Table of content
Introduction
If you’re working with British or universal channeling frameworks, you’ve likely come over BSPP strings. BSPP stands for British Standard Parallel Pipe String, a standard string sort commonly found in water powered, pneumatic, and pipe associations. For starters, understanding the BSPP string measure chart is key to selecting the right components and guaranteeing leak-tight, congruous connections.
The BSPP string estimate chart appears the different pipe sizes, string pitches, exterior and interior distances across, and bore sizes for parallel pipe strings. Knowing these measurements makes a difference you discover the right fittings and guarantee that pipe components utilizing BSPP strings, which are commonly utilized in non-tapered string frameworks, will seal properly.
What Is BSPP Thread?
BSPP stands for British Standard Parallel Pipe String. Not at all like BSPT (British Standard Decreased Pipe String), BSPP strings keep up a consistent distance across along their length. The string does not seal with a wedge; instep, it depends on a gasket or O-ring, which is commonly utilized in level or flanged connections.
Where to use
BSPP strings are commonly found in the taking after areas:
– Pressure driven systems
– Pneumatic connections
– Low-pressure piping
– Worldwide hardware interfacing, particularly in Europe and Asia
They are exceptionally prevalent in applications where visit dismantling and reassembly are required and dependable, reusable seals are required.
BSPP Thread Dimensions Chart Overview
The following table lists some common BSPP sizes.
| Nominal Size | Threads Per Inch (TPI) | Major Diameter (mm) | Pitch (mm) | Drill Size (mm) |
| 1/8″ | 28 | 9.728 | 0.907 | 8.70 |
| 1/4″ | 19 | 13.157 | 1.337 | 11.60 |
| 3/8″ | 19 | 16.662 | 1.337 | 15.00 |
| 1/2″ | 14 | 20.955 | 1.814 | 18.90 |
| 3/4″ | 14 | 26.441 | 1.814 | 24.20 |
| 1″ | 11 | 33.249 | 2.309 | 30.20 |
| 1-1/4″ | 11 | 41.910 | 2.309 | 38.10 |
| 1-1/2″ | 11 | 47.803 | 2.309 | 43.90 |
| 2″ | 11 | 59.614 | 2.309 | 55.60 |
Key terms explained:
TPI: Number of threads: Number of peaks per English thread.
Major diameter: Diameter of external thread.
Drill size: Diameter of the tapered drill used for internal threading.
BSPP vs BSPT: What’s the Difference?
| Feature | BSPP (Parallel) | BSPT (Tapered) |
| Thread shape | Constant diameter | Decreasing diameter (tapered) |
| Seal method | Washer or O-ring | Thread wedging |
| Use case | Low-pressure, reusable | High-pressure, permanent |
| Interchange? | Not compatible | Not compatible |
Note: Do not confuse BSPP and BSPT. Because the sealing mechanisms of the two are different, the pressures they withstand are also different. Mixing them may easily cause failure or leakage.
How to Read and Use the Chart
To use the BSPP size chart:
- Measure the outside diameter of the male thread.
- Calculate the number of threads per inch (TPI).
- Compare these two numbers to the BSPP nominal size in the chart.
- If you need to machine female threads, confirm the correct drill size.
This process is important to ensure an accurate fit, especially in global manufacturing and hydraulic assembly.
Summary
The BSPP thread size chart is an important tool when selecting or making parallel pipe threads. These threads are popular for their reliability in repeatable low to medium pressure systems.
In critical applications, it is important to use a certified BSPP chart and thread gauge and never mistake BSPP for BSPT. With the right chart and understanding, you can build better, safer piping systems with international compatibility.
