Understanding Foreign Threads in the Hydraulic Industry

 

 

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.

 

British Threads

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.

 

Komatsu Threads

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.

Identifying the Right Hydraulic Hose for Your Application

Hydraulic hoses must be durable and long-lasting enough to handle the needs of the particular function. Hydraulic hoses, unlike many other industrial hoses, need substantial reinforcement to endure the significant pressures that are necessary to perform their job. Reinforcing support can come in many forms depending on the levels of pressure, materials, and other factors that the hose will be required to withstand.

Consider STAMPED When Selecting Hydraulic Hoses

When determining which hydraulic hoses and fittings will be right for your situation, TCH Industries of Twinsburg, Ohio, suggests considering the acronym “STAMPED.” Seven questions cued by each letter will help identify which hydraulic hose is right for your situation. These are:

  • S: Size and diameter of the hose. Not only does this refer to the internal diameter of the hose but also to the required length from port to port.
  • T: Temperature refers to the maximum and minimum temperatures that the hose will withstand during all parts of the process.
  • A: Applications refers to the actual use of the hose and equipment. Will this be for industrial use or injection molding, for example.
  • M: Media refers to the liquid, gas, or solid that will be conveyed. Different medias require different levels of strength to accommodate what will be moving within.
  • P: Pressure is a critical variable in hydraulics. Pressure is the force that moves and lifts, so factoring the degree of pressure that the hose will need to withstand is essential.
  • E: Ends of the hose will be determined by where the hose will connect. The origination and destination ports may be different so the assembly might require different connecting hardware.
  • D: Delivery dates may be requested. These may depend on testing, certification requirements and, perhaps, custom production times.

Dealing with High Pressure

Hydraulic hoses, more than any other, are expected to withstand higher-than-normal pressure while in full operation. As a result, added reinforcement becomes mandatory.

TCH Industries offers hydraulic hoses that can withstand up to 10,000 psi, working pressure, as well as other hoses, fittings, and accessories for low and medium pressure scenarios.

The type and degree of reinforcement are calculated by the working pressure of the hydraulic system. As the pressure increases, the PSI rating of the hose must increase as well.

Most hydraulic hose reinforcement material may be one of three types, although combinations of these are often used to bolster the pressure capacity. These materials are:

  • Braided synthetic textiles, wire, and other materials set in a crisscross, overlapping pattern that allows for flexibility and maximum strength.
  • Spiral Wrapping with wire, textiles, synthetic materials consisting of parallel, rather than overlapping reinforcement. This pattern strengthens the hose while allowing for lower flexibility.
  • Helical coil (a helix pattern) strengthens the hose to prevent it from collapsing inside when suction or a vacuum is applied. The coil is often used in conjunction with the braided textile reinforcement to manage both high and low-pressure situations.

Check with TCH Industries

For questions about any hydraulic or industrial hose applications, check out the TCH Industries website. For the past three decades, TCH Industries has helped many manufacturers, construction businesses, petrochemical companies, agricultural concerns, food processors, brewers, and others to solve their hydraulic and industrial hose requirements.

As members of the National Association of Hose and Accessories Distribution, the TCH employees adhere to ISO 9001-2015 Standards and possess the engineering expertise for any job.

If you should be in the Northern Ohio Region, stop by the TCH Hose Center at 2307 East Aurora Road, Twinsburg, Ohio, to discuss your needs.

Alternatively, phone the professionals at TCH Industries at +1-330-487-5155.

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