We Super Steel Manufacturing Co.,Ltd(SMC) are amongst the top manufacturers and suppliers for the seamless steel pipe, welded steel pipe, OCTG products and fittings from China. We have been manufacturing and supplying these products to the industry since 1993, and received repeat orders and appreciation from our valued customers.
High quality piping products from approved manufacturers.
In order to continuously improve our offerings to our clients, we have consistently improved and upgraded our manufacturing facility and can hence offer material with stringent requirements.
Over the years, Super Steel Manufacturing Co.,Ltd(SMC) has developed an enviable reputation for project management for the Oil & Gas, Construction, Power Energy, Marine & Offshore, Water Treatment, Exploration & Drilling Services, Pipeline & Petrochemical and other heavy industries.
The many years of experience that we have means that there is always someone who has the ability to carry a project forward.
Always up to date. In this column you can find the steel pipe related articles, including industry trends, product standards and materials, and some technical guidelines.
introduction to pipe threads
npt (national pipe thread) and bspt (british standard pipe thread) are two commonly pipe thread standards. npt threads are commonly used in north america and bspt threads are more commonly used in europe and asia. both standards have tapered threads that create a tight seal when tightened together. widely used in water, gas, oil and other pipelines connection.
it is important to note that npt and bsp threads are not compatible with each other due to their different designs and measurement systems. adapters or fittings would be needed to connect npt and bsp threads.
the two main pipe thread standards are as follows:
| bsp thread chart | ||
| bsp nominal size | major diameter (od) | minor diameter (ld) |
| 1/8 | 0.38" | 0.34 |
| 1/4 | 0.52" | 0.45 |
| 3/8 | 0.65" | 0.59 |
| 1/2 | 0.83" | 0.73 |
| 3/4 | 1.04" | 0.95 |
| 1 | 1.30” | 1.19 |
| 11/4 | 1.65" | 1.53 |
| npt thread chart | |||
| npt nominal size | actual 0d | hand tight turns | wrench turns |
| 1/8 | 0.405" | 4.5 | 2.5 |
| 1/4 | 0.54” | 4 | 3 |
| 3/8 | 0.675" | 4.5 | 3 |
| 1/2 | 0.84" | 4.5 | 3 |
| 3/4 | 1.05" | 4.5 | 3 |
| 1 | 1.32" | 4.5 | 3.25 |
| 1 1/4 | 1.66" | 4.5 | 3.25 |
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