In particular, the NPT thread angle is 60 degrees compared to the BSP 55-degree angle. BSPP is BRITISH STANDARD PIPE PARALLEL THREAD – Thread form per AS 1722 60° thread flank angle, and BSPT has a 55° angle (this can be verified with a thread gauge). P = Pitch, mm, or threads per inch (t. Pitch mm p. Here are the actual thread dimension data for BSPP and BSPT threads. To determine pitch, use a thread gauge or count the number of threads that fall into a 1 Unlike BSPT threads, BSPP threads do not feature a taper and rely on an additional sealing mechanism, such as an O-ring or gasket, to create a reliable seal. Often used in outdoor,damp, and washdown environments, these 316 stainless steel fittings will not corrode from water,salt, or chemicals. In other BSPT (British Standard Pipe Taper) is similar to NPT but there are a few important differences. The flank angles of the threads are also different between NPT and BSP. The male threaded ends mate with NPT,NPTF,BSPT,BSPP, and other universal threads, so you won’t have to worry about matching The common nominal sizes for smaller props are 1/8, 1/4, 3/8, and 1/2. It has Whitworth thread form (rounded peaks and valleys) with thread angle 55° and tapered thread 1°47′. Differences: • Each conforms to a different standard, British Standard BS 5200 or Japanese Industrial Standard JIS B8363. 73 (11/32") 1/4 0. Pitch Diameter. 728. p. Right for this last difference, it is good to choose the suitable thread in order not to cause any fluid leakages or faults under pressure. Class: 1A, 2A, 3A, 1B, 2B or 3B. β = The thread profile angle. The 1/16”, 1/8”, 1/4”, and 3/8” sizes have a dissimilar pitch, which causes a misalignment of the threads. NPT fittings will have threads with a 60 degree spread while BSP threads will have a 55 degree spread. BSPT (British Standard Pipe Taper) is similar to NPT except there are important differences. This is why it comes in Imperial sizes: 1/8, 1/4, 1/2, 3/4, etc. BSPP G 3/8 : Brith Pipe (BSP) Thread Dimensions and Tolerances. Connecting them together will therefore result in thread misalignment, damage and leaks. Threads per inch. G5 — O-Ring with Retaining Ring The standard defines the number of threads per inch (pitch) as well as the angle that each thread is engineered to. BSPT threads, standardized by the British Standard Pipe, are more common in Europe and Asia, featuring a 55-degree angle and a taper rate of 1 inch in 16. Fig. Sometimes BSPP threads are referred to as G threads and BSPT threads as R threads. BSPP threads are also known as female parallel threads and require a sealing washer to create a watertight connection. To determine pitch, use a thread gauge or count the This type of thread is also known as BSP parallel thread (cylindrical) or "Gas" thread (G). NPT/NPS threads have a 60° angle and have flattened valleys and peaks whereas BSP threads have a 55° angle and have rounded peaks and valleys. The end of a BSP thread is designed to sit on a seat (usually 30 degrees) and seal against it. The shape of the threads. 5° pitch angle. BSP threads have a 55° angle and have rounded peaks and valleys (Whitworth thread form) BSP is British Standard Pipe technical standards, it is divided into two types as male thread form into a BSP female straight thread form. Relevant Standards. The thread pitch is different in most cases, and the thread angle is 55 degrees instead of the 60-degree angle found on NPTF threads. All the relevant data for this tread in one spot BSPT is a British standard taper thread with 55 degree angle. Neither the British parallel pipe or the British tapered pipe has true metric threads, although many people find these threads "foreign" and The ThreaDoctor includes 4 sub-apps: Metric Thread Calculator, UN thread Calculator, NPT thread Calculator, and BSP thread calculator. This taper helps create a tight seal as British Standard Pipe BSP thread chart, BSP thread chart showing TPI and drill sizes. Aug 11, 2021 · BSP threads are rounded in the peaks and valleys and have a 55-degree thread angle; NPT threads are pointed in the peaks and valleys with a 60-degree thread angle; BSPP Parallel and BSPT Tapered Threads. The BSPP thread is a widely adopted thread in a number of countries around the world. Outside Diameter mm / inch. The second difference is the shape of the threads. With BSP, the peaks and valleys of the threads are rounded. BSPP. Diameter: From 1/4″ and above the diameters are given in inch fractions. Here are the actual thread dimension data for BSP threads. In some countries such as America, they will use TPI (threads per inch) which has the same underlying properties as 0. One of the most noticeable differences between NPT and BSPT threads is their shape and dimensions. Meanwhile, BSPT refers to tapered threads. Whereas NPT means 'National Pipe Thread', which is the American standard. 1. Table 4 summarizes NPT and BSP standards’ threads per inch. BSPT Rc 3/4. 1/16 Inch BSP. They’re straight and parallel, making them ideal for high-pressure and high-temperature applications. BSPP does not need any O-ring or bonded seal to form a seal. Order on line BSPT Taps, Rc Series "Rc: Series British Standard Pipe - Taper- BSPT. Unlike BSPP, BSPT creates a seal through the tightening of the threads, hence doesn’t require any O-ring or bonded seal. BSPT Rp 1/4 : Brith Pipe (BSP) Thread Dimensions and Tolerances. . 55 Degree Threads. It is used mostly in China, Korea, Japan. BSPT (British Standard Pipe Thread) is similar to NPT except there are important differences. Jul 26, 2023 · Understanding BSP Thread Gauges To make the most of BSP thread gauges, it’s essential to understand their key components: Thread Profile and Angle The BSP thread profile is based on a 55-degree angle, commonly known as the Whitworth thread form. Though it has been tried, problems always arise when trying to thread a NPT male form into a BSPP female form. e if 2. 5 BSPT thread nominal od is 2. The choice between class A and class B depends on the conditions of application. NPT/NPS and BSP threads are not compatible with each other due to the differences in their thread forms. SPG M-BSP. Major Diameter mm d=D. Universal-Thread Stainless Steel Push-to-Connect Tube Fittings for Air and Water. Tap Drill Diameter mm. 7 mm / 0. 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 May 20, 2020 · Whats the difference between BSP and NPT threads? BSP threads have a 55 o angle and rounded peaks and valleys, where as an NPT thread has a 60 o angle and flattened peaks and valleys, most sizes also have a different amount of threads per inch (TPI). QC Hydraulics has the capacity to produce all kinds of NPT and BSP thread fittings. Are BSP threads tapered? BSP threads can be either Parallel (BSPP) or Taper (BSPT). The thread flank angle for both tapered and parallel British threads is 55°. It is also known as the BSP (British Standard Pipe). Different thread standards have different thread angles; for example, the thread angle for NPT threads is 60 degrees. BSP Thread Size. SPG 0-10 BA BSPT R 3/8 : Brith Pipe (BSP) Thread Dimensions and Tolerances. " Ayn Rand, Atlas Shrugged. 8 BSPT threads are tapered and BSPP threads are straight (parallel). Metal to Metal Sealing. 1/8 Inch BSP. • Both have an undercut at the end of the threads near the hex. thanx again. G thread is with a 55°apex angle used on originally inch-based pipes. What is BSPT? BSPT, short for British Standard Pipe Tapered, is an internationally adopted tapered thread for interconnecting and sealing pipes. 3372 8. The angle between the taper and the center axis of the pipe is 1° 47'′ 24"″ (1. Feb 17, 2006 · thanx for the replys people, tho maybe i didnt explain myself correctly. Metric Threads Per ISO 68-1, ISO 261, and NPT/NPS threads have a 60° included angle and have flattened peaks and valleys (this is a Sellers thread form); BSP threads have a 55° included angle and have rounded peaks and valleys (this is a Whitworth thread form). NPT threads are separated at a 60 degree angle and have flattened peaks and valleys. SIZE: TPI: MAJOR (EXT) MINOR (INT) TAP DRILL: 1/8" 28: 9 NPT/NPS threads have a 60° angle and have flattened peaks and valleys (Sellers thread form) where as BSP threads have a 55° angle and have rounded peaks and valleys (Whitworth thread form). BSPT and NPT (National Pipe Thread) might seem similar, but there are Dec 7, 2023 · BSPT vs. That BSP/BSPT Thread Fitting. All the relevant data for this tread in one spot British Standard Whitworth ( BSW) is an imperial-unit -based screw thread standard, devised and specified by Joseph Whitworth in 1841 and later adopted as a British Standard. Types of BSP Threads: BSPP (Parallel): Also known as “G” or Gas threads, BSPP threads maintain a constant diameter. BSPT (R/Rp) – British Standard Tapered Pipe, for pipes and tapered thread. BSP parallel threads commonly seal via a 30° chamfer on the male thread to a 30° recessed Sep 8, 2023 · Understanding BSP Threads. 0357 28 0. Key Differences Between NPT and BSPT Threads. 6 1/8 0. NPT threads are pointed in the peaks and valleys, where BSPs are rounded. Matching Internal Parallel Thread. Thus an NPT male will sometimes fit into a BSPT fitting or vice versa but they will not seal. BSPP (G) – British Standard Pipe Parallel - see ISO 228 Pipe Threads where Pressure-tight Joints are not made on the Threads. Although BSP is a foreign thread, it isn’t actually metric. Pitch Diameter mm d2=D2. All the relevant data for this tread in one spot May 31, 2019 · RE: What is the angle of taper on BSPT Male Thread? A quick Google search reveals a taper of 3/4" per foot, or 1:16, which means the angle is 3. 383 0. BSP threads are cut at 55 degrees, while NPT are cut at 60 degrees. (At gauge plane) (d 2) 12. The BSP thread is offered in a straight (parallel) form known as BSPP and a tapered form known as BSPT. Figure 5 shows a male NPT tightened into a BSPP. UN – Constant pitch (##-UN) thread. BSPT R 1/2 : Brith Pipe (BSP) Thread Dimensions and Tolerances. For both of these threads, the flank angle is 55°. Below mentioned is a detailed description of these parameters: Thread angle: the thread angle of a BSPP thread is 55 degrees. BSPP threads follow a 55-degree included angle and are commonly used in applications that require a reliable seal, such as fuel lines, air compressors, and industrial equipment. Thread Crest and Root The crest is the topmost part of the thread, while the root is the Mar 10, 2023 · The NPT threads are sharp in peaks and valleys, where BSP threads are rounded. • Both use British Standard Pipe, Parallel (BSPP) thread. These threads feature a 55° flank angle. It was the world's first national screw thread standard, and is the basis for many other standards, such as BSF, BSP, BSCon, and BSCopper . systems. Yes, the G thread is essentially the same as BSPP. 0. BSP is divided into two types: British Standard Pipe Parallel (BSPP) and British Standard Pipe Tapered (BSPT). NPT and BSP thread pitches (threads per inch, TPI) are listed below. There are two types of BSP thread available: One is Parallel threads (BSPP) and the other type is Tapered Threads (BSPT) BSPT is BRITISH STANDARD PIPE TAPER THREAD – Thread form per AS 1722. 28. Whitworth shape is based on a thread with thread angle of 55 degrees, with Every thread, whether external (male) like a bolt or screw or internal (female) such as a nut, has a pitch and a diameter. Most notably, the NPT thread angle is 60 degrees versus the BSP 55-degree angle. They are Pitch is typically measured in threads per inch (TPI) 55° thread angle. 137329p where p is the pitch. i. BSPT Series. Dec 27, 2022 · BSP vs NPT. External Tapared (R) Matching Internal Tapered Thread. Oct 9, 2023 · On the other hand, BSPT or British Standard Pipe Taper, as the name suggests, features a tapered thread. The way to tell the difference between the two is the flank angle. All the relevant data for this tread in one spot. G1/8. The third difference is the cut angle of the thread. This tapering is typically at a 1:16 angle (or 55 degrees). The primary sealing mechanism of BSPT threads is through the wedging action of the threads as they are tightened, which creates a metal-to-metal seal. There are 2 types of BSP threads: BSPT (British Standard Pipe Thread) and BSPP (British Standard Parallel Pipe). A manual thread pitch gauge. The angle between the taper and the center axis of the pipe is tan−1(1⁄32) = 1. 2583 6. The majority of the pipe threads you will encounter on a British bikes will be the straight or parallel pipe threads. The cut angle of the thread. 7. Another important difference is that for many BSPT pipe sizes BSPT Rp 2 1/2 : Brith Pipe (BSP) Thread Dimensions and Tolerances. Standards are: BS EN 10226-1, JIS B0203, BS 21, DIN 2999. This unique profile sets BSP threads apart from other thread types, such as NPT (National Pipe Thread), which have a 60-degree thread angle. BSPP is sometimes referred to as “G” or Gas threads. UNF – Fine pitch thread. 1, BS 21, ISO 7. 640327p and a radius of 0. They both have a thread angle of 55°, BSPT is a tapered thread, whereas BSPP is a straight or parallel thread. 9495. This design creates a seal by means of a sharp “cutting face” at the base of the male thread that cuts into the flats or “spotface” surrounding the port when the fitting is threaded and tightened. Also, the thread angle in NPT is 60 0 unlike BSP’s 55 0 meaning the 2 threads have dissimilar pitches. All the relevant data for this tread in one spot The BSP to mm conversion chart below shows metric and imperial dimensions for male threads and the number of threads per inch (TPI) : British Standard Pipe Thread Size Chart. These threads maintain a consistent diameter, making them ideal for certain applications within plumbing and pipe Thread Designation BSPT. - The symbol for pipe thread type is G for external and internal threads. Pitch [mm] Major diameter of the thread. All the relevant data for this tread in one spot Pitch Diameter. United Inch Screw Threads Per ASME B1. The taper rate for all NPT threads is 1⁄16 (3⁄4 inch per foot) measured by the change of diameter (of the pipe thread) over distance. BSP threads have rounded valleys and troughs with a 55 degree pitch (this is known as Whitworth type). BSPP, represents the British Standard Pipe Parallel thread. All the relevant data for this tread in one spot BSPT threads are designed with a taper, meaning the diameter of the threads decreases gradually towards the end of the fitting. G5. 304 0. BSP-R designates a taper thread and BSP-G designates a parallel thread. BSP Thread: BSP threads have rounded crest and root, characterized by a 55-degree thread angle. There are several parameters that can be seen in a standard BSPP thread. There are two types of BSP threads; Tapered (BSPT) and parallel (BSPP). BSPP Threads: BSP, which stands for British Standard Pipe, which includes two varieties of threads: BSPP, which may be straight or parallel, and BSPT, which is a tapered thread. A BSP threads have a 55 degree flank angle, which is to say the angle of the “v” formed by two threads. ASK FOR OUR CATALOGUE. The main difference between the NPT threads and the BSP threads is in the coil angle of the threads - the NPT thread has a 60-degree coil angle and the BSP thread has a 55-degree coil angle. British Pipe Thread ( Whitworth Form) -- Taper (BSPT) Thread Designation BSPT: Nominal Size BSPT: Thread Form Type: Major Diameter mm d=D: Pitch mm p: Threads per Jun 25, 2024 · These threads have a 60-degree angle and taper at a rate of 1 inch in 16. The top surface joining the two sides, or flanks. and BS EN ISO 0228-1. the same 1 in 16 taper rate, the taper angle of these threads is also 3°34′47″, right? The Taper rate of tapered pipe threads is 1 in 16. BSPP thread Vs G thread. In NPT, they are flat and sharp. If you have a difficulty to find the correct - For external threads, two classes of tolerances on the pitch diameter are specified; these are Class A and Class B. UNC – Coarse pitch thread. 7899°). Common symbols used for the thread: BSPT, BSPTr, PT, KR, R, Rc. The pitch is the distance between each of the threads measured in either the imperial or metric system. Jul 15, 2023 · G thread. A pipe thread sealant is always required when making up tapered threads. NPT has a 60° thread where the BSP has a 55° thread. Both types have a thread pitch and an angle of 55 degrees. 4843. NPT threads have a 60° angle and have flattened peaks and valleys. ISO 7-1, ISO 7-2. British Standard Pipe Taper (BSPT) Threads Size Chart. Guide on how to properly measure threads. Taper: Tapered threads, like NPT and BSPT, have a gradual change in diameter over the length of the thread. The G-series screw thread may be internal screw thread or external screw thread; where the Rp-series screw thread is only • The seat angle is 60° for both styles. Characteristics of BSPT taper threads: tapered thread 1 o 47' truncation of roots and crests are rounded; 55 o thread angle; pitch is measured in threads Thread shape and dimensions. The primary difference between NPT and BSPT threads lies in their BSP threads, whether BSPP (British Standard Pipe Parallel) or BSPT (British Standard Pipe Taper), feature a Whitworth thread profile, which is defined by a 55-degree thread angle. The cylindrical thread to ISO 228-1 is a type of Whitworth thread, a name derived from the inventor of it and whose origins date back to England in the mid-nineteenth century. Gauge length [mm] Corresponding pipe. 9. BSPT Rc 1/4. Internal Parallel (Rp) Matching external Thread. BSP parallel threads commonly seal via a 30° chamfer on the male thread to a 30° recessed cone inside the female thread BSPT Rc 3/8 : Brith Pipe (BSP) Thread Dimensions and Tolerances. Usually marked: Rc size ISO. This is why it comes in imperial sizes: 1/8, 1/4, 1/2, 3/4, and so on. The differences between the G-series screw thread and the Rp-series screw thread include: The G-series screw thread is made to ISO-228 while the Rp-series screw thread is made to ISO-7 or BS-21 or EN 10226-1. UNEF – Ultra fine pitch thread. There are two types of BSP thread styles, BSPP parallel and BSPT tapered. The flank angle for NPT is 60° compared to the BSP tapered which is 55° (this can be verified with a thread gauge). Each “number” describes an arbitrary diameter as shown in the below table. BSPT R 1/8. 960" how do u work out the od of the small end of the taper at the start of thread. The major diameter is a bit larger smaller than the actual OD of the pipe, and the minor diameter should be very close to what you would measure inside the female BS taper threads are also referred to as British Standard Taper Pipe, Pipe Taper or Conical Thread. 518 0. BSPT Rc 1/2 : Brith Pipe (BSP) Thread Dimensions and Tolerances. - Designation: Internal thread - Pipe thread ISO 228- G 1/2 , External BRITISH STANDARD PIPE (BSP) THREADS Angle of Thread is 55 degrees ALL DIMENSIONS ARE IN INCHES (EXCEPT TAPPING DRILL) Threads Major Minor Diameter Pitch per Inch Diameter Diameter Tapping Drill (mm) 1/16 0. The thread pitch is different in most sizes, and the thread angle is 55° instead of 60° angle found on NPTF and NPSM threads. BA threads have 47. While NPT threads have a 60° thread angle with flat roots and peaks, BSP threads have a 55° thread angle with round roots and peaks. 304". Below 1/4″ the diameters are given by a series of numbers from #0 to #12. ISO tapered threads are equivalent to DIN 2999, BSPT, and JIS B0203. 301. BSPT Rp 1/8 : Brith Pipe (BSP) Thread Dimensions and Tolerances. The BSPT male has tapered threads and a 30-degree inverted seat. Sep 14, 2023 · BSP fittings have parallel threads, which means that the threads are of constant diameter and do not taper. The most common types of Whitworth pipe threads are. If you have any questions please contact us or check out our fittings with BSPP/ BSPT (G Apr 18, 2022 · NPT and BSP pipes are incompatible. Terminology BSPT Rc 1/4 : Brith Pipe (BSP) Thread Dimensions and Tolerances. NPT threads’ crests and roots are pointed compared to BSP’s rounded ones. All the fuel tanks and banjo bolts used BSPP. The thread is a standard Whitworth form with 55° angle with rounded crests and roots. BSPT Rc 1/8 : Brith Pipe (BSP) Thread Dimensions and Tolerances. As the name suggests, BSPP is used for parallel threads, while BSPT is used for tapered threads. 279. One of the rarer methods of sealing a fitting in port is Metal to Metal Sealing, also known as Cutting Face or Type B. For example 1/4″, 3/4″, 1 1/4″. Thread size. The BSPP thread has the same parallel straight as the G thread. The image from RYCO. The Whitworth thread specifies a 55° thread angle and a thread depth of 0. 7899° or 1° 47′ 24″. BSP threads have a 55° included angle and have rounded peaks and valleys (this is a Whitworth thread form). 9952. BSP means 'British Standard Pipe', which is the British standard. BSPT R 1/4. NOTE: It is a fairly common mistake to identify a BSPT (tapered) as an NPT. An appropriate sealing compound can be used in the thread to ensure a leakproof joint. All the relevant data for this tread in one spot Aug 27, 2019 · Both NPT and BSP are pipe thread standards for screw threads used on pipes and pipe fittings to seal pipes. Taper is 3/4" taper per foot ( 1 in 16 on the diameter) Various Symbols: BSPT, BSPTr, PT, KR, Rc. • Thread lengths are shorter on BS 5200 adapters. The angle between the flanks of the thread measured in an axial plane. NPT and BSP thread pitches (threads per inch) are listed below. All the relevant data for this tread in one spot Aug 6, 2019 · BSPT Connections. d3=D3. 1/8". Nov 28, 2019 · BSPT is a British standard taper thread with 55 degree angle. NPT and BSP threads are not interchangeable due to the differences in thread forms. All the relevant data for this tread in one spot The BSP thread is also known as the Whitworth 55° Thread Form. Combined Metric and BSP (7 leaves) BSP, BSPT, BSW, BSF & BSB threads have 55° pitch angle. It is fairly common for a tapered BSP thread to be mistaken for an NPT thread. Minor Diameter Male Thd. British Standard Pipe (BSP) threads are by far the most popular with the United Kingdom, all of Series: UNC / UNF / UNEF / UN. 4546 11. The pipe thread taper angle is double the inclination angle or 3°34′47″. The most common types of Whitworth thread are: BSPP (G) – British Standard Pipe Parallel. TPI. BSP threads are measured in imperial measurements such as 1/8, 1/4, 1/2, 3/4 etc. ) The distance from a point on the screw thread to a corresponding point on the next thread measured parallel to the axis. I know that the thread included angle is 55*, it is the 1 in 16 taper i dont understand i. 0526 19 0. 576 degrees. The BSP threads are similar to, but not interchangeable with American NPTF pipe threads. The major diameter is a bit smaller than the actual OD of the pipe, and the minor diameter should be very close BSPP refers to parallel or straight threads. Thread Angle: The thread angle is the angle between the flanks of the thread. Additionally, NPT threads are measured based on the internal diameter of the pipe, while BSPT threads are measured based on the British Standard Pipe Taper Thread (BSPT) has been adopted internationally as a standard scale used in plumbing fittings, and it is defined by BS EN 10226-1 and ISO 7-1. Use this chart to easily compare NPT and BSP. CAUTION - NOTE: ISO tapered threads are utilized in a similar way to NPT The current standard for these threads is BS 21 (taper threads) although this has been generally replaced by BS EN 10226-1. Differences. d3. Although BSP is a foreign thread, it isn’t actually metric. (At gauge plane) (d 2) 25. 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. 1 in 16 to diameter (3/4 in taper per foot) Angle of thread = 55 degrees. BSPT Rc 3/4 : Brith Pipe (BSP) Thread Dimensions and Tolerances. "Live and act within the limit of your knowledge and keep expanding it to the limit of your life. G vs. NPT threads have a 60-degree thread angle, while BSPT threads have a 55-degree angle. Threads per inch tpi. The two most common types of BSP threads are BSPP (British Standard Pipe Parallel) and BSPT (British Standard Pipe Taper). Always remember that NPT threads have a 60° thread flank angle, and BSPT has a 55° angle (this can be verified with a thread gauge). Fittings in this section with male BSPP threads use a primary sealing method of an O-ring and retaining ring, as shown in Fig. Thread Height H1. Also referred to as British Standard Taper Pipe or Pipe Taper, or Conical Thread. Nominal Size BSPT. Jan 23, 2024 · Also known as G or Rp (parallel) threads; BSPP threads have a 55-degree thread angle as well, but the threads maintain a constant diameter along the length of the fitting; Unlike BSP taper threads, BSPP threads do not create a sealing effect through tapering; BSPP fittings usually require the use of an additional sealing method, such as an O If you’re unsure which kind of fitting you’re working with, you’ll need a pitch gauge to measure the angles of the threads. Similar to BSPP, the thread angle is 55 degrees. Thread Form Type. pb eq rh df kh ly cp mf nm zu