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Velvet Digest

Can you use Bspt with BSPP?

Author

Emily Wilson

Updated on April 27, 2026

The BSPT (tapered) male will mate with a BSPT (tapered) female, or a BSPP (parallel) female. The BSPT male has tapered threads. The BSPT connector is similar to, but not interchangeable with, the NPTF connector.

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Likewise, people ask, what is the difference between BSPP and BSPT?

BSPP is parallel thread/whitworth, BSPT, R and RC is taper thread, but RC is female BSPT thread. BSPP and BSPT (in most cases) have different threads per inch (TPI) (and consequently pitch). The male BSPT taper thread will mate with a female BSPT or BSPP thread, so this situation BSPT can fit BSPP.

Furthermore, what does BSPP thread mean? British Standard Pipe Parallel thread

Regarding this, is BSPP compatible with NPT?

BSPT equivalent is NPT and BSPP's equivalent is NPS. Never swap threads if it is a high pressure application. NPT/NPS and BSP threads are not compatible due to the differences in their thread forms, and not just the fact that most sizes have a different pitch.

How do I seal BSPP threads?

BSPT male threads seal against threads of fixed BSPT female. Contact is made on the flanks of the threads. Use of a thread sealant is recommended for BSPT male to BSPT female connections. Measure the BSPT male thread OD and female thread ID at the first full thread near the end of the fitting.

Related Question Answers

How is Bspt measured?

To find the thread size:
  1. 1) Measure the O.D (outer diameter) of the BSP thread.
  2. 2) Take the O.D measurement (in inches) and subtract 1/4 inch (. 25”).
  3. 1) Multiply 3.5 by 4 to get 14. This is the number of threads per inch.
  4. 2) Combine the thread size with the number of threads per inch and refer to.

Is BSP tapered or parallel?

Both Taper and Parallel male threads can be fitted to parallel female threads but only taper male threads can be fitted to taper female threads. A Parallel male thread will NOT fit a taper female thread. Which to Use? Most BSP female threads are parallel.

What is G thread?

BSP distinguishes between two types of threads. These are parallel threads (BSPP), which have a constant diameter, which are known a G threads, and taper threads (BSPT), whose diameter increases or decreases along the length of the thread, known as R threads.

Are BSP and G threads the same?

First of all, BSP and G, the two are not the same thing. Common such as BSPF (British Standard Fitting), BSPM (British Standard Pipe Mechanical) and PS (British Standard Pipe Straight), etc.. However, with the later ISO standard, these eight kind of Wuhua call all replaced with a simple letter. This is the G thread.

Do NPT threads need sealant?

NPT threads are designed to be used with a sealing compound such as Teflon tape to create a leak-free seal, whereas NPTF threads form a mechanical seal by crushing the entire thread form. If NPT is used without a sealing compound then there can be leakages or other unpleasant issues.

Is NPT tapered?

NPT stands for National Pipe Tapered threads, also known as ANSI/ASME B1. 20.1 pipe threads. It is a U.S. standard for measuring tapered threads on threaded pipes and fittings. Sometimes referred to as MPT (male pipe threads), NPT threads are not interchangeable with NPS (National Pipe Straight) threads.

What is the difference between NPT and BSPT?

The difference between NPT vs. 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 can you tell the difference between BSPT and NPT?

BSPT Connections 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. Another important difference is that for many BSPT pipe sizes the thread pitch is different than NPT.

Is G thread compatible with NPT?

NPS thread –National Pipe Straight- is not interchangeable with NPT thread. The most common types of whitworth thread are: BSPP (G) – British Standard Pipe Parallel • BSPT (R/Rp) – British Standard Tapered Pipe, for pipes and tapered thread. - Female thread can also be tapered: Rc, but this is not common.

What does NPT mean in plumbing?

National Pipe Tapered thread

How do you seal parallel pipe threads?

For a parallel thread in port application, the fitting will usually seal at the top of the thread by means of an O-ring or seal. With a tapered thread, the fitting typically seals via metal-to-metal wedging of the threads.

Is IPS the same as NPT?

According to the Googles, IPS is Iron Pipe Straight thread. NPT is a tapered thread, designed to seal on the threads, which is why you put pipe tape on them - to lubricate them and help the threads deform and create a seal.

Are female NPT threads tapered?

NPT has a tapered male and female thread which seals with Teflon tape or jointing compound. Jointing threads are pipe threads for joints made pressure tight by sealing on the threads and are taper external and parallel or taper internal threads.

Are NPT and NPS threads compatible?

Both NPT and NPS have the same thread angle, shape, and pitch (threads per inch). Thread sealant or tape is typically required to complete the seal. Straight Pipe Threads need a gasket or O-ring to create a seal. While NPT and NPS threads will engage, they do not seal properly with each other.

What is SAE thread?

Those terms apply to SAE ("standard" or "American") hardware. For instance, a ¼” bolt comes in either ½-20, which is “SAE standard coarse," or ¼-24, which is “SAE standard fine." The -20 and -24 represents how many THREADS PER INCH (thread pitch) are present on the fastener.

Is there a metric pipe thread?

In Europe Metric (DIN) pipe threads are common on German machines. These generally have a 1.5mm thread pitch, although this can vary. Smaller sizes can be 1.0mm thread pitch, and larger sizes can be 2.0mm thread pitch.

What is a g1 8 thread?

In the case of a thread size 1/8", for example, the threads are specified as G1/8 or R1/8. The following rules must be adhered to when using a combination of G and R-threads: Male G-threads (cylindrical) can only be screwed into female G-threads. Male R-threads (conical) can be screwed into female G or R-threads.

What is g1 4 fitting?

G1/4 BSP (British Standard Pipe) is a pipe thread specification. Almost every watercooling component has the G1/4 thread. The 3/8" means the diameter of the fitting. It is important for choosing the tubes that have the same inner diameter or ID. And yes, your fitting will fit G1/4 thread.

Is Whitworth thread the same as UNC?

British Standard Whitworth (BSW) It turns out that, except for 1/2" (where the British use 12 threads per inch (tpi) and Americans use 13 tpi) the thread pitches for the rest are the same as for American Unified Coarse (UNC). However, the thread form is different; Whitworth = 55 degrees; UNC = 60 degrees.