Air tube clutch

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500/125 Oilfield Air Tube Clutch

This pneumatic clutch is a heavy-duty power transmission component widely applied in Chinese and international drilling rigs. Designed in accordance with oilfield standard requirements for drilling and well-servicing equipment, this clutch is engineered to engage and disengage rotary systems with smooth, controllable torque transfer. Its construction integrates an inflatable rubber air tube mounted between driving and driven plates(friction plates), allowing torque transmission through uniform radial expansion. This model designation indicates a clutch capable of handling demanding rotary torque and horsepower ranges, making it particularly suited for rotary tables, mud pumps, and drawworks. With a proven track record in China’s oilfield equipment manufacturing factory, this clutch has been exported to multiple markets and is recognized for stable performance in both onshore and offshore operations.

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Product Specifications

Chinese Model	500/125
Temperature rating	-20°C to 70°C
Clutch Rim material	45# Steel(Equivalent to AISI 1045)
Air Tube material	Nitrile rubber (NBR)
Service life	Under normal operating conditions, the air tube typically lasts 1~3 years, the friction plate assemblies provides 3,000~5,000 working hours, while the steel rim can remain in service for more than 10 years; with proper maintenance, the overall service life of the clutch can be significantly extended.
Application	This pneumatic clutch is widely applied across the oil and gas drilling industry as a critical component of rig power transmission systems. Its primary applications include
Rotary Tables	Smooth torque delivery for stable drilling rotation.
Drawworks	Precise engagement and controlled braking during hoisting operations.
Mud Pumps	Reliable power transfer for high pressure fluid circulation.
Offshore and Onshore Rigs transmission system	Proven adaptability to extreme environments, including HPHT (high pressure, high temperature) conditions.
Third party witness and inspection report available	Bureau Veritas (BV), CCS, ABS, SJS etc.

Product Features

High Torque Transmission: Capable of reliably transmitting large torque loads, suitable for high power drilling applications.

Air-Controlled Engagement: Inflatable air bladder ensures progressive engagement and disengagement, reducing shock loads on the drivetrain.

Durable Construction: Fabric-reinforced rubber element with steel driving plates, engineered for long service life under continuous operation.

Serviceability: Modular design allows convenient replacement of friction elements and air tube without dismantling major assemblies.

Operational Safety: Built-in release mechanism prevents over inflation and ensures stable pressure control.

Compliance: Manufactured under oilfield industry standards and Chinese GB industry standards, ensuring global compatibility and interchangeability.

OEM Equivalent / Compatible Product Part Numbers

By combining a high strength structural design with ease of maintenance, the 500/125 pneumatic clutch offers drilling contractors a dependable solution that enhances rig uptime, reduces maintenance costs, and ensures compliance with international safety standards.

Product Details

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