The Difference Between BSPP, BSPT and NPT Fittings
These are designed to provide more leak free seals without using sealants. They are the same shape but have adjusted crest and root heights. The male adaptors have taper threads that fit into the female adaptors forming a seal when twisted together. Tapered fittings are used mainly on the ends of pipes, nipples and fitting such as couplings, elbows and tees.
They are similar to the NPT but have angle cross threads of 55 degrees and have rounded peaks and valleys. BSPT fittings require sealants whereas the BSPP use banded seal rings to seal fittings in between the shoulder on the male and the face of the female and do not require sealants. Most definitely NOT. These fittings should never be mixed as this can lead to leakage and can be dangerous.
If your equipment is made anywhere else in the world then you should use BSP fittings. We have placed cookies on your device to help make this website better. Your order contains no items. Contact us on sales indanc. Catalogues Useful Articles Resources. Did You Know?
Sign Up to our Newsletter Sign Up. Contact Head Office sales indanc. Follow Us. Browse our online Sterling catalogue. Browse our online Euros catalogue. Request one to be sent out to you. To request one to be sent out to you, please fill in the form below.Am having a whale of a time trying to put together orders for plumbing for solenoid valves and so on.
BSP unless stated could be parallel or tapered - there may be a convention but the seller may not know that. Many fittings that use olives to seal will have a BSPP thread.
Would it be safer to avoid parallel mixed with tapered? Its for water at up to psi. Can I seal the joins with Araldite? I dont want to use anything like teflon tape, silicone or Loctites that might release tiny fragments. If a particle of debris blocked that 0. I have to be paranoid about dirt, although there will be several in-line filters.
Plan to use hose tails and teflon-lined rubber hose. So I can see the joints deteriorating before they do. Not keen on hidden olives. Never mix tapered and parallel, as for sealing the joints that's a lot of pressure, you need somebody that deals in commercial rather than domestic, but I've never heard of Araldite used in that way.
Am going to be cautious and use only water until I know it holds together against engine vibration and rocking. I'd use one of the specific thread sealing fluids from Loctite or similar rather than Araldite. That way you will be able to dismantle later if needed and will be just as effective.
A problem with Araldite is that it sets hard. When at some unspecified time in the future you unscrew the fitting, grains of Araldite will fall into the pipework.
My thinking was that whatever sealant I use, dismantling the joint will release particles of debris. So I might as well make the joint permanent and throw away the component if it fails. The nozzle is only 0. Please look up the spec for Loctite it contains no filler particles and will not release debris - it's in their spec. My tractor runs it's hydraulics at psi and the hydraulics needs to be similarly clean, the price of a new pump would mean re-mortgaging.
But the pipes do not need sealing, nor do they leak. Get good quality fittings and they seal correctly. Perhaps you are looking at automobile suppliers why not try a specialist supplier?Looking for a particular Fitting or Accessory?
Click here to try our Product Finder. I have found that my Japanese-built injection mold presses have predominantly BSP fittings. While the actual specified outside diameters of American National Pipe differ slightly from those of British Standard Pipe, either thread may reliably be cut onto a pipe of its respective trade size.
To determine pitch, use a thread gauge or count the number of threads that fall into a 1" span. Metric threads are usually specified in actual pitch, e. This is the actual length of each thread, peak to peak. Disclaimer: Links to sources of products are offered with no review or qualification of said products on the part of PipeandHose.
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You must find the I. 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. Mar Works great.
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Nov So you finally found the right solenoid valve to replace your broken one.
ORB X BSPP
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.
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. 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. Gather the information from the previous steps and compare it with the measurements in the tables below.
You can also download all this information in a convenient PDF file. Download the Thread Identification Guide. Note: Due to variations in manufacturing the thread diameter may not match exactly with the measurements below.
This thread type is most commonly used in North America. When torqued the flanks of the threads compress against each other forming a leak-tight seal. However, it is still recommended to use PTFE tape or another sealant compound to guarantee a completely leak-tight seal.
It ensures an even more leak-free seal.Teesing Chinainfo teesing. Do you need more information about thread types or are you looking for a special solution?
Proceed Cancel. Teesing USA Tel. Visit the online catalog. Application solutions Customer stories Engineering cases.
While one sealing style is not inherently better than another each style has its application. They seal due to the "out of roundness principle" which means that the male stretches the female fitting until there is so much force that the connection can hold pressure.
One of the challenges with this design is that if you connect stainless steel to stainless steel then over-tightening or poor lubrication can cause gauling and damage to the threads.
Thread sealant is needed to seal but only 2 turns of thread sealant is required. Any more than that and the seal can leak around the thread sealant. The angle across the flanks of threads if you sliced the fitting in half long-ways and measured the angle from root to crest to root is 55 degrees instead of 60 degrees as it is for NPT. This is a popular fitting in China and Japan but is very rarely used in North America unless the equipment to which it is attached was imported.
Thread sealant is needed to seal the male and female fitting together. It is a parallel thread fitting that uses a bonded seal ring to do the sealing.
G/R/RP - WITHWORTH THREAD (BSPP/BSPT)
This bonded ring seal is sandwiched in-between a shoulder on the male fitting and the face of the female fitting and is squeezed in place.
BSPP pressure gauges have a longer male thread and use a copper crush washer that is squeezed in between the bottom of the male fitting and the bottom of the female BSPP hole forming a pressure tight seal. No thread sealant is needed to form a seal.