What are BSP pipe fittings?
British Standard Pipe (BSP) is a set of technical standards for screw threads that has been adopted internationally for interconnecting and sealing pipes and fittings by mating an external (male) thread with an internal (female) thread.
How do you identify BSP fittings?
How to Measure Your BSP Fittings
- Measure the outer diameter (OD) of the thread (in inches)
- Then subtract 25% from this (¼ inch)
- You’ll then need to make sure it is a BSP fitting so by counting the threads on your coupling, perhaps only just over ¼”, you can just multiply this by four to find the threads per inch.
Can you fit NPT to BSP?
NPT and BSP threads are generally not compatible due to the differences in their thread forms. NPT and BSP thread pitches (threads per inch, TPI) are listed below. You can use 1/2″ and 3/4″ NPT and BSP fittings together, but all others will be incompatible and will therefore leak.
Do BSP fittings need sealant?
In any case, BSP fittings are designed to be used dry, with no thread sealant. A specialized sealing washer known as a Dowty Seal (Pegasus Part No. 3240-Size) has been designed specifically for sealing BSP fittings.
What is BSP size?
British Standard Pipe Thread (BSPT)
|BSP Thread Size
|Outside Diameter mm / inch
|1/2 Inch BSP
|20.99 mm / 0.825″
|5/8 Inch BSP
|22.99 mm / 0.902″
|3/4 Inch BSP
|26.44 mm / 1.041″
|7/8 Inch BSP
|30.20 mm / 1.189″
What is the difference between BSP and NPT?
Both NPT and BSP are pipe thread standards for screw threads used on pipes and pipe fittings to seal pipes. With NPT, the peaks and valleys of the threads are flat. In BSP, they are rounded. Secondly, the NPT angle of the thread is 60 degrees and the BSP angle is 55 degrees.
How do I measure BSP threads?
To find the thread size:
- 1) Measure the O.D (outer diameter) of the BSP thread.
- 2) Take the O.D measurement (in inches) and subtract 1/4 inch (. 25”).
- 1) Multiply 3.5 by 4 to get 14. This is the number of threads per inch.
- 2) Combine the thread size with the number of threads per inch and refer to.
How do I know my BSP thread size?
How can you tell the difference between BSP and NPT?
Both threads have the same pitch and the familiar shaped peaks and valleys. With NPT, the peaks and valleys of the threads are flat. In BSP, they are rounded. Secondly, the NPT angle of the thread is 60 degrees and the BSP angle is 55 degrees.
How do I know if I have NPT thread?
To determine the size of a pipe, the outside diameter of each pipe or fitting must be measured and compared to the table for size identification. For example, a 3/4″ NPT pipe thread has an outside diameter of 1.050 inches. Each thread size has a defined number of threads per inch (TPI).
When to use CPVC or BSPT pipe fittings?
Connect to CPVC pipe for use in high-temperature plumbing and water supply applications up to 200° F. Use these plastic fittings to connect gasoline fuel lines to machines and equipment. They have excellent corrosion resistance as well as high strength and impact resistance.
What’s the thread flank angle of a BSPT pipe?
NOTE: It is a common mistake to identify a BSPT (tapered) as an NPT. Remember that NPT threads have a 60° thread flank angle, and BSPT has a 55° angle (this can be verified with a thread gauge).
How to find thread count for BSPT fittings?
You must find the I.D. to determine the threads per inch count for BSPT fittings. 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.
What are the threads of a British pipe fitting?
British Pipe Standard fittings are among the most popular of all foreign threads. These threads come in 2 versions: parallel (BSPP), and tapered (BSPT). The thread flank angle for both tapered and parallel British threads is 55°. NOTE: It is a common mistake to identify a BSPT (tapered) as an NPT.