 6330 | ||
| Air pressure (bar) | 2 | 3 | 4 | 5 | 6 | |||
| CQP38B-F | Rated braking force (N) | 1065 | 1600 | 2133 | 2665 | 3200 | Brake disc radius -0.03 | Rated braking force ×Effective radius |
| Air pressure (bar) | 2 | 3 | 4 | 5 | 6 |
External Dimensions of CQP38B Model
| SizeModel | B | D | E | F | ΦG | H | I | J | K | Φd | Φd1 |
| CQP38B-A | 220 | 200 | 38 | 230 | Φ190 | 310 | 39 | 90 | 40 | Φ14 | G3/8" |
| CQP38B-B | 200 | 200 | 38 | 230 | Φ150 | 290 | 39 | 90 | 40 | Φ14 | G3/8" |
| CQP38B-F | 180 | 200 | 38 | 230 | Φ114 | 280 | 39 | 90 | 40 | Φ14 | G1/4" |
External Dimensions of QP (CQP) 30 (25.4)-D Model
Technical Parameters of QP 30 (25.4)-D Model
| Model | E | Rated braking force (N)(12 springs) | Effective radius of brake disc (m) | Rated braking torque(N.m) | Working gas capacity (cm³) | Total gas capacity(cm³) | Weight(kg) |
| QP30-D | 30 | 32800 | Brake disc radius -0.065 | Customized power xEffective radius of brake disc | 1400 | 3000 | 70 |
| QP25.4-D | 25.4 |
Technical Parameters of CQP 30 (25.4)-D Model
| Model | E | Rated braking force (N) (12 springs) | Effective radius of brake disc (m) | Rated braking torque(N.m) | Working gas capacity (cm³) | Total gas capacity(cm³) | Weight(kg) |
| QP30-D | 30 | 32800 | Brake disc radius -0.065 | Customized power xEffective radius of brake disc | 1400 | 3000 | 70 |
| QP25.4-D | 25.4 |
External Dimensions of CQPL 38B Series Brakes
Technical Parameters of CQPL 38B Series Brakes
Unit:mm
| CQPL38B-A | Rated braking force (N) | 3725 | 5415 | 7150 | 8940 | 10680 | Effective radius of brake disc (m) | Rated braking torque(N.m) |
| Air pressure (bar) | 2 | 3 | 4 | 5 | 6 | |||
| CQPL38B-B | Rated braking force (N) | 2110 | 3165 | 4220 | 5275 | 6330 | Brake disc radius -0.03 | Rated braking torque ×Effective radius |
| Air pressure (bar) | 2 | 3 | 4 | 5 | 6 | |||
Industrial Application
Port & Crane Machinery: Emergency windproof and safety braking for gantry cranes, overhead cranes, and hoists.
Mining & Conveyors: Reliable safety braking for heavy-duty material handling and belt conveyor systems.
Processing Lines: Ultra-precise, continuous tension control for steel plate, cable, and paper processing industries.
Quality Control and Safety Assurance
As an essential safety component in heavy-duty machinery, every Xuda pneumatic caliper disc brake undergoes a rigorous, multi-stage quality control protocol to guarantee zero-failure performance under extreme operating conditions.
Certified Manufacturing Standards: Our entire production facility operates strictly under the ISO9001:2015 Quality Management System, ensuring full traceability from raw steel casting to final assembly.
100% Non-Destructive Testing (NDT): All load-bearing caliper frames undergo Non-Destructive Testing (NDT) to eliminate internal defects and micro-cracks before machining.
Rigorous Pressure & Leakage Testing: Every pneumatic cylinder is subjected to a sustained 10-bar pressure test (exceeding the standard 7-bar working limit) to guarantee absolute air-tight sealing and prevent pressure drops in the field.
Fatigue & Torque Verification: Randomly selected batch samples are placed on our proprietary dynamic test rigs to verify consistent torque output, precise spring reaction times, and lining wear durability.
Eco-Friendly Compliance: We source only certified 100% asbestos-free friction linings, meeting strict international environmental and occupational health safety standards.
Pre-Shipment Inspection (PSI): Every brake is treated with industrial anti-rust coatings, visually checked for dimensional accuracy, and securely packed to withstand long-distance maritime transit.
Sourcing Guide
Production Lead Time: Standard catalog models are kept in stock for immediate shipment. Customized mounting configurations or marine-paint models require 2–3 weeks.
Export Packaging Guarantee: All calipers are treated with anti-rust oil, wrapped in heavy-duty vapor corrosion inhibitor (VCI) plastics, and packed into international export-standard seaworthy plywood cases.
Technical Support Assets: 2D dimension prints, full-scale schematic drawings, and 3D CAD files (.STEP/.IGS) are available instantly upon submission of your inquiry form below.
FAQ
Q: What is the difference between QP and CQP pneumatic disc brakes?
A: QP brakes are spring-applied and air-released, providing fail-safe braking during air pressure loss. CQP brakes are air-applied and spring-released, making them suitable for process control applications.
Q: Can the brakes be customized for special disc sizes?
A: Yes. Disc thickness, mounting dimensions, braking force, and structural configurations can be customized according to project requirements.
Q: What industries commonly use pneumatic caliper disc brakes?
A: They are widely used in cranes, mining equipment, ports, conveyors, steel processing lines, paper machinery, cable manufacturing systems, and automated production equipment.
Q: What type of compressed air is required?
A: The air supply should be clean, dry, and free from oil, water, and contaminants to ensure reliable operation and long service life.
Q: Are anti-corrosion versions available?
A: Yes. Special anti-corrosion models can be supplied for outdoor installations and harsh environments exposed to rain, snow, humidity, or corrosive media.
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