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Compel Groupgroup

Hydraulic Fittings

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Hydraulic fittings are the crucial components that connect hoses, tubes, and pipes within a hydraulic system. Used across industrial maintenance and machinery manufacturing, these connectors and adapters ensure a secure, leak-free flow of hydraulic fluid under pressure. They are fundamental for repairing or building hydraulic circuits in heavy equipment, production lines, and processing plants.

Compel offers a focused selection of stainless steel hydraulic fittings, primarily in grade 304. Our range includes common thread types like BSP and NPT, and connection styles such as compression, push-in, and hose barb. This curated offering provides durable, corrosion-resistant solutions for many standard industrial hydraulic applications.

Choose Your Connection: Compression, Push-In, or Barb

The type of connection is your first decision. It depends on the tube or hose you are connecting.

Compression fittings are ideal for joining sections of rigid metal tubing. They create a strong mechanical seal by compressing a ferrule onto the tube's outer diameter. Hose barb fittings feature a tapered, ridged shank that inserts into a flexible hose and is typically secured with a clamp. For applications requiring frequent disconnection and reconnection, quick-release push-in fittings offer a fast and simple solution.

Match Thread Standards: NPT, BSP, and JIC Fittings

Identifying the correct thread standard is to prevent leaks. North American systems often use NPT (National Pipe Taper) threads, which seal along the tapered threads. BSP (British Standard Pipe) is common internationally and comes in two forms: BSPT (tapered) and BSPP (parallel). BSPT seals on the threads, while BSPP requires a bonded seal or O-ring on a shoulder to create a seal.

While our selection is centered on NPT and BSP hydraulic connectors, another common standard is JIC (Joint Industry Council), which uses a 37-degree flare for sealing. Always confirm the thread type and size of your existing components before ordering. Our fittings are available in a variety of standard sizes.

Material Selection: The Role of 304 Stainless Steel

Our hydraulic fittings are made from 304 stainless steel. This material provides good corrosion resistance against many hydraulic fluids and is suitable for general industrial environments. Its strength and durability make it a reliable choice for high-pressure hydraulic systems.

While 304 stainless steel performs well in many conditions, it is important to verify its compatibility with specific or aggressive chemicals and extreme service environments. For applications with unique fluid types or exposure to harsh elements, always confirm that 304 stainless steel meets your project's material requirements.

Buying guide

Choosing Hydraulic Fittings

What is the main difference between NPT and BSP threads?
NPT threads are tapered and seal on the thread flanks, common in North America. BSP threads can be tapered (BSPT) or parallel (BSPP); parallel BSPP threads are more common globally and require a separate seal like a washer or O-ring to prevent leaks.
How do I measure for the correct hydraulic hose fittings?
For flexible hoses, you need to match the fitting's barb size to the hose's Inner Diameter (ID). For rigid tubing, you must match the compression fitting size to the tube's Outer Diameter (OD). Always measure accurately to ensure a secure seal.
What are hydraulic adapters used for?
Hydraulic adapters are used to solve connection mismatches. They can join components with different thread standards (e.g., NPT to BSP), connect different sizes, or change the direction of a hydraulic line with an elbow or tee fitting.
Is 304 stainless steel suitable for outdoor hydraulic systems?
304 stainless steel offers good corrosion resistance for general outdoor use. However, for environments with high salinity, such as marine or coastal applications, a higher-grade stainless steel like 316 is often recommended for its superior resistance to chloride corrosion.
Are your hydraulic fittings CE certified?
Certification varies by product. Some fittings may carry a CE mark while others do not. You must check the datasheet on the specific product page to verify its certification status and ensure it meets your project's compliance requirements.
What is a common mistake when installing hydraulic connectors?
Over-tightening is a frequent error, especially with compression and flared fittings. It can deform the threads, damage the sealing surfaces, or even crack the fitting, leading to system failure. Always follow torque specifications where provided.