Tapered pipe thread hydraulic connectors – BSPT and NPTF

Tapered pipe thread hydraulic connectors – BSPT and NPTF

Tapered pipe thread hydraulic connectors have an outside diameter that is cut on a cone.

This results in sides that are not parallel.

Two common types of tapered thread connectors are BSPT and NPTF.

BSPT British Standard Pipe Taper

Country of origin: Britain
Thread angle: 55 degrees (Whitworth)
Seat angle: 30 degrees

BSPT is a tapered thread. This means that the outside diameter of the thread is cut on a cone.

BSPT Thread - Not Parallel

The sides are not parallel.

The taper angle is a rise of 3/4″ for every 12″ in length.

This is approximately 1 degree, 47 minutes.

BSPT Thread - Angles

Male BSPT threads mate with female BSPT threads in adaptors.

BSPT female threads are also used in port applications.

BSPT Thread - Male-Female

As BSPT ports seal directly on the thread, the only machining required is drilling the hole and tapping the thread.

BSPT threads can also be used as a machined seat connector.

BSPT Thread - Nut

The thread used in the female swivel is parallel, BSPP.

This is so that the connector bottoms out onto the sealing face.

The female swivel is made as a two part assembly.

The majority of these connections use a crimped nut.

BSPT Thread - Nut

Larger sizes use a wire locked nut.

This increases the pressure capability of the connection.

BSPT Thread - Wire Lock

NPTF National Pipe Taper (Fuel)

Country of origin: USA
Thread angle: 60 degrees (ANSI)
Seat angle: 30 degrees

NPT is the standard American pipe thread.

NPTF is a derivative used in hydraulics. The “F” means that it is modified for fuel use.

NPTF Thread Diagram

NPTF threads have controlled truncation which means that the roots and crests of NPT threads fit more closely with their mating parts than most other threads.

For this reason, NPT threads feel “sharper” than their BSPT counterparts.

NPTF Thread Diagram

NPT threads are also used in port applications.

NPT port threads will look identical to BSPT ports, but it is important that NPT threads are not interchanged with BSP threads.

NPTF Thread Diagram

When NPT threads are used as machined seat fittings, a parallel female thread is used.

This is to ensure that the threads bottom out on the machined seat.

This thread is called NPSM, National Pipe, Straight Mechanical.

All RYCO NPT parts are extemally grooved or notched so that they can be easily identified.

NPTF Thread Nut

A notch results when a groove is machined in a hex.

Larger sizes use a wire locked nut.

NPTF Thread Wire Lock

This increases the pressure capability of the connection.

NPT threads are the preferred thread for very high pressure systems such as jacking systems.

Working Pressure 700 Bar – 10,000

Pipe threads are mechanically very strong because the thread length is generally twice as long as that of an equivalent sized thread such as JIC.

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The three types of hydraulic connectors and their two key functions

The three types of hydraulic connectors and their two key functions

This article is an overview of the theory of hydraulic connectors, the three main types of connectors and the two key functions that all hydraulic connectors must fulfil.

Three Main Types of Hydraulic Connectors

It provides basic information about the three main classes of hydraulic connectors:

  • Tapered Threads
  • Metal seal connectors
  • Soft seal connectors

Two Key Functions of Hydraulic Connectors

It’s important to understand that there are two functions that a hydraulic connector must fulfil:

  • Holding
  • Sealing

Sometimes the holding and sealing functions are provided by the same mechanism, and sometimes by two different parts.

Hose connectors may seem very confusing because of the many different types available.

However, when looking objectively, connectors will always simply do two things. Hold, and seal under pressure.

Development of Hydraulic Connectors

Hydraulic connectors were developed in this order:

  • Tapered threads
  • Metal seal connectors
  • Soft seal connectors

Tapered Threads

Tapered pipe threads were one of the first ways to connect pipes together.

They involve cutting the pipe thread in a tapered manner, so that the diameter of the pipe changes over the length of the fitting.

Tapered Pipe Thread

These kinds of connectors require some form of sealant, either a tape sealant, which can block the pipes, or a chemical sealant, which is preferred.

Tapered pipe threads can also be difficult to orient correctly, leading to poor sealing and leakage.

Tapered threads can also cause damage to other components, including deformation of aluminium and cracking of cast iron, due to the pressure of the steel pipe thread within the component.

They also can’t be connected to hydraulic tubes without soldering or welding of the tube to the part.

Metal Seal Connectors

Metal seal connectors were developed to address some of the limitations of the tapered pipe threads.

RYCO Threads BSPT BSPP NPT

A metal seal connector is basically a tapered pipe thread with the addition of a 30 degree machined face, to form a seal.

This feature is generally only in hydraulic systems, because of the high pressures that need to be dealt with.

The addition of the “chamfer” on the face of the thread split the holding and sealing features of the connector.

The thread does the holding and the machined face does the sealing.

This modification also makes the connector easier to orient, better sealing, and eliminates the need for a sealant.

However, metal seal connectors still can’t accept hydraulic tube unless the tube is soldered or welded to it, and they can also have issues with vibration.

The JIC connector is a further development. It has a 37º metal seal and can accept hydraulic hose and tube. BSP Thread, BSPT, BSPP and NPT are common types of threads used in metal seal connectors.

Soft Seal Connectors

Soft seal connectors are the most recent development in the evolution of hydraulic connectors.

They make use of an elastomeric seal – natural or synthetic – to prevent leakage.

Soft Seal Hydraulic Connector

The soft seal also helps connectors resist the effects of vibration, as well as the high-pressures used in many hydraulic systems today.

The seal in a soft seal connector usually takes the form of an O-ring.

Another advantage of soft seal connectors is their rapid assembly, which can be important in high-volume production environments.

The main limitation of soft seal connectors comes from the fact that performance of the o-ring can be affected by temperature and the system fluids, if they’re not compatible with the elastic substance.

Want More Information?

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