What are BSP sizes?
What are BSP thread sizes?
| BSP Size | Also Known As | Actual Diameter (Metric) |
|---|---|---|
| 1/8″ | 9mm | |
| 1/4″ | 12mm | |
| 3/8″ | 15mm | |
| 1/2″ | 15 BSP | 19mm |
What are BSP 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?
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. You can do this by counting the number of thread crests over a 1/4″ length and then multiply this by 4 to get the number of threads per inch.
How do you identify the size of a BSP threaded fitting?
The easiest way is to count the thread crests over a shorter length, say 1/4″, and simply multiply it by 4. For example, if you count 3.5 thread crests over 1/4″: 3.5 x 4 = 14 threads per inch. Take this measurement and cross-reference it to your thread size in the chart below.
Is BSP tapered?
The BSPT male has tapered threads and a 30-degree inverted seat. 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.
Does NPT fit BSP?
NPT and BSP threads are generally not compatible due to the differences in their thread forms. NPT 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).
What angle is BSP thread?
55°
BSP standards call for a thread angle of 55°.
How do I know if I am NPT or BSP?
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 you know if a thread is BSP or NPT?
NPT and BSP threads are not interchangeable due to the differences in thread forms. NPT threads are pointed in the peaks and valleys, where BSPs are rounded. Most notably, the NPT thread angle is 60 degrees versus the BSP 55-degree angle.
What is the outside diameter of 1/4 BSP thread?
13.16 mm
British Standard Pipe Thread (BSPT)
| BSP Thread Size | Outside Diameter mm / inch | TPI |
|---|---|---|
| 1/4 Inch BSP | 13.16 mm / 0.518″ | 19 |
| 3/8 Inch BSP | 16.66 mm / 0.656″ | 19 |
| 1/2 Inch BSP | 20.99 mm / 0.825″ | 14 |
| 5/8 Inch BSP | 22.99 mm / 0.902″ | 14 |
Is pipe diameter inside or outside?
In short: Tube is measured by outside diameter, pipe is measured by inside diameter. There is often confusion as to which size die the customer actually needs – Pipe Size or Tubing Size. Keep in mind that pipe size refers to a nominal – not actual – inside pipe diameter. Schedule refers to the pipe’s wall thickness.
How to measure BSP fittings?
Determine BSPP thread or BSPT thread,by visual inspection for parallel or tapered thread.
How to identify BSP threads?
thread size of 3/4, also known as “dash” 12. 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. You can do this by counting the number of thread crests over a 1/4” length, then multiply it by 4 to get the number of threads/inch.
Where to buy BSP fittings?
Try Fastenal, a Parker store, commercial pneumatic houses, H. H. Barnum in Brighton, ask for Tony Ford, they are an SMC distributor. There’s a parker store on Ellsworth just past stone school.
Where to find BSPT fittings?
Iron and Steel Threaded Pipe and Pipe Fittings. Use these fittings for low-pressure applications in noncorrosive environments.