In an ever-changing world, it is hard to ignore the increasing amount of foreign threaded connections in the hydraulic industry. Whether it is in a port connection, to a hydraulic hose, even lubrication and grease fittings, they seem to be in all areas of a hydraulic application. Understanding foreign threaded connections can be very cumbersome, and confusing! But being able to understand, and more importantly identify foreign threads can make the difference on whether a customer purchases from you again or goes to the competition.
With the increased amount of goods purchased from over-seas manufacturers, it only makes sense that those goods will have foreign threaded connections. Essentially, there are only three countries that still use the Imperial System; The United States of America, Liberia, and Myanmar (formerly known as Burma). So, it’s no wonder why foreign threads are more prevalent than ever in the hydraulic industry. Here is a list of the most common Foreign threads in the Hydraulic Industry.
The two types of British Threads are, Parallel (BSPP) and Tapered (BSPT). British Parallel threads are commonly referred to as a “G” thread, whereas British Tapered threads are referred to as “R” thread. They are measured in Nominal Sizes, and the threads are measured in Threads per Inch.
There are three sealing methods to a BSPP thread. This thread can seal using the BS 5200 60° Cone-Seat, which is like how a NPSM thread will seal, with an external Gasket, or the ISO 1179 O-Ring. These gaskets can include Bonded Seals, O-Ring and Washer combination, and Elastomeric Seals. The O-Ring Only Style is exclusive and will only seal with the correct size O-Ring, like the SAE J514 Straight Thread O-Ring Boss.
The British Tapered threads are only intended to seal on the flanks of the threads, like how a NPT thread seals, and are generally seen on lower pressure, or schedule pipe, applications.
Metric (DIN) Threads
There are also two styles of Metric Threads, Parallel or Tapered. Metric threads are measured, in millimeters, on the outside diameter and pitch of the threads. Generally, there are 3 thread pitches in metric fittings, pertaining to the hydraulic industry; 1.0, 1.5, and 2.0.
Just like the British Parallel threads, Metric Parallel threads can seal in one of three ways. Either, it can seal on the 24° Tube Seat, like an Ermeto® fitting, it can seal with an external gasket, or with the ISO 6149 O-Ring. The external gaskets are alike to the British Parallel style Bonded Seals, O-Ring and Washer combination, and Elastomeric Seals, ignoring the true size of the seal. The ISO 6149 O-Ring Only style is exclusive and will only seal using the correct O-Ring, like the SAE O-Ring Boss style previously explained.
Metric Tapered threads are generally seen in low pressure, and lubrication applications. They are intended to seal on the flanks of the threads, like NPT threads.
Japanese (JIS) Threads
Japanese threads, or JIS, are easy to understand. They are nominally sized, and the threads are measured in Threads per Inch. JIS threads are the exact same size, pitch, and thread count as British threads. The only difference is that JIS has a 30° outward flare, similar to the 37° flare that we see on JIC fittings. There are more Japanese threads that exist in hydraulic systems, but to keep things as “easy” as possible, we will not go over those at this point.
If this isn’t confusing enough, Komatsu threads tie in Metric thread pitch along with the JIS 30° flare. Komatsu threads are only ever used on Komatsu made machinery. Which is why when identifying threads, it never hurts to ask what kind of machine that the thread originates from.
TCH Industries: Hose, Fitting, & Sealing Experts
The highly trained sales staff at TCH Industries has been dealing with foreign threads for over three and a half decades. By partnering with world-class suppliers of fittings and adapters of every type, TCH has developed a top reputation for quality, reliability, exceptional service, and professionalism.
If you wish to receive a quote from TCH Industries for foreign accessories, please complete the easy-to-use online form that requests information about your needs in a simple questionnaire.
Best yet, for easy-to-understand answers from the hose and fitting pros at TCH, the solution is to visit in person the TCH Hose Center at 2307 East Aurora Road, Twinsburg OH, only 25 miles from the heart of Cleveland.
Twinhammer™ Dual Air/Water Jackhammer hose is a unitized, specially bonded dual air and water hose assembly designed to simultaneously transfer air to power jackhammers and water to suppress silica dust during tool operation. Series 7084 hose assemblies incorporate crimp couplings for durability and security, with universal end styles for quick connection/disconnection. Easy to handle and maneuver, these assemblies are an integral component of a silica dust suppression system to help meet the OSHA Respirable Crystalline Silica (RCS) Standard.
Twinhammer hose assemblies feature durable abrasion resistant and chemically bonded lines for easy handling. The design eliminates the need for intrusive clamps, straps, tape or zip ties used to cobble together a makeshift harness for independent air and water hoses. The assemblies incorporate universal end styles for quick connection/disconnection to the air supply, and rust resistant brass male NPT couplings for easy attachment to the water supply and spray nozzle.
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Hydraulic hoses of any type must meet very stringent standards to adapt to the pressure levels, loads, and sometimes contorted positions demanded of them. Few engineering components are expected to withstand the forces within and be flexible enough to bend or reach at varying angles to perform heavy-duty functions.
In simplest terms, a hydraulic system is one that uses highly pressurized hydraulic fluids to create mechanical output such as lifting, stamping, or forging. Hydraulics are commonly used for excavators and backhoes, wing flaps on airplanes, lifting equipment like jacks and wheelchair lifts, and much more.
Standard industrial hoses are not suitable for use in hydraulic systems. Hydraulic hoses, as part of an enclosed system, must be able to withstand average internal pressures averaging 3000 psi and withstand extreme temperatures.
Standards for Hydraulic Hoses
SAE, the standard-setting organization of engineers, has set standards for hydraulic hoses. Since these components are essential to efficient operations and, in many situations, human safety, hoses must meet specific requirements for a hydraulic system. SAE J517 provides general, dimensional, and performance specifications for hydraulic hoses in mobile and stationary systems.
The typical hose is composed of three layers. These include the inner tube, a reinforcing middle layer, and a protective outer layer.
The design and material used for the inner layer must be engineered to the level of flexibility required and the type of fluid to be used. Typically, the inner layer is produced from a form of synthetic rubber, thermoplastic, or a PTFE material.
The middle layer which largely determines the strength is made from coiled wire or a textile braiding that allows flexibility, yet is strong enough to withstand the extreme pressures of a hydraulic system at work.
The outer layer is a material that protects against foreign matter, extreme weather, abrasive tools, and sharp objects.
Fittings that attach the hydraulic hose to its source and destination must be sufficient to manage extreme pressure as well.
5 Types of Hydraulic Hoses
While there are more types and applications of hoses, the five listed here are a cross-section of specific components, uses, and capabilities:
- SAE Standard Hose: SAE 100R1 is a high-pressure hose is used with petroleum or water-based fluids designed to power general industrial applications. The hose is single steel, wire-braided tubing that will operate in temperatures ranging from -40°C to 100°C.
- Standard High-Pressure Hose: These hoses are flexible and used to transporting mineral and hydraulic oils and water-oil emulsions. They are in demand for the mining and oil industries, construction, and agriculture.
- Low-Pressure Hose: Textile-braided and highly flexible, these hoses are employed in lighter applications such as return lines, anti-static delivery lines, and air or lube lines. Low-pressure lines are not suitable for braking or other safety-related applications.
- Steel Wire-Braided Hose: Either single or double wire-braided and extra durable, these hoses are used to transport fluids under extreme pressures, temperatures, and even a vacuum. These hoses are used in oilfields, mining, and heavy industrial applications.
- Thermoplastic Hydraulic Hose: Useful for heavy construction, hydraulic lift equipment, and lubrication lines, the thermoplastic hoses are resistant to abrasion and can operate at very low temperatures. Both the inner and outer layers consist of a thermoplastic material while the middle layer reinforces with a synthetic fiber mesh.
Choosing the Right Hose
Hydraulic hoses might be at the core of your operation. Breakdowns can be expensive. Determining the best ones for your pressure capacity, durability, flexibility, abrasion resistance, temperature exposure, and the material to be conducted usually requires complex engineering considerations.
TCH Industries: Hose, Fitting, & Sealing Experts
In technical and industrial situations, a highly trained and certified professional from TCH Industries can come on-site to assess your situation and offer recommendations for process improvement that will enhance the flow and flexibility of your systems.
TCH Industries has been a leading supplier of top-quality hoses for hydraulic applications for over three and a half decades. By partnering with world-class suppliers of hoses and fittings of every type, TCH has developed a top reputation for quality, reliability, exceptional service, and professionalism.
To learn more about hoses and their application and inspection, visit the TCH Industries website at https://tchindustries.com/. If you wish to receive a quote from TCH Industries for new hoses and accessories, please complete the easy-to-use online form that requests information about your needs in a simple questionnaire.
Best yet, for easy-to-understand answers from the hose pros at TCH, the solution is to visit in person the TCH Hose Center at 2307 East Aurora Road, Twinsburg OH, only 25 miles from the heart of Cleveland.
Is it some sort of frequent shopper program for end users? Well….. yes and no. Yes because our end users that frequently buy from us realize the advantages and value TCH brings to the table over the course of time. These advantages include the high service levels we provide when it comes to delivery time and responsiveness to their inquiries, or they may have encountered a difficult application our experienced staff provided a solution that in the past had mystified our competitors. Typically our customers relationships become stronger over the course of time because of the quality solutions we provide for flow, flexibility, and sealing challenges they face in their process systems. These solutions translate into value for our customers and further solidifies our relationships in the marketplace. In conclusion, the TCH Advantage is the value we create for our customers with exceptional service levels and the ability to provide quality products and solutions to flow, flexibility and sealing applications in a timely manner. Please call us at 330-487-5155 to discover the TCH Advantage.