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Fluid power hydraulics - parts, accesories

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Straight imperial-metric couplings

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Straight imperial-metric couplings (BSP/M)

Couplings intended mainly for connecting hoses or fitting (as long as it says fitting! )  

Imperial-metric connectors ( imperial-metric reduction ). The category contains threaded imperial-metric couplings and fittings. On one side English imperial BSP thread on the other side external metric thread with a cone. Connectors come in two versions : coupling - intended for connecting hydraulic hoses with nut ends ( this element can be used solely as a coupling ), coupling / fitting - this element on one side is equipped with a rubber washer and a special undercut ( can be used as a fitting e.g. screwed into manifold, cylinder or other element with an internal thread ) The coupling / fitting has a universal application because it allows use as a coupling for connecting hoses and as a fitting. Due to the fact that couplings allow for thread reduction, couplings in this category are also called reducing couplings. 

What are BSP-M imperial-metric couplings ?

BSP-M couplings are threaded fasteners used in hydraulic systems that allow connecting hydraulic hoses and other components with different thread standards – metric and imperial (BSP – British Standard Pipe). Thanks to them, it is possible to securely and tightly connect components made in different thread systems, which eliminates the need for additional adapters or converters. BSP-M couplings are characterized by precise workmanship and high resistance to pressure and mechanical loads. Their BSP imperial thread ensures a secure connection, while simultaneously allowing integration with components using metric threads. Thanks to their design, these couplings: Allow for connecting hydraulic system components operating in different thread standards. Ensure tightness and durability in high-pressure hydraulic systems. Are resistant to chemical and mechanical factors, making them suitable for demanding industrial conditions.

When and where imperial-metric couplings are used 

In what cases are BSP-M couplings useful ? Imperial-metric BSP-M couplings find application wherever it is necessary to connect hydraulic components with threads in different standards. They are particularly useful in the case of: Modernization and repair of existing installations, when different thread standards must be connected without replacing the entire system. Imported machines and equipment that use a different thread system than the standard used in a given region. Industrial hydraulic systems, where both hoses and components in the metric and imperial systems are used.  Where are BSP-M couplings used ? BSP-M couplings are widely used in industries requiring solid and tight hydraulic connections, such as: Hydraulic power – in drive systems, lifts, and hydraulic control systems. Automotive and transport – in hydraulic systems of heavy trucks, construction and agricultural machinery. Machine industry – in hydraulic installations of injection molding machines, hydraulic presses, and industrial equipment. Mining and heavy industry – where reliable hydraulic connections are required in difficult operating conditions.

Technical parameters 

  • Type : straight steel threaded connector 
  • thread type : on one side British imperial BSP on the other side metric 
  • purpose : connecting hoses ( coupling )  and fitting hoses to manifold cylinder ( fitting ) 
  • workmanship :  free-cutting steel zinc plated / stainless steel version available upon request  

Hydraulic reducing couplings 

In Hydron's offer you will find a wide selection of hydraulic reducing couplings, which are a basic element of every hydraulic system. These are BB type straight couplings, used to connect hoses and components with different thread diameters or different connection sizes. Thanks to their precision workmanship and solid construction, they guarantee a tight, durable, and safe connection in systems operating under high pressure. Hydron reducing couplings are products that meet the highest quality standards, used in industry, agriculture, construction, and in hydraulic power services.

What is a hydraulic reducing coupling ?

A hydraulic reducing coupling is a simple but extremely important element connecting two hoses or components with different thread diameters. Thanks to it, you can easily connect, for example, a hose with a 1/4" thread to an element with an M18x1.5" thread. In hydraulic power systems, imperial-metric reducing couplings play a key role — they enable flexible matching of installation components, while ensuring tightness and resistance to high operating pressures, often reaching several hundred bars.