NPT Hydraulic Fitting Manufacturer in China

❖ NPT thread fittings

❖ Customized support

❖ Conforms to international standards

❖ High-quality

Product List

Topa has a martial of carbon steel, stainless steel, and brass for high-pressure applications. We have types not limited to NPT male, NPT female, NPT female to male, bushing, and NPT bulkhead fittings. At Topa, we pride ourselves on offering a comprehensive range of NPT hydraulic fittings to meet the diverse needs of our customers. Whether you require straight, elbow, tee, or coupling fittings, we provide high-quality products in various sizes, shapes, and materials to suit your specific applications. With our vast inventory, customizable options, and fast delivery, we are ready to support your hydraulic system requirements.

NPT Hydraulic Fittings Video

Discover the versatility and reliability of our NPT hydraulic fittings through this comprehensive video demonstration. This video showcases a wide variety of NPT fittings, including straight, elbow, tee, and coupling types, designed to meet the demands of different hydraulic systems. Each fitting is carefully manufactured with a tapered thread design to ensure a secure, leak-free seal, making them suitable for high-pressure and high-temperature applications across industries.

Take a closer look at the precision machining and high-quality standards that make our NPT hydraulic fittings stand out. From reliable sealing to customizable options, our fittings are engineered for efficiency and durability. Watch the video now to find the right solution for your system, and don’t hesitate to contact us for quotes, samples, or more information. Let us help you build a reliable and robust hydraulic system!

Application

These NPT hydraulic fittings are used for hose assemblies in hydraulic systems to carry water or oil. They are suitable for pumps, regulators, filters, aftermarket brake calipers, fuel systems, oil and coolant passages, intake manifolds, engine blocks, cylinder heads, gauges, etc.

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Features of Hydraulic NPT Fittings

NPT is National Pipe Taper Threads, This thread has been widely used for more than 100 years. NPT thread is ta aper thread, widely used in America. It is similar to the male BSPT fitting. NPT hydraulic fittings are American National Standard Pipe Threads that have tapered threads. It is the technical standard to measure tapered threads on pipes, tubes, or fittings in the United States.NPT threads are used to connect and seal fittings in low-pressure fluid and gas transfer applications. NPT hydraulic fitting seal by a metal-to-metal design, that hydraulic fitting threads itself are formed together. This design is ideal for single assembly applications, not for frequent assembly and disassembly of the hydraulic fittings.

Features

Hydraulic NPT fittings are an essential component in fluid and gas systems, offering a reliable, pressure-tight seal for a wide range of hydraulic applications. These fittings are commonly used in machinery, heavy equipment, and industrial systems due to their ease of installation and secure connection. The following are key features of Hydraulic NPT Fittings:

Tapered Threads: NPT fittings have a unique tapered thread design that allows for a self-sealing connection when tightened. The thread’s taper increases the pressure on the seal, which ensures a leak-free fit.

Material Variety: These fittings can be made from various materials such as stainless steel, brass, carbon steel, and more, depending on the specific application and required resistance to corrosion, high pressure, and temperature.

Customizable Sizes: NPT fittings come in a wide range of sizes, allowing flexibility in meeting the requirements of different hydraulic systems.

Thread Profile: The NPT thread has a 60-degree angle, which helps create the tight, secure seal needed for hydraulic systems. The combination of tapered threads and precise machining provides superior sealing performance.

Operating Principle

The operating principle of hydraulic NPT fittings relies on the tapered thread design. When two NPT fittings are screwed together, the threads’ taper increases the contact surface area and causes the threads to deform slightly, which results in a pressure-tight seal. Here’s how it works:

Sealing Action: As the male and female threads are tightened, the threads deform and create a tight seal against each other. This taper ensures that, as the fitting is torqued, the joint becomes progressively tighter, allowing the fitting to withstand higher pressures without leaking.

Sealing Compound: To enhance the sealing properties, hydraulic NPT fittings are often used with sealing compounds like Teflon tape or thread sealant paste, especially in high-pressure or high-temperature applications.

Application in Hydraulics: NPT fittings are primarily used in systems where fluids or gases are carried under high pressure, ensuring safe and efficient operation.

Advantages of NPT Fittings

Hydraulic NPT fittings are renowned for their exceptional sealing capabilities and versatility, making them a cornerstone in fluid and gas systems. Designed with a tapered thread structure, they ensure a reliable, leak-free connection that withstands high pressures, extreme temperatures, and demanding environments.

Self-Sealing Design

The tapered threads of NPT fittings allow them to form a tight, self-sealing connection when torqued, unlike straight-thread or compression fittings. As the threads tighten, they compress against each other, creating a pressure-tight seal without needing additional sealing materials.

Leak-Free Performance

The design of NPT fittings ensures that, when installed correctly, the system remains leak-free. This is crucial in hydraulic applications where leaks can lead to equipment failure, safety hazards, and fluid loss.

Versatile Material Compatibility

NPT fittings are compatible with a variety of materials beyond just steel and brass, including PTFE, PVC, nylon, bronze, and cast iron. This makes them suitable for use in different environments and applications, accommodating various fluid types and pressures.

Easy Installation

NPT fittings are relatively easy to install due to their tapered design, which allows for a secure connection as they are tightened. This ease of installation reduces the risk of human error during assembly and enhances system reliability.

Strong Mechanical Lock

The male and female threads of NPT fittings wedge tightly together, forming a robust mechanical lock that resists loosening under pressure or vibration. This strength ensures long-lasting, reliable connections even in demanding environments.

Wide Range of Sizes

NPT fittings are available in a wide range of sizes, allowing flexibility in fitting different hydraulic systems. This enables engineers and installers to find the right fitting for almost any application, from small equipment to large-scale industrial systems.

Types of Threads in NPT Fittings

NPT fittings are a cornerstone in fluid and gas systems, widely appreciated for their ability to provide secure, leak-proof connections. Different types of threads can be found in NPT fittings, each tailored to meet the specific requirements of various applications. These threads differ in design, sealing mechanisms, and functionality, making them versatile across industries such as hydraulics, plumbing, and gas distribution. Below is a detailed explanation of the most commonly used types of threads in NPT fittings:

Tapered Threads (NPT)

Description:

NPT fittings feature tapered male and female threads that compress against one another as they are tightened. This taper, with a standard angle of 1° 47′, ensures that the threads fit progressively tighter, forming a leak-proof connection through thread deformation. The taper’s design makes these threads especially effective in high-pressure applications.

Applications:

Tapered NPT threads are commonly used in hydraulic systems, plumbing installations, and gas pipelines. Their primary role is to provide a robust seal that can withstand the pressure of liquids or gases in motion. These fittings are suitable for systems requiring a dependable seal under dynamic pressure conditions.

Sealing:

Although the tapered design allows for a tight fit, the use of sealing materials such as Teflon tape or thread sealant is recommended to enhance the seal further. These materials fill microscopic gaps between the threads, providing added protection against leaks and improving corrosion resistance.

National Pipe Tapered Fuel (NPTF)

Description:

Also known as “Dryseal” threads, NPTF fittings are a more refined version of NPT threads. The key distinction lies in their precision; NPTF threads are engineered to deform more accurately during tightening, creating a seal without the need for additional sealing compounds. This feature makes them highly reliable in critical applications where contamination must be avoided.

Applications:

NPTF threads are widely used in fuel systems, hydraulic circuits, and other environments where the risk of contamination or leakage must be minimized. They are particularly advantageous in systems that handle sensitive fluids or require frequent disassembly and reassembly.

Sealing:

The dryseal design of NPTF threads eliminates the need for sealing materials such as tape or paste. By relying solely on thread deformation, these fittings provide a pressure-tight connection, making them ideal for clean environments where external sealants could compromise the system’s integrity.

National Pipe Straight (NPS)

Description:

Unlike tapered threads, NPS threads are straight and do not tighten into the material for sealing purposes. Instead, they are primarily used for mechanical connections where the threads hold the components together without forming a pressure-tight seal on their own.

Applications:

NPS threads are often paired with O-rings, gaskets, or other sealing elements to create a reliable seal in low-pressure systems. These threads are commonly found in structural assemblies, compressed air systems, and connections that do not require high-pressure sealing but prioritize mechanical strength.

Sealing:

NPS threads do not seal on the threads themselves. Instead, they rely on external sealing elements, such as gaskets or O-rings, to prevent leaks. This makes them more suitable for applications where thread deformation is unnecessary or undesirable.

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How to Install Hydraulic NPT Fittings

Installing hydraulic NPT fittings requires careful preparation and attention to detail to ensure a secure, leak-free connection. Proper installation is critical for the efficiency and reliability of hydraulic systems, especially when they operate under high pressures. By following the steps outlined below, you can achieve a successful installation and prevent common issues such as leaks, misalignment, or thread damage.

Gather the Required Tools and Materials

Before beginning, make sure you have the necessary tools and materials for the job. Using the right equipment will make the process smoother and reduce the chances of errors.

NPT Fittings: Select the appropriate male and female NPT fittings for your hydraulic system, ensuring they are the correct size and material for your application.

Pipe Wrench or Adjustable Wrench: These tools are essential for tightening the fittings securely.

Thread Sealant: Choose between Teflon tape or thread sealant paste, depending on your preference and the application requirements.

Cleaning Tools: Use a wire brush, cloth, or solvent to clean the threads and remove any dirt, old sealant, or debris that could interfere with the connection.

Pro Tip: Ensure the fittings match the system specifications and are compatible with the fluid type and operating pressure.

Clean the Threads

Cleaning the threads is a crucial step in the installation process. Dirty or damaged threads can prevent proper engagement, resulting in poor sealing or leaks.

Why It’s Important: Dirt, rust, or residual sealant can obstruct the threads, preventing a tight fit and compromising the seal.

How to Clean:

Use a wire brush or solvent to scrub the male and female threads thoroughly.

Wipe them down with a clean cloth to remove any remaining debris or moisture.

Inspect the threads for burrs, cracks, or other damage. Replace any fittings with visible defects.

Apply Thread Sealant

Thread sealant plays a vital role in preventing leaks by filling the gaps between the threads. Depending on the application, you can use either Teflon tape or thread sealant paste.

Using Teflon Tape:

Wrap the tape clockwise around the male threads (in the direction of tightening).

Start wrapping 1-2 threads back from the end to prevent the tape from blocking the pipe.

Apply 2-3 layers of tape evenly, ensuring complete coverage.

Using Thread Sealant Paste:

Apply a thin, even layer of paste over the male threads with a brush or your finger.

Be careful not to use excessive paste, as it can enter the pipe and cause clogs or contamination.

Tip: For hydraulic systems, make sure the sealant is compatible with the fluid being transported to avoid chemical reactions or degradation.

Hand-Tighten the Fitting

Begin the assembly process by threading the male fitting into the female fitting by hand.

How to Do It:

Insert the male fitting into the female fitting and turn it clockwise.

Ensure the threads align properly and the fitting screws in smoothly.

If resistance occurs early, stop, remove the fitting, and inspect the threads for dirt, misalignment, or damage.

Why It’s Important: Proper hand-tightening minimizes the risk of cross-threading and ensures a secure base for final tightening.

Tighten with a Wrench

After hand-tightening, use a pipe wrench or adjustable wrench to secure the connection further.

Steps:

Place the wrench on the fitting and turn it clockwise.

Tighten the fitting until resistance is felt, typically 1-2 full turns beyond hand-tight.

Avoid over-tightening, as this can damage the threads or deform the fitting.

Pro Tip: If you’re unsure about how much torque to apply, consult the manufacturer’s guidelines for specific torque values.

Check for Leaks

Once the fitting is installed, test the hydraulic system under operating pressure to check for leaks.

How to Test:

Gradually introduce fluid or gas into the system and bring it up to working pressure.

Inspect the connection for any signs of leakage.

What to Do If Leaks Are Found:

Depressurize the system and disassemble the connection.

Reapply thread sealant and reinstall the fitting, ensuring proper alignment and tightening.

Tip: Regularly inspect connections during system operation to catch any leaks early.

Ensure Proper Alignment

Alignment is critical for maintaining the integrity of the hydraulic system. Misaligned fittings can lead to stress on the threads, resulting in leaks or damage over time.

How to Align Properly:

Make sure the fitting is installed in a straight line with the connected pipe or hose.

Avoid bending or twisting the assembly during or after installation.

Why It Matters: Proper alignment reduces stress on the connection, extending the life of both the fitting and the system.

Tips for a Successful Installation

Avoid Over-Tightening: Over-tightening can strip threads or crack fittings, leading to leaks or system failure. Tighten only as much as necessary for a secure connection.

Use the Right Sealant: Select a thread sealant compatible with the hydraulic fluid and operating conditions to ensure long-term performance.

Inspect Before Use: Always inspect fittings and threads for burrs, rust, or damage before installation to prevent potential issues.

Lubrication: Applying a light lubricant can reduce friction during tightening, making it easier to achieve a secure connection.

Installing hydraulic NPT fittings requires attention to detail and proper technique to ensure a secure, leak-free connection. By cleaning the threads, applying the correct sealant, and avoiding common mistakes, you can achieve a reliable connection that supports your hydraulic system’s performance.

Ready to upgrade your hydraulic system?

Contact Topa today and we'll customize reliable, quality NPT fittings for you!

Choose Topa

More Than Just a Hydraulic Fittings Manufacturer

At Topa, we are dedicated to delivering high-quality hydraulic solutions tailored to your needs. Whether you need reliable NPT fittings, fast delivery from our vast inventory, or customizable products, Topa ensures precision, durability, and efficiency in every solution we provide. Partner with us to experience unparalleled excellence in hydraulic systems.

ISO, TUV, BV Approved

Topa is certified by ISO, TUV, and BV, ensuring our products meet the highest international standards. Trust us for reliable hydraulic fittings backed by global certifications.

Huge Stock, Fast Delivery

With a large inventory of hydraulic fittings, we can fulfill orders quickly to minimize your downtime. Our streamlined logistics ensure fast and efficient delivery worldwide.

100% Tested

Every product undergoes rigorous testing to guarantee performance and reliability. We ensure zero defects so you can trust our fittings in your hydraulic systems.

Small MOQ

We accommodate orders with small minimum order quantities, making it easy for businesses of all sizes to work with us. Start with a small batch and scale up as needed.

Free Samples

Request a free sample to evaluate our product quality and compatibility with your system. We’re confident you’ll see why Topa stands out as a reliable manufacturer.

Customizable Solutions

From material selection to size, shape, and branding, we offer tailored solutions to meet your exact specifications. Collaborate with us to create the perfect fittings for you.

Your Reliable NPT Hydraulic Fittings Manufacturer

At Topa, we are committed to being your trusted partner for high-quality hydraulic NPT fittings. As a professional manufacturer with decades of experience, we specialize in producing a wide range of hydraulic fittings designed to meet the most demanding industrial applications.

State-of-the-Art Manufacturing

With 5 advanced production lines and over 100 CNC machines, Topa delivers products with precision and consistency.

Customized Solutions

At Topa, we understand that every application is unique. That’s why we offer customizable NPT hydraulic fittings, allowing you to specify the size, material, and finish to suit your specific requirements.

Uncompromising Quality

Quality is at the heart of everything we do. Each NPT fitting undergoes rigorous testing to ensure it meets international standards for strength, corrosion resistance, and sealing performance.

Exceptional Service

Customer satisfaction is our priority. Our experienced team is here to provide technical support, assist with product selection, and ensure smooth logistics for your order.

FAQ

What is NPT hydraulic fittings?

NPT is National Pipe Taper, U.S. standard for tapered threads, widely used on pipes and fittings for over 100 years. NPT thread sealed forming metal to metal.

What is the difference between MPT and NPT hydraulic fittings?

MPT and FPT are both sub-types of NPT. MPT is male NPT and FPT is female NPT thread hydraulic fittings.

How do NPT threads work?

NPT hydraulic fittings is National Pipe Taper sealed by metal to metal sealing design, where the male and female thread form together.

Is JIC better than NPT hydraulic fittings ?

JIC fittings have a 37° flare angle, while NPT hydraulic fittings rely only on their tapered threads for sealing.JIC and NPT fittings are not to be mixed, they are subject to different pressures and have different sealing properties. NPT can be sealed by tightening the fitting.

Is SAE the same as NPT hydraulic fittings ?

The biggest difference is that SAE threads are straight threads and require additional O-rings, gaskets or sealing surfaces to create a seal; NPT threads are tapered threads and use their pitch to create a seal.

Is NPT measured by ID or OD?

NPT hydraulic fittings are listed by inside diameter (I.D.) The outside diameter (O.D.) of the thread is typically about 1/4 (0.250) in.

What's the difference between NPT hydraulic fittings and NPTF?

NPT (National Pipe Taper) is a general purpose tapered pipe thread and NPTF (National Pipe Taper Fuel) is a dry seal tapered pipe thread. NPT connections require thread sealant. NPTF connection creates a leak-proof seal without the use of a sealant

How tight should the NPT threads be?

Tight the NPT hydraulic fitting 2-3 full turns to the maximum size after hand tightening. You should have left 3.5 to 6 engaged threads.

How much pressure can NPT threads hold?

NPT type gauge fittings with a maximum working pressure of 15,000 psi (1050 bar).

Can you reuse NPT fittings?

Reusing NPT hydraulic fittings is not recommended. It can cause wear or increase the potential for leakage.

NPT Hydraulic Fitting Manufacturer in China

❖ NPT thread fittings

❖ Customized support

❖ Conforms to international standards

❖ High-quality

Product List

Reusable NPT Fitting

NPTF Hydraulic Fittings

NPT to ORFS Hydraulic Fitting

NPT to Flange Hydraulic Fitting

NPT to JIC Adapter

BSPP to NPT Adapter

NPT to Metric Adapter

NPT Male to Female Fitting

NPT Male Fitting

Female NPT Fitting

NPT Hydraulic Adapter

Tee and Cross

NPT Bend Hydraulic Fitting

NPT Brass Hydraulic Fitting

Garden Hose to NPT Adapter

NPT to Hose Barb Adapter

NPT Plug

SAE ORB to NPT Adapter

Bulkhead Fitting

Stainess Steel NPT Fitting

NPT Hose Fitting

NPT Hydraulic Fittings Video

Application

Transportation

Construction

Refuse and Waste

Get a Free Quote!

Don't wait, contact our team for a personalized quote and fast delivery to keep your business running smoothly!

Features of Hydraulic NPT Fittings

Features

Operating Principle

Advantages of NPT Fittings

Self-Sealing Design

Leak-Free Performance

Versatile Material Compatibility

Easy Installation

Strong Mechanical Lock

Wide Range of Sizes

Types of Threads in NPT Fittings

Tapered Threads (NPT)

National Pipe Tapered Fuel (NPTF)

National Pipe Straight (NPS)

Request a Free Sample Today!

Experience the precision and durability that sets Topa apart from the competition.

How to Install Hydraulic NPT Fittings

Table of Contents

Gather the Required Tools and Materials

Clean the Threads

Apply Thread Sealant

Hand-Tighten the Fitting

Tighten with a Wrench

Check for Leaks

Ensure Proper Alignment

Tips for a Successful Installation

Ready to upgrade your hydraulic system?

Contact Topa today and we'll customize reliable, quality NPT fittings for you!

More Than Just a Hydraulic Fittings Manufacturer

ISO, TUV, BV Approved

Huge Stock, Fast Delivery

100% Tested

Small MOQ

Free Samples

Customizable Solutions

Your Reliable NPT Hydraulic Fittings Manufacturer

FAQ

What is NPT hydraulic fittings?

What is the difference between MPT and NPT hydraulic fittings?

How do NPT threads work?

Is JIC better than NPT hydraulic fittings ?

Is SAE the same as NPT hydraulic fittings ?

Is NPT measured by ID or OD?

What's the difference between NPT hydraulic fittings and NPTF?

How tight should the NPT threads be?

How much pressure can NPT threads hold?