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Choosing the Right Hydraulic Fitting: A Comprehensive Guide

Hydraulic Repair Near Me Hydraulic hoses come in various colors and styles, making the choice of the correct hydraulic fitting a crucial decision. This guide, updated on June 20, 2019, and readable in 3 minutes, simplifies the complex world of hydraulic fittings. We delve into the seven most common types of end connections and their suitability for your project.

  • O Ring Face Seals: Ideal for different hydraulic hose types or flanged tubing, these fittings feature a flat sealing surface with an embedded seal. They are excellent for preventing leaks and over torqueing, offering high pressure resistance and good vibration resistance. Plus, they are easy to install and highly reliable.
  • Inch Compression: This bite-type fitting is suitable for hydraulic tubing, with limited hose connections.It’s not difficult to put together Hydraulic Repair Near Me hydraulic hard tubing and needs only a few tools for the process, which makes sure you have an easy process. 
  • JIC 37⁰ Flares: A prevalent style in hydraulic connections, the JIC fitting has parallel threads and a 37⁰ flare. It connects well to hose fittings or flared tubes, providing strong pressure, seal reliability, reusability, and resistance to vibration.
  • O-Ring Boss: Differing from the JIC’s metal-to-metal flare seal, the O-Ring Boss seals on an O-ring, offering a leak-free connection. It also boasts excellent pressure and seal reliability, good vibration resistance, and ease of installation.
  • Metric Din Hydraulic Fittings: Widely used in Europe, these fittings are compatible with a range of hose fittings and are ideal for metric-sized tubing. Their reusability makes them a popular choice.
  • NPT Pipe Threads: A century-old design, these classic tapered thread fittings come in brass or low-pressure black iron. They are usually used in the pneumatic systems, hydraulic systems, and are known to be easily installed. 
  • Four-Bolt Flange: Meeting SAE J518 and ISO standards, this leak-free component is suitable for tight spaces and high pressures. It offers excellent vibration resistance and seal reliability, making it a reliable choice.

When selecting a hydraulic hose fitting, consider these factors:

  • Pressure Rating: O-ring face seals are increasingly preferred for high-vibration applications due to their safety and efficiency.
  • Versatility: Reusability is key. JIC fittings are highly versatile, offering vibration resistance and reliability.
  • The Project: Consider the application’s requirements, including temperature, media, pressure, and component availability. O-ring face seals and DIN metric fittings are generally readily available.
  • Reliability: The most available component isn’t always the most reliable. For instance, while JIC fittings are widely used, they may cause cracked flares. DIN fittings and O-ring face seals, on the other hand, offer greater reliability and reduced risk of over-torqueing.


Identifying BSP and JIC Threads

BSP (British Standard Pipe) Threads:

Often calledHydraulic Repair Near Me threads, BSP fittings seal through either metal-to-metal angled surfaces or a combination of metal-to-metal and an O-ring. The sealing surfaces are angled at 60°. BSP threads are categorized into two main types: British Standard Pipe Parallel (BSPP) and British Standard Pipe Tapered (BSPT). To identify them, measure the thread’s outside diameter and count the number of threads per inch (25.4 mm).

JIC (Joint Industry Council) Threads:

JIC fittings, also known simply as JIC, have a 37° flare for their sealing surface and use straight United National Fine (UNF) threads. These fittings, originally specified by the Society of Automotive Engineers (SAE), are the most widespread American fitting type found in Europe. They are characterized by their metal-to-metal sealing mechanism.

Flange Thread Types: Code 61 and Code 62

Code 61 Flange Thread:

The 4-bolt split flange (also known as a full flange) is a globally used fitting for connecting high-pressure hoses, typically in applications involving pumps, motors, and cylinders that endure significant pressure. These flange fittings use an O-ring compressed against the flange head and the surface of the port or connection to create a seal. They are classified into two pressure categories: 3000 psi (SFL) and 6000 psi (SFS). The market also offers specific flanges from brands like Komatsu® and CATERPILLAR®.

Code 62 Flange Thread:

Similar to Code 61, the Code 62 4-bolt split flange is widely employed for connecting high-pressure hoses in Hydraulic Repair Near Me systems with heavy pressure loads, such as those in pumps, motors, and cylinders. The sealing is achieved by compressing an O-ring between the flange head and the port or connection surface. These fittings are also categorized into 3000 psi (SFL) and 6000 psi (SFS) classes. As per ISO 12151-3 standards, Code 62 refers to flanges designed for 6000 psi applications. Additionally, the market includes custom flanges designed by companies like Komatsu® and CATERPILLAR®.


Hydraulic Connector Types and Identification Guide

Hydraulic connectors, as their name implies, are essential for connecting hydraulic circuits. They link two different end terminations, allowing for fluid transfer and creating a flow passage.

These connectors are categorized into three primary types:

  • Internal Thread
  • External Thread
  • No Thread

Internal and external threads are often referred to as female and male connectors, respectively.

Different thread standards exist, largely based on the region of origin. Common standards include BSP (British Standard Pipe), NPT (National Pipe Tapered), UN (Unified Inch Screw Threads), and Metric.

Selecting the proper Hydraulic Repair Near Me thread type is paramount in preventing damage to systems of hydraulic nature. 

Variations in Fitting Designs for Thread Identification:

  • Tapered vs. Parallel Threads: Tapered threads (like BSPT and NPT) differ from parallel threads (such as BSPP and UN) in design. Tapered threads are crafted to seal on the thread surface itself.
  • Sealing Methods in Hydraulic Repair Near Me Hydraulic Connectors: Connectors may use metal seals or soft seals. Metal seals, with machined cone seats (either convex or concave), ensure a tight seal under pressure. Soft seal connectors, using elastomeric seals, are typical in port-use adaptors, where a soft seal at the base of the adaptor interfaces with a port’s flat surface.

In today’s dynamic environment, the Hydraulic Repair Near Me hydraulic industry is witnessing a growing presence of foreign threaded connections. These connections are ubiquitous, appearing in various applications such as port connections, hydraulic hoses, and even in lubrication and grease fittings. Navigating through the complexities and nuances of foreign threaded connections can be challenging, yet crucial. The ability to accurately identify and understand these foreign threads can significantly influence customer loyalty and their decision to either continue business with you or turn to competitors.