So you finally found the right solenoid valve to replace your broken one. You call to check stock on the item and the sales rep asks you what thread type you need. Pneumatic components such as air cylindersvalvesand air preparation units come equipped with specific port threads. Choosing the correct thread type will ensure optimum compatibility with your equipment.
BSPP & BSPT Thread Identification Table
At a glance, threads may look similar. For example, G threads are not compatible NPT threads because of their differing angles, shapes, and thread pitches threads per inch. We have compiled a simple step-by-step guide to help you identify your thread type. We also encourage you to download this Thread Identification Guide for future reference because it will certainly come in handy.
A caliper is a useful tool that measures the outside diameter of a male thread and inside diameter of a female thread.
Using a caliper will give you the most accurate and precise measurements, but a straight steel ruler is a good alternative. A pitch gauge measures the threads per inch. For metric threads, this tool measures the distance between the threads. Take a look at where the threads are located.
It simply serves as a way to distinguish between the two connections. Next, determine if the thread is tapered or parallel. Tapered threads become narrower as they extend outward while parallel threads remain the same diameter.
Sometimes this characteristic can be determined through visual inspection, but if not a caliper can come in handy. Use the caliper to measure the first, fourth, and final full thread.TYPES OF THREADS -- THREAD TERMS -- ANGLE OF THREADS -- THREAD CHARTS --
These threads create a seal through metal-to-metal wedging or slight deformation of the threads. Parallel threads will often require an o-ring or thread tape to ensure a tight seal.
The next step in identifying your thread type is to determine the pitch size. While a ruler could be used to calculate the pitch size, a pitch gauge is highly recommended as pitch sizes can be very similar. Test a couple different sizes with a pitch gauge to find the best match. Using the caliper again, measure the outside diameter on a male thread and inside diameter on a female thread.
There will inevitably be small variations due to different manufacturers. The final step in identifying your thread type is to identify the thread type standard.British Pipe Standard fittings are amongst the most popular of all foreign threads in the world today. If it is a port application, an O-ring and washer or a bonded washer are needed to achieve a proper seal for parallel threads.
For tapered BSP threads, a seal is acquired via thread wedging with additional support from thread dope or Teflon tape. As previously mentioned, it is possible for a male BSPT tapered to thread into a female BSPP parallelso long as the female thread is fixed and not swivel this is because of the recessed cone seat.
BSP parallel fittings and their specifications can be identified by a completing few calculations. To find the thread size:. For example, a BSP parallel male thread measures out to O. Once you have the thread size, you then need to determine the number of threads per inch to verify that it is a BSP fitting. To determine the threads per inch count, you would undergo the same steps as for a parallel thread.
Using the O. However, the I. D inner diameter is a good reference point to start from. To determine the I. D of a BSP tapered fitting, simply obtain a caliper reading from inside the bore of the fitting. You can cross-reference the bore size on the followingchart with thread pitch and threads per inch to find your desired size and its related specifications. Japanese JIS tapered and parallel threads are identical to British standard pipe threads.
To find the thread size: Measure the O. Take the O. This is the number of threads per inch. Combine the thread size with the number of threads per inch and refer to the following chart to find your desired size and its related specifications.First of all, BSP and G, the two are not the same thing. Some literally translated into parallel pipe threads, Xiaobian feel a little wrong.
Corresponding to the other pipe thread called "taper pipe thread", which is the conventional name, but also the standard textbook title. If the translation of the British Pipe Parallel into a parallel pipe thread, it may make people feel a little touch of mind, and not professional enough, Standard. Historical reasons, BSPP and other different names. However, with the later ISO standard, these eight kind of Wuhua call all replaced with a simple letter.
This is the G thread. Letter G is the abbreviation of Gas that is, from the German Gewinde, "thread" means, small series tend to the formerbecause the first is used in the gas pipeline. And the reason why we call G pipe thread, because the G and tube Guan of the first letter of the alphabet the same reason, it is a coincidence.
G two screw with inner and outer threads for non sealing connection. The letter R comes from the German Rohr, meaning "tube". Sealed with cylindrical pipe thread Rp design and non - sealed tube thread G is completely consistent, the difference is that the accuracy of the thread.
The sealing of the taper pipe thread R on the basis of the cylindrical pipe thread according to the technical transformation of taper. From the above can be seen, simply that BSP refers to the G thread is not accurate.
General sealing thread with cylindrical tube Rp necessary sealing effect by adding sealing filler in the thread e. Not only that, general sealing pipe thread threaded and non sealing use and design tolerances for pipe threads are different, specific can see "metric, American and English standard thread standard manual". There's no such thing as a Baidu. In fact, the main reason of many mechanical processing enterprises usually encounter thread ring gauge test all qualified but is sealed bad situation in the process of BSP lies in the confusion of the thread seal with Rp internal threads and non sealed with G internal threads.
Recommendations concern the public number after reply BSP free download. For a more intuitive representation of the classification and the relationship between the BSP thread, but also to facilitate access, Xiao Bian specially made a BSP thread classification diagram as follows. It is easy to see the difference and connection between BSP thread and G thread.
Straight fluted tap Tap tap Spiral fluted tap Extrusion tap Twist drill. Company news Industry news Technical literature. Technical literature.The first step in thread identification is to determine whether the thread is tapered or parallel. Tapered means the thread walls, if continued lengthwise, would eventually meet.
Parallel means the thread walls are straight. A seal must be used for parallel fittings in PORT applications. Here are some of the different style seals for those PORT applications. The ability to properly identify seats, chamfers and their corresponding angles is a benefit to the fitting identification. To achieve a tube connection, a tube nut is tightened over the metric threads forcing a ferrule or cutting ring to grip the tube.
When the nut is securely fastened, the ferrule squeezes the tube which holds the tube in place. Essentially, face seal fittings seal between an O-ring located in the face of the straight male thread, and the flat face seat on the female thread.
After identifying if the threads are parallel or tapered, measure the thread pitch in millimeters over the top of the thread crests. This can be verified with a thread gauge. Use a calipers to measure the outside diameter OD of the threads. On taper threads it is important to place the calipers on the 3rd row of threads. Metric thread call out is the OD in millimeters followed by the pitch. BSP fittings can be identified by completing a few calculations to find the thread size.
Once you have the thread size, it is important to verify the pitch. The easiest way is to follow the following steps. Example: If you count 3. About Us HoseandFittings. Flared Seat verses Ball Seat The ability to properly identify seats, chamfers and their corresponding angles is a benefit to the fitting identification.
NPT & NPS Threads
Measuring Threads After identifying if the threads are parallel or tapered, measure the thread pitch in millimeters over the top of the thread crests.
Thread sealant tape is recommended for a leak free connection. The female has a straight thread and a tapered ball or cone seal seat.
The seal takes place between the chamfer of the male and ball or cone of the tapered seal flareless swivel. The threads hold the connection mechanically.
The female port has a straight metric thread, a machined surface and a chamfer to accept the O-Ring. The seal is created by compressing the O-Ring into the chamfer.Pipe Threads. These metric pipe thread sizes have been adopted by the ISO International Standards Organizationand are primarily intended for pipes or tubes for screwing together or into ISO pipe ports on valves, cylinders, pumps, and other components. An appropriate thread sealant can be used, if necessary, to ensure pressure-tight joints.
However, except on very small ports, straight threads with O-ring seal may be preferred to pipe threads as component ports. Straight thread ports are shown on the back side of this sheet. ISO metric machine threads should be used instead of pipe threads for mechanical fastenings such as bolts and nuts. Pitch the distance between threads is expressed as the number of threads per As with NPT threads, the nominal size does not represent true outside pipe diameter but in the larger sizes it comes very close.
Usually a thread sealant is required. There are two variations of ISO pipe threads. Parallel threads also called straight threads and taper threads. Taper threads have a taper and the same reamers can be used as for NPT threads. Reamers are not strictly necessary but in the larger sizes they enable a better thread to be produced. ISO pipe threads, when specified, are assumed to be parallel unless a taper thread is called out.
Taper threads seal on the threads themselves. Parallel threads, if a leaktight fluid seal is required, seal with a gasket, washer, or O-ring against the female seat. Since there is only one thread pitch, the thread pitch is usually not specified and they are called out only by nominal size as noted below. These specifications give information on thread form, machining dimensions, and tolerances. Information on inspection and gauging is in Part 2 of the same specifications.
Simply obtain a caliper reading from inside the bore of the fitting. You can cross-reference the bore size on the following chart with thread pitch and threads per inch to find your desired size and its related specs. Be the first to hear about new products and promotions:. Home British Standard Pipe. Very good communication. May Only place on the net to get hard to find fittings.
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NPT & NPS Threads